# Physics-Light (NTSE Stage-1 (State-Level) Scholastic-Aptitude & Language Comprehension): Questions 20 - 26 of 31

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## Question number: 20

» Physics » Light

MCQ▾

### Question

A concave mirror of focal length (in air) is immersed in water Ki ). The focal length of the mirror in water will be

### Choices

Choice (4) Response

a.

b.

c.

d.

f

## Question number: 21

» Physics » Light

MCQ▾

### Question

If the tube length of astronomical telescope is 105 cm and magnifying power is 20 for normal setting, find the focal length of the objective.

### Choices

Choice (4) Response

a.

20 cm

b.

10 cm

c.

100 cm

d.

25 cm

## Question number: 22

» Physics » Light

MCQ▾

### Question

Which of the following is employed to clearly view objects, which cannot be seen directly due to obstruction?

### Choices

Choice (4) Response

a.

Laser

b.

Periscope

c.

Kaleidoscope

d.

All of the above

## Question number: 23

» Physics » Light

MCQ▾

### Question

Two lenses are placed in contact with each other and the focal length of the combination is 80 cm. If the focal length of one is 20 cm, then the power of the other will be

### Choices

Choice (4) Response

a.

-3.75D

b.

-1.0 D

c.

4.0 D

d.

1.66 D

## Question number: 24

» Physics » Light

MCQ▾

### Question

Our eye is most sensitive for which of the following wave length?

### Choices

Choice (4) Response

a.

6500 Å

b.

4500 Å

c.

Equally sensitive for all wave lengths of visible spectrum

d.

5500 Å

## Question number: 25

» Physics » Light

MCQ▾

### Question

How does a light normally travel?

### Choices

Choice (4) Response

a.

Always towards a dark area

b.

In a curved line

c.

In concentric circles

d.

In a straight line

## Question number: 26

» Physics » Light

MCQ▾

### Question

When a ray of light is going from one medium to another its

### Choices

Choice (4) Response

a.

Wavelength increases

b.

Wavelength remains same

c.

Frequency remains same

d.

Frequency increases

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