Physics GK 05 - Work, Energy and Power

1. 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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2. The dot product of two vectors A and B is equal to the product of magnitude of A and B and __________?
[A] cosine of the largest angle between them
[B] sine of the largest angle between them
[C] cosine of the smallest angle between them
[D] sine of the smallest angle between them

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3. What is the dot product of two perpendicular vectors?
[A] 1
[B] 0
[C] -1
[D] 1/2

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4. Work done is defined as the dot product of which of the following vectors?
[A] Force and acceleration
[B] Force and area
[C] Force and instantaneous velocity
[D] Force and displacement

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5. What is the dimensional formula of work done?
[A] M1 L1 T-1
[B] M1 L2 T-1
[C] M1 L-1 T-2
[D] M1 L2 T-2

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6. Which of the following is NOT correct about units of work:
[A] 1 joule = 107 ergs
[B] 1 kg-m = 1 joule
[C] 1 kg-m = 9.8 joule
[D] 1 joule = 1 Nm

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7. Work done will NOT be zero in which of the following case/cases?
[A] When displacement is zero
[B] When angle between force and displacement vector is zero
[C] When angle between force and displacement vector is 90°
[D] When force is zero

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8. The work done by a variable force is given by:
[A] area under the force curve and the displacement axis
[B] square of the area under the force curve and the displacement axis
[C] natural log of the area under the force curve and the displacement axis
[D] twice the area under the force curve and the displacement axis

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9. Which of the following is NOT a conservative force?
[A] Electrostatic force
[B] Magnetic force
[C] Force in an elastic spring
[D] Frictional force

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10. The work done in moving a body over a smooth inclined plane does not depend on which of the following?
[A] mass of the body
[B] height of the inclined plane
[C] slope of the inclined plane
[D] All of the above

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