General Knowledge (Part – B : English) Antonyms (NDA/NA SOLVED PAPER 2022-II) (101 to 150)

Total Questions: 50

1. The presence of magnetic field can be determined using which one of the following instruments?

Correct Answer: (c) Magnetic needle
Solution:(c)

2. Which one of the following statements about speed and velocity is correct?

Correct Answer: (d) Speed is scalar quantity and velocity is vector quantity.
Solution:Speed is the distance covered by a body in unit time, without considering any direction hence it is Scalar. Velocity is defined as the rate and direction of an object's movement or simply it is speed with direction and hence Vector.

3. Bronze is an alloy of

Correct Answer: (b) Cu and Sn
Solution:Bronze is an alloy tcomposed of copper (Cu) and tin (Sn). Generrally it contains typically 88 percent copper and about 12 percent tin.

4. Which one of the following salts does not possess water of crystallization?

Correct Answer: (a) Potassium permanganate
Solution:Blue Vitriol are bright blue crystals containing five molecules of water (CuSO₄ . 5H₂O) Mohr's salt also referred to as ammonium iron (II) sulphate with chemical formula is (NH₄)₂Fe(SO₄)₂(H2O)₆.
Washing soda is better known as sodium carbonate decahydrate with chemical formula Na₂CO₃.10H₂O. Potassium permanganate does not contain the water of crystallization as it is an inorganic compound with the chemical formula KMnO₄.

5. Bee sting leaves an acid which causes pain and irritation. The acid released is

Correct Answer: (d) methanoic acid
Solution:Methanoic acid also known as formic acid, is released with bee stings and responsible for pain and irritation at the affected area. The formula of methanoic acid is HCOOH.

6. Liquid vegetable oils are converted to solid margarine by the use of

Correct Answer: (a) hydrogen gas
Solution:Most of the margarine is made from hydrogenated oils or partial hydrogenation of vegetable oils. Fat hydrogenation is process of combining vegetable oils with hydrogen, in order to make it more saturated to produce solid or semi-solid fats, such as margarine.

7. The number of structural isomers of pentane is

Correct Answer: (d) 3
Solution:There are three structural isomers for Pentane. These Structural isomers are n-pentane, Isopentane and Neopentane.
Structural isomers are molecules with the same chemical formula but different atomic arrangements and bonding patterns.

8. Vapours of sulphur escaping from a volcano often form a crust on the rocks. The process involved is an example of

Correct Answer: (c) deposition
Solution:Different forms of sulphur like sulphur dioxide and other gases are escaped from the volcanoes and forms a crust on the rocks involving the process of 12 deposition.

9. Dry ice is used on a performing stage to produce mist in air. The process involved is an example of

Correct Answer: (a) sublimation
Solution:A block of dry ice has a surface temperature of -78.5 degrees. It contains a block of solid carbon dioxide. Mist is formed by Solid CO₂, once it gets temperature above this temperature as solid carbon dioxide bypasses the liquid state and goes directly into a gas in a process called sublimation.

10. C₄H₈ belongs to the homologous series of

Correct Answer: (b) alkenes
Solution:C₄H₈ is Isobutylene. It belongs to homologous series of alkene. Alkenes are defined as either branched or unbranched hydrocarbons that possess at least one carbon-carbon double bond (C=C) and have a general formula of CₙH₂n.