Physics MCQ
Take your physics knowledge to the next level with these multiple-choice questions. Test yourself and improve your understanding of physics concepts
Physics question and answer for exam are crucial for students preparing for competitive exams. MCQs or multiple-choice questions are an effective way to test a student's understanding of a subject. In physics, MCQs can cover a wide range of topics, from basic concepts such as motion and energy to complex theories like relativity and quantum mechanics. Physics question and answer for exam can help students assess their knowledge and identify areas they need to focus on before the exam.
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MCQ Started
1. Which of the following is not a type of simple machine?
a) Lever
b) Inclined plane
c) Pulley
d) Thermometer
Answer: d) Thermometer
Explanation: A thermometer is not a type of simple machine. Simple machines are basic mechanical devices that can be used to make work easier, and they include levers, inclined planes, pulleys, wheels and axles, screws, and wedges.
2. What is the formula for calculating kinetic energy?
Answer: KE = 0.5 * m * v^2
Explanation: The formula for calculating kinetic energy is KE = 0.5 * m * v^2, where KE is kinetic energy, m is the mass of the object in motion, and v is the velocity of the object.
3. What is the force that opposes motion between two surfaces in contact?
a) Gravitational force
b) Frictional force
c) Electrostatic force
d) Magnetic force
Answer: b) Frictional force
Explanation: Frictional force is the force that opposes motion between two surfaces in contact. It is caused by the microscopic roughness of the surfaces, which creates interlocking "bumps" that resist motion.
4. What is the formula for calculating work done?
Answer: W = F * d * cos(theta)
Explanation: The formula for calculating work done is W = F * d * cos(theta), where W is work done, F is the force applied, d is the distance over which the force is applied, and theta is the angle between the force and the direction of motion.
5. What is the SI unit of force?
Answer: Newton
Explanation: The SI unit of force is the newton (N), named after Sir Isaac Newton. One newton is defined as the force required to accelerate a mass of one kilogram at a rate of one meter per second squared.
6. Which law of motion states that for every action, there is an equal and opposite reaction?
Answer: Newton's third law of motion
Explanation: Newton's third law of motion states that for every action, there is an equal and opposite reaction. This means that whenever one object exerts a force on another object, the second object exerts an equal and opposite force back on the first object.
7. What is the formula for calculating power?
Answer: P = W/t
Explanation: The formula for calculating power is P = W/t, where P is power, W is work done, and t is time. Power is a measure of how quickly work is done or energy is transferred.
8. What is the formula for calculating electric potential energy?
Answer: PE = q * V
Explanation: The formula for calculating electric potential energy is PE = q * V, where PE is electric potential energy, q is the charge on the object, and V is the potential difference between two points.
9. What is the formula for calculating acceleration?
Answer: a = (v_f - v_i) / t
Explanation: The formula for calculating acceleration is a = (v_f - v_i) / t, where a is acceleration, v_f is the final velocity, v_i is the initial velocity, and t is the time taken for the change in velocity.
10. Which law of motion states that the rate of change of momentum of an object is directly proportional to the force applied, and occurs in the direction in which the force is applied?
Answer: Newton's second law of motion
Explanation: Newton's second law of motion states that the rate of change of momentum of an object is directly proportional to the force applied, and occurs in the direction in which the force is applied
11. Which law of thermodynamics states that energy cannot be created or destroyed, only converted from one form to another?
a) First law
b) Second law
c) Third law
d) Fourth law
Answer: a) First law
Explanation: The first law of thermodynamics, also known as the law of conservation of energy, states that energy cannot be created or destroyed, only converted from one form to another. This means that the total amount of energy in a closed system remains constant.
12. What is the formula for calculating electric current?
Answer: I = Q/t
Explanation: The formula for calculating electric current is I = Q/t, where I is electric current, Q is charge, and t is time. Electric current is the rate of flow of electric charge through a conductor.
13. What is the force that causes an object to move in a circular path?
a) Gravitational force
b) Frictional force
c) Centripetal force
d) Centrifugal force
Answer: c) Centripetal force
Explanation: Centripetal force is the force that causes an object to move in a circular path. It acts perpendicular to the velocity of the object and is directed towards the center of the circle.
14. What is the formula for calculating density?
Answer: density = mass/volume
Explanation: The formula for calculating density is density = mass/volume, where density is the mass per unit volume of a substance.
15. Which type of wave is characterized by oscillations perpendicular to the direction of wave propagation?
a) Transverse wave
b) Longitudinal wave
c) Surface wave
d) Electromagnetic wave
Answer: a) Transverse wave
Explanation: Transverse waves are characterized by oscillations perpendicular to the direction of wave propagation. They include waves on a string and electromagnetic waves.
16. What is the formula for calculating pressure?
Answer: pressure = force/area
Explanation: The formula for calculating pressure is pressure = force/area, where pressure is the force per unit area.
17. Which law of thermodynamics states that the entropy of an isolated system always increases over time?
a) First law
b) Second law
c) Third law
d) Fourth law
Answer: b) Second law
Explanation: The second law of thermodynamics states that the entropy of an isolated system always increases over time. Entropy is a measure of the disorder or randomness in a system.
