You want to register your name for an examination. For registration purposes, you need a passport-size photograph of yourself. When you went to a studio, the photographer told you to sit on a chair in front of a white screen in the room.

Assertion (A) : This is purposefully done so that you as an object should stand beyond the centre of curvature of the camera lens, but surely not at an infinite distance.

Reason(R) : The characteristics of the image formed are that it can be taken on a screen and is also diminished in size.

1. Both A and R are true, and R is the correct explanation of A.
2. Both A and R are true, and R is not the correct explanation of A.
3. A is true, but R is false.
4. Both A and R are false.

Rivers which originate from the glaciers at high altitudes have a supply of water throughout the year. This is because ice in high mountains does not melt all at once. This is due to:

1. high specific heat of ice.
2. low specific heat of ice.
3. low specific latent heat of fusion of ice.
4. high specific latent heat of fusion of ice.

What is the ratio of wavelengths between P, Q and R?

1. 3:2:1
2. 1:2:3
3. 6:3:2
4. 2:3:6

During the change of state of a substance from solid to liquid, heat is absorbed by a body, but its temperature does not rise. Which of the following statements explains the phenomenon?

1. Only K.E of the molecules increases, but P.E remains the same.
2. Only P.E of the molecules increases, but K.E remains the same.
3. Both K.E and P.E of the molecules increase.
4. There is no increase in the P.E and K.E of the molecules.