Physics Mcqs Page 4 - Pak Mcqs Point

Most Important Physics Mcqs

61- The charge of an electron is:

A. 0 C

B. +1.6 × 10⁻¹⁹ C

C. -1.6 × 10⁻¹⁹ C

D. +9.1 × 10⁻³¹ C

View Answer

Answer : C. -1.6 × 10⁻¹⁹ C

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62- The phenomenon where light behaves as both a wave and a particle is called:

A. Dual nature of light

B. Diffraction

C. Polarization

D. Interference

View Answer

Answer : A. Dual nature of light

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63- The momentum of an object is the product of its:

A. Mass and acceleration

B. Mass and velocity

C. Force and time

D. Velocity and acceleration

View Answer

Answer : B. Mass and velocity

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64- If no external force acts on a system of particles, their total momentum:

A. Increases

B. Decreases

C. Remains constant

D. Becomes zero

View Answer

Answer : C. Remains constant

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65- A car moving with uniform speed around a circular track has:

A. Changing acceleration

B. Constant velocity

C. No acceleration

D. Constant acceleration

View Answer

Answer : D. Constant acceleration

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66- A freely falling body has a constant:

A. Speed

B. Acceleration

C. Momentum

D. Displacement

View Answer

Answer : B. Acceleration

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67- The energy possessed by a body due to its motion is called:

A. Kinetic energy

B. Potential energy

C. Chemical energy

D. Thermal energy

View Answer

Answer : A. Kinetic energy

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68- The SI unit of work is:

A. Joule

B. Newton

C. Watt

D. Pascal

View Answer

Answer : A. Joule

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69- Power is defined as:

A. Force × Displacement

B. Work × Distance

C. Work × Time

D. Work/Time

View Answer

Answer : D. Work/Time

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70- A body is lifted vertically upwards. The work done against gravity depends on:

A. The speed of lifting

B. The path taken

C. The weight of the body and height lifted

D. The time taken

View Answer

Answer : C. The weight of the body and height lifted

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71- The density of water is maximum at:

A. 0°C

B. 4°C

C. 100°C

D. 273°C

View Answer

Answer : B. 4°C

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72- The upward force experienced by a body when submerged in a fluid is called:

A. Gravitational force

B. Buoyant force

C. Centripetal force

D. Frictional force

View Answer

Answer : B. Buoyant force

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73- Bernoulli’s theorem is based on the conservation of:

A. Energy

B. Charge

C. Mass

D. Momentum

View Answer

Answer : A. Energy

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74- Which property of a liquid allows insects to walk on its surface ?

A. Viscosity

B. Density

C. Capillarity

D. Surface tension

View Answer

Answer : D. Surface tension

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75- Sound waves are:

A. Longitudinal waves

B. Electromagnetic waves

C. Transverse waves

D. None of these

View Answer

Answer : B. Longitudinal waves

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76- The speed of sound is fastest in:

A. Air

B. Water

C. Vacuum

D. Steel

View Answer

Answer : D. Steel

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77- The number of oscillations per second is called:

A. Wavelength

B. Amplitude

C. Frequency

D. Speed

View Answer

Answer : C. Frequency

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78- The SI unit of sound intensity is:

A. Decibel

B. Hertz

C. Newton

D. Joule

View Answer

Answer : A. Decibel

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79- The unit of electric charge is:

A. Ampere

B. Volt

C. Coulomb

D. Ohm

View Answer

Answer : C. Coulomb

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80- A material that does not allow electricity to pass through is called a:

A. Conductor

B. Semiconductor

C. Resistor

D. Insulator

View Answer

Answer : D. Insulator

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