18. What is the formula for calculating voltage?
Answer: voltage = work done/charge
Explanation: The formula for calculating voltage is voltage = work done/charge, where voltage is the potential difference between two points, work done is the energy transferred between the points, and charge is the amount of electric charge involved.
19. Which type of energy is stored in an object due to its position or height above the ground?
a) Kinetic energy
b) Thermal energy
c) Electrical energy
d) Potential energy
Answer: d) Potential energy
Explanation: Potential energy is the energy stored in an object due to its position or height above the ground. It is a form of stored energy that can be released and converted into other forms of energy.
20. What is the formula for calculating force?
Answer: force = mass * acceleration
Explanation: The formula for calculating force is force = mass * acceleration, where force is the product of mass and acceleration. This is known as Newton's second law of motion.
21. Which law of thermodynamics states that it is impossible to reach absolute zero temperature?
a) First law
b) Second law
c) Third law
d) Fourth law
Answer: c) Third law
Explanation: The third law of thermodynamics states that it is impossible to reach absolute zero temperature. Absolute zero is the lowest possible temperature, at which all substances have zero entropy.
22. What is the SI unit of electric charge?
a) Coulomb
b) Ampere
c) Volt
d) Ohm
Answer: a) Coulomb
Explanation: The SI unit of electric charge is the coulomb, which is defined as the amount of charge that passes through a conductor in one second when a current of one ampere is flowing.
23. What is the force that opposes motion between two surfaces in contact?
a) Gravitational force
b) Frictional force
c) Centripetal force
d) Electromagnetic force
Answer: b) Frictional force
Explanation: Frictional force is the force that opposes motion between two surfaces in contact. It is caused by the interaction between the surface atoms and molecules.
24. What is the formula for calculating work done?
Answer: work done = force * distance
Explanation: The formula for calculating work done is work done = force * distance, where work done is the energy transferred when a force acts on an object and moves it over a distance.
25. Which type of wave is characterized by oscillations parallel to the direction of wave propagation?
a) Transverse wave
b) Longitudinal wave
c) Surface wave
d) Electromagnetic wave
Answer: b) Longitudinal wave
Explanation: Longitudinal waves are characterized by oscillations parallel to the direction of wave propagation. They include sound waves and seismic waves.
26. What is the formula for calculating power?
Answer: power = work done/time
Explanation: The formula for calculating power is power = work done/time, where power is the rate at which work is done, work done is the energy transferred, and time is the duration over which the work is done.
27. Which law of motion states that every action has an equal and opposite reaction?
a) First law
b) Second law
c) Third law
d) Fourth law
Answer: c) Third law
Explanation: Newton's third law of motion states that every action has an equal and opposite reaction. This means that when one object exerts a force on another object, the second object exerts an equal and opposite force on the first object.
Physics MCQ
28. What is the formula for calculating acceleration?
Answer: acceleration = change in velocity/time taken
Explanation: The formula for calculating acceleration is acceleration = change in velocity/time taken, where acceleration is the rate at which velocity changes, change in velocity is the final velocity minus the initial velocity, and time taken is the duration over which the velocity changes.
29. Which type of energy is associated with the motion of particles or objects?
a) Kinetic energy
b) Thermal energy
c) Electrical energy
d) Potential energy
Answer: a) Kinetic energy
Explanation: Kinetic energy is the energy associated with the motion of particles or objects. It depends on the mass and velocity of the particles or objects.
30. What is the formula for calculating momentum?
Answer: momentum = mass * velocity
Explanation: The formula for calculating momentum is momentum = mass * velocity, where momentum is the product of mass and velocity. This is known as the law of conservation of momentum.
31. What is the unit of frequency?
a) Hertz
b) Newton
c) Joule
d) Watt
Answer: a) Hertz
Explanation: The unit of frequency is the hertz (Hz), which is defined as one cycle per second.
32. Which law of motion states that an object at rest will remain at rest, and an object in motion will remain in motion with a constant velocity unless acted upon by an external force?
a) First law
b) Second law
c) Third law
d) Fourth law
Answer: a) First law
Explanation: Newton's first law of motion, also known as the law of inertia, states that an object at rest will remain at rest, and an object in motion will remain in motion with a constant velocity unless acted upon by an external force.
33. What is the SI unit of pressure?
a) Pascal
b) Newton
c) Joule
d) Watt
Answer: a) Pascal
Explanation: The SI unit of pressure is the pascal (Pa), which is defined as one newton per square meter.
34. What is the formula for calculating force?
Answer: force = mass * acceleration
Explanation: The formula for calculating force is force = mass * acceleration, where force is the product of mass and acceleration.
35. Which type of lens converges light rays to a point?
a) Convex lens
b) Concave lens
c) Plano-convex lens
d) Plano-concave lens
Answer: a) Convex lens
Explanation: A convex lens converges light rays to a point. It is also known as a converging lens.
36. What is the formula for calculating pressure?
Answer: pressure = force/area
Explanation: The formula for calculating pressure is pressure = force/area, where pressure is the force exerted per unit area.
37. What is the force that causes an object to move in a circular path?
a) Gravitational force
b) Frictional force
c) Centripetal force
d) Electromagnetic force
Answer: c) Centripetal force
Explanation: Centripetal force is the force that causes an object to move in a circular path. It is directed towards the center of the circle.
