Class 9 Science MCQ Motion

Question : A boy throws a ball up and catches it when the ball falls back. In which part of the motion the ball is accelerating?
(a) During downward motion
(b) When the ball comes to rest
(c) During upward motion
(d) When the boy catches the ball

Question : If the displacement of an object is proportional to the square of time, then the object moves with:
(a) uniform velocity
(b) uniform acceleration
(c) increasing acceleration
(d) decreasing acceleration

Question : The ratio of speed to the magnitude of velocity when the body is moving in one direction is
(a) Less than one
(b) Greater than one
(c) Equal to one
(d) Greater than or equal to one

Question : 180° plane angle is equal to
(a) π/2 radian
(b) π radian
(c) 2π radian
(d) none of these

Question : The ratio of the heights from which two bodies are dropped is 3:5 respectively. The ratio of their final velocities is:​
(a) 9: 25
(b) √ 3: √ 5
(c) 5 : 3
(d) √5 : √3

Question : A racing car has a uniform acceleration of 6 m/s². In 10s it will cover:​
(a) 300m
(b) 100m
(c) 200m
(d) 350m

Question : Speed of a body in particular direction can be called
(a) acceleration
(b) displacement
(c) velocity
(d) distance

Question : The slope of distance – time graph gives instantaneous.
(a) acceleration
(b) speed
(c) velocity
(d) Distance covered

Question : If a moving body comes to rest, then its acceleration is-
(a) positive
(b) both of these depending upon the initial velocity
(c) negative
(d) zero

Question : At the maximum height, a body thrown vertically upwards has
(a) velocity not zero but acceleration zero.
(b) acceleration not zero but velocity zero.
(c) both acceleration and velocity not zero.
(d) both acceleration and velocity zero.

Question : The magnitude of speed and velocity of a body is equal only if the body moves along a
(a) straight line.
(b) circular path.
(c) zigzag path.
(d) curved path.

Question : A car moving on a straight road is said to possess
(a) rectilinear motion.
(b) rotatory motion.
(c) rotatory motion.
(d) both a and b.

Question : A body is moving along a circular path of radius r. The displacement of the body when it completes half a revolution is
(a) 0
(b) 2r
(c) πr
(d) 2πr

Question : The SI unit of retardation is
(a) m s^–1
(b) m s^–2
(c) m s²
(d) m

Question : For uniform motion
(a) the distance–time graph is a straight line parallel to the time axis.
(b) the speed–time graph is a straight line inclined to time axis.
(c) the speed–time graph is a straight line parallel to time axis.
(d) the acceleration–time graph is a straight parallel to time axis.

Question : For a body moving with a constant speed along a circular path, the direction of the velocity is
(a) horizontal.
(b) perpendicular to the radius.
(c) along the tangent to the circle.
(d) constant.

Question : A stone tied to a thread and whirled in a circular path is an example of
(a) circular motion.
(b) rotatory motion.
(c) rectilinear motion.
(d) uniform circular motion.

Question : For a uniformly retarded motion, the velocity–time graph is
(a) a curve.
(b) a straight line parallel to time axis.
(c) a straight line perpendicular to time axis.
(d) a straight line inclined to time axis.

Question : When a body travels in a straight line and its velocity changes by equal amounts in equal intervals of time, it is said to have
(a) uniform velocity.
(b) non-uniform acceleration.
(c) uniform acceleration.
(d) uniform speed.

Question : Which is a vector quantity?
(a) Weight
(b) Mass
(c) Density
(d) Volume

Question : A shot-put thrown by an athlete is said to be in
(a) rectilinear motion.
(b) rotatory motion.
(c) curvilinear motion.
(d) oscillatory motion.

Question : The average velocity of a body is equal to mean of its initial velocity and final velocity. The acceleration of the body is
(a) variable.
(b) zero.
(c) negative.
(d) uniform.

Question : The slope of a speed–time graph gives
(a) velocity.
(b) acceleration.
(c) displacement.
(d) distance travelled.

Question : A free-falling stone under the action of gravity exhibits a
(a) uniform motion.
(b) non-uniform motion.
(c) zigzag motion.
(d) curvilinear motion.

Question : The device fitted in an automobile to measure the distance travelled by it is
(a) odometer.
(b) speedometer.
(c) hygrometer.
(d) ticker tape timer.

Question : The area under a speed–time graph represents a physical quantity which has the unit of
(a) m
(b) m2
(c) m s^–1
(d) m s^–2

Question : A body dropped from the top of a tower reaches the ground in 4 seconds. What is the height of the tower, if g = 10 m s^–2?
(a) 78 m
(b) 70 m
(c) 80 m
(d) 90 m

Question : A sprinter is running along the circumference of the sports ground with constant speed. Which of the following is changing?
(a) Magnitude of acceleration
(b) Distance covered
(c) Force acting on the sprinter
(d) Direction of motion

Question : A bus starting from rest moves with uniform acceleration of 0.1 m/s²for 2 minutes. The distance covered by the bus is
(a) 720 m.
(b) 620 m.
(c) 320 m.
(d) 520 m.

Question : The distance travelled by a body moving in a circular path is
(a) πr²
(b) 2πr
(c) πr
(d) 2πr²

Question : If a body takes time t to complete one round of the circular path of radius r, then the speed of the body (v) is given by
(a) v = πr × t
(b) v = πr/t
(c) 2πr/t
(d) 2πr × t

Question : A body falling freely under gravity shows a
(a) uniform acceleration.
(b) non-uniform acceleration.
(c) uniform velocity.
(d) variable velocity.

Question : Which is not the correct equation of motion?
(a) s = ut + (1/2)at²
b. v²– u²= 2as
(c) v = u – at
(d) v – u = at

Question : If a bus decreases its speed from 80 km/h to 60km/h, then its retardation is
(a) 11.1 m s^–2
(b) 1.11 m s^–2
(c) –1.11 m s^–2
(d) 111 m s^–2

Question : A ship is moving at a speed of 56 km/h. One second later it is moving at 58 km/h, then its acceleration is
(a) 72 km h^–2
(b) 720 km h^–2
(c) 7200 km h^–2
(d) 7.2 km h^–2

Question : If a driver decreases the speed of a car from 25 m/s to 10 m/s in 5 seconds, the acceleration produced by the car is
(a) –3 m s^–2
(b) 3 m s^–2
(c) 5 m s^–2
(d) 7 m s^–2

Question : When a car driver travelling at a speed of 10 m/s applies brakes and brings the car to rest in 20 s, the retardation will be
(a) +2 m s^–2
(b) –2 m s^–2
(c) –0.5 m s^–2
(d) + 0.5 m s^–2

Question : The distance–time graph of a body having non-uniform motion is a
(a) straight line parallel to time axis.
(b) straight line perpendicular to time axis.
(c) curved line.
(d) zigzag line.

Question : If a body covers equal distances in equal intervals of time in a particular direction, the body is said to have a
(a) uniform velocity.
(b) non-uniform speed.
(c) uniform speed.
(d) variable velocity.