work energy and simple machines chapter 7

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MCQ Science Class 9
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Science Class 9

Work Energy and Simple Machines Chapter 7

CBSE Board

Teacher Name : Rakesh
Total Questions : 18
Time Allowed : 60
Total Marks : 18

Q 1 :In a seesaw, the point about which it balances is called the:
- Lever
- Effort
- Fulcrum
- Load
Q 2 :What is the SI unit of work?
- Joule
- Pascal
- Watt
- Newton
Q 3 :When is work said to be negative?
- When force is zero
- When force is applied vertically
- When displacement is zero
- When the force and displacement are in opposite directions
Q 4 :Which of the following is an example of kinetic energy?
- A book on a shelf
- A cricket ball in motion
- A raised flag
- A compressed spring
Q 5 :When a ball is thrown upward, what happens to its kinetic energy?
- It decreases as it rises
- It becomes potential energy only
- It increases as it rises
- It remains constant
Q 6 :What is the relationship between work and time in terms of power?
- Power = Work × Time
- Power = Work + Time
- Power = Work/Time
- Power = Time/Work
Q 7 :The work-energy theorem states that work done is equal to:
- Mechanical advantage
- Total energy
- Change in kinetic energy
- Potential energy
Q 8 :Which of the following is a case of mechanical advantage?
- Using a pulley to lift a heavy load
- Pushing a shopping cart
- Using a hammer to drive a nail
- Carrying a backpack
Q 9 :Which of the following is a condition for work to be done?
- Force must cause displacement
- Displacement must be zero
- Force must be in the opposite direction
- Force must be applied
Q 10 :What type of energy does a raised flowerpot possess?
- Chemical energy
- Kinetic energy
- Potential energy
- Mechanical energy
Q 11 :What is power defined as?
- Work done per unit distance
- Force multiplied by time
- Rate of doing work
- Total work done
Q 12 :What is the formula for calculating potential energy?
- PE = W/t
- PE = mgh
- PE = ½mv²
- PE = Fd
Q 13 :What happens to kinetic energy when a car brakes?
- It is stored as potential energy
- It is converted into heat energy
- It disappears
- It increases
Q 14 :What is the SI unit of power?
- Joule
- Newton
- Watt
- Horsepower
Q 15 :What is the formula for calculating kinetic energy?
- KE = mv
- KE = mgh
- KE = Fd
- KE = ½mv²
Q 16 :Which of the following transformations occurs in photosynthesis?
- Light energy to chemical energy
- Sound energy to electrical
- Chemical energy to heat
- Electrical energy to light
Q 17 :Which of the following is an example of energy conservation?
- Running a generator
- Using batteries
- Burning fossil fuels
- Using a solar panel to convert sunlight into electricity
Q 18 :Which of the following is an example of zero work?
- Pulling a cart
- Lifting a weight
- Pushing a stationary wall
- Carrying a heavy box while walking at constant height

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