MCQ questions for class 9 Science Chapter 11 Work and Energy
Question 1: What is the scientific unit of work?
Joule
Newton
Watt
Meter
Question 2: Which of the following is a scalar quantity?
Force
Work
Velocity
Acceleration
Question 3: In the scientific equation W = F * d, what does "F" represent?
Distance
Time
Force
Work done
Question 4: Work is said to be done when a force:
Moves an object
Acts on an object
Changes the state of an object
All of the above
Question 5: The work done by a force is equal to the product of the force and the:
Distance moved in the direction of the force
Distance moved perpendicular to the force
Time for which the force is applied
Inverse of the distance moved
Question 6: If no work is done on an object, what can be said about the object?
It is stationary
It is in motion
It is at rest
It is in equilibrium
Question 7: Which of the following statements is true about the work done by gravity when a ball is thrown vertically upward?
Gravity does positive work
Gravity does negative work
Gravity does zero work
Gravity does work only if the ball reaches its highest point
Question 8: What is the kinetic energy of an object dependent on?
Mass and velocity
Mass and height
Force and displacement
Density and volume
Question 9: The energy possessed by an object due to its position or state is called:
Kinetic energy
Potential energy
Mechanical energy
Radiant energy
Question 10: The mechanical energy of an object is the sum of its:
Kinetic energy and potential energy
Potential energy and work done
Work done and kinetic energy
Kinetic energy and heat energy
Question 11: What is the formula for calculating kinetic energy?
1/2 * mv²
mv
m²v
1/2 * m²v
Question 12: What is the potential energy of an object dependent on?
Mass and velocity
Mass and height
Force and displacement
Density and volume
Question 13: The gravitational potential energy of an object is directly proportional to its:
Mass
Velocity
Height
Density
Question 14: The law of conservation of energy states that:
Energy can be created but not destroyed
Energy can be destroyed but not created
Energy cannot be created or destroyed, only transformed from one form to another
Energy can neither be created nor destroyed nor transformed
Question 15: Which form of energy is associated with the motion of molecules and atoms?
Kinetic energy
Potential energy
Mechanical energy
Nuclear energy
Question 16: The SI unit of energy is the same as the SI unit of work. What is this unit?
Joule
Newton
Watt
Meter
Question 17: Which of the following is an example of potential energy?
A moving car
A stretched rubber band
A spinning top
A burning candle
Question 18: What type of energy is associated with the motion of an object against a force of friction?
Kinetic energy
Potential energy
Mechanical energy
Heat energy
Question 19: If a force is applied to an object but it does not move, what can be said about the work done?
Work is done
No work is done
Negative work is done
Positive work is done
Question 20: What is the relationship between work done and energy?
Work done is the same as energy
Work done is the opposite of energy
Work done is a form of energy
Work done and energy are unrelated
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