Energy - ICSE STD 7 PHYSICS Questions

Q 1MCQ1 Mark

According to law of conservation of energy, energy changes from one form to another form, but the total energy of that system

A
increases
B
decreases
C
alternates
✓
remains the same

Answer: D.

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Q 2MCQ1 Mark

The correct statement is

✓
Both work and energy have the same units
B
Potential energy of a body is due to its motion
C
Kinetic energy of a body is due to its position or state
D
Kinetic energy can change into potential energy, but potential energy cannot change into kinetic energy.

Answer: A.

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Q 3MCQ1 Mark

When a bulb lights up on passing current, the change of energy is

A
from electrical energy to heat energy
B
from electrical energy to light energy
✓
from electrical energy to heat and light energy
D
from electrical energy to mechanical energy.

Answer: C.

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Q 4MCQ1 Mark

The energy stored in an electric cell is

✓
chemical energy
B
electrical energy
C
heat energy
D
mechanical energy.

Answer: A.

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Q 5MCQ1 Mark

A ball rolling on the ground possesses

✓
kinetic energy
B
potential energy
C
no energy
D
heat energy

Answer: A.

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Q 6[1 Mark Question Answer]1 Mark

Give one example of a body that has potential energy, due to its position at a height.

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Q 7[1 Mark Question Answer]1 Mark

What are the two kinds of mechanical energy.

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Q 8[1 Mark Question Answer]1 Mark

A ball is made to fall freely from a height. State the kind/ kinds of energy possessed by the ball when it is at the ground.

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Q 9[1 Mark Question Answer]1 Mark

A ball is made to fall freely from a height. State the kind/ kinds of energy possessed by the ball when it is just in the middle .

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Q 10[1 Mark Question Answer]1 Mark

A ball is made to fall freely from a height. State the kind/ kinds of energy possessed by the ball when it is at the highest point .

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Q 11[2 Mark Question Answer]2 Marks

A bucket full of water .is on the first floor of your house and another identical bucket with same quantity of water is kept on the second floor. Which of the two has greater potential energy ?

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Q 12[2 Mark Question Answer]2 Marks

Two bodies A and B of masses 10 kg and 20 kg respectively are at the same height above the ground. Which of the two has the greater potential energy ?

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Q 13[2 Mark Question Answer]2 Marks

State two factors on which the potential energy of a body at a certain height above the ground depends.

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Q 14[2 Mark Question Answer]2 Marks

Give one example of a body that has potential energy, in due to its state.

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Q 15[2 Mark Question Answer]2 Marks

What is potential energy ? State its unit.

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Q 16[3 Mark Question Answer]3 Marks

What do you mean by conservation of mechanical energy? State the condition when does it hold.

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Q 17[3 Mark Question Answer]3 Marks

State the unit of energy and define it.

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Q 18[3 Mark Question Answer]3 Marks

Energy can exist in several forms and may change from one form to another. Give two examples to show the conversion of energy from one form to another.

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Q 19[3 Mark Question Answer]3 Marks

Can a body possess energy even when it is not in motion ? Explain your answer with an example.

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Q 20[3 Mark Question Answer]3 Marks

Define the term kinetic energy. Give one example of a body which possesses kinetic energy.

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Q 21[5 Mark Question Answer]5 Marks

Name five different forms of energy.

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Q 22[5 Mark Question Answer]5 Marks

State the changes in form of energy while producing hydro electricity.