Rotational Motion-Torque [NEET (2024 Updated)-National Eligibility cum Entrance Test (Medical) Physics]: Questions 16 - 21 of 36
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Question 16
Question MCQ▾
An automobile engine develops 100 kW when rotating at a speed of 1500 rev/min. What torque does it deliver?
Choices
Choice (4) | Response | |
---|---|---|
a. | 531 N-m | |
b. | 350 N-m | |
c. | 440 N-m | |
d. | 637 N-m |
Question 17
Question MCQ▾
A torque of 20 N-m is applied on a 5 kg wheel whose moment of inertia is 2kg-m2 for 10 sec. The angle covers by the wheel in 10 sec will be
Choices
Choice (4) | Response | |
---|---|---|
a. | 750 rad | |
b. | 500 rad | |
c. | 3000 rad | |
d. | 6000 rad |
Question 18
Question MCQ▾
A thin wire of length L and uniform linear mass density ρ is bent into a circular loop with center at O as shown in figure. The moment of inertia of the loop about the axis XX is
Choices
Choice (4) | Response | |
---|---|---|
a. | ||
b. | ||
c. | ||
d. |
Question 19
Question MCQ▾
A flywheel of mass 25 kg has a radius of 0.3 m. What force should be applied tangentially to the rim of the flywheel so that it acquires an angular acceleration of 4 rad s-2?
Choices
Choice (4) | Response | |
---|---|---|
a. | 11.2 N | |
b. | 6.8 N | |
c. | 2.6 N | |
d. | 7.5 N |
Question 20
Question MCQ▾
The torque required to stop a wheel of moment of inertia from a speed of 40 rad s-1 in 10 s is,
Choices
Choice (4) | Response | |
---|---|---|
a. | 8 ⨯ 10-3 Nm | |
b. | 8 Nm | |
c. | 0.8 Nm | |
d. | 0.08 Nm |
Question 21
Question Assertion-Reason▾
Assertion(Ꭺ)
The force of fiction in the case of a disc rolling without slipping down an inclined plane is .
Reason(Ꭱ)
When the disc rolls without slipping, friction is required because for rolling condition velocity of point of contact is zero.
Choices
Choice (4) | Response | |
---|---|---|
a. | Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ | |
b. | Ꭺ is true but Ꭱ is 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 |