# KVPY (Kishore Vaigyanik Protsahan Yojana) Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics: Questions 128 - 131 of 268

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## Question number: 128

Appeared in Year: 2015

MCQ▾

### Question

A beam of monoenergetic electros, which have been accelerated from rest by a potential U, is used to from an interference pattern in a Young’s Double Slit experiment. The electrons are now accelerated by potential 4U. Then the fringe width;

### Choices

Choice (4) Response

a.

Remains the same.

b.

Is twice the original fringe width.

c.

Is half the original fringe width.

d.

Is one-fourth the original fringe width.

## Question number: 129

MCQ▾

### Question

1 g mole of an ideal gas at STP is subjected to a reversible adiabatic expansion to double its volume. Find the change in internal energy.

### Choices

Choice (4) Response

a.

1169.5 J

b.

969.5 J

c.

1069.72 J

d.

849.28 J

## Question number: 130

Appeared in Year: 2014

MCQ▾

### Question

A certain p-n junction, having a depletion region of width 20 µm, was found to have a breakdown voltage of 100 V. If the width of the depletion region is reduced to 1 µm during its production, then it can be used as a Zener diode for voltage regulation of –

### Choices

Choice (4) Response

a.

5 V

b.

2000 V

c.

7.5 V

d.

10 V

## Question number: 131

Appeared in Year: 2015

MCQ▾

### Question

An ac voltmeter connected between points A and B in the circuit below reads 36 V. If it is connected between A and C, the reading is 39 V. The reading when it is connected between B and D is 25 V. What will the voltmeter read when it is connected between A and D? (Assume that the voltmeter reads true ems voltage value and that the source generates a pure ac. )

### Choices

Choice (4) Response

a.

b.

c.

d.

f Page