For question no's 11,12,13.14
Assertion (A) and Reason (R) type
a) Both A and R are true 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 and R is also false.
11. Assertion (AT: Displacement of a body may be zero when distance travelled by it is not
zero
Reason (RXThe displacement is the longest distance between initial and final position
12. Assertion (A): Linear momentum is conserved in both elastic and in elastic collisions.
Reason (R)
: Total energy is conserved in all collisions.
13. Assertion (A): The work done during a round trip is zero.
Reason (R) : During the round trip the initial and final point is the same.
14. Assertion (A): A spring has potential energy both when it is compressed or stretched.
Reason (R) : In compressing or stretching work is done on the spring against the restoring
force.
Answers
Explanation:
11. Assertion(A) : Displacement of a body may be zero when distance travelled by it is not zero.
Reason(B) : The displacement is the longest distance between initial and final position.
Here, if the concept is known to you, displacement is the shortest distance travelled by the particle between final and initial positions.
So, A is True but R is False. Hence (c) part.
Assertion (A): Linear momentum is conserved in both elastic and in elastic collisions.
Reason (R) : Total energy is conserved in all collisions.
According to Linear conservation of momentum, energy is conserved in every body.
Hence A and R are true and R is the correct explanation of A.
13. Assertion (A): The work done during a round trip is zero.
Reason (R) : During the round trip the initial and final point is the same.
Yes, true because displacement is zero if we return back to initial position.
So, whether an athelete runs 2×10²⁰⁰ metres and returns to where he started, he has done zero work according to science.
Hence A and R are true and R is the correct explanation of A.
Assertion (A): A spring has potential energy both when it is compressed or stretched.
Reason (R) : In compressing or stretching work is done on the spring against the restoring force.
Yes, the explanation is absolutely correct. The potential energy is denoted by mgh, and does not vanish when a spring is stretched and released.
Hence A and R are true and R is the correct explanation of A.
[A tip:- Whenever assertion and reason is correct, note it down as assertion can alone come in give reason questions, so that you can smartly write back the reason as well.]
Answer:
1]
Assertion is true whereas reason is false
2]
Assertion is true and reason is correct Explanation of assertion
3]
Both assertion and reason are correct and reason is the correct explanation of Assertion
4]
Both assertion and reason are correct and reason is the correct explanation of Assertion
Read More :-
Shortest distance is known as displacement.
Potential energy is the product of mass, height and acceleration
Work done by a round tip is 0
Displacement may 0 when the object doesn't move.