KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics: Questions 249 - 250 of 250

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Question number: 249

» Oscillations and Waves » Harmonics

MCQ▾

Question

A wire with linear density of 0.005 kg/m is stretched between two rigid supports. Tension on the wire is 450 N. The wire resonates at 320 Hz. The next frequency at which wire resonates is 360 Hz. The length of the wire is –

Choices

Choice (4) Response

a.

3.75 m

b.

2.0 m

c.

3.0 m

d.

3.25 m

Question number: 250

» Properties of Solids & Liquids » Application of Surface Tension

MCQ▾

Question

Two circular glass plates each of radius R = 15 cm are pressed together with a liquid film of thickness d=2.5×106m . Assuming that the liquid completely wets the glass plates, compute the force normal to plates required to pull them apart. S. T. of liquid = 0.070 N/m.

Choices

Choice (4) Response

a.

3.95 N

b.

2.15 N

c.

4.25 N

d.

2.86 N

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