Physics GK 05 - Work, Energy and Power

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1).
Which of the following is NOT correct about an inelastic collision?
2).
The dot product of two vectors A and B is equal to the product of magnitude of A and B and __________?
3).
What is the dot product of two perpendicular vectors?
4).
Work done is defined as the dot product of which of the following vectors?
5).
What is the dimensional formula of work done?
6).
Which of the following is NOT correct about units of work:
7).
Work done will NOT be zero in which of the following case/cases?
8).
The work done by a variable force is given by:
9).
Which of the following is NOT a conservative force?
10).
The work done in moving a body over a smooth inclined plane does not depend on which of the following?
11).
What is the absolute unit of power in c.g.s system?
12).
What is the average power consumption of a heartbeat in an adult?
13).
The capacity of a body to do work is known as:
14).
1 electron volt of energy is equal to ____?
15).
Which of the following is/are correct about Kinetic energy?
16).
What will be the work done in holding a 25 kg iron plate for 25 seconds?
17).
What is the coefficient of restitution for a perfectly elastic collision?
18).
What is the effect on velocities of the two bodies of equal masses when they undergo elastic collision in one dimension?
19).
The energy by virtue of its position is known as:
20).
On which of the following quantities, Work done does not depend?
21).
What should be the angle between force and displacement for maximum work to be done?
22).
What happens to the velocity of a light body when it undergoes an elastic collision in one dimension with a very heavy body at rest?
23).
What happens to the velocity of a heavy body when it undergoes an elastic collision in one dimension with a very light body at rest?
24).
Which of the following is NOT an example of conservation of mechanical energy?
25).
What kind of energy is stored in the spring of a watch?
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
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
3. What is the dot product of two perpendicular vectors?
[A] 1
[B] 0
[C] -1
[D] 1/2
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
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
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
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
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
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
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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