Processing math: 100%

CBSE Questions for Class 9 Physics Motion Quiz 12 - MCQExams.com

The following figure gives the movement of an object. Select the correct statement from the given choices.
1698440_fc72250ad0334e0da2e55b7cb0b09c31.png
  • The total distance travelled by the object is 975 m
  • The maximum acceleration of the object is 2 ms2
  • The maximum deceleration happened between 25th and 85th seconds
  • The object was at rest between 10th and 15th seconds
  • At 40th second, the speed of object was decelerating
Speed is to velocity as:
  • Centimetre is to metre
  • Force is to torque
  • Velocity is to acceleration
  • Distance is to displacement
The height of the body after 5 s from the ground is (g=9.8m/s2).
  • 8 m
  • 12 m
  • 18 m
  • 24 m
The speed-time graph of a body is straight line parallel to time axis. The body has:
  • uniform acceleration
  • uniform speed
  • variable speed
  • variable acceleration
Two bodies , one held 1m vertically above the other , are released simultaneously and fall freely under gravity . After 2 second , the relative separation of the bodies will be : 
  • 4.9m
  • 9.8m
  • 19.6m
  • 1m
A bus travels 54 km in 90 minutes. The speed of the bus is?
  • 0.6m/s
  • 10m/s
  • 5.4m/s
  • 3.6 m/s
If we denote speed by S, distance by D and time by T the relationship these equation is? 
  • S=D×T
  • T=SD
  • S=1T×D
  • S=TD
Four cars A,B,C and D are moving on a levelled road. Their distance versus time graphs are shown in Fig 8.2. Choose the correct statement
1791219_f299220a4fa34f0493f264105f45bd05.png
  • Car A is faster than car D.
  • Car B is the slowest.
  • Car D is faster than car C.
  • Car C is the slowest.
A body is thrown vertically upward with velocity u, the greatest height h to which it will rise is,
  • ug
  • u22g
  • u2g
  • u2g
The correct symbol to represent the speed of an object is
  • 5m/s
  • 5mp
  • 5m/sec1
  • 5s/m

A black paper absorbs light of all the colours and reflects none.


  • True
  • False
State whether the following statement is true or false.
In a uniform circular motion, the speed continuously changes because of the direction of motion changes.
  • True
  • False
18 km h1 is equal to :
  • 10 ms1
  • 5 ms1
  • 18 ms1
  • 1.8 ms1
A body falls from rest, its velocity at the end of first second is (g=32ft/s2) 
  • 16ft/s
  • 32ft/s
  • 64ft/s
  • 24ft/s
A body thrown with an initial speed of 96ft/sec  reaches the ground after (g=32ft/sec2)
  • 3sec
  • 6sec
  • 12sec
  • 8sec
The variation of velocity of a particle with time moving along a straight line is shown in the figure. The distance traveled by the particle in 4 s is :
1812909_46f7fdeb6d8a4de2ba2bbd445dde73db.png
  • 60m
  • 55m
  • 25m
  • 30m
Time taken by an object falling from rest to cover the height of h1 and h2 is respectively t1 and t2 then the ratio of t1 to t2 is 
  • h1:h2
  • h1:h2
  • h1:2h2
  • 2h:h
An object moving in upward direction opposite to the gravitational force of earth performs
  • accelerated motion
  • motion with constant velocity
  • oscillations
  • retarded motion
The horizontal straight line obtained from the distance-time graph is related to which of the following velocity ?
  • Zero velocity
  • Constant velocity
  • Increasing velocity
  • Decreasing velocity
Four alternatives are given to each of the following incomplete statements/questions, choose the right answer.
Uniform circular motion is called continuously accelerated motion mainly because 
  • Direction of motion changes
  • Speed remains the same
  • Velocity remains the same
  • Direction of motion does not change
Figure represents the displacement-time graph of motion of two cars A and B. Find the velocities of car A and car B.
202877.png
  • vA=20kmh1,vB=10kmh1
  • vA=10kmh1,vB=20kmh1
  • vA=20kmh1,vB=40kmh1
  • vA=40kmh1,vB=20kmh1
In the figure, the displacement time graph of a body is shown at different time-intervals. Calculate the velocity of the body as it moves for
(i) 0 to 5s,
(ii) 5s to 7s and
(iii) 7s to 9s.
202837_c87365c105284a2c85d044372a22f89a.png
  • (i) 1.2ms1(ii) 0ms1(iii) 1ms1
  • (i) 0.6ms1(ii) 0ms1(iii) 2ms1
  • (i) 0ms1(ii) 0.6ms1(iii) 4ms1
  • (i) 0.3ms1(ii) 1ms1(iii) 1.2ms1
Two masses of mass 40 gm and 30 gm are connected across a pulley with the help of light string, then the acceleration of the system is 
  • 4.9m/s2
  • 2.94m/s2
  • 1.4m/s2
  • 9.8m/s2
A lift performs the first part of its ascent with uniform acceleration, a, and the remaining with uniform retardation, 2a. If, t, is the time of ascent, the depth of the shaft is
  • at24
  • at23
  • at22
  • at28
Using the table given below where the values of velocity at the end of t seconds for a body under linear motion are given
V(ms1)
0

