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Force, Work, and Energy — Homi Bhabha Class 6 Physics MCQs with Solutions
Free Homi Bhabha Class 6 Physics Force, Work, and Energy MCQs with step-by-step solutions covering Types of Forces, Simple Machines, Forms of Energy, Conservation of Energy. Practise online on Prepizo — no login needed.
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Sample questions with solutions
Q1 — Types of Forces · easy · theory
In science, a force is best described as a ___.
A. Only a pull
B. Only a push
C. A push or a pull ✓ Correct
D. A kind of stored energy
Solution: A force is any push or a pull acting on an object.
Q2 — Types of Forces · easy · theory
You use your arms to lift a heavy school bag. The force you use is called ___.
A. Magnetic force
B. Muscular force ✓ Correct
C. Friction
D. Gravitational force
Solution: Lifting a bag with your muscles is an example of muscular force.
Q3 — Types of Forces · easy · theory
When you let go of a ball, it falls down to the ground because of ___.
A. Gravity ✓ Correct
B. Friction
C. Magnetism
D. Muscular force
Solution: Objects fall down because the Earth pulls them with the force of gravity.
Q4 — Types of Forces · easy · theory
A ball rolling on the ground slowly stops on its own. The force that slows it down is ___.
A. Gravity
B. Muscular force
C. Friction ✓ Correct
D. Magnetic force
Solution: Friction acts opposite to motion and slowly stops the rolling ball.
Q5 — Simple Machines · easy · theory
A simple machine helps us to ___.
A. Create new energy
B. Destroy energy
C. Stop all forces
D. Do work more easily ✓ Correct
Solution: Simple machines make our work easier; they do not create energy.
Q6 — Simple Machines · easy · theory
A seesaw in a park is an example of a ___.
A. Screw
B. Lever ✓ Correct
C. Wedge
D. Pulley
Solution: A seesaw turns about a fixed point in the middle, so it works as a lever.
Q7 — Simple Machines · easy · theory
A slanting ramp used to push a heavy box up onto a truck is an example of an ___.
A. Inclined plane ✓ Correct
B. Wheel and axle
C. Pulley
D. Lever
Solution: A ramp is a slanting flat surface, which is an inclined plane.
Q8 — Simple Machines · easy · theory
Which simple machine is commonly used to lift a bucket of water up from a well?
A. Wedge
B. Screw
C. Pulley ✓ Correct
D. Inclined plane
Solution: A pulley placed over the well lets us lift the bucket easily.
Q9 — Forms of Energy · easy · theory
Energy is the ability to ___.
A. Make forces disappear
B. Do work ✓ Correct
C. Stop all work
D. Create matter
Solution: Energy is the ability to do work.
Q10 — Forms of Energy · easy · theory
A moving car has a form of energy called ___.
A. Only chemical energy
B. Kinetic energy ✓ Correct
C. Only stored energy
D. No energy at all
Solution: The energy of any moving object is called kinetic energy.
Q11 — Forms of Energy · easy · theory
The Sun mainly gives the Earth ___.
A. Sound energy
B. Muscular energy
C. Light and heat energy ✓ Correct
D. Magnetic energy
Solution: The Sun sends us mainly light and heat energy.
Q12 — Forms of Energy · easy · theory
The energy stored inside the food we eat is called ___.
A. Magnetic energy
B. Chemical energy ✓ Correct
C. Light energy
D. Sound energy
Solution: Food stores chemical energy, which our body uses.
Q13 — Conservation of Energy · easy · theory
According to the law of conservation of energy, energy can ___.
A. Be created from nothing
B. Disappear forever
C. Only change from one form to another ✓ Correct
D. Be destroyed completely
Solution: Energy is never created or destroyed; it only changes from one form to another.
Q14 — Conservation of Energy · easy · theory
In a torch, the chemical energy of the cell is finally changed mainly into ___.
A. Light energy ✓ Correct
B. Sound energy
C. Muscular energy
D. Magnetic energy
Solution: In a torch, the chemical energy of the cell becomes electrical energy and finally light energy.
Q15 — Conservation of Energy · easy · theory
When wood burns, the chemical energy stored in it changes mainly into ___.
A. Magnetic energy
B. Heat and light energy ✓ Correct
C. Electrical energy
D. Sound energy
Solution: Burning wood releases its stored chemical energy as heat and light.
Q16 — Conservation of Energy · easy · theory
The total amount of energy in the universe ___.
