Conservation of Energy — Homi Bhabha Class 6 Physics MCQs with Solutions
Free Homi Bhabha Class 6 Physics Conservation of Energy MCQs with step-by-step solutions (10 questions). Part of Force, Work, and Energy. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — 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.
Q2 — 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.
Q3 — 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.
Q4 — 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.
Q5 — Conservation of Energy · medium · theory
On a moving swing, at its highest point the swing has mostly ___.
A. Potential energy ✓ Correct
B. Electrical energy
C. Kinetic energy
D. Sound energy
Solution: At the highest point the swing is highest and momentarily still, so its energy is stored as potential energy.
Q6 — Conservation of Energy · medium · theory
As a swing comes down from its highest point, its potential energy changes into ___.
A. Kinetic energy ✓ Correct
B. Light energy
C. Chemical energy
D. Sound energy
Solution: As the swing falls, the stored potential energy turns into kinetic energy of motion.
Q7 — Conservation of Energy · medium · theory
In our body, the chemical energy from food is changed mainly into ___.
A. Only sound energy
B. Only electrical energy
C. Only light energy
D. Energy of movement and heat ✓ Correct
Solution: The body changes food energy into movement and heat, which lets us run and play.
Q8 — Conservation of Energy · medium · theory
A loudspeaker changes electrical energy into ___.
A. Potential energy
B. Light energy
C. Chemical energy
D. Sound energy ✓ Correct
Solution: A loudspeaker turns electrical energy into sound energy that we hear.
Q9 — 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.
Q10 — 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.