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11th Class Physics Chapter 4 MCQs with Answers

11th Class Physics Chapter 4 MCQs

Prepare for your exams with Work and Energy MCQs, covering work-energy principles, power, and energy conservation. These Chapter 4 quizzes help 11th Class Physics students strengthen their knowledge.

Work is defined as the product of:
a) Force and distance
b) Mass and velocity
c) Energy and time
d) Power and displacement

Answer
a) Force and distance

The SI unit of work is:
a) Watt
b) Newton
c) Joule
d) Pascal

Answer
c) Joule

Kinetic energy depends on an object’s:
a) Mass and velocity
b) Height and velocity
c) Weight and displacement
d) Force and time

Answer
a) Mass and velocity

Which form of energy is associated with the position of an object relative to a reference level?
a) Kinetic energy
b) Potential energy
c) Mechanical energy
d) Thermal energy

Answer
b) Potential energy

The work-energy principle states that the work done on an object is equal to the change in its:
a) Kinetic energy
b) Potential energy
c) Total energy
d) Mechanical energy

Answer
c) Total energy

The energy possessed by an object due to its motion is called:
a) Potential energy
b) Kinetic energy
c) Mechanical energy
d) Thermal energy

Answer
b) Kinetic energy

The energy stored in a stretched or compressed spring is an example of:
a) Kinetic energy
b) Potential energy
c) Mechanical energy
d) Elastic energy

Answer
b) Potential energy

The conservation of energy principle states that energy cannot be created or destroyed, only:
a) Transformed from one form to another
b) Doubled or halved
c) Lost as heat
d) Stored indefinitely

Answer
a) Transformed from one form to another

The work done by a force on an object can be calculated by multiplying the force and the displacement in the direction of the force, only when the force and displacement are:
a) Perpendicular to each other
b) Parallel to each other
c) Opposite in direction
d) Equal in magnitude

Answer
b) Parallel to each other

Which of the following energy forms is associated with the motion of molecules and atoms?
a) Kinetic energy
b) Potential energy
c) Thermal energy
d) Nuclear energy

Answer
c) Thermal energy

A force does work on an object when there is a displacement of the object in the direction of the:
a) Force
b) Weight
c) Gravity
d) Acceleration

Answer
a) Force

The mechanical energy of an object is the sum of its:
a) Kinetic energy and potential energy
b) Thermal energy and potential energy
c) Kinetic energy and thermal energy
d) Potential energy and electrical energy

Answer
a) Kinetic energy and potential energy

The potential energy of an object at a certain height above the ground depends on its:
a) Acceleration
b) Mass
c) Velocity
d) Volume

Answer
b) Mass

The unit of power is:
a) Newton
b) Pascal
c) Joule
d) Watt

Answer
d) Watt

What is the power of a machine that does 1000 joules of work in 10 seconds?
a) 10 W
b) 100 W
c) 1000 W
d) 10,000 W

Answer
c) 1000 W

The work done on an object is negative when the force and displacement are:
a) Perpendicular to each other
b) Parallel to each other
c) In opposite directions
d) Equal in magnitude

Answer
c) In opposite directions

Which law states that energy cannot be created or destroyed, only converted from one form to another?
a) Newton’s second law of motion
b) Ohm’s law
c) Hooke’s law
d) Law of conservation of energy

Answer
d) Law of conservation of energy

A machine requires 4000 joules of work to lift an object. If the machine’s efficiency is
80%, how much energy does it waste?
a) 800 joules
b) 1000 joules
c) 3200 joules
d) 4000 joules

Answer
a) 800 joules

What is the efficiency of a machine that performs 120 joules of useful work while 200 joules of input energy are supplied to it?
a) 0.4
b) 0.6
c) 1.2
d) 1.7

Answer
b) 0.6

The energy stored in the chemical bonds of a substance is known as:
a) Nuclear energy
b) Chemical energy
c) Mechanical energy
d) Magnetic energy

Answer
b) Chemical energy

The total mechanical energy of an object remains constant if:
a) Only kinetic energy changes
b) Only potential energy changes
c) Neither kinetic nor potential energy changes
d) Both kinetic and potential energy change

