General Knowledge Part -B: English (NDA/NA SOLVED PAPER 2022-I) (51 to 100)

Total Questions: 50

1. What is the mass of a material, whose specific heat capacity is 400 J/(kg°C) for a rise in temperature from 15°C to 25°C, when heat received is 20 kJ?

Correct Answer: (d) 5 kg
Solution:

2. The specific latent heat of vaporization of a substance is the quantity of heat needed to change unit mass from

Correct Answer: (b) liquid to vapour without a change of temperature
Solution:Latent heat of veporization is the amount of heat required by a substance to change unit mass from liquid to vapour without a change of temperature.

3. Evaporation from the surface of a given liquid takes place more rapidly when

Correct Answer: (a) the temperature is high and the surface area of the liquid is large
Solution:Rate of evaporation
∝ surface area
∝ Temprature

4. Which of the following statements correctly explains/explain the existence of a positive force between two electric charges?

1. Both the charges are positive.
2. Both the charges are negative.
3. Both are charges are oppositely charged.
Select the correct answer using the code given below.

Correct Answer: (c) 1 and 2 only
Solution:Both the charges are either positive or negative.

5. An electric wire of resistance 50 ohm is cut into five equal wires. These wires are then connected in parallel. What is the equivalent resistance of this combination?

Correct Answer: (a) 2 ohm
Solution:

6. The electric field lines from an isolated positively charged conducting sphere are

Correct Answer: (d) at right angles to the conducting surface and outwards from the centre of the sphere
Solution:We can clearly sec from figure electric line of field is Ir to conducting surface and directed outward.

7. Which one of the following is not a solution?

Correct Answer: (d) Sugar
Solution:Sugar, on its own, is a pure substance, not a solution. However, when dissolved in water, it forms a solution. Thus, option (d) is correct.

8. Refining of petroleum is carried out using which one of the following techniques?

Correct Answer: (b) Fractional distillation
Solution:fractional distillation It is a process used for separating a mixture of two or more miscible liquid whose boiling point difference is very less. This method is employed in refining of petroleum.

9. Which one of the following is a chemical change?

Correct Answer: (d) Milk turning sour
Solution:Milk turning sour is an example of chemical change as there is a change in chemical composition of milk in which lactose sugar of milk changes to lactic acid.
Dissolution of sugar in water melting of ice and crystallization are the physical changes.

10. Which one of the following is the correct molecular formula of ammonium carbonate if the valency of ammonium ion is (+1) and carbonate anion is (-2)?

Correct Answer: (a) (NH₄)₂ CO₃
Solution: