NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1004 - 1009 of 2184

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Question number: 1004

» Ray Optics » Lens Maker's Formula and Lens Formula

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MCQ▾

Question

A 35 mm film is to be projected on a 20 m wide screen situated at a distance of 40 m from the film-projector. Calculate the focal length of projection lens.

Choices

Choice (4) Response

a.

70 mm

b.

20 mm

c.

40 mm

d.

35 mm

Question number: 1005

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

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MCQ▾

Question

The angle θ between two plane mirrors producing five images of a given object is given by.

Choices

Choice (4) Response

a.

30° < θ < 72°

b.

60° < θ < 72°

c.

45° < θ < 72°

d.

15° < θ < 72°

Question number: 1006

» Electromagnetic Waves » Electromagnetic Spectrum » X-Rays

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MCQ▾

Question

If λ = 10 Å, then it correspond to

Choices

Choice (4) Response

a.

Ultraviolet waves

b.

Infrared waves

c.

Microwaves

d.

X-rays

Question number: 1007

» Electromagnetic Waves » Electromagnetic Waves & Characteristics

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MCQ▾

Question

The intensity of light from a source is . Find the amplitude of electric field in this-wave-

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 1008

» Electromagnetic Induction & Alternating Currents » LCR Series Circuit

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MCQ▾

Question

A series LCR arrangement with X L =80Ω, X C = 50Ω, R = 40Ω is applied across a. c. source of 200 V. Choose the correct options.

(1) Wattless current = 3.2 A

(2) Power current = 3.2 A

(3) Power factor = 0.6

(4) Impedance of circuit = 50 Ω

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

Codes:

Choices

Choice (4) Response

a.

2 and 4 are correct

b.

1 and 2 are correct

c.

1 and 3 are correct

d.

1,2 and 3 are correct

Question number: 1009

» Electromagnetic Waves » Electromagnetic Spectrum » Ultraviolet

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Assertion-Reason▾

Question

Assertion (Ꭺ)

Ultraviolet radiations are of higher frequency waves and are dangerous to human being.

Reason (Ꭱ)

Ultraviolet radiations are absorbed by the atmosphere.

Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

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

c.

Ꭺ is true but Ꭱ is false

d.

Both Ꭺ and Ꭱ are false