Work Power And Energy(General Knowledge > General Science ) Questions and answers for exam Preparation

Question 1. Kinetic energy is associated with ---

speed
position
direction
temperature

Explanation:-

Answer: Option A. -> speed

Question 2. What are the two necessary conditions for work to be done?

Force and Velocity
Force and Displacement
Force and Time
None of these

Explanation:-

Answer: Option B. -> Force and Displacement

Question 3. Why does the total amount of mechanical energy stay constant in a system?

energy is not created or destroyed
energy leaves
energy enters
energy is not converted from one form into another

Explanation:-

Answer: Option A. -> energy is not created or destroyed

Question 4. What is the formula for calculating the total amount of mechanical energy?

ME = KE + PE
KE = ME + PE
PE = KE + ME
ME = 1/2 mv2

Explanation:-

Answer: Option A. -> ME = KE + PE

Question 5. Elastic potential energy is energy stored in object that are compressed or __________

movement
stored
harnessed
pulled

Explanation:-

Answer: Option B. -> stored

Question 6. A cannon shoots a 1000 N stunt performer 100 m

100,000 J
10,000 J
10 J
1,000,000 J

Explanation:-

Answer: Option A. -> 100,000 J

Question 7. What type of simple machine is a bike pedal?

Inclined Plane
Pulley
Wedge
Lever

Explanation:-

Answer: Option D. -> Lever

Question 8. The sun provides ____________ and ____________ energy that can be harnessed and used for solar power

chemical, sound
mechanical, light
sound, light
light, thermal

Explanation:-

Answer: Option D. -> light, thermal

Question 9. A 40-kg person is climbing 3 m up a flight of stairs in 6 seconds

400 J
1200 J
200 J
120 J

Explanation:-

Answer: Option B. -> 1200 J

Question 10. If a 1300-kg car has been lifted so it has 19500 J of potential energy, it was lifted up ---

1.5 m
150 m
15 m
0.67 m

Explanation:-

Answer: Option A. -> 1.5 m