38. What is the formula for calculating density?
Answer: density = mass/volume
Explanation: The formula for calculating density is density = mass/volume, where density is the mass per unit volume.
39. Which type of wave is characterized by oscillations perpendicular to the direction of wave propagation?
a) Transverse wave
b) Longitudinal wave
c) Surface wave
d) Electromagnetic wave
Answer: a) Transverse wave
Explanation: Transverse waves are characterized by oscillations perpendicular to the direction of wave propagation. They include light waves and electromagnetic waves.
40. What is the formula for calculating velocity?
Answer: velocity = distance/time
Explanation: The formula for calculating velocity is velocity = distance/time, where velocity is the rate at which distance is covered, distance is the length of the path covered, and time is the duration of the journey.
41, Which type of energy is stored in an object due to its position or height above the ground?
a) Kinetic energy
b) Potential energy
c) Thermal energy
d) Chemical energy
Answer: b) Potential energy
Explanation: Potential energy is the energy stored in an object due to its position or height above the ground. It is a form of stored energy that can be converted into other forms of energy, such as kinetic energy.
42. What is the law of conservation of energy?
a) Energy cannot be created or destroyed, only converted from one form to another
b) The total momentum of an isolated system is conserved
c) For every action, there is an equal and opposite reaction
d) The amount of work done is equal to the change in kinetic energy
Answer: a) Energy cannot be created or destroyed, only converted from one form to another
Explanation: The law of conservation of energy states that energy cannot be created or destroyed, only converted from one form to another. This means that the total energy of a system remains constant over time.
43. Which type of energy is associated with the motion of an object?
a) Kinetic energy
b) Potential energy
c) Thermal energy
d) Chemical energy
Answer: a) Kinetic energy
Explanation: Kinetic energy is the energy associated with the motion of an object. The faster an object moves, the more kinetic energy it has.
44. What is the formula for calculating power?
Answer: power = work/time
Explanation: The formula for calculating power is power = work/time, where power is the rate at which work is done, work is the product of force and displacement, and time is the duration of the work.
45. Which type of circuit has only one path for the flow of current?
a) Parallel circuit
b) Series circuit
c) Combination circuit
d) Complex circuit
Answer: b) Series circuit
Explanation: A series circuit has only one path for the flow of current. The components in a series circuit are connected end to end, and the current flows through each component in turn.
46. What is the unit of power?
a) Joule
b) Newton
c) Watt
d) Ampere
Answer: c) Watt
Explanation: The unit of power is the watt (W), which is defined as one joule per second.
47. What is the formula for calculating work?
Answer: work = force * distance * cos(theta)
Explanation: The formula for calculating work is work = force * distance * cos(theta), where work is the product of force, displacement, and the cosine of the angle between force and displacement.
48. Which law of thermodynamics states that energy cannot be converted from heat to work without a decrease in the total amount of energy in the system?
a) First law
b) Second law
c) Third law
d) Fourth law
Answer: b) Second law
Explanation: The second law of thermodynamics states that energy cannot be converted from heat to work without a decrease in the total amount of energy in the system. This is due to the fact that some energy is always lost as heat during any energy conversion process.
49. What is the formula for calculating electric power?
Answer: electric power = current * voltage
Explanation: The formula for calculating electric power is electric power = current * voltage, where electric power is the rate at which electrical energy is transferred, current is the flow of electric charge, and voltage is the potential difference between two points.
50. Which law of motion states that every action has an equal and opposite reaction?
a) First law
b) Second law
c) Third law
d) Fourth law
Answer: c) Third law
Explanation: The third law of motion, also known as Newton's third law, states that every action has an equal and opposite reaction. This means that if one object exerts a force on another object, the second object will exert an equal and opposite force back on the first object.
51. Which type of lens can converge a beam of light?
a) Convex lens
b) Concave lens
c) Both convex and concave lenses
d) Neither convex nor concave lenses
Answer: a) Convex lens
Explanation: A convex lens is a type of lens that is thicker at the center than at the edges. This shape causes the lens to converge a beam of light, bringing the rays together to a focal point.
52. What is the relationship between wavelength and frequency of a wave?
a) Directly proportional
b) Inversely proportional
c) No relationship
d) Cannot be determined
Answer: b) Inversely proportional
Explanation: The wavelength and frequency of a wave are inversely proportional. This means that as the wavelength of a wave increases, its frequency decreases, and vice versa.
53. Which type of electromagnetic wave has the shortest wavelength?
a) Radio waves
b) Microwaves
c) X-rays
d) Gamma rays
Answer: d) Gamma rays
Explanation: Gamma rays are a type of electromagnetic wave with the shortest wavelength and highest frequency. They have wavelengths shorter than X-rays and are often produced by nuclear reactions.
54. What is the unit of force?
a) Joule
b) Newton
c) Watt
d) Ampere
Answer: b) Newton
Explanation: The unit of force is the newton (N), which is defined as the amount of force needed to accelerate a 1-kilogram mass at a rate of 1 meter per second squared.
