Kinematics: Physics Chapter 2 Short Questions And MCQs for Class 9
This post contains Physics Chapter 2 MCQs for Class 9 students. This chapter’s name is Kinematics. Students of 9th class who are looking for Physics Notes for Class 9 can prepare these MCQs for the exams. These Physics Multiple Choice Questions are for the practice of 9th Class students.
Kinematics: Physics Chapter 2 MCQs for Class 9
1. A ball is thrown vertically upward, its velocity at the highest point is:
(a) -10mS-¹
(b) 10mS-¹
(c) Zero
(d) 100mS-¹
2. The motion of a body about an axis is called_____________.
(a) Circular Motion
(b) Vibratory Motion
(c) Rotational Motion
(d) Random Motion
3. A body has translatory motion if it moves along a:
(a) Straight line
(b) Circle
(c) Line without rotation
(d) Curved path
4. By dividing displacement of a moving body with time, we obtain______.
(a) Speed
(b) acceleration
(c) velocity
(d) Curved path
5. Which of the following is a vector quantity?
(a) Speed
(b) Distance
(c) Displacement
(d) Power
6. The motion of a body in a straight line is ________.
(a) Random motion
(b) Circular motion
(c) Linear motion
(d) Translatory motion
7. A type of motion in which a body moves about its own axis is called:
(a) Vibratory motion
(b) Rotatory Motion
(c) Circular Motion
(d) Random Motion
8. A car is moving at a speed of 10 ms-¹. Its speed in Kmh-¹ will be________.
(a) 100 Kmh-¹
(b) 50 Kmh-¹
(c) 36 Kmh-¹
(d) 72 Kmh-¹
9. Which is not a scalar quantity?
(a) Speed
(b) Distance
(c) Displacement
(d) Power
10. A train is moving at a speed of 36 Kmh-¹. Its speed expressed in ms-¹ will be:
(a) 10ms-¹
(b) 20ms-¹
(c) 25ms-¹
(d) 30ms-¹
11. Brownian motion is an example of:
(a) Random motion
(b) Linear motion
(c)Circular motion
(d)Vibratory motion
12. Change in position from point A to B with a short interval of time is called:
(a) Distance
(b) Displacement
(c) Velocity
(d) Speed
13. Which of the following is a vector quantity?
(a) Speed
(b) Distance
(c) Displacement
(d) Power
14. A change in position in the proper direction is called:
(a) Speed
(b) Velocity
(c) Displacement
(d) Distance
15. The number of perpendicular components of a force is:
(a) 3
(b) 1
(c) 2
(d) 4
16. The motion of insects is called:
(a) random motion
(b) circular motion
(c) rotatory motion
(d) vibratory motion
17. The to and fro motion of a body about its mean position is called:
(a) Rotatory motion
(b) Random motion
(c) Vibratory motion
(d) Circular motion
Kinematics: Physics Chapter 2 Short Questions for Class 9
Q.1: A car travelling at 10 mS-¹ accelerates uniformly at 2mS-². Calculate its velocity after 5 seconds. Solution.
Vi = 10 mS-¹
a = 2 ms-²
t = 5s
Vf = ?
Using the equation: Vf = Vi + at
Vf = Vi + at
Vf = 10 mS-¹ + 2 ms-² x 5s
The velocity of the car after 5s is 20 mS-¹
Question No.2 What would be the shape of a speed-time graph of a body moving with variable speed?
Ans. The shape of the velocity-time graph in zigzag when the body was variable speed.
Questions No.3. Define Random motion.
Ans. The disordered or irregular motion of an object is called random motion.
Questions No.4. Define rotatory motion and give an example.
Ans. The spinning motion of a body about its axis is called its rotatory motion.
Question No.5 Differentiate between speed and velocity.
Ans. Speed: The distance covered by an object in unit time is called its speed.
Velocity: A body has uniform speed if it covers equal distances in equal distances in equal intervals of time however short the interval may be.
Question No.6 Define vector and write the name of two vector quantities.
Ans. A vector quantity is described completely by its magnitude and direction.
Vector quantities:
- Displacement, velocity
- Acceleration, force
Questions No.7. How can vectorquantities be represented graphically.
Ans. Graphically, A vector quantity is represented by a straight line, with arrow-head at it one end. The length of its straight line represents the magnitude and arrow-head shows the direction of the vector.
Questions No.8 Differentiate between linear and random motion.
Ans. Linear motion: Straight line motion of a body is known as its linear motion.
Random motion: The disordered or irregular motion of an object is called random motion.
Questions No.9. Can a body moving at a constant speed have acceleration?
Ans. Yes, it is possible. The uniform circular motion is an example of a body which moves with constant speed.
Question No.10. Differentiate between scalar and vector.
Ans. A scalar quantity is described completely by its magnitude only.
Vector: A vector quantity is described completely by magnitude and direction.
Question No.11. What would be the shape of the speed-time graph of moving with variable speed?
Ans. The shape of the velocity-time graph is zigzag when the body has variable speed.
Question No.12.Define acceleration.
Ans. Acceleration is defined as the rate of change of velocity of a body.
Question No.13: What is meant by positive acceleration and negative acceleration.
Positive acceleration: Acceleration of a body is positive if its velocity increases with time, is called positive acceleration.
Negative acceleration: Acceleration of a body is negative if the velocity of the body decreases with time is called negative acceleration.
Question No.14: What is meant by Kinematics?
Ans. Kinematics is the study of the motion of an object without discussing the cause of motion.
Question No.15: Write the difference between circular and vibratory motion.
Ans. Circular motion: The motion of an object in a circular path is known as circular motion.
Vibratory motion: To and fro motion of a body about its mean position is known as vibratory motion.
Question No.16: Define rest and motion.
Ans. If a body is changing its position according to its surroundings is said to be in motion and if a body is not changing its position with respect to its surrounding is said to be in rest.
