Join WhatsApp ChannelDaily MCQs & Exam Updates
← Back to Chapter
Short Questions

Kinematics

9th Class | Physics | 40 Questions

Question 21

Define random motion with an example.

Answer:
Random motion occurs along an irregular and unpredictable path; the flight of a bee is an example.
Question 22

Define circular motion with an example.

Answer:
Circular motion is motion along a circle; a ball tied to a string and whirled is an example.
Question 23

Define rotatory motion with an example.

Answer:
In rotatory motion, each point of a body moves around a fixed axis; a rotating fan is an example.
Question 24

Define vibratory motion with an example.

Answer:
Vibratory motion is repeated to-and-fro motion about a fixed mean position; a swing is an example.
Question 25

Can distance be zero when displacement is non-zero?

Answer:
No. A non-zero displacement requires a change of position and therefore some distance must have been travelled.
Question 26

Can displacement be zero when distance is non-zero?

Answer:
Yes. After a round trip ending at the starting point, distance is non-zero but displacement is zero.
Question 27

Define instantaneous speed.

Answer:
Instantaneous speed is the speed of an object at a particular instant, such as the reading of a speedometer.
Question 28

Write the formula for average speed.

Answer:
Average speed = total distance covered / total time taken.
Question 29

Define uniform and non-uniform velocity.

Answer:
Velocity is uniform when both speed and direction remain constant. It is non-uniform if speed, direction or both change.
Question 30

Define acceleration and write its formula.

Answer:
Acceleration is the rate of change of velocity: a = (vf - vi)/t.