55. What is the formula for calculating force?
Answer: force = mass * acceleration
Explanation: The formula for calculating force is force = mass * acceleration, where force is the product of mass and acceleration.
56. Which type of energy is associated with the vibration of particles in a medium?
a) Kinetic energy
b) Potential energy
c) Thermal energy
d) Sound energy
Answer: d) Sound energy
Explanation: Sound energy is the energy associated with the vibration of particles in a medium, such as air or water. It is a type of kinetic energy that is transferred through the medium as a wave.
57. Which type of energy is associated with the movement of electrons in a circuit?
a) Kinetic energy
b) Potential energy
c) Thermal energy
d) Electrical energy
Answer: d) Electrical energy
Explanation: Electrical energy is the energy associated with the movement of electrons in a circuit. It is a type of potential energy that can be converted into other forms of energy, such as light or heat.
58. Which type of lens can diverge a beam of light?
a) Convex lens
b) Concave lens
c) Both convex and concave lenses
d) Neither convex nor concave lenses
Answer: b) Concave lens
Explanation: A concave lens is a type of lens that is thinner at the center than at the edges. This shape causes the lens to diverge a beam of light, spreading out the rays as they pass through.
59. Which type of energy is associated with an object in motion?
a) Kinetic energy
b) Potential energy
c) Thermal energy
d) Sound energy
Answer: a) Kinetic energy
Explanation: Kinetic energy is the energy associated with an object in motion. The amount of kinetic energy an object has depends on its mass and velocity.
60. Which type of energy is associated with the position of an object in a field?
a) Kinetic energy
b) Potential energy
c) Thermal energy
d) Sound energy
Answer: b) Potential energy
Explanation: Potential energy is the energy associated with the position of an object in a field, such as gravity or an electric field. The amount of potential energy an object has depends on its position in the field and its properties.
61. Which type of force is responsible for keeping an object in circular motion?
a) Gravitational force
b) Electrostatic force
c) Centripetal force
d) Frictional force
Answer: c) Centripetal force
Explanation: Centripetal force is the force responsible for keeping an object in circular motion. It acts perpendicular to the velocity of the object and points towards the center of the circular path.
62. Which law of thermodynamics states that the total entropy of a closed system will always increase over time?
a) First law
b) Second law
c) Third law
d) Fourth law
Answer: b) Second law
Explanation: The second law of thermodynamics states that the total entropy of a closed system will always increase over time. Entropy is a measure of the disorder or randomness of a system, and this law implies that natural processes tend to move towards a more disordered state.
63. What is the formula for calculating power?
Answer: power = work/time
Explanation: The formula for calculating power is power = work/time, where power is the amount of work done per unit of time.
64. Which type of electromagnetic wave is used for communication over long distances?
a) Radio waves
b) Microwaves
c) Infrared radiation
d) Ultraviolet radiation
Answer: a) Radio waves
Explanation: Radio waves are a type of electromagnetic wave that is commonly used for communication over long distances, such as in radio and television broadcasts.
65. What is the formula for calculating electric power?
Answer: electric power = current * voltage
Explanation: The formula for calculating electric power is electric power = current * voltage, where power is the product of current and voltage.
66. Which type of energy is associated with the movement of molecules in a substance?
a) Kinetic energy
b) Potential energy
c) Thermal energy
d) Sound energy
Answer: c) Thermal energy
Explanation: Thermal energy is the energy associated with the movement of molecules in a substance. It is a type of kinetic energy that is transferred from hotter objects to colder objects.
67. Which law of motion states that an object at rest will remain at rest, and an object in motion will continue in motion with a constant velocity, unless acted upon by an external force?
a) First law
b) Second law
c) Third law
d) Fourth law
Answer: a) First law
Explanation: The first law of motion, also known as the law of inertia, states that an object at rest will remain at rest, and an object in motion will continue in motion with a constant velocity, unless acted upon by an external force.
68. Which type of energy is associated with the flow of electric charge?
a) Kinetic energy
b) Potential energy
c) Thermal energy
d) Electrical energy
Answer: d) Electrical energy
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| Physics MCQ |
69. What is the unit of force?
a) Newton
b) Joule
c) Watt
d) Pascal
Answer: a) Newton
Explanation: The unit of force is the newton (N), which is defined as the amount of force required to accelerate a mass of one kilogram at a rate of one meter per second squared.
70. Which type of electromagnetic wave has the shortest wavelength?
a) Radio waves
b) X-rays
c) Ultraviolet radiation
d) Gamma rays
Answer: d) Gamma rays
Explanation: Gamma rays have the shortest wavelength of any electromagnetic wave, ranging from less than one picometer to about 10 femtometers.
71. Which law of motion states that for every action, there is an equal and opposite reaction?
a) First law
b) Second law
c) Third law
d) Fourth law
Answer: c) Third law
Explanation: The third law of motion states that for every action, there is an equal and opposite reaction. This means that when one object exerts a force on another object, the second object exerts an equal and opposite force on the first object.
72. What is the formula for calculating force?
Answer: force = mass * acceleration
Explanation: The formula for calculating force is force = mass * acceleration, where force is the product of an object's mass and its acceleration.
