NEET (NTA-National Eligibility cum Medical Entrance Test) Physics: Questions 1052 - 1056 of 2142

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Passage

Read the passage given below and answer the questions that follow:

The electron density of a layer of ionosphere at a height 150 km from the earth surface is 9 x 10 10 per m 3. For the sky wave transmission from this layer up to a range of 250 km, find

Question number: 1052 (3 of 3 Based on Passage) Show Passage

» Electromagnetic Waves » Electromagnetic Spectrum » Radio Waves

MCQ▾

Question

The angle of incidence of this layer

Choices

Choice (4) Response

a.

34.5°

b.

25.2°

c.

31.6°

d.

40°

Question number: 1053

» Electromagnetic Waves » Electromagnetic Waves & Characteristics

MCQ▾

Question

Which of the following are electromagnetic waves?

(1) Cosmic rays (2) Gamma rays

(3) X-rays (4) β-rays

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

Codes:

Choices

Choice (4) Response

a.

1 and 2 are correct

b.

1 and 3 are correct

c.

1, 2 and 3 are correct

d.

2 and 4 are correct

Question number: 1054

» Electromagnetic Waves » Electromagnetic Waves & Characteristics

MCQ▾

Question

A light beam travelling in the X-direction is described by the electric field

Equation . An electron is constrained to move along the Y-direction with a speed of 2.0 x 10 7 m/s. Find the maximum magnetic force (in N) on the electron.

Choices

Choice (4) Response

a.

3.2 x 10 -18

b.

5.1 x 10 -16

c.

6.5 x 10 -11

d.

7.8 x 10 -12

Question number: 1055

» Ray Optics » Deviation and Dispersion of Light by a Prism

MCQ▾

Question

The refractive index of the material of a prism is Equation and its prism angle is 30°. One of its refracting faces is polished. The incident beam of light will return back for the angle of incidence

Choices

Choice (4) Response

a.

45°

b.

c.

30°

d.

60°

Question number: 1056

» Ray Optics » Deviation and Dispersion of Light by a Prism

MCQ▾

Question

The wrong statements are

(1) The order of colors in the primary and the secondary rainbows is the same

(2) The intensity of colors in the primary and the secondary rainbows is the same

(3) The intensity of light in the primary rainbow is greater and the order of colors is the same than the secondary

(4) The intensity of light for different colors in primary rainbow is greater and the order of colors is reverse as that in the secondary rainbow

elect the correct answers and mark it according to the following codes:

Codes:

Choices

Choice (4) Response

a.

1 and 2 are correct

b.

2 and 4 are correct

c.

1 and 3 are correct

d.

1, 2 and 3 are correct

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