# Physics [NSTSE (National Science Talent Search Exam- Unified Council) Class 10]: Questions 1 - 7 of 154

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## Question 1

Physics

### Question

MCQ▾

The magnification and focal length of a converging lens are and , respectively. The object distance should be:

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question 2

Physics

### Question

MCQ▾

An image is formed on the centre of the curvature by convex lens, then the object is:

### Choices

Choice (4)Response

a.

At focal point

b.

Far than centre of curvature

c.

At centre of the curved

d.

Between focal point and centre of the curvature

## Question 3

Physics

### Question

MCQ▾

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 4

Physics

### Question

MCQ▾

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 5

Physics

### Question

MCQ▾

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 6

Physics

### Question

MCQ▾

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 7

Physics

### Question

MCQ▾

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

### Choices

Choice (4)Response

a.

b.

c.

d.

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