NEET Physics: Questions 1048 - 1053 of 2099

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Question number: 1048

» Electromagnetic Induction & Alternating Currents » Power in AC Circuits

MCQ▾

Question

An alternating e. m. f. of angular frequency is applied across an inductance. The instantaneous power developed in the circuit has an angular frequency

Choices

Choice (4) Response
a.

ω2

b.

ω4

c.

ω

d.

2ω

Question number: 1049

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

Assertion-Reason▾

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. Ꭺ is true but Ꭱ is false
b. Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ
c. Ꭺ is false but Ꭱ is true
d. Both Ꭺ and Ꭱ are false

Question number: 1050

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

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 2 are correct

b.

1, 2 and 3 are correct

c.

1 and 3 are correct

d.

2 and 4 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

MCQ▾

Question

The critical frequency of the layer

Choices

Choice (4) Response
a.

2.7 x 10 6 Hz

b.

4.7x 10 6 Hz

c.

2.7 x 10 5 Hz

d.

4.8 x 10 5 Hz

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

» Electromagnetic Waves » Electromagnetic Spectrum » Radio Waves

MCQ▾

Question

The maximum useable frequency

Choices

Choice (4) Response
a.

4.57 x 10 9 Hz

b.

4.57 x l0 6 Hz

c.

3.17 x l0 6 Hz

d.

3.17 x 10 8 Hz

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