CBSE Questions for Class 9 Physics Motion Quiz 9 - MCQExams.com

A block starts accelerating at $$5 m/s^{2}$$ from rest on a frictionless surface. Calculate the distance traveled by  the block in first 4 seconds?
  • 20 m
  • 40 m
  • 80 m
  • 120 m
  • 160 m
A boy having uniform acceleration of $$\displaystyle 10\ { m s }^{ -2 }$$ has a velocity of $$\displaystyle 100\ { ms }^{ -1 }$$. In what time the velocity will be doubled?
  • $$8\ s$$
  • $$10\ s$$
  • $$12\ s$$
  • $$14\ s$$

A block is moving in a circular path at constant speed. Which of the following statements is/are true?

I. The velocity is constant.

II. The direction of motion is constant.

III. The magnitude of velocity is constant.
  • II only
  • I and III only
  • II and III only
  • I and II only
  • III only
Uniform linear motion is a/an _______ motion while uniform circular motion is a/an _______ motion. 
  • accelerated, non accelerated
  • non accelerated, accelerated
  • deviated, retarded
  • uniform, retarded

Which of the following statement must always be true?

I.If an objects acceleration is zero, then its speed must remain constant.

II. If an objects acceleration is constant, then it must move in a straight line.

III. If an objects speed remains constant, then its acceleration must be zero.
  • I and II only
  • I and III only
  • I only
  • III only
  • II and II only
An object of mass m moving with constant speed $$v$$ completes one round of circular path. Three conditions are given below, which one of the following statements is correct
I. The displacement is zero.
II. The average speed is zero.
III. The acceleration is zero
  • I only
  • I and IIonly
  • I and III only
  • III only
  • II and III only
A car starts from rest and accelerates on a straight horizontal track at $$5 {m}/{{s}^{2}}$$. Find out the distance travel by the car in $$8$$ seconds?
  • $$40 m$$
  • $$60 m$$
  • $$80 m$$
  • $$120 m$$
  • $$160 m$$
The graphs above show that position versus time for three different cars: $$1, 2,$$ and $$3$$. Rank these cars according to the magnitudes of their velocities, greatest first. 
495224.jpg
  • $$1, 2, 3$$
  • $$3, 2, 1$$
  • $$2, 1, 3$$
  • $$2, 3, 1$$
  • All tie
 In which of the following option could represent the ball moving at a constant velocity? 
The graphs below the position versus time for three differences cars 1, 2 andRank these cars according the magnitudes of their velocities at the time "t" indicated on the graph, greatest first
492352_473f9315ffaf4878836a693be0c3b584.png
  • 1, 2 , 3
  • 1, 3 , 2
  • 2, 1, 3
  • 3, 2, 1
  • 3, 1, 2
A car accelerates steadily so that it goes from a velocity of 20 m/s to a velocity of 40 m/s in 4 seconds. What is its acceleration?  
  • 0.2 $$m/s^2$$
  • 4 $$m/s^2$$
  • 5 $$m/s^2$$
  • 10 $$m/s^2$$
  • 80 $$m/s^2$$
The position-time graphs above represent the motions of cars $$1$$ to $$5$$.
How do they rank, according to their speeds (greatest first)?
495234.jpg
  • $$1, 2, 3, 4, 5$$
  • $$1, 2, 3$$ and $$5$$ tie $$4$$
  • $$1, 2, 4, 3$$ and $$5$$ tie
  • $$3$$ and $$5$$ tie, $$4, 2, 1$$
  • $$5, 4, 3, 2, 1$$
A cart begins from rest at the top of a long incline and rolls with a constant acceleration of $$2m/s^{2}$$. How far has the cart moved along the incline after rolling for $$3$$ seconds?
  • $$3$$ meters
  • $$6$$ meters
  • $$9$$ meters
  • $$18$$ meters
The graph above shows position versus time for an object moving along a straight line. During which time interval(s) is the object's speed increasing?
I. $$0$$ to $$1$$ seconds
II. $$1$$ to $$2$$ seconds
III. $$2$$ to $$3$$ seconds
494631.png
  • I only
  • II only
  • III only
  • I and III only
The two position-time graphs time in seconds pictured below on the same grid represents the position of a motorized car (red) and a cart coming down a ramp (blue). At what time are their velocity close to being the same?
492473_dd1645b9d97842c5b4271ab352d0223d.png
  • 1 second
  • 2 second