73. Which type of energy is associated with the motion of atoms and molecules?
a) Kinetic energy
b) Potential energy
c) Thermal energy
d) Electrical energy
Answer: a) Kinetic energy
Explanation: Kinetic energy is the energy associated with the motion of an object. In the case of atoms and molecules, their motion contributes to the overall thermal energy of a substance.
74. What is the formula for calculating momentum?
Answer: momentum = mass * velocity
Explanation: The formula for calculating momentum is momentum = mass * velocity, where momentum is the product of an object's mass and its velocity.
75. Which type of electromagnetic wave is used for cooking food?
a) Radio waves
b) Microwaves
c) Infrared radiation
d) Ultraviolet radiation
Answer: b) Microwaves
Explanation: Microwaves are a type of electromagnetic wave that is commonly used for cooking food, as they can be absorbed by water molecules and cause them to vibrate, which in turn generates heat.
76. Which law of thermodynamics states that energy cannot be created or destroyed, but can only be transformed from one form to another?
a) First law
b) Second law
c) Third law
d) Fourth law
Answer: a) First law
Explanation: The first law of thermodynamics, also known as the law of conservation of energy, states that energy cannot be created or destroyed, but can only be transformed from one form to another.
77. What is the unit of power?
a) Newton
b) Joule
c) Watt
d) Pascal
Answer: c) Watt
Explanation: The unit of power is the watt (W), which is defined as the rate at which work is done or energy is transferred.
78. Which type of energy is associated with the position of an object in a gravitational field?
a) Kinetic energy
b) Potential energy
c) Thermal energy
d) Sound energy
Answer: b) Potential energy
Explanation: Potential energy is the energy associated with the position of an object in a gravitational field. The amount of potential energy an object has depends on its height above a reference point and its mass.
79. What is the formula for calculating work?
Answer: work = force * distance * cos(theta)
Explanation: The formula for calculating work is work = force * distance * cos(theta), where force is the amount of force applied to an object, distance is the distance over which the force is applied, and theta is the angle between the force and the displacement of the object.
80. Which law of thermodynamics states that the entropy of an isolated system always increases over time?
a) First law
b) Second law
c) Third law
d) Fourth law
Answer: b) Second law
Explanation: The second law of thermodynamics states that the entropy of an isolated system always increases over time, meaning that the amount of energy available to do work decreases.
81. What is the formula for calculating potential energy?
Answer: potential energy = mgh
Explanation: The formula for calculating potential energy is potential energy = mgh, where m is the mass of the object, g is the acceleration due to gravity, and h is the height of the object above a reference point.
82. What is the formula for calculating kinetic energy?
Answer: kinetic energy = 0.5 * m * v^2
Explanation: The formula for calculating kinetic energy is kinetic energy = 0.5 * m * v^2, where m is the mass of the object and v is its velocity.
83. Which type of energy is associated with the motion of electrically charged particles?
a) Kinetic energy
b) Potential energy
c) Thermal energy
d) Electrical energy
Answer: d) Electrical energy
Explanation: Electrical energy is the energy associated with the motion of electrically charged particles. It can be harnessed to power electronic devices.
84. Which type of electromagnetic wave has a wavelength of about 400-700 nm?
a) X-rays
b) Gamma rays
c) Visible light
d) Infrared radiation
Answer: c) Visible light
Explanation: Visible light is a type of electromagnetic wave that has a wavelength range of about 400-700 nm. It is the portion of the electromagnetic spectrum that is visible to the human eye and is responsible for our perception of color.
85. What is the formula for calculating power?
Answer: power = work/time
Explanation: The formula for calculating power is power = work/time, where work is the amount of energy transferred or used over a certain period of time, and time is the duration over which the work is performed.
86. What is the formula for calculating electric current?
Answer: electric current = charge/time
Explanation: The formula for calculating electric current is electric current = charge/time, where charge is the amount of electric charge flowing through a conductor in a certain period of time.
87. Which law of motion states that every action has an equal and opposite reaction?
a) First law
b) Second law
c) Third law
d) Fourth law
Answer: c) Third law
Explanation: The third law of motion, also known as the law of action and reaction, states that every action has an equal and opposite reaction. This means that for every force acting on an object, there is an equal and opposite force acting in the opposite direction.
88. What is the unit of pressure?
a) Newton
b) Joule
c) Pascal
d) Watt
Answer: c) Pascal
Explanation: The unit of pressure is the pascal (Pa), which is defined as one newton per square meter (N/m²). It is named after the French mathematician and physicist Blaise Pascal.
89. Which type of lens is thicker at the center than at the edges?
a) Convex lens
b) Concave lens
c) Plano-convex lens
d) Plano-concave lens
Answer: a) Convex lens
Explanation: A convex lens is thicker at the center than at the edges, and it converges light rays to a focal point. It is also known as a converging lens.
90. Which type of lens is thinner at the center than at the edges?
a) Convex lens
b) Concave lens
c) Plano-convex lens
d) Plano-concave lens
Answer: b) Concave lens
Explanation: A concave lens is thinner at the center than at the edges, and it diverges light rays. It is also known as a diverging lens.
91. What is the formula for calculating frequency?
Answer: frequency = 1/period
Explanation: The formula for calculating frequency is frequency = 1/period, where period is the time it takes for one complete cycle of a wave to occur.
