Extra 40 MCQs with answers from the Motion chapter:8 of Class 9 CBSE Science:-
Which of the following is a scalar quantity?
a) Displacement
b) Velocity
c) Speed
d) Acceleration
Answer:
c) Speed
A body is said to be in motion if it changes its _______ with respect to time.
a) Position
b) Shape
c) Size
d) Mass
Answer:
a) Position
What is the SI unit of displacement?
a) Meter
b) Kilogram
c) Second
d) Newton
Answer:
a) Meter
A car moves with a speed of 20 m/s for 10 s. How much distance does it cover?
a) 100 m
b) 200 m
c) 300 m
d) 400 m
Answer:
b) 200 m
The motion of the hands of a clock is an example of _______ motion.
a) Rectilinear
b) Circular
c) Periodic
d) Rotational
Answer:
c) Periodic
A car moving at a uniform speed covers equal distances in _______.
a) Unequal intervals of time
b) Equal intervals of time
c) Increasing time intervals
d) Decreasing time intervals
Answer:
b) Equal intervals of time
Which of the following quantities does not change in uniform circular motion?
a) Speed
b) Velocity
c) Acceleration
d) Direction
Answer:
a) Speed
The slope of a displacement-time graph represents:
a) Acceleration
b) Speed
c) Velocity
d) Distance
Answer:
c) Velocity
A bus travels 100 km in 2 hours and then 200 km in the next 3 hours. What is its average speed?
a) 50 km/h
b) 60 km/h
c) 70 km/h
d) 40 km/h
Answer:
d) 40 km/h
Velocity is defined as:
a) Distance covered per unit time
b) Speed in a particular direction
c) Change in displacement per unit time
d) Both (b) and (c)
Answer:
d) Both (b) and (c)
The equation v=
u+atv
= u +
atv
=
u+at
represents:
a) First equation of motion
b) Second equation of motion
c) Third equation of motion
d) Newton’s law of motion
Answer:
a) First equation of motion
The second equation of motion is:
a) v=
u+atv
= u +
atv
=
u+at
b) s=ut+12at2s =
ut
+ \frac{1}{2} at^2s=ut+21at2
c) v2=u2+2asv^2 = u^2 + 2asv2=u2+2as
d) F=
maF
=
maF
=ma
Answer:
b) s=ut+12at2s =
ut
+ \frac{1}{2} at^2s=ut+21at2
What is the SI unit of acceleration?
a) m/s
b) m/s²
c) km/h²
d) m/s³
Answer:
b) m/s²
What does the area under a velocity-time graph represent?
a) Speed
b) Acceleration
c) Distance travelled
d) Displacement
Answer:
c) Distance
travelled
If a body is moving with uniform velocity, its acceleration is:
a) Positive
b) Negative
c) Zero
d) Infinity
Answer:
c) Zero
A ball is dropped from a height. Its initial velocity is:
a) Zero
b) 9.8 m/s
c) 4.9 m/s
d) 2 m/s²
Answer:
a) Zero
What does a horizontal line in a velocity-time graph indicate?
a) Uniform velocity
b) Acceleration
c) Retardation
d) Zero displacement
Answer:
a) Uniform velocity
The acceleration due to gravity on Earth is:
a) 9.8 m/s²
b) 8.9 m/s²
c) 10.2 m/s²
d) 9.2 m/s²
Answer:
a) 9.8 m/s²
If a car accelerates uniformly from 10 m/s to 30 m/s in 5 seconds, its acceleration is:
a) 2 m/s²
b) 4 m/s²
c) 6 m/s²
d) 8 m/s²
Answer:
a) 4 m/s²
What happens to velocity in uniform motion?
a) Increases
b) Decreases
c) Remains constant
d) Changes randomly
Answer:
c) Remains constant
The motion of a pendulum is an example of:
a) Uniform motion
b) Non-uniform motion
c) Rotational motion
d) Circular motion
Answer:
b) Non-uniform motion
A train moving at 50 m/s slows down to 10 m/s in 4 seconds. The acceleration is:
a) -10 m/s²
b) 10 m/s²
c) 20 m/s²
d) -20 m/s²
Answer:
a) -10 m/s²
The speedometer of a car measures:
a) Average speed
b) Instantaneous speed
c) Acceleration
d) Distance
Answer:
b) Instantaneous speed
A body moving in a straight line with uniform acceleration has a:
a) Curved displacement-time graph
b) Straight displacement-time graph
c) Horizontal displacement-time graph
d) Zigzag displacement-time graph
Answer:
a) Curved displacement-time graph
Which of the following statements is true?
a) Velocity is always positive
b) Acceleration is always positive
c) Distance is always positive
d) Displacement is always positive
Answer:
c) Distance is always positive
The magnitude of displacement is always:
a) Greater than or equal to distance
b) Less than or equal to distance
c) Always equal to distance
d) Sometimes greater than distance
Answer:
b) Less than or equal to distance
The negative acceleration is called:
a) Retardation
b) Uniform motion
c) Free fall
d) Zero acceleration
Answer:
a) Retardation
The distance covered by a freely falling body in 2 seconds is:
a) 9.8 m
b) 19.6 m
c) 4.9 m
d) 39.2 m
Answer:
b) 19.6 m
A body moving with constant velocity has:
a) No force acting on it
b) No acceleration
c) No momentum
d) Increasing acceleration
Answer:
b) No acceleration
A car moving with increasing speed has:
a) Uniform velocity
b) Uniform acceleration
c) Decreasing acceleration
d) Zero acceleration
Answer:
b) Uniform acceleration
The gradient of a speed-time graph gives:
a) Acceleration
b) Velocity
c) Distance
d) Time
Answer:
a) Acceleration
SI unit of speed is:
a) m/s
b) km/h
c) m/s²
d) m³/s
Answer:
a) m/s
The acceleration of an object moving with constant velocity is:
a) Zero
b) Constant
c) Increasing
d) Decreasing
Answer:
a) Zero
The motion of satellites around the Earth is:
a) Rectilinear motion
b) Circular motion
c) Vibratory motion
d) Random motion
Answer:
b) Circular motion
The graph of uniform acceleration is:
a) A curved line
b) A zigzag line
c) A straight line
d) A horizontal line
Answer:
c) A straight line
