# NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1849 - 1855 of 2184

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## Question number: 1849

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MCQ▾

### Question

Acceleration due to gravity on a planet is 12 times the value on the earth. Escape velocity for the planet and the earth are V p and V e respectively. The ratio of the radii of the planet and the earth is 2: 1, then –

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 1850

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MCQ▾

### Question

A whistle sends out 210 waves in a second. If the whistle approaches the observer with velocity 1/4 of the velocity of sound in air, the number of waves per second the observer will receive

### Choices

Choice (4) Response

a.

320

b.

182

c.

384

d.

280

## Question number: 1851

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MCQ▾

### Question

Maximum usable frequency (MUF) in F-region layer is x, when the critical frequency is 55 MHz and the angle of incidence is 60°. Then x is (cos 70° = 0.34)

### Choices

Choice (4) Response

a.

109 MHz

b.

110 MHz

c.

120 MHz

d.

150 MHz

## Passage

The electron density of a layer of ionosphere at a height 150 km from the earth’s surface is 9 ⨯ 10 9 per m 3. For the sky transmission from this layer up to a range of 250 km,

## Question number: 1852 (1 of 3 Based on Passage) Show Passage

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MCQ▾

### Question

Angle of incidence of this layer is

### Choices

Choice (4) Response

a.

b.

c.

0 0

d.

## Question number: 1853 (2 of 3 Based on Passage) Show Passage

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MCQ▾

### Question

Maximum usable frequency is,

### Choices

Choice (4) Response

a.

3.5 ⨯ 10 10 Hz

b.

3.5 ⨯ 10 3 Hz

c.

3.5 ⨯ 10 6 HZ

d.

3.5 Hz

## Question number: 1854 (3 of 3 Based on Passage) Show Passage

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MCQ▾

### Question

The critical frequency of the layer is

### Choices

Choice (4) Response

a.

2.78 kHz

b.

2.7 MHz

c.

2.7 Hz

d.

2 Hz

## Question number: 1855

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MCQ▾

### Question

Four diodes shown in the following diagrams, which one is reverse biased?

### Choices

Choice (4) Response

a. Diagram of Diode and Resistance Choice A Figure shows the circuit diagram, in which pn-junction diode connected with resistance between two different potential.

b. Diagram of Diode and Resistance Choice B Figure shows the circuit diagram, in which pn-junction diode connected with resistance between two different potential.

c. Diagram of Diode and Resistance Choice C Figure shows the circuit diagram, in which pn-junction diode connected with resistance between two different potential.

d. Diagram of Diode and Resistance Choice D Figure shows the circuit diagram, in which pn-junction diode connected with resistance between two different potential.