92. Which type of wave does not require a medium to propagate?
a) Sound wave
b) Light wave
c) Water wave
d) Seismic wave
Answer: b) Light wave
Explanation: Light waves are a type of electromagnetic wave that can travel through empty space and do not require a medium to propagate. Sound waves, water waves, and seismic waves require a medium to propagate.
93. What is the formula for calculating acceleration?
Answer: acceleration = (final velocity - initial velocity)/time
Explanation: The formula for calculating acceleration is acceleration = (final velocity - initial velocity)/time, where final velocity is the velocity at the end of the time interval, initial velocity is the velocity at the beginning of the time interval, and time is the duration of the time interval.
94. What is the unit of electric potential difference?
a) Volt
b) Ampere
c) Ohm
d) Watt
Answer: a) Volt
Explanation: The unit of electric potential difference, also known as voltage, is the volt (V). It is named after the Italian physicist Alessandro Volta.
95. What is the formula for calculating electric resistance?
Answer: electric resistance = voltage/current
Explanation: The formula for calculating electric resistance is electric resistance = voltage/current, where voltage is the electric potential difference across a conductor and current is the flow of electric charge through the conductor.
96. Which law of motion states that the rate of change of momentum of an object is directly proportional to the applied force and takes place in the direction of the force?
a) First law
b) Second law
c) Third law
d) Fourth law
Answer: b) Second law
Explanation: The second law of motion states that the rate of change of momentum of an object is directly proportional to the applied force and takes place in the direction of the force. This can be expressed mathematically as F = ma, where F is the applied force, m is the mass of the object, and a is its acceleration.
97. What is the formula for calculating density?
Answer: density = mass/volume
Explanation: The formula for calculating density is density = mass/volume, where mass is the amount of matter in an object and volume is the amount of space it occupies.
98. What is the unit of energy?
a) Joule
b) Watt
c) Newton
d) Pascal
Answer: a) Joule
Explanation: The unit of energy is the joule (J), which is defined as the amount of work done by a force of one new
99. Which of the following types of energy is associated with motion?
a) Thermal energy
b) Chemical energy
c) Nuclear energy
d) Kinetic energy
Answer: d) Kinetic energy
Explanation: Kinetic energy is the energy of motion, and it is proportional to the mass of an object and the square of its velocity. Thermal energy is the energy of the movement of particles, chemical energy is the energy stored in chemical bonds, and nuclear energy is the energy stored in the nucleus of an atom.
100. What is the formula for calculating work?
Answer: work = force x distance x cos(theta)
Explanation: The formula for calculating work is work = force x distance x cos(theta), where force is the applied force, distance is the distance traveled by the object, and theta is the angle between the force and the direction of motion of the object.
101. Which law of thermodynamics states that energy cannot be created or destroyed, only transferred or transformed from one form to another?
a) First law
b) Second law
c) Third law
d) Fourth law
Answer: a) First law
Explanation: The first law of thermodynamics, also known as the law of conservation of energy, states that energy cannot be created or destroyed, only transferred or transformed from one form to another.
102. What is the formula for calculating power?
Answer: power = work/time
Explanation: The formula for calculating power is power = work/time, where work is the amount of energy transferred or transformed and time is the duration of the process.
103. What is the unit of electric current?
a) Volt
b) Ampere
c) Ohm
d) Watt
Answer: b) Ampere
Explanation: The unit of electric current is the ampere (A), which is defined as the flow of electric charge per unit time.
104. What is the formula for calculating electric power?
Answer: electric power = voltage x current
Explanation: The formula for calculating electric power is electric power = voltage x current, where voltage is the electric potential difference across a conductor and current is the flow of electric charge through the conductor.
105. What is the unit of electric charge?
a) Volt
b) Ampere
c) Ohm
d) Coulomb
Answer: d) Coulomb
Explanation: The unit of electric charge is the coulomb (C), which is defined as the amount of electric charge transported by a constant current of one ampere in one second.
106. Which law of motion states that for every action, there is an equal and opposite reaction?
a) First law
b) Second law
c) Third law
d) Fourth law
Answer: c) Third law
Explanation: The third law of motion states that for every action, there is an equal and opposite reaction. This means that if object A exerts a force on object B, object B exerts an equal and opposite force on object A.
107. What is the formula for calculating pressure?
Answer: pressure = force/area
Explanation: The formula for calculating pressure is pressure = force/area, where force is the applied force and area is the surface area over which the force is applied.
108. Which type of wave is characterized by oscillations perpendicular to the direction of wave propagation?
a) Longitudinal wave
b) Transverse wave
c) Electromagnetic wave
d) Standing wave
Answer: b) Transverse wave
Explanation: A transverse wave is characterized by oscillations perpendicular to the direction of wave propagation. This is in contrast to a longitudinal wave, which is characterized by oscillations parallel to the direction of wave propagation. Electromagnetic waves are a type of transverse wave, while standing waves are a
109. What is the unit of frequency?
a) Hertz
b) Newton
c) Joule
d) Watt
Answer: a) Hertz
Explanation: The unit of frequency is the hertz (Hz), which is defined as the number of cycles or oscillations per second.