Answer
c) Neither kinetic nor potential energy changes

Which form of energy is associated with the movement of charged particles?
a) Kinetic energy
b) Electrical energy
c) Potential energy
d) Magnetic energy

Answer
b) Electrical energy

The amount of work done on an object is equal to the area under the:
a) Force-time graph
b) Force-displacement graph
c) Force-velocity graph
d) Force-acceleration graph

Answer
b) Force-displacement graph

The mechanical energy of an object in free fall increases as it:
a) Falls faster
b) Falls slower
c) Reaches the ground
d) Ascends

Answer
d) Ascends

The total energy of a closed system, which includes both kinetic and potential energies, is called:
a) Mechanical energy
b) Thermal energy
c) Chemical energy
d) Electrical energy

Answer
a) Mechanical energy

What is the work done by a force of 20 N on an object that displaces 5 meters in the direction of the force?
a) 5 J
b) 10 J
c) 20 J
d) 100 J

Answer
c) 20 J

A car is brought to a stop from a certain speed. Its kinetic energy is converted into:
a) Potential energy
b) Thermal energy
c) Chemical energy
d) Electrical energy

Answer
b) Thermal energy

The law of conservation of energy is a consequence of:
a) Newton’s first law of motion
b) Newton’s second law of motion
c) The work-energy principle
d) Pascal’s law

Answer
c) The work-energy principle

Which energy transformation takes place when we switch on a light bulb?
a) Electrical energy to thermal energy
b) Thermal energy to electrical energy
c) Electrical energy to light energy
d) Light energy to electrical energy

Answer
c) Electrical energy to light energy

The ability of a machine to do work compared to the amount of work put into the machine is known as its:
a) Capacity
b) Efficiency
c) Power
d) Load

Answer
b) Efficiency

The energy possessed by an object at rest is called:
a) Kinetic energy
b) Potential energy
c) Mechanical energy
d) Thermal energy

Answer
b) Potential energy

The amount of work done on an object can be calculated by multiplying the force and the displacement in the direction of the force, only when the force is:
a) Constant
b) Changing
c) Zero
d) Negative

Answer
a) Constant

A ball is thrown vertically upward. At the highest point of its trajectory, its kinetic energy is:
a) Maximum
b) Minimum
c) Zero
d) Equal to its potential energy

Answer
c) Zero

The work-energy principle is a specific case of which more general principle in physics?
a) The law of conservation of energy
b) Newton’s first law of motion
c) Newton’s second law of motion
d) Pascal’s law

Answer
a) The law of conservation of energy

Which type of energy transformation occurs when a violin string is plucked and sound is produced?
a) Mechanical energy to electrical energy
b) Potential energy to kinetic energy
c) Electrical energy to sound energy
d) Chemical energy to thermal energy

Answer
b) Potential energy to kinetic energy

The energy associated with the motion of an object is transferred from one object to another during a(n):
a) Elastic collision
b) Inelastic collision
c) Explosion
d) Impulse

Answer
a) Elastic collision

What is the potential energy of an object with a mass of 5 kg at a height of 10 meters above the ground? (Acceleration due to gravity = 9.8 m/s²)
a) 49 J
b) 98 J
c) 245 J
d) 490 J

Answer
d) 490 J

The rate at which work is done or energy is transferred is known as:
a) Work
b) Power
c) Energy
d) Efficiency

Answer
b) Power

A force of 50 N is applied to an object, but the object does not move. How much work is done on the object?
a) 0 J
b) 25 J
c) 50 J
d) 100 J

Answer
a) 0 J

The principle that states “energy can neither be created nor destroyed” is known as:
a) Ohm’s law
b) Hooke’s law
c) Pascal’s law
d) The law of conservation of energy

Answer
d) The law of conservation of energy

The amount of work done on an object is zero when the angle between the force and displacement is:
a) 0 degrees
b) 45 degrees
c) 90 degrees
d) 180 degrees

