# KVPY (Kishore Vaigyanik Protsahan Yojana) Stream-SA (Class 11) Physics: Questions 23 - 26 of 253

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## Question number: 23

Appeared in Year: 2011

MCQ▾

### Question

A cylindrical copper rod has length L and resistance R. If it is melted and formed into another rod of length 2L, than the resistance will be

### Choices

Choice (4) Response

a.

8R

b.

R

c.

4R

d.

2R

## Question number: 24

Appeared in Year: 2010

MCQ▾

### Question

White light is split into a spectrum by a prism and it is seen on a screen. If we put another identical inverted prism behind it in contact, what will be seen on the screen?

### Choices

Choice (4) Response

a.

There will be no spectrum, but only the original light with no deviation

b.

The spectrum will remain the same

c.

There will be no spectrum, but the original light will be largely displaced

d.

Violet will appear where red was

## Question number: 25

Appeared in Year: 2011

MCQ▾

### Question

The number of air molecules in a (5m × 5m × 4m) room at standard temperature and pressure is of the order of

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 26

Appeared in Year: 2010

MCQ▾

### Question

Two identical blocks of metal are at 20ºC and 80ºC respectively. The specific heat of the material of the two blocks increases with temperature. Which of the following is true about the final temperature T f when the two blocks are brought into contact? (Assuming that no heat is lost to the surroundings)

### Choices

Choice (4) Response

a.

T f will be more than 50ºC

b.

T f will be less than 50ºC

c.

T f will be 50ºC

d.

T f can be either more than or less than 50ºC depending on the precise variation of the specific heat with temperature

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