NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1049 - 1054 of 2184

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Question number: 1049

» Ray Optics » Reflection and Refraction of Light » Smooth Surface

Edit
Assertion-Reason▾

Question

Assertion (Ꭺ)

Convex mirror is preferred to a plane mirror, in vehicles, to observe traffic coming from behind.

Reason (Ꭱ)

A convex mirror provides wider field of view, then a plane mirror of the same size.

Choices

Choice (4) Response

a.

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

b.

Ꭺ is false but Ꭱ is true

c.

Both Ꭺ and Ꭱ are false

d.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

Question number: 1050

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

Edit
MCQ▾

Question

Dispersive power does not depend upon

(1) The shape of prism

(2) Angle of prism

(3) Height of the prism

(4) Material of prism

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

Codes:

Choices

Choice (4) Response

a.

1 and 3 are correct

b.

2 and 4 are correct

c.

1 and 2 are correct

d.

1,2 and 3 are correct

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: 1051 (1 of 3 Based on Passage) Show Passage

» Electromagnetic Waves » Electromagnetic Spectrum » Radio Waves

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MCQ▾

Question

The critical frequency of the layer

Choices

Choice (4) Response

a.

2.7 x 10 6 Hz

b.

2.7 x 10 5 Hz

c.

4.8 x 10 5 Hz

d.

4.7x 10 6 Hz

Question number: 1052 (2 of 3 Based on Passage) Show Passage

» Electromagnetic Waves » Electromagnetic Spectrum » Radio Waves

Edit
MCQ▾

Question

The maximum useable frequency

Choices

Choice (4) Response

a.

3.17 x l0 6 Hz

b.

3.17 x 10 8 Hz

c.

4.57 x l0 6 Hz

d.

4.57 x 10 9 Hz

Question number: 1053 (3 of 3 Based on Passage) Show Passage

» Electromagnetic Waves » Electromagnetic Spectrum » Radio Waves

Edit
MCQ▾

Question

The angle of incidence of this layer

Choices

Choice (4) Response

a.

34.5°

b.

40°

c.

25.2°

d.

31.6°

Question number: 1054

» Electromagnetic Waves » Electromagnetic Waves & Characteristics

Edit
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.

2 and 4 are correct

d.

1,2 and 3 are correct