# NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1712 - 1717 of 2320

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## Question number: 1712

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MCQ▾

### Question

In NPN transistor the collector current is 10 mA . If 90 % of electrons emitted reach the collector, then

### Choices

Choice (4)Response

a.

Emitter current will be 9 mA

b.

Emitter current will be 11.1 mA

c.

Base current will be 0.01 mA

d.

Base current will be 0.1 mA

## Question number: 1713

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MCQ▾

### Question

The truth-table given below is for which ate?

 A B C 0 0 1 0 1 1 1 0 1 1 1 0

### Choices

Choice (4)Response

a.

OR.

b.

AND

c.

XOR

d.

NAND

## Question number: 1714

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MCQ▾

### Question

Correct statement for ‘NOR’ gate is that, it gives

### Choices

Choice (4)Response

a.

High output when both the inputs are low

b.

Low output when both the inputs are low

c.

High output when both the inputs are high

d.

All of the above

## Question number: 1715

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MCQ▾

### Question

The time period of a simple pendulum of length L as measured in an elevator descending with acceleration is

### Choices

Choice (4)Response

a.

b.

c.

d.

## Passage

Sound from a point isotropic source spreads equally in all directions in homogeneous medium. Therefore its intensity decreases with square of distance from the source. When distance between observer and the source changes, apart from changes in intensity, the observer listens sound of pitch higher or lower than actual pitch depending upon the fact that the distance between the observer and source is decreasing or increasing respectively. An observer O is at a distance 2R from center of a circle of radius R. A point isotropic sound source S moves on the circle with uniform angular velocity . Initially observer, source and Centre of the circle are in same line.

## Question number: 1716 (1 of 3 Based on Passage) Show Passage

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MCQ▾

### Question

Sound emitted by the source at two successive instants t 1 and t 2 has minimum and maximum observed pitch respectively, then -

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question number: 1717 (2 of 3 Based on Passage) Show Passage

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MCQ▾

### Question

During a complete round trip of star on the circle, the observer listens a sound, whose -

### Choices

Choice (4)Response

a.

During the first half time wavelength increases then decreases to the original value

b.

Wavelength first decreases to maximum value then increases to the original value

c.

Wavelength first increases to a maximum value then decreases to the original value

d.

Question does not provide sufficient data or is vague

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