NEET Physics: Questions 1865 - 1869 of 2099

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Question number: 1865

» Gravitation » Geo-Stationary Satellites

MCQ▾

Question

The moon revolves round the earth 13 times in one year. If the ratio of sun-earth distance to earth-moon distance is 393, then the ratio of masses of sun and earth will be –

Choices

Choice (4) Response
a.

356

b.

365

c.

1

d.

3.56 ⨯ 10 5

Question number: 1866

» Communication System » Sky and Space Wave Propagation

MCQ▾

Question

For sky wave propagation of a 10 MHz signal, what should be the minimum electron density in ionosphere,

Choices

Choice (4) Response
a.

~1022m3

b.

~1.2×1012m3

c.

~1014m3

d.

~106m3

Question number: 1867

» Experimental Skills » Focal Length

MCQ▾

Question

In an experiment to measure the focal length of a concave mirror, it was found that for an object distance of 0.30 m, the image distance come out to be 0.60 m. Determine the focal length.

Choices

Choice (4) Response
a.

(0.2 + 0.02) m

b.

(0.1 ± 0.01) m

c.

(0.2 ± 0.01) m

d.

(0.1 ± 0.02) m

Question number: 1868

» Oscillations and Waves » Standing Waves in Strings and Organ Pipes

MCQ▾

Question

The frequency of fundamental tone in an open organ pipe of length 0.48 m is 320 Hz. Speed of sound is 320 m/sec. Frequency of fundamental tone in closed organ pipe will

Choices

Choice (4) Response
a.

143.2 Hz

b.

320.0 Hz

c.

153.8 Hz

d.

160.0 Hz

Question number: 1869

» Oscillations and Waves » Doppler Effect in Sound

MCQ▾

Question

A police car moving at 22 m/s, chases a motorcyclist. The police man sounds his horn at 176 Hz, while both of them move towards a stationary siren of frequency 165 Hz. Calculate the speed of the motorcycle, if it is given that he does not observes any beats

Choices

Choice (4) Response
a.

33 m/s

b.

Zero

c.

11 m/s

d.

22 m/s

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