NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1901 - 1906 of 2184

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Question number: 1901

» Oscillations and Waves » Harmonics

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MCQ▾

Question

A string on a musical instrument is 50 cm long and its fundamental frequency is 270 Hz. If the desired frequency of 1000 Hz, is to be produced, the required length of the string is

Choices

Choice (4) Response

a.

5.4 cm

b.

10.3 cm

c.

13.5 cm

d.

2.7 cm

Question number: 1902

» Communication System » Need for Modulation

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MCQ▾

Question

Range of frequencies allotted for commercial FM radio broadcast is,

Choices

Choice (4) Response

a.

8 to 88 MHz

b.

88 to 108 kHz

c.

88 to 108 MHz

d.

88 to 108 GHz

Question number: 1903

» Communication System » Need for Modulation

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MCQ▾

Question

An oscillator is producing FM waves of frequency 2 kHz with a variation of 10 kHz. What is the modulating index?

Choices

Choice (4) Response

a.

0.67

b.

0.20

c.

1.5

d.

5.0

Question number: 1904

» Communication System » Basic Elements of Communication System

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MCQ▾

Question

What should be the maximum acceptance angle at the air core interface of an optical fiber if n 1 and n 2 are the refractive indices of the core and the cladding respectively?

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 1905

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

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MCQ▾

Question

The frequency of fundamental tone in an open organ pipe of length 0.48 m is 430 Hz. Speed of sound is 430 m/sec. Frequency of fundamental tone in closed organ pipe will

Choices

Choice (4) Response

a.

260.0 Hz

b.

253.8 Hz

c.

243.2 Hz

d.

215 Hz

Question number: 1906

» Oscillations and Waves » Doppler Effect in Sound

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MCQ▾

Question

The speed of sound in air at a given temperature is 350 m/s. An engine blows whistle at a frequency of 1200 cps. It is approaching the observer with velocity50 m/s. The apparent frequency in cps heard by the observer will be

Choices

Choice (4) Response

a.

1050

b.

2400

c.

1400

d.

600