MCQs on Work Power and Energy
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Work Power and Energy – MCQs
Prepared by experts
1 – The change in the kinetic energy of an object is
- Is not equal to the work done on it by the net force.
- Is inversely promotional to the work done on it by the net force.
- Is equal to the work done on it by the net force.
- Is twice the work done on it by the net force?
Answer 3
2- Pick the right formula:
W = work done by the force
F = Force in the direction of displacement
d = magnitude of displacement
- W = F*d
- W = F /d
- W = F*F/d
- W = F / d*d
Answer 1
3 – What is the formula of kinetic energy?
K = Kinetic Energy
m = mass
v = velocity
- K = mv*v
- K = 2*m*v*v
- K = (1/2)*m*v*v
- K = (1/3)*m*v*v
Answer 3
4 – What is the work done by the external party against gravitational force:
m = mass, h = height, and g = acceleration on an object due to the gravity
- mg/h
- mgh
- m / g
- g /m
Answer 2
5 – The work done by the external agency against gravitational force is stored as
- Potential energy
- Kinetic Energy
- Gravitational Energy
- Centrifugal energy
Answer 1
6 – Work completed by a conservative force depends on
- Start position only
- Final position only
- Either starting or final position
- Start and Final position only
Answer 4
7 – If a ball of mass m is released from the stationary position from the top of an inclined plane that has no friction, what is the speed at the bottom:
- 2gh
- 2g/h
- gh
- √2gh
Answer 4
- The units of potential energy
- Is the same as that of Kinetic Energy and Work
- Is the same as that of Kinetic Energy but not the same as that of Work
- Is the same as that of work but not the same as that of kinetic energy
- Is not the same as that of kinetic energy and work
Answer 1
8 – The exothermic reaction ………. energy and endothermic reaction………… energy
- Absorbs, Releases
- Releases, Absorbs
- Releases, Releases
- Absorbs, Absorbs
9 – What is the equivalence of mass and energy equation?
E = energy, m = mass and c = speed of light
- E = m*c*c
- E = m*c
- E = m*c/c
- E = m/c
Answer 1
K Work is zero when
- Movement is zero
- There is no force
- Force and movement is at 90 degrees
- All of the above
Answer 4
L The work performed on an object moving in a circle is
- Zero
- Infinity
- Negative
- Positive
Answer 1
M Someone is sliding a piece of furniture weighing 100 Kg out of a loaded truck on a ramp at an angle of 45 degrees. Work by normal force is
- 45,00
- 100
- 450
- Zero
Answer 4
O. A car starts to break and stops in 50 m. The force exerted by road on the car is 300 N and is in opposite direction to the movement of the car. Work done by road on the car is
- 15,000 J
- – 15,000 J
- 5,000 J
- -5,000 J
Answer 2
P. Friction is ______ force
- Conservative
- Non Conservative
- Sometimes conservative sometimes non-conservative
- Neither Conservative nor Non-Conservative
Answer 2
Q Spring force is ____ force
- Conservative
- Non Conservative
- Sometimes conservative sometimes non-conservative
- Neither Conservative nor Non-Conservative
Answer 1
R. Mechanical energy of a system is the ____ of kinetic energy and potential energy
- Multiplication
- Sum
- Subtraction
- square
Answer 2
S. A body moves from point A to B. The sum of mechanical and potential energy at point A and at point B is constant. The mechanical energy of the system is hence a
- Nonconservative force
- Conservative force
- Neither conservative nor nonconservative
- Insufficient information available to answer this question
Answer 2
T. Gravity is__________ force
- Conservative
- Non Conservative
- Sometimes conservative sometimes nonconservative
- Neither Conservative nor Non-Conservative
Answer 1
U. A metal square hits a spring mounted on a floor horizontally, consider the mass of square 100 Kg and speed 10 m/s when it hit spring. What is the compression of the spring
Spring constant 3.25 1000 N/m
- 2 m
- 1.35 m
- 1.75 m
- 2.75 m
Answer 3