Communication System-Propagation of Electromagnetic Waves in the Atmosphere (NEET Physics): Questions 1 - 5 of 8

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Question number: 1

» Communication System » Propagation of Electromagnetic Waves in the Atmosphere

MCQ▾

Question

The vernier constant of two vernier calipers A and B are 0.01 cm and 0.01 mm respectively. Which one can measure the length of an object more accurately?

Choices

Choice (4) Response

a.

Accuracy in measurement does not depend on vernier constant

b.

Vernier B

c.

Vernier A

d.

All of the above

Question number: 2

» Communication System » Propagation of Electromagnetic Waves in the Atmosphere

MCQ▾

Question

One cm on the main scale of a vernier calipers is divided into ten equal parts. If 20 divisions of vernier scale coincide with 8 small divisions of the main scale. What will be the least count of calipers?

Choices

Choice (4) Response

a.

0.05 cm

b.

0.06 cm

c.

0.04 cm

d.

0.01 cm

Question number: 3

» Communication System » Propagation of Electromagnetic Waves in the Atmosphere

MCQ▾

Question

The figure shows a situation when the jaws of vernier are touching each other. Each main scale division is of 1 mm. Find zero correction.

The image is Vernier Calipers

The Image Is Vernier Calipers

A situation when the jaws of vernier are touching each other.

Choices

Choice (4) Response

a.

+ 0.5 mm

b.

+ 0.4 mm

c.

- 0.4 mm

d.

- 0.5 mm

Question number: 4

» Communication System » Propagation of Electromagnetic Waves in the Atmosphere

MCQ▾

Question

In short wave communication which of the following frequencies will be reflected back by the ionosphere layer, having electron density 5 ⨯ 10 9 per m 3.

Choices

Choice (4) Response

a.

0.18 MHz

b.

0.14 MHz

c.

0.28 MHz

d.

0.63 MHz

Question number: 5

» Communication System » Propagation of Electromagnetic Waves in the Atmosphere

MCQ▾

Question

In short wave communication which of the following frequencies will be reflected back by the ionosphere layer, having electron density 10 11 per m 3

Choices

Choice (4) Response

a.

18.1 MHz

b.

10.42 MHz

c.

12.24 MHz

d.

2.84 MHz

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