NEET (National Eligibility cum Medical Entrance Test) Physics: Questions 978 - 981 of 2142

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Question number: 978

» Electromagnetic Waves » Electromagnetic Waves & Characteristics

MCQ▾

Question

A point source of 2 watt is radiating uniformly in all direction in vacuum. Find the amplitude of electric field at a distance 2m from it-

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

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.

Equation

b.

Equation

c.

Equation

d.

Equation

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