NEET Physics: Questions 979 - 982 of 2098

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Question number: 979

» Ray Optics » Resolving Power of Microscopes and Astronomical Telescopes

MCQ▾

Question

A Galilean telescope consists of an objective of focal length 12 cm and eye-piece of focal length 4 cm. What should be the separation of the two lenses when the virtual image of a distant object is formed at a distance of 24 cm from the eye-piece?

Choices

Choice (4) Response

a.

8.2 cm.

b.

12.4 cm.

c.

7.2 cm

d.

2.8cm.

Question number: 980

» Electromagnetic Induction & Alternating Currents » Alternating Currents

Assertion-Reason▾

Assertion (Ꭺ)

A sinusoidal alternating current does not show any magnetic effects.

Reason (Ꭱ)

The average value of alternating current is zero.

Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

Both Ꭺ and Ꭱ are false

c.

Ꭺ is true but Ꭱ is false

d.

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

Question number: 981

» Electromagnetic Waves » Applications of Electromagnetic Waves

MCQ▾

Question

If λ ν, λ x and λ m represent the wavelength of visible light, x-rays, and microwaves respectively, then

Choices

Choice (4) Response

a.

λm>λν>λx

b.

λν>λx>λm

c.

λν>λm>λx

d.

λm>λx>λν

Question number: 982

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

Assertion-Reason▾

Assertion (Ꭺ)

The mirrors used in search lights are parabolic and not concave spherical.

Reason (Ꭱ)

In a concave spherical mirror the image formed is always virtual.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are false

b.

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

c.

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

d.

Ꭺ is true but Ꭱ is false

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