Welcome to the 11th Class Physics Chapter 4 MCQs Practice and Quiz Tests. We are presenting you with top MCQ questions from the 11th Class Physics Chapter 4 Work and Energy.
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Work is defined as the product of:
a) Force and distance
b) Mass and velocity
c) Energy and time
d) Power and displacement
The SI unit of work is:
a) Watt
b) Newton
c) Joule
d) Pascal
Kinetic energy depends on an object’s:
a) Mass and velocity
b) Height and velocity
c) Weight and displacement
d) Force and time
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
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
The energy possessed by an object due to its motion is called:
a) Potential energy
b) Kinetic energy
c) Mechanical energy
d) Thermal 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
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
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
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
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
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
The potential energy of an object at a certain height above the ground depends on its:
a) Acceleration
b) Mass
c) Velocity
d) Volume
The unit of power is:
a) Newton
b) Pascal
c) Joule
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
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
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
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
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
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
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
Which form of energy is associated with the movement of charged particles?
a) Kinetic energy
b) Electrical energy
c) Potential energy
d) Magnetic 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
The mechanical energy of an object in free fall increases as it:
a) Falls faster
b) Falls slower
c) Reaches the ground
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
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
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
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
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
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
The energy possessed by an object at rest is called:
a) Kinetic energy
b) Potential energy
c) Mechanical energy
d) Thermal 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
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
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
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
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
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
The rate at which work is done or energy is transferred is known as:
a) Work
b) Power
c) Energy
d) Efficiency
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
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
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
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
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
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
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
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
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
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
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
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
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
Which of the following is a non-conservative force that always does negative work?
a) Gravity
b) Friction
c) Tension
d) Elastic force
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
The ability to do work or cause a change is the definition of:
a) Energy
b) Power
c) Force
d) Momentum
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
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
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
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
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
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
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