KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics: Questions 156 - 159 of 250

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Question number: 156

» Laws of Motion » Equilibrium of Concurrent Forces

MCQ▾

Question

An object is tied to a string and rotated in a vertical radius r. Constant speed is maintained along the trajectory. If TmaxTmin=3 , then, v2rg is –

(T indicates tension in the string)

Choices

Choice (4) Response

a.

1

b.

3

c.

4

d.

2

Question number: 157

» Work, Energy and Power » Work Done

MCQ▾

Question

A block of mass 15 kg slides down a rough slope which is inclined at 600 to the horizontal. The coefficient of sliding friction is 0.25. When the block has slid 10 m, the work done on the block by the force of friction is nearly,

Choices

Choice (4) Response

a.

321.4J

b.

187.5J

c.

150J

d.

115.75 J

Question number: 158

» Laws of Motion » Law of Conservation of Linear Momentum

MCQ▾

Question

A bob of mass 0.575 kg hangs from the massless string of a long simple pendulum. A bullet of mass 0.025 kg is fired vertically from below into the bob. The bullet gets embedded into the bob and the combination rises vertically through a height of 0.8 m. If g = 10 ms-2, then the velocity of the bullet is –

Choices

Choice (4) Response

a.

8ms1

b.

8000ms1

c.

800ms1

d.

80ms1

Question number: 159

» Oscillations and Waves » Harmonics

MCQ▾

Question

A wire with linear density of 0.006kgm is stretched between two rigid supports. Tension on the wire is 540 N. The wire resonates at 450 Hz. The next frequency at which wire resonates is 540 Hz. The length of the wire is –

Choices

Choice (4) Response

a.

3.5m

b.

2.75m

c.

1.67m

d.

2.12m

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