For a real image formed by a convex lens, the ratio of I : O = 2 : 5, then the object is :

(I is the height of the image and O is the height of the object)

1. between O and F
2. beyond 2F
3. at F
4. between F and 2F

A ray of light is incident normally on a face of an equilateral prism. The ray gets totally reflected at the second refracting surface. The total deviation produced in the path of the ray is:

1. 30°
2. 60°
3. 90°
4. 120°

A metal piece of mass 5 g has thermal capacity 2.5 J K⁻¹. If the mass of the metal is tripled, then its specific heat capacity will be :

1. 7.5 J K⁻¹
2. 2.5 J K⁻¹
3. 1.5 J g⁻¹ K⁻¹
4. 0.5 J g⁻¹ K⁻¹

Assertion (A) : As the level of water in a tall measuring cylinder kept under running tap rises, the pitch of sound gradually increases.

Reason (R) : Frequency of sound is inversely proportional to the length of the water column.

1. Both (A) and (R) are true and (R) is 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. (A) is false but (R) is true.