# NEET Physics: Questions 1157 - 1159 of 2142

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## Question number: 1157

MCQ▾

### Question

A bimetallic strip is formed out of two identical strips, one of copper and other of brass. The coefficients of linear expansion of the two metals are a c and a b. On heating, the temperature of the strip goes up by ∆T and the strip bends to form an arc of radius of curvature R. Then R is

(1) Inversely proportional to ∆T

(2) Proportional to

(3) Inversely proportional to

(4) Proportional to

Select the correct answers and mark it according to the following codes:

### Choices

Choice (4) Response

a.

1 and 2 are correct

b.

1, 2 and 3 are correct

c.

2 and 4 are correct

d.

1 and 3 are correct

## Question number: 1158

MCQ▾

### Question

Which statements are incorrect for a zone plate and a lens?

(1) Zone plate has one focus whereas lens has multiple focal lengths

(2) Both zone plate and lens have multi focal lengths

(3) Zone plate has one focus whereas a lens has infinite

(4) Zone plate has multi focal lengths whereas lens has one

Select the correct answers and mark it according to the following codes:

Codes:

### Choices

Choice (4) Response

a.

1, 2 and 3 are correct

b.

1 and 3 are correct

c.

2 and 4 are correct

d.

1 and 2 are correct

## Question number: 1159

MCQ▾

### Question

The lengths and radii of two wires of same material are respectively L, 3L, and 3R, R. Equal weights are applied on then. If the elongations produced in them are l 1 and l 2 respectively then their ratio will be

### Choices

Choice (4) Response

a.

1: 18

b.

8: 1

c.

2: 1

d.

1: 8

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