6
12
24
30
36
42
t(s)
0

2
4
8
10
12
14
What can be concluded about the motion of the body?
  • It moves with uniform speed.
  • It moves with uniform motion
  • It moves with uniform velocity
  • It moves with uniform acceleration
What is the minimum height above the ground at which the rocketeer should catch the student?
  • 92.1 m
  • 460.9 m
  • 78.8 m
  • 82.3 m
A smooth track of incline of length l is joined smoothly with circular track of radius R. A mass of mkg is projected up from the bottom of the inclined plane. The minimum speed of the mass to reach the top of the track is given by, v=

136475.PNG
  • [2g(lcosθ+R)(1+cosθ)]1/2
  • (2glsinθ+R)1/2
  • [2g{lsinθ+R(1cosθ)}]1/2
  • (2glcosθ+R)1/2
A particle experiences a net force that is always parallel to y-axis. If it moves along the curve xy=a2 where a is a constant and the magnitude of the force is yn, then n is
  • 1
  • 2
  • 3
  • 4
With what speed in miles/hour (1m/s=2.23mi/h) must an object be thrown to reach a height of 91.5m (equivalent to one football field)? Assume negligible air resistance.
  • 94.4mi/h
  • 84.4mi/h
  • 74.4mi/h
  • 94mi/h
Which of the following statements is correct for a particle travelling with a constant speed?
  • Its position remains constant as time passes.
  • It covers equal distances in unequal time intervals.
  • Its acceleration is zero.
  • It does not change its direction of motion.
A race car accelerates uniformly from 18.5m/s to 46.1m/s in 2.47 seconds. Determine the distance traveled by the car. (in m)
  • 79.8m
  • 79m
  • 7.8m
  • 9.8m
An engineer is designing the runway for an airport of the planes that will use the airport, the lowest acceleration rate is likely to be 3m/s2. The takeoff speed for this plane will be 65m/s. Assuming this minimum acceleration, what is the minimum allowed length for the runway? (in m)
  • 704
  • 70
  • 705
  • 707
The driver of a train travelling at 115 km h1 seen on the same track, 100 m in front of him, a slow train travelling in the same direction at 25 km h1. The least retardation that must be applied to faster train to avoid a collision is
  • 25 ms2
  • 50 ms2
  • 75 ms2
  • 3.125 ms2
The graph below shows the distance travelled and the time taken by four cars.
Which car travelled the slowest?
516613_69218fdcf1ac40b381bb56885e71dfc8.png
  • Car 1
  • Car 2
  • Car 3
  • Car 4
A stone is thrown vertically upwards. When the stone is at a height equal to half of its maximum height its speed will be 10 m/s, then the maximum height attained by the stone is (Take g =10 m/s2)
  • 3 m
  • 15 m
  • 1 m
  • 10 m
The figure shows the displacement time graph of a particle moving on a straight line path. What is the magnitude of average velocity of the particle over 10 s?
283405_48bd7e939b90400791d6799102f544ff.png
  • 2ms1
  • 4ms1
  • 6ms1
  • 8ms1
A car, moving at 1.5 ms1 applies brakes and comes to rest in 2s. If the same car travels at double the speed, what time would it take to come to rest after applying brakes?
  • 4s
  • 8s
  • 2s
  • 3s
The particle is moving with constant speed
986359_1148e5b5985c4139bb7a1e0cc3926855.png
  • In graphs (i) and (iii)
  • In graphs (i) and (iv)
  • In graphs (i) and (ii)
  • In graphs (i)
Two cyclists, k km apart, and starting at the same time, would be together In r hours if they travelled in the same direction, but would pass each other In t hours if they travelled in opposite directions. The ratio of the speed of the faster cyclist to that of the slower is ____
  • r+trt
  • rrt
  • r+tr
  • rt
The acceleration will be positive in:
985938_47215d9fd8b9423195a8122ead4b99d7.JPG
  • (I) and (III)
  • (I) and (IV)
  • (II) and (IV)
  • None of these
A spy plane is being tracked by a radar. At t=0, its position is reported as (100m,200m,1000m). 130s later, its position is reported to be (2500m,1200m,1000m). Find a unit vector in the direction of plane velocity and the magnitude of its average velocity.
  • 20ms1; 22ˆi+5ˆj13
  • 20ms1; 12ˆi+5ˆj13
  • 30ms1; 12ˆi+5ˆj13
  • 20ms1; 12ˆi+6ˆj13
Speed - distance graph of an object which comes to rest suddenly is
Consider the graph given.
The distance travelled by an object in a given direction as time increases is given by the given graph.
In this context which of the following statements is correct?