A. Keeps increasing
B. Keeps decreasing
C. Always stays the same ✓ Correct
D. Slowly becomes zero
Solution: Because energy is only changed and never lost, the total energy always stays the same.
Q17 — Types of Forces · hard · theory
Two children push a box from opposite sides with equal force, and the box does not move. The two forces are ___.
A. Non-contact
B. Magnetic
C. Balanced ✓ Correct
D. Gravitational
Solution: Equal and opposite forces cancel each other, so these balanced forces keep the box still.
Q18 — Types of Forces · hard · theory
Why is it harder to slide a box across a rough floor than across a smooth floor?
A. A rough floor produces more friction ✓ Correct
B. A rough floor has more gravity
C. A rough floor has no force at all
D. A smooth floor produces more friction
Solution: A rough floor has more friction, so more force is needed to slide the box.
Q19 — Simple Machines · hard · theory
Why is it easier to move a heavy load up a ramp than to lift it straight up?
A. The ramp reduces the effort (force) needed ✓ Correct
B. The ramp removes gravity
C. The ramp adds energy to the load
D. The ramp makes the load weigh less
Solution: A ramp lets you use a smaller force over a longer distance, so less effort is needed. The weight of the load does not change.
Q20 — Simple Machines · hard · theory
Which of these is NOT a simple machine?
A. A pulley
B. An electric motor ✓ Correct
C. An inclined plane
D. A lever
Solution: An electric motor is a complex machine; a lever, pulley and inclined plane are simple machines.
Q21 — Forms of Energy · hard · theory
Two cars are moving on a road. The car that moves faster has ___.
A. No kinetic energy
B. Less kinetic energy
C. Only potential energy
D. More kinetic energy ✓ Correct
Solution: The faster an object moves, the more kinetic energy it has.
Q22 — Forms of Energy · hard · theory
An electric fan mainly changes electrical energy into ___.
A. Only magnetic energy
B. Chemical energy
C. The moving (kinetic) energy of its blades ✓ Correct
D. Only light energy
Solution: The fan changes electrical energy into the movement of the blades, which is kinetic energy.
Q23 — Conservation of Energy · hard · theory
A ball is dropped from a height. As it falls towards the ground, its ___.
A. Energy is created from nothing
B. Potential energy changes into kinetic energy ✓ Correct
C. Energy is destroyed
D. Kinetic energy changes into potential energy
Solution: As the ball falls, its potential energy keeps changing into kinetic energy.
Q24 — Conservation of Energy · hard · theory
A solar panel on a rooftop mainly changes ___.
A. Heat energy into sound energy
B. Chemical energy into magnetic energy
C. Sound energy into light energy
D. Light energy into electrical energy ✓ Correct
Solution: A solar panel changes light energy from the Sun into electrical energy.
Q25 — Types of Forces · medium · theory
Which force can act between two objects even without them touching each other?
A. Friction
B. Magnetic force ✓ Correct
C. A push from your hand
D. Muscular force
Solution: Magnetic force is a non-contact force, so it acts even without touching.
Q26 — Types of Forces · medium · theory
A magnet pulls an iron nail towards it from a small distance. This kind of force is called a ___ force.
A. Non-contact ✓ Correct
B. Contact
C. Friction
D. Muscular
Solution: A force that acts from a distance without touching is a non-contact force.
Q27 — Types of Forces · medium · theory
Which one of these is a contact force?
A. Friction ✓ Correct
B. Magnetic force
C. Electrostatic force
D. Gravity
Solution: Friction acts only when two surfaces touch, so it is a contact force.
Q28 — Types of Forces · medium · theory
Rubbing a plastic comb on dry hair lets it pick up small bits of paper. The force acting here is ___.
A. Gravity
B. Magnetic force
C. Electrostatic force ✓ Correct
D. Muscular force
Solution: Rubbing builds up static charge, and this electrostatic force attracts the paper bits.
Q29 — Simple Machines · medium · theory
The sharp cutting edge of a knife or an axe works as a ___.
A. Screw
B. Wedge ✓ Correct
C. Lever
D. Pulley
Solution: A wedge has a sharp edge that is used to cut or split things.
Q30 — Simple Machines · medium · theory
The spiral threads on a bottle cap or a jar lid make it a kind of ___.
A. Lever
B. Pulley
C. Wedge
D. Screw ✓ Correct
Solution: The spiral threads make a bottle cap work like a screw.