110. Which law of thermodynamics states that heat cannot spontaneously flow from a colder body to a hotter body?
a) First law
b) Second law
c) Third law
d) Fourth law
Answer: b) Second law
Explanation: The second law of thermodynamics states that heat cannot spontaneously flow from a colder body to a hotter body, and that in any energy transfer or transformation, the total entropy of a closed system will always increase.
111. What is the formula for calculating force?
Answer: force = mass x acceleration
Explanation: The formula for calculating force is force = mass x acceleration, where mass is the amount of matter in an object and acceleration is the rate of change of its velocity.
112. What is the unit of work?
a) Joule
b) Watt
c) Ampere
d) Volt
Answer: a) Joule
Explanation: The unit of work is the joule (J), which is defined as the amount of energy expended when a force of one newton is applied over a distance of one meter.
113. Which law of motion states that an object at rest will remain at rest, and an object in motion will remain in motion at a constant velocity, unless acted upon by an external force?
a) First law
b) Second law
c) Third law
d) Fourth law
Answer: a) First law
Explanation: The first law of motion, also known as the law of inertia, states that an object at rest will remain at rest, and an object in motion will remain in motion at a constant velocity, unless acted upon by an external force.
114. What is the unit of pressure?
a) Pascal
b) Newton
c) Joule
d) Watt
Answer: a) Pascal
Explanation: The unit of pressure is the pascal (Pa), which is defined as the force of one newton per square meter.
115. What is the formula for calculating density?
Answer: density = mass/volume
Explanation: The formula for calculating density is density = mass/volume, where mass is the amount of matter in an object and volume is the amount of space it occupies.
116. Which type of energy is associated with the position or configuration of an object?
a) Kinetic energy
b) Potential energy
c) Thermal energy
d) Nuclear energy
Answer: b) Potential energy
Explanation: Potential energy is the energy associated with the position or configuration of an object, and it is proportional to its height or distance from a reference point.
117. What is the formula for calculating acceleration?
Answer: acceleration = (final velocity - initial velocity)/time
Explanation: The formula for calculating acceleration is acceleration = (final velocity - initial velocity)/time, where final velocity is the velocity at the end of a period of time, initial velocity is the velocity at the beginning of that period of time, and time is the duration of the period.
118. What is the unit of power?
a) Watt
b) Joule
c) Ampere
d) Volt
Answer: a) Watt
Explanation: The unit of power is the watt (W), which is defined as the rate of energy transfer or transformation per unit time.
119. Which type of waves are used in communication through mobile phones?
a) Radio waves
b) Sound waves
c) X-rays
d) Ultraviolet waves
Answer: a) Radio waves
Explanation: Mobile phones use radio waves for communication, which are a type of electromagnetic waves that have the lowest frequency and the longest wavelength in the electromagnetic spectrum.
120. What is the unit of electric current?
a) Ampere
b) Volt
c) Ohm
d) Watt
Answer: a) Ampere
Explanation: The unit of electric current is the ampere (A), which is defined as the rate of flow of electric charge through a conductor.
121. Which law of motion states that for every action, there is an equal and opposite reaction?
a) First law
b) Second law
c) Third law
d) Fourth law
Answer: c) Third law
Explanation: The third law of motion states that for every action, there is an equal and opposite reaction, which means that when two objects interact, the forces they exert on each other are always equal in magnitude and opposite in direction.
122. What is the formula for calculating voltage?
Answer: voltage = current x resistance
Explanation: The formula for calculating voltage is voltage = current x resistance, where current is the flow of electric charge through a conductor and resistance is the opposition to the flow of electric current.
123. What is the unit of capacitance?
a) Farad
b) Henry
c) Ohm
d) Siemens
Answer: a) Farad
Explanation: The unit of capacitance is the farad (F), which is defined as the ability of a capacitor to store electric charge per unit voltage.
124. Which type of lens converges light rays?
a) Convex lens
b) Concave lens
c) Plano-convex lens
d) Plano-concave lens
Answer: a) Convex lens
Explanation: A convex lens is a lens that is thicker in the middle than at the edges, and it converges light rays to a point called the focal point.
125. What is the formula for calculating electric power?
Answer: electric power = voltage x current
Explanation: The formula for calculating electric power is electric power = voltage x current, where voltage is the difference in electric potential between two points and current is the flow of electric charge through a conductor.
126. What is the unit of magnetic flux density?
a) Tesla
b) Gauss
c) Weber
d) Henry
Answer: a) Tesla
Explanation: The unit of magnetic flux density is the tesla (T), which is defined as the magnetic flux per unit area.
127. Which type of waves are used in medical imaging?
a) Radio waves
b) X-rays
c) Ultraviolet waves
d) Gamma rays
Answer: b) X-rays
Explanation: X-rays are a type of electromagnetic waves that have a high frequency and a short wavelength, and they are used in medical imaging to produce images of the internal structure of the body.
128. What is the formula for calculating electric resistance?
Answer: electric resistance = voltage/current
Explanation: The formula for calculating electric resistance is electric resistance = voltage/current, where voltage is the difference in electric potential between two points and current is the flow of electric charge through a conductor.
