Physics MCQs

Physics Objective (Multiple Choice) General Knowledge & General Science Questions & Answers for SSC-CGL, UPPSC, NDA, CDS and all one day examinations of India.

1. Which among the following is true about Total Internal Reflection?
[A] A ray passing from rarer to denser medium and not able to pass to denser medium at an angle greater than critical angle
[B] A ray passing from denser to rarer medium and not able to pass to rarer medium at an angle greater than critical angle
[C] A ray passing from either denser to rarer medium or rarer to denser medium and not able to pass any medium at an angle smaller than critical angle
[D] None of the above

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2. Which of the following is the unit of Impulse?
[A] N
[B] Ns
[C] N/s
[D] Ns2

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3. Power of lens is measured in which of the following units?
[A] metre
[B] dioptre
[C] lumen
[D] watt

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4. Two vectors are said to be equal if:
[A] they have equal magnitude and same direction
[B] they have equal magnitude and opposite direction
[C] they have equal magnitude and common initial point
[D] they have equal magnitude irrespective of the direction

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5. What is the apparent weight of the person when the elevator is accelerating downwards?
[A] equal to the actual weight
[B] greater than the actual weight
[C] less than the actual weight
[D] 0

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6. What is the relationship between Kinetic and limiting friction?
[A] Kinetic friction is slightly greater than limiting friction
[B] Kinetic friction is slightly less than limiting friction
[C] Kinetic friction is equal to limiting friction
[D] No relationship

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7. The thrust on the rocket is:
[A] in the same direction of the rocket
[B] in the opposite direction of the rocket
[C] at 90° to the direction of the rocket
[D] None of the above

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8. Which of the following is NOT correct about an inelastic collision?
[A] Linear momentum is conserved
[B] Kinetic energy is conserved
[C] Total energy is conserved
[D] Some or all the forces involved may be non-conservative in nature

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9. What is the orbital velocity of geo stationary satellite?
[A] 4.15 km/s
[B] 2.78 km/s
[C] 3.08 km/s
[D] 6.66 km/s

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10. What is the maximum stress after which the wire breaks called as?
[A] Tensile strength
[B] Shear strength
[C] Bulk strength
[D] Hooke’s strength

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