Kinematics [NEET (2024 Updated)-National Eligibility cum Entrance Test (Medical) Physics]: Questions 31 - 34 of 475
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Question 31
Question MCQ▾
if a particle travels a linear distance at speed v1 and comes back along the same track at speed v2 .
(1) Its average speed is arithmetic mean (v1 + v2) / 2
(2) Its average speed is harmonic mean 2 v1 v2 / (v1 + v2) /2
(3) Its average speed is geometric mean √ v1 v2
(4) Its average velocity is zero
Choices
Choice (4) | Response | |
---|---|---|
a. | 1 and 2 | |
b. | 1,2 and 3 | |
c. | 2 and 4 | |
d. | 1 and 3 |
Question 32
Question Assertion-Reason▾
Assertion(Ꭺ)
The acceleration of a body of mass 2 kg thrown vertically upwards is always constant.
Reason(Ꭱ)
A body of all mass group travels under constant acceleration when only gravity acts on it.
Choices
Choice (4) | Response | |
---|---|---|
a. | Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ | |
b. | Both Ꭺ and Ꭱ are false | |
c. | Ꭺ is false but Ꭱ is true | |
d. | Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ |
Question 33
Question MCQ▾
A particle moves along x-axis as x = 4 (t - 3) + a (t - 4)2
Which of the following is true?
Choices
Choice (4) | Response | |
---|---|---|
a. | The initial velocity of particle is 4 | |
b. | The acceleration of particle is 2a | |
c. | The particle is at origin at t = 0 | |
d. | None of the above |
Question 34
Question MCQ▾
a particle moving in a straight line covers half the distance with speed of 3 m/s. The other half of the distance is covered in two equal time intervals with speed of 4.5 m/s and 7.5 m/s respectively. The average speed of the particle during this motion is
Choices
Choice (4) | Response | |
---|---|---|
a. | 4.0 m/s | |
b. | 5.5 m/s | |
c. | 4.8 m/s | |
d. | 5.0 m/s |