The major component used in the preparation of different types of glasses is

• Silica

• Sodium borate

• Calcium silicate

• Sodium silicate

All the elements in a group (family) have a common valency. For example, all the elements of the carbon family (carbon, silicon, germanium, tin, and lead) have common valency four. However, some of these elements can also have valency two. Which of the following can have valency two?

• Silicon, germanium and tin

• Only germanium and tin

• Germanium, tin and lead

• Only tin and lead

Match List-I with List-II

List I (Metallic oxide)

1. Uranium oxide
2. Cuprous oxide
3. Cobalt oxide
4. Chromium oxide

List II: (Colour imparted to glass)

1. Red
2. Blue
3. Green
4. Yellow

• (a) - 4, (b) - 1, (c) - 2, (d) - 3

• (a) - 3, (b) - 2, (c) - 1, (d) - 4

• (a) - 4, (b) - 2, (c) - 1, (d) - 3

• (a) - 3, (b) - 1, (c) - 2, (d) - 4

The image formed by a convex mirror of a real object is larger than the object (u = object distance, f = focal length)

• when u < 2f

• when u>2f

• for all values of u

• for no value of u

Protons and neutrons are bound in a nucleus by the

• short-range 'weak interaction'

• short-range 'strong interaction'

• long-range 'electromagnetic interaction'

• long-range 'gravitational interaction'

Refractive index of an optical medium changes with

1. the nature of the medium.
2. the change in the angle of incidence of the ray.
3. colour of the incident ray.

Select the correct answer using the code given below:

• 1 and 3 only

• 2 and 3 only

• 1 and 2 only

• 1,2 and 3

A one-rupee coin is placed at the bottom of a vessel. Water is then poured into the vessel such that the depth of water becomes 20 cm. If water has refractive index 4/3, the coin would be seen at a depth of

• 20 cm

• about 26 cm

• 15 cm

• 25 cm

The momentum of a body is

1. a vector quantity.
2. a conserved quantity in an isolated system.
3. same as a force in linear motion.

Select the correct answer using the code given below:

• 1 and 3 only

• 2 and 3 only

• 1 and 2 only

• 1, 2 only

Which one among the following is a correct sequence of the Indian ports from north to south?

• Haldia - Kandla - Paradeep - Kochi

• Kandla - Haldia - Paradeep - Kochi

• Kandla - Haldia - Kochi - Paradeep

• Kochi - Kandla - Haldia - Paradeep

40.

Which one among the following is a correct sequence of production of coal in the Indian States in descending order?

• Jharkhand - Madhya Pradesh - West Bengal - Meghalaya

• West Bengal - Madhya Pradesh - Jharkhand - Meghalaya

• Jharkhand - West Bengal - Meghalaya - Madhya Pradesh

• Madhya Pradesh - Jharkhand - West Bengal - Meghalaya