Answer
c) 90 degrees

The potential energy stored in a spring is an example of:
a) Elastic potential energy
b) Gravitational potential energy
c) Chemical potential energy
d) Nuclear potential energy

Answer
a) Elastic potential energy

Which energy transformation takes place when we switch on a television?
a) Electrical energy to thermal energy
b) Chemical energy to electrical energy
c) Electrical energy to sound energy
d) Electrical energy to light energy

Answer
d) Electrical energy to light energy

Which of the following statements is true regarding the work-energy principle?
a) It only applies to conservative forces
b) It is not applicable to non-conservative forces
c) It holds true for all forces regardless of their nature
d) It only applies to frictional forces

Answer
c) It holds true for all forces regardless of their nature

A machine is said to be 100% efficient when:
a) It does not require any energy input
b) All its energy input is converted to useful work
c) It is operating at its maximum capacity
d) It is operating at its minimum capacity

Answer
b) All its energy input is converted to useful work

What is the gravitational potential energy of an object with a mass of 2 kg at a height of
5 meters above the ground? (Acceleration due to gravity = 9.8 m/s²)
a) 19.6 J
b) 39.2 J
c) 98 J
d) 196 J

Answer
d) 196 J

The work done on an object can be positive, negative, or zero depending on the angle between the force and the:
a) Weight of the object
b) Displacement of the object
c) Mass of the object
d) Acceleration of the object

Answer
b) Displacement of the object

The energy possessed by an object due to its position above the ground is called:
a) Kinetic energy
b) Potential energy
c) Mechanical energy
d) Thermal energy

Answer
b) Potential energy

A car is moving at a constant speed. Which of the following statements is true regarding its kinetic energy?
a) Its kinetic energy is increasing
b) Its kinetic energy is decreasing
c) Its kinetic energy is constant
d) Its kinetic energy is zero

Answer
c) Its kinetic energy is constant

The total mechanical energy of an object is zero when:
a) Only kinetic energy is zero
b) Only potential energy is zero
c) Both kinetic and potential energies are zero
d) Neither kinetic nor potential energy is zero

Answer
c) Both kinetic and potential energies are zero

A 60 W light bulb is left on for 5 hours. How much energy does it consume?
a) 3 J
b) 300 J
c) 3000 J
d) 18000 J

Answer
d) 18000 J

Which of the following is a non-conservative force that always does negative work?
a) Gravity
b) Friction
c) Tension
d) Elastic force

Answer
b) Friction

The energy associated with the position of an object relative to the surface of the Earth is known as:
a) Elastic potential energy
b) Gravitational potential energy
c) Chemical potential energy
d) Nuclear potential energy

Answer
b) Gravitational potential energy

The ability to do work or cause a change is the definition of:
a) Energy
b) Power
c) Force
d) Momentum

Answer
a) Energy

The energy possessed by an object due to its motion in a circular path is called:
a) Centripetal energy
b) Centrifugal energy
c) Rotational energy
d) Circular energy

Answer
c) Rotational energy

A machine has an input work of 200 J and an output work of 160 J. What is the efficiency of the machine?
a) 0.2
b) 0.6
c) 0.8
d) 1.0

Answer
b) 0.8

A rock is thrown vertically upward. At the highest point of its trajectory, its potential energy is:
a) Maximum
b) Minimum
c) Zero
d) Equal to its kinetic energy

Answer
c) Zero

The energy possessed by an object due to its position in a magnetic field is called:
a) Magnetic energy
b) Potential energy
c) Kinetic energy
d) Electrical energy

Answer
a) Magnetic energy

An object with a mass of 10 kg is lifted to a height of 2 meters above the ground. What is its gravitational potential energy? (Acceleration due to gravity = 9.8 m/s²)
a) 19.6 J
b) 39.2 J
c) 98 J
d) 196 J

Answer
d) 196 J

The principle of conservation of energy can be explained by which of the following laws?
a) Newton’s first law of motion
b) Newton’s second law of motion
c) Newton’s third law of motion
d) The law of conservation of momentum

Answer
d) The law of conservation of momentum

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