Kinematics-Average Speed and Instantaneous Velocity [NEET (2024 Updated)-National Eligibility cum Entrance Test (Medical) Physics]: Questions 65 - 69 of 143
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Question 65
Question Assertion-Reason▾
Assertion(Ꭺ)
Rain is falling vertically downwards with velocity 6 km/h. A man walks with a velocity of 8 km/h. Relative velocity of rain w. r. t. the man is 10 km/h.
Reason(Ꭱ)
Relative velocity is the ratio of two|velocities.
Choices
Choice (4) | Response | |
---|---|---|
a. | Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ | |
b. | Ꭺ is false but Ꭱ is true | |
c. | Ꭺ is true but Ꭱ is false | |
d. | Both Ꭺ and Ꭱ are false |
Question 66
Question MCQ▾
A body of mass 0.05 kg falls from a height of 5 meter into a pile of sand. The body penetrates the sand a distance of 5 cm before stopping. What force has the sand exerted on the body?
Choices
Choice (4) | Response | |
---|---|---|
a. | -196 N | |
b. | - 19.6 N | |
c. | -49 N | |
d. | 0.196 N |
Question 67
Question MCQ▾
A car of 1000 kg moving with a velocity of 18 km/hr is stopped by the brake force of 1000 N. The distance covered by it before coming to rest is –
Choices
Choice (4) | Response | |
---|---|---|
a. | 12.5 m | |
b. | 144 m | |
c. | 1 m | |
d. | 162 m |
Question 68
Question MCQ▾
A body of mass 20 kg moving with a velocity of 3 m/s, rebounds on a wall with same velocity. The impulse on the body is -
Choices
Choice (4) | Response | |
---|---|---|
a. | 30 Ns | |
b. | 120 Ns | |
c. | 60 Ns | |
d. | 180 Ns |
Question 69
Question MCQ▾
A ship is steaming towards east at a speed of 12 ms-1 . A woman runs across the deck at a speed of 5 ms-1 in the direction at right angles to the direction of motion of the ship i.e.. towards north. What is the velocity of the woman relative to sea?
Choices
Choice (4) | Response | |
---|---|---|
a. | 5 m/s | |
b. | 17 m/s | |
c. | 13 m/s | |
d. | 12 m/s |