NEET Physics: Questions 1855 - 1859 of 2142

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Question number: 1855

» Oscillations and Waves » Doppler Effect in Sound

MCQ▾

Question

A source of sound of frequency n is moving towards a stationary observer with a speed S. If the speed of sound in air is V and the frequency heard by the observer is n 1, the value of Equation is,

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 1856

» Communication System » Amplitude and Frequency Modulation

MCQ▾

Question

In frequency modulation

Choices

Choice (4) Response

a.

The amplitude of modulated wave varies as amplitude of carrier wave

b.

The frequency of modulated wave varies as frequency of modulating wave

c.

The amplitude of modulated wave varies as frequency of carrier wave

d.

The frequency of modulated wave varies as amplitude of modulating wave

Question number: 1857

» Communication System » Sky and Space Wave Propagation

MCQ▾

Question

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

Choices

Choice (4) Response

a.

175 MHz

b.

190 MHz

c.

150 MHz

d.

170 MHz

Question number: 1858

» Gravitation » Gravitational Potential

Assertion-Reason▾

Assertion (Ꭺ)

Gravitational potential of earth at every place on it is negative.

Reason (Ꭱ)

Everybody on earth is bound by the attraction of earth.

Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

c.

Both Ꭺ and Ꭱ are false

d.

Ꭺ is true but Ꭱ is false

Question number: 1859

» Gravitation » Gravitational Acceleration

MCQ▾

Question

Two planets of radii in the ratio 1: 2 are made from the materials of density in the ratio 3: 1. Then the ratio of acceleration due to gravity g 1 /g 2 at the surface of two planets will be

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

1

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