# KVPY (Kishore Vaigyanik Protsahan Yojana) Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics: Questions 247 - 250 of 268

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## Question number: 247

MCQ▾

### Question

An 8 kg block of ice, released from rest at the top of a 2.1 m long smooth ramp, slides down and falls with a velocity 3.3 ms-1. Find angle of the ramp with horizontal.

### Choices

Choice (4) Response

a.

220

b.

260

c.

150

d.

120

## Question number: 248

Appeared in Year: 2014

MCQ▾

### Question

An electron enters a parallel plate capacitor with horizontal speed u and is fond to deflect by angle θ on leaving the capacitor as shown. It is found that and gravity is negligible,

If the initial horizontal speed is doubled, then tan θ will be,

### Choices

Choice (4) Response

a.

0.2

b.

0.8

c.

0.1

d.

1.6

## Question number: 249

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

MCQ▾

### Question

Two circular glass plates each of radius R = 15 cm are pressed together with a liquid film of thickness. 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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