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question_answer1)
The capacity to do work is called
A)
force. done
clear
B)
energy. done
clear
C)
machine. done
clear
D)
movement. done
clear
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question_answer2)
The following diagram shows a man pushing a table.
Now the man is applying ____ on the table.
A)
work done
clear
B)
force done
clear
C)
energy done
clear
D)
muscles done
clear
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question_answer3)
If Ravi is able to move the table through a distance, then ____ is said to be done.
A)
work done
clear
B)
force done
clear
C)
energy done
clear
D)
muscles done
clear
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question_answer4)
To do work, we need
A)
force. done
clear
B)
energy. done
clear
C)
hands. done
clear
D)
muscles. done
clear
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question_answer5)
Which of the following requires more energy?
A)
B)
C)
D)
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question_answer6)
When we throw a ball into air, it falls back. The force responsible for this is
A)
muscular force. done
clear
B)
gravitational force. done
clear
C)
mechanical force. done
clear
D)
none of these done
clear
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question_answer7)
A football kicked by a boy rolls on the ground to some distance and stops. The force which stops the ball is
A)
muscular force. done
clear
B)
gravitational force. done
clear
C)
mechanical force. done
clear
D)
frictional force. done
clear
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question_answer8)
An electric heater converts
A)
heat energy to electrical energy. done
clear
B)
electrical energy to heat energy. done
clear
C)
light energy to electrical energy. done
clear
D)
electrical energy to muscular energy. done
clear
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question_answer9)
In a battery cell, energy is stored in the form of
A)
electrical energy. done
clear
B)
muscular energy. done
clear
C)
chemical energy. done
clear
D)
solar energy. done
clear
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question_answer10)
The given transformation takes place in
A)
electric bulb. done
clear
B)
electric heater. done
clear
C)
battery cell. done
clear
D)
solar cell. done
clear
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question_answer11)
Which of the following activities would need energy the most?
A)
Riding a bicycle up a hill done
clear
B)
Walking done
clear
C)
Riding a bicycle on a level ground done
clear
D)
Doing homework done
clear
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question_answer12)
Match the following devices in Column - I with their energy transformations Column - II correctly.
Column - I | Column - II |
p. | Electric fan | i. | Electrical to light and sound |
q. | Electric bulb | ii. | Chemical to electrical |
r. | Petrol engine | iii. | Electrical to mechanical |
s. | Television | iv. | Electrical to light |
t. | Battery | V | Chemical to mechanical |
A)
\[p-i,q-iv,r-v,s-iii,t-ii\] done
clear
B)
\[p-v,\text{ }q-iii,\text{ }r-i,\text{ }s-ii,\text{ }t-iv\] done
clear
C)
\[p-iii,q-iv,r-v,s-i,t-ii\] done
clear
D)
\[p-iv,\text{ }q-iii,\text{ }r-i,\text{ }s-v,\text{ }t-ii\] done
clear
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question_answer13)
The ultimate source of our energy is
A)
the sun. done
clear
B)
coal. done
clear
C)
wind. done
clear
D)
plants. done
clear
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question_answer14)
Radha pushed a heavy table but failed to move it. Which of the following is TRUE of the above statement?
A)
Energy is not spent but work is done. done
clear
B)
Energy is spent but work is not done. done
clear
C)
Energy is not spent and work is not done. done
clear
D)
Energy is spent and work is done. done
clear
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question_answer15)
Which of the following statements is NOT true?
A)
Machines make work easy. done
clear
B)
Machines increase the speed of doing work. done
clear
C)
Machines change the direction of force done
clear
D)
Machines produce energy. done
clear
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question_answer16)
What are you exerting when you push or pull an object?
A)
Force done
clear
B)
Matter done
clear
C)
Motion done
clear
D)
Mass done
clear
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question_answer17)
Which of the following statements is NOT true?
A)
Friction makes a moving object slow down and stop. done
clear
B)
Friction between two surfaces will produce heat. done
clear
C)
Friction enables an object to stay in a stationary position. done
clear
D)
Friction decreases if roughness of an object increases. done
clear
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question_answer18)
Which of the following energies can be replenished?
A)
Solar energy done
clear
B)
Wind energy done
clear
C)
Water energy done
clear
D)
All of these done
clear
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question_answer19)
In which of the following activities is force used for pulling?
A)
Blowing air into a balloon done
clear
B)
Cycling done
clear
C)
Stretching a rubber band done
clear
D)
All of the above done
clear
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question_answer20)
Which energy conversion takes place during photosynthesis?
