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Question-1
Spikes are provided in the shoes of athlete:
(A)
For decoration
(B)
To increase friction
(C)
To decrease friction
(D)
None of the above
Question-2
In which of the following cases more friction is desirable?
(A)
Movement of piston in a cylinder
(B)
Braking of a vehicle
(C)
Running on a track
(D)
All of the above
Question-3
Which of the following statement is TRUE?
(A)
Static friction is more than dynamic friction
(B)
Static friction is less than dynamic friction
(C)
Static friction is equal to dynamic friction
(D)
There is no relationship between static and dynamic friction
Question-4
With increase in weight of a body the limiting friction
(A)
Increases
(B)
Decreases
(C)
Does not change
(D)
First increases and then decreases
Question-5
The frictional force exerted by fluids is called:
(A)
Lift
(B)
Drag
(C)
Rolling friction
(D)
Dynamic friction
Question-6
Friction reduces efficiency of machines due to:
(A)
Production of heat
(B)
Wearing out of moving parts
(C)
Increase in energy consumption
(D)
All of the above
Question-7
The surface of the head of a match stick and sides of a match box are deliberately made rough to:
(A)
Increase friction
(B)
Decrease friction
(C)
Increase amount
(D)
Decrease amount of heat
Question-8
Friction is a force and it is measured in units called
(A)
Kilograms
(B)
Newtons
(C)
Mass
(D)
Weight
Question-9
Friction is force. How is friction caused?
(A)
One surface moving
(B)
Two surfaces being pushed together
(C)
Two surfaces being rubbed together
(D)
Two surface being pulled apart
Question-10
Friction is a type of:
(A)
contact force
(B)
non contact force
(C)
resistance force
(D)
motion
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Std 7
Kerala (English Medium)
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