NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 993 - 996 of 2142

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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

Question number: 995

» Ray Optics » Snell's Law

Assertion-Reason▾

Assertion (Ꭺ)

The focal length of a lens is different for all colors of light

Reason (Ꭱ)

The focal length depends only upon the material of the lens.

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: 996

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

MCQ▾

Question

A prism of dispersive power 0.021 and refractive index 1.53 form an achromatic combination with prism of angle 4.2° and dispersive power 0.045 having refractive index 1.65. Find the resultant deviation.

Choices

Choice (4) Response

a.

4.18°

b.

2.16°

c.

1.12°

d.

3.12°

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