  • 3 second
  • 4 second
  • 5 second
The velocity-time graph below represents the velocity of a toy train as it moves north and south with velocity near the middle of the vertical axis. During which, Interval(s) is the toy train speeding up?
492356_69058c5443c74b4f8e2ec0175256db18.png
  • $$0\ to\ A$$ only
  • $$0\ to\ A$$ and $$D\ to\ E$$
  • $$A\ to\ B$$ 
  • $$B\ to\ D$$  only
  • $$A\ to\ B$$ and $$D\ to\ E$$ 
Which of the following vehicles is undergoing a deacceleration?
  • A car driving straight to the east on a road at a constant speed
  • A truck rounding a corner at a constant speed
  • A van slowing down as it approaches a stop sign
  • None of these
An airplane accelerates down a runway at $$3.2 m s^{-2}$$ for 32.8 s until it finally lifts off the ground. Determine the distance travelled before takeoff.
  • 1323 m
  • 1527 m
  • 1721 m
  • 1931 m
The two ends of a train moving with uniform acceleration pass a certain point with velocities $$6\ kmph$$ and $$8\ kmph$$ respectively. What is the velocity with which the middle point of the train passes the same point?
  • $$7\ kmph$$
  • $$5\sqrt{2}\ kmph$$
  • $$2 \sqrt{10}\ kmph$$ 
  • $$7.5\ kmph$$
The velocity graphs below represent the motion of $$5$$ different object moving along a north-south line.
Which object changed directions during the represented movement?
When will a body have zero speed?
  • When a body has uniform acceleration
  • When a body has non-uniform acceleration
  • When a body is at rest
  • When a body is under motion
A body loses half of its velocity on penetrating $$6\ cm$$ in a wooden block. How much will it penetrate more before coming to rest?
  • $$1\ cm$$
  • $$2\ cm$$
  • $$3\ cm$$
  • $$4\ cm$$
The graphs below show the position versus time for three different cars: $$1, 2,$$ and $$3$$.
Rank these cars according to the magnitudes of their velocities at the time "t" indicated on the graph, greatest first.
495248.jpg
  • $$1, 2, 3$$
  • $$1, 3, 2$$
  • $$2, 1, 3$$
  • $$3, 2, 1$$
  • $$3, 1, 2$$
A space shuttle is launched into space. During the first 8 minutes of its launch the average acceleration of the shuttle is $$17.5 m s^{-2}$$. What is its speed after 8 minutes?
  • $$8000 m s^{-1}$$
  • $$8400 m s^{-1}$$
  • $$1200 m s^{-1}$$
  • $$1500 m s^{-1}$$
A bike accelerates uniformly from rest to a speed of 7.10 m $$s^{-1}$$ over a distance of 35.4 m. Determine the acceleration of the bike.
  • 0.412 m $$s^{-2}$$
  • 0.512 m $$s^{-2}$$
  • 0.612 m $$s^{-2}$$
  • 0.712 m $$s^{-2}$$
Each of the following graphs represents the position of a car as it moves or stays along a straight line. The scales on all the graphs are the same.
Which graph represents the fastest speed of the car at time T?
The velocity graphs pictured below represent the motions of five different colored objects of identical mass, with the color of the graph corresponding to the color of the object.
What is the order of objects, according to the magnitudes of the net forces they are experiencing during the time represented by their graphs, greatest first?
495396_7612d22e2fc144b1b860238df33ef7e6.png
  • Blue, purple, red, yellow, green
  • Purple, red, yellow, blue and green tie
  • Blue and green tie, yellow, purple, red
  • Purple, red, blue, yellow, green
  • Yellow, red, purple, blue and green tie
A body having uniform speed will always have uniform velocity.
  • True
  • False
State whether true or false.
If a body starts from rest and moves with uniform acceleration, then the displacement of the body is directly proportional to the time of the journey.
  • True
  • False
A body having zero speed for long tme :
  • It is always under rest.
  • It has zero acceleration.
  • It has uniform acceleration.
  • It is always under motion.
The ratio of the magnitude of average velocity to average speed of a body in motion can be ________ one.
  • less than
  • equal to
  • greater than
  • none of these
