# NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1874 - 1877 of 2247

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## Question number: 1874

Edit
Assertion-Reason▾

### 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

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

(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

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

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.

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