NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1874 - 1877 of 2184

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Question number: 1874

» Communication System » Propagation of Electromagnetic Waves in the Atmosphere

Edit
Assertion-Reason▾

Question

Assertion (Ꭺ)

Television signals are not received through sky-wave propagation.

Reason (Ꭱ)

The ionosphere reflects electromagnetic waves of frequencies greater than a certain critical frequency.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

b.

Ꭺ is true but Ꭱ is false

c.

Both Ꭺ and Ꭱ are false

d.

Ꭺ is false but Ꭱ is true

Question number: 1875

» Gravitation » Escape Velocity

Edit
MCQ▾

Question

Gas escapes from the surface of a planet because it acquires an escape velocity. The escape velocity will depend on which of the following factors:

(1) Mass of the planet

(2) Radius of the planet

(3) Mass of the particle escaping

(4) Temperature of the planet

Select the correct answers with mark it according to the following codes:

Choices

Choice (4) Response

a.

1 and 2 are correct

b.

1.2 and 3 are correct

c.

1 and 3 are correct

d.

1 and 4 are correct

Question number: 1876

» Gravitation » Energy

Edit
MCQ▾

Question

Two satellites P and Q of same mass are revolving near the earth surface in the equatorial plane. The satellite P moves in the direction of rotation of earth whereas Q moves in the opposite direction. The ratio of their kinetic energies with respect to a frame attached to earth will be –

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 1877

» Gravitation » Gravitational Potential

Edit
MCQ▾

Question

Two satellites S 1 and S 2 revolve round a planet in the same direction in circular orbits. Their periods of revolutions are 1 hour and 6 hour respectively. The radius of S 1 is 1.5 ⨯ 10 5 km. The velocity of S 2 with respect to S 1 will be

Choices

Choice (4) Response

a.

b.

c.

d.