Order Work Energy and Power Essay

Order Work Energy and Power Essay
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Order Work Energy and Power Essay
1. The work done by a force is equal to the
(a) scalar product of the force and other
displacement.
(b) scalar product of the force and the
velocity.
(c) scalar product of the mass and the
velocity.
(d) scalar product of the mass and
acceleration.
2. A man pushes a wall and fails to
displace it. He does
(a) negative work
(b) positive butnot maximum work
(c) no work at all
(d) maximum work
3. If a body is whirled in a circle the work
done on it ………… [RRB 2018]
(a) is negative
(b) is zero
(c) cannot be determined
(d) is positive
4. When a body is made to slide over a
rough horizontal surface, the work
done by the frictional force is
(a) positive
(b) negative
(c) zero
(d) may be positive and negative
5. When a body falls freely under gravity
then the work done by gravity is
(a) Positive (b) Negative
(c) Zero (d) Infinity
Order Work Energy and Power Essay
6. Assertion (A) Work done by friction on
a body sliding down an inclined plane is
positive.
Reason (R) Work done is greater than
zero it the angle between force and
displacement is acute.
Codes
(a) Both A and R are true and R is the
correct explanation of A
(b) Both A and R are true, but R is not the
correct explanation of A
(c) A is true, but R is false
(d) A is false, but R is true
7. The example of the conservative force is
(a) friction force (b) gravitational force
(c) viscous fore (d) None of these
8. Which one of the following force is
non-central and non-conservative?
(a) Frictional force [NDA 2019]
(b) Electric force
(c) Gravitational force
(d) Mechanical force
9. The energy of a body is
(a) its capacity of doing work.
(b) a scalar quantity.
(c) rate of doing work.
(d) Both (a) and (b)
10. The example of non-conventional
sources of energy is
(a) Geothermal energy
(b) Nuclear energy
(c) Wind energy
(d) Both (a) and (b)
11. Which one of the following is not a form
of stored energy? [NDA 2016]
(a) Nuclear energy
(b) Potential energy
(c) Electrical energy
(d) Chemical energy
12. Mechanical energy is the sum of
[RRB 2018]
(a) kinetic energy potential energy
(b) chemical energy electrical energy
(c) potential energy heat energy
(d) kinetic energy heat energy
13. The SI unit of mechanical energy is
(a) joule (b) watt [CDS 2016]
(c) newton-second (d) joule-second
14. What does the Kinetic Energy (KE) of a
moving body depend upon? [RRB 2018]
(a) Weight and its position
(b) Mass and its position
(c) Mass and velocity
(d) Mass and acceleration
Order Work Energy and Power Essay
15. How is the kinetic energy of a moving
object affected if the net work done on it
is positive? [NDA 2018]
(a) Decreases (b) Increases
(c) Remains constant (d) Becomes zero
16. A car is moving with a high speed. Which
energy does is posses? [RRB 2018]
(a) Kinetic energy
(b) Potential energy
(c) Frictional force
(d) Gravitational force
17. An object of mass 20 kg is moving with
an uniform velocity of 5 ms −1
. What is
the kinetic energy possessed by it?
(a) 350 J (b) 150 J [RRB 2018]
(c) 200 J (d) 250 J
18. Consider the following statements.
I. There is no net moment on a body
which is in equilibrium.
II. The momentum of a body is always
conserved.
III. The kinetic energy of an object is
always conserved.
Which of the statements (s) given above
is/are correct? [CDS 2018]
(a) Only I
(b) II and III
(c) I and II
(d) All of the above
19. A raised hammer possesses
(a) kinetic energy [RRB 2018]
(b) mechanical energy
(c) muscular energy
(d) potential energy
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