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
Answer:its acceleration is constant
2
Velocity time curve for a body projected vertically upwards is
Answer:straight line
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4
The slope of velocity-time graph for motion with uniform velocity is equal to
Answer:zero
5
Which of the following is a one dimensional motion ?
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
Answer:D = S
7
The displacement of a body is zero. The distance covered
Answer:may or may not be zero
8
Which of the following can be zero, when a particle is in motion for some time?
Answer:Displacement
9
The distance travelled by a body is directly proportional to the time taken. Its speed
Answer:remains constant
10
The acceleration of a moving body can be found from
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
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
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?
Answer:Neither can be zero
14
If distance covered by a particle is zero, what can you say about its displacement?
Answer:It must be zero
16
What determines the nature of the path followed by the particle?
Answer:Both
17
The graph between displacement and time for a particle moving with uniform acceleration is a/an
Answer:parabola
18
The numerical ratio of displacement to distance for a moving object is
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
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,
Answer:B, C, D
Chapters
- Physical World
- Units and measurements
- Motion in a straight line
- Motion in a plane
- Laws of motion
- Work energy and power
- System of particles and rotational motion
- Gravitation
- Mechanical properties of solids
- Mechanical properties of fluids
- Thermal properties of matter
- thermodynamics
- Kinetic theory
- Oscillations
- Waves
