# NSTSE (National Science Talent Search Exam- Unified Council) Class 10: Questions 1020 - 1026 of 1484

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## Question number: 1020

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MCQ▾

### Question

A convex lens is made by cutting a portion of a hollow glass sphere of radius . So, power of the lens is:

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 1021

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MCQ▾

### Question

Two thin lenses of power and are placed in contact. The power of the lens combination is:

### Choices

Choice (4) Response

a.

2

b.

1.5

c.

1

d.

2.5

## Question number: 1022

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MCQ▾

### Question

Which of the following have maximum focal length?

### Choices

Choice (4) Response

a.

Convex mirror

b.

Concave mirror

c.

Convex lens

d.

Plane mirror

## Question number: 1023

Edit
MCQ▾

### Question

Focal length of the convex lens is:

### Choices

Choice (4) Response

a.

Always negative

b.

Sometime positive, sometime negative

c.

Always positive

d.

All of the above

## Question number: 1024

Edit
MCQ▾

### Question

If power of a lens is , then radius of the curvature of the lens is:

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 1025

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MCQ▾

### Question

By which of the following mirror we can get long and thin image?

### Choices

Choice (4) Response

a.

Cylindrical mirror

b.

Concave mirror

c.

Parabolic mirror

d.

Convex mirror

## Question number: 1026

Edit
MCQ▾

### Question

If an object is placed between focal point and centre of curvature of converging lens, then characteristics of its image will be:

### Choices

Choice (4) Response

a.

Real, inverting, diminished

b.

Virtual, upright, diminished

c.

Virtual, upright, enlarged

d.

Real, inverting, enlarged

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