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PHYSICS [1 Mark Question Answer]

Energy · ICSE STD 7 (ICSE - English Medium). 22 questions.

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[1 Mark Question Answer]

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22 questions · timed · auto-graded

Question 11 Mark
Give one example of a body that has potential energy, due to its position at a height.
Answer
P.E. due to its position at a height:
Water at height has P.E. stored in it. Falling water from a height can be used to do work like turning a wheel.
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Question 21 Mark
What are the two kinds of mechanical energy.
Answer
The mechanical energy is found in two forms namely :
(a) The potential energy, and (b) The kinetic energy.
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Question 31 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.
Answer
Kinetic energy.
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Question 41 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 .
Answer
Potential energy + Kinetic energy.
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Question 51 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 .
Answer
Potential energy.
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Question 61 Mark
Give one example to show that the sum of potential energy and kinetic energy remains constant if friction is ignored.
Answer
During the vertical fall of ball, if friction due to air is neglected, the total sum of potential energy and kinetic energy at each point of its path remains same.
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Question 71 Mark
Give one relevant example for the following transformation of energy :
Chemical energy to light energy.
Answer
Fire crackers burst
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Question 81 Mark
Give one relevant example for the following transformations of energy:
Chemical energy to heat energy.
Answer
Burning of wood, coal etc.
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Question 91 Mark
Give one relevant example for the following transformation of energy :
Electrical energy to light energy.
Answer
Tube light of bulbs.
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Question 101 Mark
Give one relevant example for the following transformation of energy:
Electrical energy to mechanical energy.
Answer
An electric generator.
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Question 111 Mark
Give one relevant example for the following transformation of energy:
Electrical energy to heat energy.
Answer
In an electric heater, oven, geyser, toaster etc., the electrical energy changes into heat energy.
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Question 121 Mark
State the energy changes that occur in the following :
An electric generator (or dynamo).
Answer
Electrical energy change into mechanical energy.
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Question 131 Mark
State the energy changes that occur in the following :
Lighting of a torch bulb.
Answer
Chemical energy into light and heat energy.
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Question 141 Mark
State the energy changes that occur in the following :
Burning coal while operating a steam engine.
Answer
Chemical energy of coal changes to heat energy of the steam. Heat energy changes into mechanical energy.
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Question 151 Mark
State the energy changes that occur in the following :
The unwinding of a watch spring.
Answer
Potential energy to kinetic energy.
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Question 161 Mark
Name the type of energy (kinetic or potential) possessed by the following:
A stretched rubber band.
Answer
Potential energy.
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Question 171 Mark
Name the type of energy (kinetic or potential) possessed by the following:
Water flowing in a river.
Answer
Water Flowing in a River possesses Kinetic energy due to motion.
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Question 181 Mark
Name the type of energy (kinetic or potential) possessed by the following:
A bullet fired from a gun.
Answer
Kinetic energy.
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Question 191 Mark
Name the type of energy (kinetic or potential) possessed by the following:
A moving bus.
Answer
Kinetic energy.
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Question 201 Mark
Name the type of energy (kinetic or potential) possessed by the following:
A compressed spring.
Answer
Potential energy.
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Question 211 Mark
Name the type of energy (kinetic or potential) possessed by the following:
A stone at rest on the top of a building.
Answer
Potential energy.
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Question 221 Mark
Name the type of energy (kinetic or potential) possessed by the following:
A moving cricket ball.
Answer
Kinetic energy.
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[1 Mark Question Answer] - PHYSICS STD 7 Questions - Vidyadip