State whether true or false.
A body moving in a straight line can have constant velocity with varying speed.
  • True
  • False
State whether true or false.
A body undergoing linear motion can have velocity and acceleration in opposite directions.
  • True
  • False
The speed of a car reduces from 15 m $$s^{-1}$$ to 5 m $$s^{-1}$$ over a displacement of 10 m. What is the retardation of the car?
  • -10 m $$s^{-2}$$
  • +10 m $$s^{-2}$$
  • 2 m $$s^{-2}$$
  • 0.5 m $$s^{-2}$$
Read the following statements and state whether they are True or False:
i) If $$u$$ and $$a$$ both are negative, motion is only retarded.
ii) If $$u$$ is negative but $$a$$ is positive, then displacement of the particle can never be positive.
iii) If u is positive but $$a$$ is negative particle comes to rest for a moment at some time but if $$u$$ is negative and $$a$$ positive it never comes to rest.
  • F, F, F
  • T, T, T
  • T, F, T
  • F, T, F
A point mass starts moving in a straight line with constant acceleration "$$a$$". At a time $$t$$ after the beginning of motion, the acceleration changes sign, without change in magnitude. Determine the time $${t}_{0}$$ from the beginning of the motion in which the point mass returns to the initial position.
  • $$\left(2 + \sqrt{3} \right)t$$
  • $$\left(2 + \sqrt{2} \right)t$$
  • $$\left(3 + \sqrt{2} \right)t$$
  • $$\left(12 + \sqrt{2} \right)t$$
What will be ratio of speed in first two seconds to the speed in next 4 s?
583064.jpg
  • $$\sqrt 2$$ : 1
  • 3 : 1
  • 2 : 1
  • 1 : 2
The displacement - time graph of a particle moving along a straight line is  given below. Find the time at which its velocity is equal to zero.
587686_0d6d607bd2f747b1bf77b68358c37946.png
  • $$0$$
  • $$2$$
  • $$4$$
  • None of these
What will the ball's speed be when it returns to its starting point? (in m/s)
  • $$8$$
  • $$4$$
  • $$5$$
  • $$7$$
How long does it take for the ball to strike the ground?
  • $$4.52 s$$
  • $$5 s$$
  • $$6 s$$
  • $$7 s$$
A race car accelerates uniformly from $$18.5 m/s$$ to $$46.1 m/s$$ in $$2.47$$ seconds. Determine the acceleration of the car. (in $$m/s^2$$)
  • $$11.2 m/s^2$$
  • $$11 m/s^2$$
  • $$1.2 m/s^2$$
  • $$51.2 m/s^2$$
A dragster accelerates to a speed of $$112 m/s$$ over a distance of $$398 m$$. Determine the acceleration (assume uniform) of the dragster.
  • $$5.8 m/s^2$$
  • $$11.8 m/s^2$$
  • $$15 m/s^2$$
  • $$15.8 m/s^2$$
An aircraft has a lift-off of $$120km/h$$. What minimum constant acceleration does the aircraft require if it is to be airborne after a takeoff run of $$240m$$? (in $$m/s^2$$)
  • $$2.2$$
  • $$2.3$$
  • $$2.4$$
  • $$2.5$$
Rex Things throws his mother's crystal vase vertically upwards with an initial velocity of $$26.2 m/s$$. Determine the height to which the vase will rise above its initial height.
  • $$34.0 m$$
  • $$39.0 m$$
  • $$35.0 m$$
  • $$37.0 m$$
Rocket-powered sleds are used to test the human response to acceleration. If a rocket-powered sled is accelerated to a speed of $$444 m/s$$ in $$1.83$$ seconds, then what is the acceleration? (in $$m/s^2$$)
  • $$243 m/s/s$$
  • $$24 m/s/s$$
  • $$23 m/s/s$$
  • $$43 m/s/s$$
How long does it take it to reach $$1000m$$ $$in \ seconds$$ ? 
  • $$12$$
  • $$12.5$$
  • $$11$$
  • $$13$$
A plane has a takeoff speed of $$88.3 m/s$$ and requires $$1365 m$$ to reach that speed. Determine the acceleration of the plane.
  • $$3.86 m/s^2$$
  • $$2.86 m/s^2$$
  • $$2.8 m/s^2$$
  • $$2.6 m/s^2$$
the magnitude of its acceleration(in $$m/s^2$$):
  • $$1$$
  • $$1.25$$
  • $$2$$
  • $$5$$
If $${ v }^{ 2 }={ u }^{ 2 }+2as$$, then $$u =$$
  • $${ v }^{ 2 }-2as$$
  • $$\pm \sqrt { 2as-{ v }^{ 2 } } $$
  • $$\pm \sqrt { { v }^{ 2 }-2as } $$
  • $$\pm \sqrt { { v }^{ 2 }+2as } $$
The meter that is used to measure the distance moved by the vehicle is known as _____. Fill in the blank.
  • Speedometer
  • Odometer
  • Chronometer
  • Ammeter
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