## Physics Quiz-12

Assertion - Reasoning Type

If an object changes its position with respect to its surroundings with time, then it is called in motion. It is a change in the position of an object over time. Motion in a straight line is nothing but linear motion. As the name suggests, it’s in a particular straight line, thus it can be said that it uses only one dimension.

Q1.
•  Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1
•  Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1
•  Statement 1 is True, Statement 2 is False
•  Statement 1 is False, Statement 2 is True
Solution
Here, u=0,a=10ms^(-2),s=40/2=20m
Using the relation v^2=u^2+2as=0+2×10×20=400 or v=20ms^(-1). Thus both the Assertion and Reason are correct and Reason is the correct explanation of Assertion.

Q2.
•  Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1
•  Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1
•  Statement 1 is True, Statement 2 is False
•  Statement 1 is False, Statement 2 is True
Solution
When there is retardation, velocity decreases. So retardation is equal to the time rate of decrease of velocity. This retardation will be oppositely directed to velocity.

Q3.
•  Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1
•  Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1
• Statement 1 is True, Statement 2 is False
• Statement 1 is False, Statement 2 is True
Solution
When there is retardation, velocity decreases. So retardation is equal to the time rate of decrease of velocity. This retardation will be oppositely directed to velocity.

Q4.
•  Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1
•  Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1
•  Statement 1 is True, Statement 2 is False
•  Statement 1 is False, Statement 2 is True
Solution
The displacement is the shortest distance between initial and final position. When final position of a body coincides with its initial position, displacement is zero, but the distance travelled is not zero.

Q5.
•  Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1
•  Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1
•  Statement 1 is True, Statement 2 is False
•  Statement 1 is False, Statement 2 is True
Solution

Q6.
•  Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1
•  Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1
•  Statement 1 is True, Statement 2 is False
•  Statement 1 is False, Statement 2 is True
Solution
A body having positive acceleration can be associated with slowing down, as time rate of change of velocity decreases, but velocity increases with time, from graph it is clear that slope with time axis decreases in speed i.e. retardation in motion.

Q7.
• Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1
• Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1
•  Statement 1 is True, Statement 2 is False
•  Statement 1 is False, Statement 2 is True
Solution
Position- time graph for a stationary object is a straight line parallel to time axis showing that no change in position with time.

Q8.
• Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1
• Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1
• Statement 1 is True, Statement 2 is False
•  Statement 1 is False, Statement 2 is True
Solution
An object is said to be in uniform motion if it undergoes equal displacement in equal intervals if time

and v_ins=s/t
thus, in uniform motion average and instantaneous velocities have same value and body moves with constant velocity.

Q9.

•  Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1
•  Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1
•  Statement 1 is True, Statement 2 is False
•  Statement 1 is False, Statement 2 is True
Solution
In uniform motion the object moves with uniform velocity, the magnitude of its velocity at different instant i.e. at t=0,t=1sec,t=2 sec,….will always be constant. Thus velocity-time graph for an object in uniform motion along a straight path is a straight line parallel to time axis.
Q10.

• Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1
• Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1
•  Statement 1 is True, Statement 2 is False
• Statement 1 is False, Statement 2 is True
Solution
The uniform motion of a body means that the body is moving with constant velocity, but if the direction of motion is changing (such as in uniform circular motion), its velocity changes and thus acceleration is produced in uniform motion.

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