# Physics-Light (NTSE Stage-1 (State-Level) Scholastic-Aptitude & Language Comprehension): Questions 14 - 19 of 31

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## Question number: 14

» Physics » Light

MCQ▾

### Question

On burning an element in air, forms an oxide. On dissolving this oxide in it forms an oxyacid. This oxide is a very good dehydrating agent and on reacting with caustic soda, it forms salt but no salt-formation takes place with . The oxyacid of the element is

### Choices

Choice (4) Response

a.

boric acid

b.

hypo phosphorus acid

c.

phosphoric acid

d.

phosphorus acid

## Question number: 15

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MCQ▾

### Question

A person standing in front of a mirror finds his image thinner but with normal height. The mirror is

### Choices

Choice (4) Response

a.

concave and spherical

b.

convex and spherical

c.

convex and cylindrical with horizontal axis

d.

convex and cylindrical with vertical axis

## Question number: 16

» Physics » Light

MCQ▾

### Question

To get three images of a single object, one should have two plane mirrors at an angle of

### Choices

Choice (4) Response

a.

30°

b.

60°

c.

90°

d.

150°

## Question number: 17

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MCQ▾

### Question

The number of lenses in a terrestrial telescope is

### Choices

Choice (4) Response

a.

six

b.

four

c.

two

d.

three

## Question number: 18

» Physics » Light

MCQ▾

### Question

An object is placed 40 cm from a concave mirror of focal length 20 cm. The image formed is

### Choices

Choice (4) Response

a.

virtual, erect and smaller in size

b.

real, inverted and smaller in size

c.

virtual, erect and larger in size

d.

real, inverted and same in size

## Question number: 19

» Physics » Light

MCQ▾

### Question

Critical angle of light passing from glass to water is minimum for

### Choices

Choice (4) Response

a.

green colour

b.

Yellow colour

c.

violet colour

d.

red colour

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