931349_d1a00baef63845cf869077de64225d84.png
  • The velocity decreases during DE
  • The velocities during DE and BC are in opposite directions
  • Total distance travelled is AF
  • During CD the body is moving with uniform velocity
A body was initially moving with 10 m/sec and it starts acceleration with 2 m/sec2, the distance covered by it in 10 sec will be
  • 200 m
  • 100 m
  • 150 m
  • 250 m
A train is travelling at a speed of 108 km/h. Brakes are applied so as to produce a uniform retardation of 1 m/s2. Find how far the train will go before it is brought to rest :
  • 800 m
  • 450 m
  • 1000 m
  • 1050 m
A jeep starts from rest and attains a speed of 40 km h1 in 10 minutes. The uniform acceleration will be :
  • 4 km h2
  • 4 km s2
  • 66.7 m s2
  • 1.85 cm s2
A particle has a velocity u towards east at t =Its acceleration is towards west and is constant, Let XA and XB be the magnitude of displacements in the first 10 seconds and the next 10 seconds. 
  • XA<XB
  • XA=XB
  • XA>XB
  • the information is insufficient to decide the relation of XA and XB.
For the graph given below the ratio of average speed to the average velocity in (ms1) of the particle is.
1048016_c0da2209434e4a4e96175663375c0ead.png
  • 56
  • 58
  • 3
  • 4
Water drops fall at regular intervals from a roof at of 125 m from the ground. At an instant when 11th drop is about leave the roof and 1st drop is at a height of 45 m from the ground at that instant the dist of 10th drop from the roof is (g=10 m/s2)
  • 0.40 m
  • 0.20 m
  • 0.80 m
  • 1.2 m
The splash is heard 2.05 s after the stone is dropped into a well of depth 19.6 m. The velocity of sound is?
  • 342 ms1
  • 372 ms1
  • 392 ms1
  • 352 ms1
0:0:1


Answered Not Answered Not Visited Correct : 0 Incorrect : 0

Practice Class 9 Physics Quiz Questions and Answers