# Physics (NTSE Stage-1 (State-Level) Scholastic-Aptitude & Language Comprehension): Questions 48 - 52 of 136

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## Question number: 48

» 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: 49

» Physics » Motion and Force

MCQ▾

### Question

The u-t plot of a moving object is shown in the figure. The average velocity of the object during the first 10 is

### Choices

Choice (4) Response

a.

5 m/s

b.

2.5 m/s

c.

Zero

d.

2 m/s

## Question number: 50

» Physics » Light

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: 51

» 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: 52

» Physics » Work and Energy

MCQ▾

### Question

A glass jug is to be made that does not break when boiling water is poured onto it two possibilities are

I. Using thick glass.

II. Using thin glass.

III. Using glass that expands greatly when heated.

IV. Using glass that expands little when heated.

Which two choices would be best?

### Choices

Choice (4) Response

a.

II and IV

b.

I and IV

c.

I and III

d.

II and III

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