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Class 11 Physics (Part I) Chapter 4 Work Quiz 55 (25 MCQs)

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1. North Korea tests a nuclear bomb by dropping it in the ocean. What is the energy transformation (Ignore gravitational potential energy!)
2. What are the units for the power formula:power=work/time
3. A boy exerts an average force of 68N when he lifts a box 1.1m. How much work does he do?
4. Is the force of attraction that causes an apple to fall to the ground
5. Mr. B's and Mr. P's classes competed in a game of tug of war. Mr. B's class pulled to the right with a force of 4, 000 N. Mr. P's class pulled to the left with a force of 5, 000 N. As a result the rope moved 5.1 m to the left. How much work was done by the net force?
6. The SI unit of work
7. What unit is commonly used to express work in physics?
8. The spring will have maximum potential energy when
9. When a car engine operates, it:
10. A man standing on the edge of the roof of a 20 m tall building projects a ball of mass 100 gm vertically up with a speed of 10 m s$^{-1}$. The kinetic energy of the ball when it reaches the ground will be [ g =10 m s$^{-2}$]
11. The units of the spring constant "k" are .....
12. The units of power are defined as
13. In the equation PE = mgh, what does the "g" mean?
14. In their physics class, Mia and Noah are performing an experiment. They push a 3.0 kg block of ice with a speed of 6.0 m/s across a wet lab table. What is the kinetic energy of the block of ice?
15. A force F = 4xi+3yj N moves a body in X direction with a distance of 5m. The work done in y direction is
16. If a machine does 500 Joules of work in 10 seconds, what is its power output?
17. If a rock falls from a cliff, at what point are its kinetic energy and its potential energy the same? Ignore air resistance.
18. Calculate the temperature increase of a 1kg brake pad if they have a SHC of 800Jkg$^{-1}$K$^{-1}$ and need to stop a 2000kg van travelling at 8ms$^{-1}$.
19. If you increase your work and decrease your time, you will have
20. What can be concluded of an object whose mass stays constant but its momentum is changing?
21. What term describes the accomplishment of or ability to accomplish a job with a minimum expenditure of time and effort?
22. Which of the following statements about the Principle of Conservation of Energy is true?
23. What is the formula for work in physics?
24. A toy car is traveling with a velocity of 4 m/s and has a mass of 1120 g. How much kinetic energy does the toy car have?
25. A lamp is switched on for 2.0 hours. The power input to the lamp is 1.0 W. The energy given outby the lamp as light is 7.0 x 10$^{3}$J.How much energy is converted to other forms by the lamp?
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