NEET Physics: Questions 1847 - 1851 of 2098

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Question number: 1847

» Experimental Skills » Potentiometer

MCQ▾

Question

The potential gradient of a potentiometer can be increased by which of the following operation?

Choices

Choice (4) Response

a.

By increasing the area of cross-section of potentiometer wire.

b.

By decreasing the current through it.

c.

By using a wire of material of low specific resistance. when A is decreased, k will increase.

d.

By decreasing the area of cross-section of the potentiometer wire.

Question number: 1848

» Gravitation » Escape Velocity

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.

Vp=Ve6

b.

Vp=5Ve

c.

Vp=6Ve

d.

Ve=Ve6

Question number: 1849

» Oscillations and Waves » Doppler Effect in Sound

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.

384

b.

320

c.

182

d.

280

Question number: 1850

» Communication System » Sky and Space Wave Propagation

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.

120 MHz

b.

110 MHz

c.

109 MHz

d.

150 MHz

Passage

Read the passage given below and answer the questions that follow:

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: 1851 (1 of 3 Based on Passage) Show Passage

» Communication System » Sky and Space Wave Propagation

MCQ▾

Question

The critical frequency of the layer is

Choices

Choice (4) Response

a.

2.7 Hz

b.

2 Hz

c.

2.7 MHz

d.

2.78 kHz

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