Chapter 8: Motion (Assertion and Reason) part 1

Physics Assertion-Reasoning Quiz

111. Assertion (A): The distance-time graph for an object moving with uniform speed is a straight line.
Reason (R): In uniform motion, the object covers equal distances in equal intervals of time.

(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.

112. Assertion (A): A stone moving in a circular path with constant speed is not experiencing acceleration.
Reason (R): The direction of velocity remains constant throughout the motion.

(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.

113. Assertion (A): The area under a velocity-time graph represents the displacement of an object.
Reason (R): The area under the graph is always proportional to the velocity of the object.

(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.

114. Assertion (A): When a car accelerates uniformly from 18 km/h to 36 km/h in 5 seconds, its acceleration is 1 m/s².
Reason (R): Acceleration is the change in velocity divided by the time taken.

(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.

115. Assertion (A): The distance travelled by an object is proportional to the time in uniform motion.
Reason (R): In uniform motion, velocity remains constant throughout the motion.

(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.

116. Assertion (A): The velocity-time graph for uniformly accelerated motion is a straight line.
Reason (R): In uniformly accelerated motion, velocity increases by equal amounts in equal intervals of time.

(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.

117. Assertion (A): An object in uniform circular motion experiences a force directed towards the center of the circular path.
Reason (R): This force is called centripetal force, and it is responsible for maintaining circular motion.

(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.

118. Assertion (A): The total distance travelled by a body is equal to the displacement in uniform motion.
Reason (R): In uniform motion, the path of the body is straight.

(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.

119. Assertion (A): The change in velocity is not always equal to the change in speed.
Reason (R): Speed is a scalar quantity, whereas velocity is a vector quantity.

(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.

120. Assertion (A): In the equation v=u+at, the variable v represents the final velocity.
Reason (R): The equation describes motion under uniform acceleration.

(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.

Assertion and reason Part 2