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Question-1
For two surface which of the following has highest magnitude.
(A)
Static friction
(B)
Limiting friction
(C)
Dynamic friction
(D)
Sliding friction
Question-2
With increase in mass weight of body____ .
(A)
increase
(B)
decrease
(C)
remains same
(D)
none of these
Question-3
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-4
When it is wet a car takes longer to stop. Why is this?
(A)
The water increases the friction so you have more grip.
(B)
The water decreases the friction between the tyres and the road so it takes longer to stop
(C)
The water makes the car difficult to steer so it takes longer to stop.
(D)
The water increases the friction between the tyres and the road so you can brake later
Question-5
Distance travelled by a body in unit time is called
(A)
Velocity
(B)
Speed
(C)
Disoplacement
(D)
Acceleration
Question-6
Limiting friction does not depend on
(A)
Nature of the surfaces in contact with each other
(B)
Weight of the body
(C)
Area of contact
(D)
Mass of the body
Question-7
Mass of a body
(A)
increases with altitude
(B)
decrease with altitude
(C)
remains constant
(D)
increases with depth from the surface of earth.
Question-8
Powder is used in carrom board for:
(A)
Increasing friction
(B)
Decreasing friction
(C)
Decoration
(D)
Fragrance
Question-9
Which of the following is used to reduce friction in a rotating machine?
(A)
Wheels
(B)
Rollers
(C)
Ball bearing
(D)
Polishing
Question-10
The minimum force required to make one body just slide over another body is called
(A)
Static friction
(B)
Rolling friction
(C)
Sliding friction
(D)
Limiting friction
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Std 7
Kerala (English Medium)
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