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NCERT Solutions for class 11 Physics | Chapter 3 - Motion in a Straight Line

Questions
1 A body is thrown upwards and reaches half of its maximum height. At that position
A its acceleration is constant
B its velocity is zero
C its velocity is maximum
D its acceleration is minimum

Answer:its acceleration is constant
2 Velocity time curve for a body projected vertically upwards is
A straight line
B ellipse
C parabola
D hyperbola

Answer:straight line
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3 The area under acceleration time graph gives
A change in velocity
B change in acceleration
C distance travelled
D force acting

Answer:change in velocity
4 The slope of velocity-time graph for motion with uniform velocity is equal to
A zero
B final velocity
C initial velocity
D none of these

Answer:zero
5 Which of the following is a one dimensional motion ?
A Motion of train running on a straight track
B Motion of satellite
C Motion of air particle
D Motion of snake

Answer:Motion of train running on a straight track
6 A body is moving along a straight line path with constant velocity. At an instant of time the distance travelled by it is S and its displacement is D, then
A D = S
B D > S
C D < S
D None of these

Answer:D = S
7 The displacement of a body is zero. The distance covered
A may or may not be zero
B is not zero
C is zero
D depends upon the acceleration

Answer:may or may not be zero
8 Which of the following can be zero, when a particle is in motion for some time?
A Displacement
B None of these
C Distance
D Speed

Answer:Displacement
9 The distance travelled by a body is directly proportional to the time taken. Its speed
A remains constant
B decreases
C increases
D becomes zero

Answer:remains constant
10 The acceleration of a moving body can be found from
A slope of the velocity- time graph
B slope of distance-time graph
C area under distance -time graph
D area under velocity - time graph

Answer:slope of the velocity- time graph
11 Two trains, each 40 m long are travelling in opposite direction with equal velocity 20 m/s. The time of crossing is
A 1 s
B 2 s
C 3 s
D 4 s

Answer:1 s
12 A body is thrown vertically upwards. If air resistance is to be taken into account, then the time during which the body rises is
A less than the time of fall
B greater than the time of fall
C twice the time of fall
D equal to the time of fall

Answer:less than the time of fall
13 The location of a particle has changed. What can we say about the displacement and the distance covered by the particle?
A Neither can be zero
B One may be zero
C Both may be zero
D 1.5 km/h

Answer:Neither can be zero
14 If distance covered by a particle is zero, what can you say about its displacement?
A It must be zero
B It cannot be zero
C It may or may not be zero
D It is negative

Answer:It must be zero
15 Acceleration of a particle changes when
A speed changes
B magnitude of velocity changes
C direction of velocity changes
D None of these

Answer:speed changes
16 What determines the nature of the path followed by the particle?
A Both
B Velocity
C Acceleration
D None of these

Answer:Both
17 The graph between displacement and time for a particle moving with uniform acceleration is a/an
A parabola
B ellipse
C straight line parallel to time axis
D straight line with a positive slope

Answer:parabola
18 The numerical ratio of displacement to distance for a moving object is
A equal to or less than 1
B always equal to 1
C always less than 1
D always more than 1

Answer:equal to or less than 1
19 The ratio of the numerical values of the average velocity and average speed of a body is
A unity or less
B less than unity
C unity
D unity or more

Answer:unity or less
20 A ball is bouncing elastically with a speed 1 m/s between walls of a railway compartment of size 10 m in a direction perpendicular to walls. The train is moving at a constant velocity of 10 m/s parallel to the direction of motion of the ball. As seen from the ground,
A the direction of motion of the ball changes every 10 seconds.
B speed of ball changes every 10 seconds.
C average speed of ball over any 20 second interval is fixed.
D the acceleration of ball is the same as from the train.

Answer:B, C, D

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