STD IX - Science (II)
Class
Rate of change of displacement is called
A) Speed
B) acceleration
C) Velocity
D) Deceleration
Acceleration is a vector quantity, which indicates that its value
A) can be positive, negative or zero
B) is always positive
C) is always negative
D) is zero
An example of a body moving with constant speed but still accelerating is
A) A body moving with constant speed in a circular path
B) A body moving with constant speed on a straight road
C) A body moving in a helical path with constant speed
D) A body moving with constant speed on a straight railway track
If a bus takes a sharp turn then passengers inside move outward due to
A) force
B) inertia
C) normal force
D) friction
The physical quantity, which is the measure of inertia, is ________
A) density
B) weight
C) force
D) mass
When an object is moving with uniform velocity, what is its acceleration?
A) zero
B) uniform
C) non-uniform
D) negative
What does the distance-time graph indicate?
A) uniform speed
B) body is at rest
C) non-uniform speed
D) variable speed
The S.I. Unit of force is ___________.
A) erg
B) joule
C) newton
D) dyne
Force with which earth attracts bodies towards its center is called
A) mass
B) inertia
C) gravitational force
D) weight
Displacement is a ________ quantity.
A) scalar
B) vector
C) derived
D) linear
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