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Question-1
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-2
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-3
Friction is a force and it is measured in units called
(A)
Kilograms
(B)
Newtons
(C)
Mass
(D)
Weight
Question-4
For two surface which of the following has highest magnitude.
(A)
Static friction
(B)
Limiting friction
(C)
Dynamic friction
(D)
Sliding friction
Question-5
When a body falls freely from a height b,above the surface of earth,its velocity will be maximum.
(A)
At the starting position
(B)
When it touches the surface of earth
(C)
At an intermediate position
(D)
Cannot be predicted.
Question-6
Which of the following activities is easier to perform?
(A)
Dragging a box
(B)
Lifting a box
(C)
Rolling a drum of same weight
(D)
All of the above need same effort
Question-7
The surface of a table is smoother as compared to that of a road. This is due to:
(A)
irregularities in the surface of road
(B)
polishing of the table
(C)
a road surface may have more dust as compared to a table
(D)
all of the above
Question-8
Gravitational force acting on a body of mass 15kg is
(A)
140N
(B)
145N
(C)
147N
(D)
150N
Question-9
Weight of a body is measured by
(A)
inertial balance
(B)
physical balance
(C)
beem balance
(D)
spring balance
Question-10
The force which prevents us from slipping while walking on the road is:
(A)
Muscular force of our body
(B)
Gravitational pull by earth
(C)
Friction force
(D)
Balanced forces of nature
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Std 7
Kerala (English Medium)
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