129. What is the unit of work?
a) Joule
b) Newton
c) Watt
d) Ampere
Answer: a) Joule
Explanation: The unit of work is the joule (J), which is defined as the amount of energy transferred when a force of one newton is applied over a distance of one meter.
130. Which type of mirror always produces an inverted image?
a) Convex mirror
b) Concave mirror
c) Plane mirror
d) Spherical mirror
Answer: b) Concave mirror
Explanation: A concave mirror is a mirror that is curved inward like the inside of a sphere, and it always produces an inverted image.
131. What is the formula for calculating force?
Answer: force = mass x acceleration
Explanation: The formula for calculating force is force = mass x acceleration, where mass is the amount of matter in an object and acceleration is the rate of change of velocity.
132. What is the unit of pressure?
a) Pascal
b) Joule
c) Newton
d) Watt
Answer: a) Pascal
Explanation: The unit of pressure is the pascal (Pa), which is defined as the force per unit area.
133. Which type of energy is associated with motion?
a) Potential energy
b) Kinetic energy
c) Thermal energy
d) Nuclear energy
Answer: b) Kinetic energy
Explanation: Kinetic energy is the energy associated with motion, and it depends on the mass and velocity of an object.
134. What is the formula for calculating speed?
Answer: speed = distance/time
Explanation: The formula for calculating speed is speed = distance/time, where distance is the length of the path traveled by an object and time is the duration of the travel.
135. What is the unit of frequency?
a) Hertz
b) Watt
c) Ampere
d) Volt
Answer: a) Hertz
Explanation: The unit of frequency is the hertz (Hz), which is defined as the number of cycles per second.
136. What is the formula for calculating acceleration?
Answer: acceleration = (final velocity - initial velocity)/time
Explanation: The formula for calculating acceleration is acceleration = (final velocity - initial velocity)/time, where final velocity is the velocity of an object at the end of a given period of time, initial velocity is the velocity of the object at the beginning of the period, and time is the duration of the period.
137. Which law of thermodynamics states that the total entropy of a closed system can never decrease over time?
a) First law
b) Second law
c) Third law
d) Fourth law
Answer: b) Second law
Explanation: The second law of thermodynamics states that the total entropy of a closed system can never decrease over time, which means that the disorder or randomness of a system will always tend to increase or remain constant.
138. What is the formula for calculating momentum?
Answer: momentum = mass x velocity
Explanation: The formula for calculating momentum is momentum = mass x velocity, where mass is the amount of matter in an object and velocity is the rate of change of its position.
139. Which type of circuit has only one path for current to flow?
a) Parallel circuit
b) Series circuit
c) Open circuit
d) Short circuit
Answer: b) Series circuit
Explanation: A series circuit has only one path for current to flow, and all components are connected in a sequence, which means that the current passing through each component is the same.
140. What is the SI unit of electric charge?
a) Coulomb
b) Ampere
c) Watt
d) Volt
Answer: a) Coulomb
Explanation: The SI unit of electric charge is the coulomb (C), which is defined as the amount of charge transported by a constant current of one ampere in one second.
141. What is the formula for calculating power?
Answer: power = work/time
Explanation: The formula for calculating power is power = work/time, where work is the amount of energy transferred and time is the duration of the transfer.
142. Which type of wave can travel through a vacuum?
a) Sound wave
b) Water wave
c) Light wave
d) Radio wave
Answer: c) Light wave
Explanation: Light waves are a type of electromagnetic wave, which means that they can travel through a vacuum, unlike sound waves and water waves that require a medium to propagate.
143. What is the formula for calculating electric potential energy?
Answer: electric potential energy = electric charge x electric potential difference
Explanation: The formula for calculating electric potential energy is electric potential energy = electric charge x electric potential difference, where electric charge is the amount of electric charge and electric potential difference is the difference in electric potential between two points.
144. Which type of lens is used to correct nearsightedness?
a) Convex lens
b) Concave lens
c) Plano-convex lens
d) Plano-concave lens
Answer: b) Concave lens
Explanation: A concave lens is used to correct nearsightedness, which means that it helps diverge light rays before they reach the eye's lens, allowing them to focus correctly on the retina.
145. What is the formula for calculating electric current?
Answer: electric current = electric charge/time
Explanation: The formula for calculating electric current is electric current = electric charge/time, where electric charge is the amount of electric charge flowing and time is the duration of the flow.
146. Which type of force holds the nucleus of an atom together?
a) Electromagnetic force
b) Gravitational force
c) Strong nuclear force
d) Weak nuclear force
Answer: c) Strong nuclear force
Explanation: The nucleus of an atom is held together by the strong nuclear force, which is one of the fundamental forces of nature.
147. What is the formula for calculating voltage?
Answer: voltage = electric energy/ electric charge
Explanation: The formula for calculating voltage is voltage = electric energy/electric charge, where electric energy is the amount of electrical potential energy and electric charge is the amount of electric charge flowing.
148. Which type of material allows electric current to flow through it easily?
a) Conductor
b) Insulator
c) Semiconductor
d) Superconductor
Answer: a) Conductor
Explanation: A conductor is a material that allows electric current to flow through it easily, due to its ability to transfer electric charges from one point to another.
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