SOLVED PAPER 2022 (CDS) (I) (General Awareness)

Total Questions: 120

1. If the magnification produced by a lens is +2, then the image is

Correct Answer: (c) erect, virtual and larger than the object.
Solution:If the magnification produced by a lens is +2, then the image is erect, virtual and larger than the object. Positive magnification means the image is erect and virtual and negative magnification means image is inverted and real.

2. What is the correct sequence of resistivity of silver, nichrome and glass at room temperature?

Correct Answer: (a) Silver < nichrome < glass
Solution:At room temperature, silver is a good conductor of electricity while nichrome is a conducting alloy of nickel and chromium. But glass is an insulator.

Therefore, increasing order of their resistivity are, silver < nichrome < glass is the correct sequence.

3. At the time of short-circuit, the current in the circuit

Correct Answer: (c) increases heavily
Solution:At the time of short-circuit, live wire and neutral wire comes in contact with each other. Due to this, current increase heavily. Hence, option (c) is correct.

4. Which one of the following statements is not correct?

Correct Answer: (d) A wire with a green insulation is usually the live wire of an electric supply.
Solution:All the statements given are correct, except for the statement given in option (d). It can be correct as a wire with a green insulation is usually the earth wire of an electric supply.

Note: For single or 3-phase AC colour distribution is as follows.

Live wire-Red, Yellow or Blue

Neutral wire-Black

Earth wire-Green

5. A boy completes one round of a circular track of diameter 200 m in 30 s. What will be the displacement at the end of 3 min and 45 sec?

Correct Answer: (c) 200 m
Solution:

Given, diameter of track
(d) = 200m
Total time (T) = 3min + 45 sec
= 3 × 60 + 45
= 225 sec

Now boy will complete 7 rounds in
210 sec (7 × 30 sec). Thus in extra
15 sec he will cover distance which
can be considered as displacement.
In 15 sec he will complete half-round
of the circular track and the
displacement will be equal to its
diameter.

6. What happens to the gravitational force between two objects if the mass of one object is doubled and the distance between them is also doubled?

Correct Answer: (c) The force would be halved
Solution:According to the Newton's law of gravitational, the gravitational force between two bodies of masses (m₁, m₂) and distance (r) is given by

7. The number of moles of oxygen gas used in the complete combustion of 1 mole of glucose is

Correct Answer: (c) 6
Solution:

The reaction involve during the
combustion of glucose is as follows.

C₆H₁₂O₆(aq) + 6O₂(g) → 6CO₂(g) + 6H₂O(l)

Thus, 6 number of moles of oxygen
gas is used in the complete
combustion of 1 mole of glucose.

8. Which one of the following is not an example of an oxidation reaction?

Correct Answer: (b) A white substance is formed when an aqueous solution of barium chloride is mixed with sodium sulphate solution.
Solution:

9. Methanoic acid is normally found in

Correct Answer: (c) ant stings
Solution:Methanoic acid (also called formic acid) is normally found in ant stings. It is the simplest carboxylic acid with chemical formula HCOOH.

10. What is the number of moles of 'He' in 104 g of helium gas?

Correct Answer: (b) 26
Solution: