NEET (2024 Updated)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1086 - 1090 of 5119

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Question 1086

Question MCQ▾

Two thin lenses of focal length 60 & -20 cm in contact have a resultant focal length of,

Choices

Choice (4)Response

a.

-30 cm

b.

+ 15 cm

c.

-15 cm

d.

+ 30 cm

Edit

Question 1087

Question MCQ▾

A glass plate 4 mm thick is viewed from the above through a microscope. The microscope must be lowered 2.58 mm as the operator shifts from viewing the top surface to viewing the bottom surface through the glass. What is the index of refraction of the glass?

Choices

Choice (4)Response

a.

1.21

b.

1.61

c.

1.55

d.

3.24

Edit

Question 1088

Question MCQ▾

In a series LCR circuit capacitance is changed from C to 2C. For the resonant frequency to remain unchanged, the inductance would be changed from L to

Choices

Choice (4)Response

a.

b.

c.

2 L

d.

4 L

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Question 1089

Question MCQ▾

A slide projector lens has a focal length 10 cm. It throws an image of a 2cm × 2cm slide on a screen 5 m from the lens. Find the size of the picture on the screen

Choices

Choice (4)Response

a.

(88 × 88) cm2

b.

(98 × 98) cm2

c.

(78 × 78) cm2

d.

(64 × 64) cm2

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Question 1090

Question MCQ▾

An image is formed on the screen by a convex lens. When upper half part of lens is covered with black paper, then:

Choices

Choice (4)Response

a.

Half image is formed

b.

Full image is formed

c.

Intensity of image will be enhanced

d.

All of the above

Edit