NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1898 - 1902 of 2320

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Question number: 1898

» Gravitation » Kepler's Laws of Planetary Motion

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MCQ▾

Question

The mass and radius of earth and moon are M 1, R 1 and M 2, R 2 respectively. Their centers are d distance apart. With what velocity should a particle of mass m be projected from the mid-point of their centers so that it may escape out to infinity–

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 1899

» Gravitation » Universal Law of Gravitation

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Question

If the period of revolution of an artificial satellite just above the earth be T second and the density of earth be ρ, kg/m 3 then

(G = 6.67 ⨯ 10 -11 m 3 /kg. second 2)

Choices

Choice (4)Response

a.

ρT 2 varies with time

b.

c.

ρT 2 is a universal constant

d.

Both b. and c. are correct

Question number: 1900

» Communication System » Bandwidth of Transmission Medium

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Question

The characteristic impedance of a coaxial cable is of the order of,

Choices

Choice (4)Response

a.

50Ω

b.

200Ω

c.

270Ω

d.

All of the above

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

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