NEET (National Eligibility cum Medical Entrance Test) Physics: Questions 992 - 994 of 2142

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Question number: 992

» Electromagnetic Waves » Electromagnetic Waves & Characteristics

MCQ▾

Question

An electromagnetic wave of frequency ν = 3.0 MHz passes from vacuum into a dielectric medium with permittivity ϵ r = 4.0. Then the wrong statements are

(1) Wavelength is doubled and the frequency remains unchanged

(2) Wavelength is doubled and frequency becomes half

(3) Wavelength and frequency both remain unchanged

(4) Wavelength is halved and frequency remains unchanged

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

Codes:

Choices

Choice (4) Response

a.

1, 2 and 3 are correct

b.

1 and 3 are correct

c.

2 and 4 are correct

d.

1 and 2 are correct

Question number: 993

» Ray Optics » Resolving Power of Microscopes and Astronomical Telescopes

MCQ▾

Question

A vertical microscope is focused on a point at the bottom of an empty tank. Water (μ = 4/3) is then poured into the tank. The height of the water column is 4 cm. Another lighter liquid, which does not mix with water and which has refractive index 3/2 is then poured over the water. The height of liquid column is 2cm. What is the vertical distance through which the microscope must be moved to bring the object in focus again?

Choices

Choice (4) Response

a.

1.55 cm

b.

2.61 cm

c.

1.67 cm

d.

3.12 cm

Question number: 994

» Electromagnetic Waves » Electromagnetic Waves & Characteristics

MCQ▾

Question

Electromagnetic waves travel in a medium which has relative permeability 1.3 and relative permittivity 2.14. Then the speed of the electromagnetic wave in the medium will be

Choices

Choice (4) Response

a.

1.8 x 10 2 m/s

b.

1.8 x 10 8 m/s

c.

13.6 x 10 6 m/s

d.

3.6 x 10 8 m/s

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