# KVPY (Kishore Vaigyanik Protsahan Yojana) Stream-SA (Class 11) Physics: Questions 62 - 64 of 253

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## Question number: 62

Appeared in Year: 2012

MCQ▾

### Question

A circular metallic ring of radius R has a small gap of width d. The coefficient of thermal expansion of the metal is α in appropriate units. If we increase the temperature of the ring by an amount ΔT, then width of the gap:

### Choices

Choice (4) Response

a.

will decrease by an amount dαΔT

b.

will not change

c.

will increase by an amount (2πR – d) αΔT

d.

will increase by an amount dαΔT

## Question number: 63

Appeared in Year: 2012

MCQ▾

### Question

In the figure below, PQRS denotes the path followed by a ray of light as it travels three media in succession. The absolute refractive indices of the media are μ1, μ2 and μ3 respectively. (The line segment RS’ in the figure is parallel to PQ). Then:

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 64

Appeared in Year: 2012

MCQ▾

### Question

A convex lens of focal length 15 cm is placed in front of a plane mirror at a distance 25 cm from the mirror. Where on the optical axis and from the centre of the lens should a small object be placed such that the final image coincides with the object?

### Choices

Choice (4) Response

a.

15 cm and on the opposite side of the mirror

b.

15 cm and between the mirror and the lens

c.

7.5 cm and between the mirror and the lens

d.

7.5 cm and on the opposite side of the mirror

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