## Physics Quiz-15

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
An object is said to be in uniform motion if it undergoes equal displacement in equal intervals if time
∴v_av=(s_1+s_2+s_3+⋯)/(t_1+t_2+t_3+⋯)=(s+s+s+⋯)/(t+t+t+⋯)=ns/nt=s/t
and v_ins=s/t
thus, in uniform motion average and instantaneous velocities have same value and body moves with constant velocity

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
Since slope of displacement-time graph measures velocity of an object.

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
Such a body can move along any curved path including circular path.

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
Motion of rocket is based on action reaction phenomena and is governed by rate of fuel burning causing the change in momentum of ejected gas.

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
The position-time graph of a moving body in one dimension can have negative slope if its velocity in negative.

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
Two different physical quantities may have same dimensions.

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
The average velocity of the body may be equal to its instantaneous velocity, because instantaneous velocity can take any value.
For a given time interval of a given motion, both average velocity and average speed can have only one value as displacement and distance will have single values.

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
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.

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
Motion of rocket is based on action reaction phenomena and is governed by rate of fuel burning causing the change in momentum of ejected gas.
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
Acceleration =   (change in velocity)/(time taken)
=(25-(-25))/5=10ms^(-2).
Hence assertion is wrong but Reason is correct.

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