Work, Energy and Power Quiz

1. Work is said to be done when a force:

Acts on a body only
Produces displacement in a body
Changes the color of a body
Changes the temperature only

2. The formula for work done by a constant force is:

\(W=F+s\)
\(W=F/s\)
\(W=Fs\cos\theta\)
\(W=mgh\)

3. The SI unit of work is:

Joule
Newton
Watt
Pascal

4. Work is a:

Vector quantity
Scalar quantity
Fundamental quantity
Unitless quantity

5. When force is perpendicular to displacement, work done is:

Maximum
Negative
Zero
Infinite

6. Energy is defined as the:

Rate of doing work
Capacity to do work
Force acting on a body
Change in velocity

7. The energy possessed by a body due to its motion is called:

Potential energy
Heat energy
Sound energy
Kinetic energy

8. The formula of kinetic energy is:

\(K=mv\)
\(K=\frac{1}{2}mv^2\)
\(K=mgh\)
\(K=Fs\)

9. Potential energy is the energy possessed by a body due to its:

Position, shape, or configuration
Speed only
Temperature only
Color only

10. The formula of gravitational potential energy is:

\(U=mgh\)
\(U=\frac{1}{2}mv^2\)
\(U=Fv\)
\(U=W/t\)

11. Mechanical energy is the sum of:

Force and displacement
Work and power
Kinetic energy and potential energy
Mass and velocity

12. The law of conservation of energy states that energy:

Can be created easily
Can be destroyed completely
Can neither be created nor destroyed
Has no relation with work

13. Various forms of energy are:

Not related to each other
Interconvertible
Always zero
Destroyed after use

14. When a ball is thrown vertically upward:

Kinetic energy increases and potential energy decreases
Kinetic energy decreases and potential energy increases
Both kinetic and potential energy become zero
Energy is destroyed

15. Power is defined as the:

Rate of doing work
Capacity to do work
Product of mass and velocity
Force per unit area

16. The formula of power is:

\(P=Wt\)
\(P=\frac{W}{t}\)
\(P=mgh\)
\(P=Fs\)

17. The SI unit of power is:

Joule
Newton
Watt
Pascal

18. One watt is equal to:

\(1\,J/s\)
\(1\,N/m\)
\(1\,kg/m\)
\(1\,m/s\)

19. The commercial unit of electrical energy is:

Watt
Kilowatt-hour
Newton
Pascal

20. One kilowatt-hour is equal to:

\(3.6 \times 10^3\,J\)
\(3.6 \times 10^4\,J\)
\(3.6 \times 10^6\,J\)
\(3.6 \times 10^9\,J\)