6. Which of the following is not true about energy?
A. Energy makes life convenient and comfortable.
B. Life is not possible on Earth without energy from the sun.
C. The only source of energy on Earth is the sun.
D. Energy makes work easier and faster.

7. What form of energy operates LRT and MRT?
A. Sound Energy
B. Electrical Energy
C. Solar Energy
D. Nuclear Energy

8. When do sound waves occur?
A. When an object grows
B. when an object is in stationary position
C. when an object stops
D. when an object vibrates

9. It is a device consisting of few parts used to work easier and faster by reducing the effort or force used in doing the work.
A. Simple machine
B. Household machine
C. Construction machine
D. Safety machine

10. It is the force that is applied to one part of the bar.
A. Bar
B. effort
C. fulcrum
D. load​