A)
Heat energy \[\to \] Light energy done
clear
B)
Light energy \[\to \] Heat energy done
clear
C)
Light energy \[\to \] Chemical energy done
clear
D)
Mechanical energy \[\to \] Chemical energy done
clear
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question_answer21)
The energy used for cycling comes from
A)
the chemical energy of food. done
clear
B)
the heat energy of our body. done
clear
C)
sound energy. done
clear
D)
light energy. done
clear
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question_answer22)
X enables work to be done. There are many forms of X. What is X?
A)
Energy done
clear
B)
The Sun done
clear
C)
Heat done
clear
D)
Sound done
clear
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question_answer23)
The figure given below shows a ball remaining stationary on the floor.
What force enables the ball to remain in that position?
A)
Pushing done
clear
B)
Frictional done
clear
C)
Magnetic done
clear
D)
Pulling done
clear
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question_answer24)
The box below does NOT move because
A)
both forces A and B are acting in opposite directions. done
clear
B)
both forces A and B are acting in same direction. done
clear
C)
there is no frictional force between the box and the ground done
clear
D)
None of these. done
clear
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question_answer25)
Work is done when you
A)
kick a foot ball. done
clear
B)
hammer a nail. done
clear
C)
push a door. done
clear
D)
All of the above. done
clear
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question_answer26)
Energy can be defined as
A)
the capacity to do work. done
clear
B)
work done in unit time. done
clear
C)
a push or a pull. done
clear
D)
attraction between two oppositely charged particles. done
clear
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question_answer27)
Which of the following is NOT a source of energy
A)
The sun. done
clear
B)
Wind. done
clear
C)
Water. done
clear
D)
Gravity. done
clear
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question_answer28)
A football kicked by a boy rolls on the ground to some distance and stops. The force which stops the ball is
A)
muscular force. done
clear
B)
gravitational force. done
clear
C)
mechanical force. done
clear
D)
frictional force. done
clear
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question_answer29)
A stone thrown upwards comes down because of
A)
mechanical energy. done
clear
B)
kinetic energy of the stone. done
clear
C)
wind energy. done
clear
D)
gravitational force of the earth. done
clear
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question_answer30)
In which of the following cases do you have to do more work?
A)
Pushing a heavy table done
clear
B)
Kicking a ball done
clear
C)
Stopping a rolling ball done
clear
D)
Pushing a cart done
clear
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question_answer31)
The force which pulls a body towards the earth is called
A)
friction. done
clear
B)
gravity. done
clear
C)
tension. done
clear
D)
collision. done
clear
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question_answer32)
Which of these comes from the sun?
A)
Solar energy done
clear
B)
Thermal energy done
clear
C)
Atomic energy done
clear
D)
Geo-thermal energy done
clear
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question_answer33)
Work is said to be done when ______ produces displacement of a body.
A)
force done
clear
B)
energy done
clear
C)
distance done
clear
D)
speed done
clear
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question_answer34)
Study the energy transformation shown here. In which of the following cases is this taking place?
A)
Glowing of an electric torch. done
clear
B)
Photosynthesis in plants. done
clear
C)
Generation of electricity in windmills. done
clear
D)
Burning of wood done
clear
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question_answer35)
Which energy is present in the objects given below?
A)
Muscular energy done
clear
B)
Solar energy done
clear
C)
Chemical energy done
clear
D)
Heat energy done
clear
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question_answer36)
When a pin wheel is placed against wind, it begins to spin. This proves that
A)
moving air has energy done
clear
B)
pin wheel has life done
clear
C)
pin has energy done
clear
D)
moving air has no energy. done
clear
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question_answer37)
What form of energy can be obtained from the sun?
i- Light |
ii- Heat |
iii-Sound |
A)
Only I and II done
clear
B)
Only I and III done
clear
C)
Only II and III done
clear
D)
I, II and III done
clear
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question_answer38)
What is the energy change that takes place when an electric bulb is switched on?
A)
Electrical energy is converted in to heat and light energy. done
clear
B)
Electrical energy is converted into chemical energy. done
clear
C)
Electrical energy is converted into sound energy. done
clear
D)
Electrical energy is converted into mechanical energy. done
clear
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question_answer39)
What is the energy change that takes place when television is switched on?
A)
Electrical energy is converted to heat and light energy. done
clear
B)
Electrical energy is converted to chemical energy. done
clear
C)
Electrical energy is converted to light and sound energy. done
clear
D)
Electrical energy is converted into mechanical energy. done
clear
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question_answer40)
In which of the following electrical energy is used to heat substances?
A)
Microwave oven done
clear
B)
Radio done
clear
C)
Television done
clear
D)
Fan done
clear
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