SOLVED PAPER 2022 (CDS) (II) (General Studies)

Total Questions: 120

71. Stinging hair of nettle leaves inject fluid in the human body causing burning pain. The fluid is

Correct Answer: (a) methanoic acid
Solution:The fluid present in the stinging hair of nettle leaves is methanoic acid. It is also known as formic acid. But as the stinging nettle also contain histamine and other chemicals, histamine causes the initial reaction when you are stung.

Methanoic acid is the simplest carboxylic acid and appears as a colorless liquid with a pungent odor.

72. Milk of Magnesia is used when people suffer from indigestion of food. It is a

Correct Answer: (b) mild base
Solution:Milk of magnesia is a mild base. It reduces stomach acid and increases water in the intestine. It is used as an antacid to relieve indigestion, sour stomach and heartburn. Therefore, it relieve people suffering from indigestion of food.

73. Which one of the following pairs of metals are very good conductors of heat?

Correct Answer: (a) Silver and Copper
Solution:Among the given pairs of metals, silver and copper are very good conductors of heat. Both metals have high thermal conductivity. Also they have free electrons which results in the higher conductivity.

74. School bells are made of metals because metals are

Correct Answer: (b) sonorous
Solution:School bells are made up of metals because metals are sonorous in nature i.e. they have the capability to produce sound when hit with a solid object. Due to this, students will able to hear the loud sound of bell from a long distance.

75. Consider the following statements about Tincture of Iodine.

1. It is an antiseptic solution.
2. Iodine is kept in alcohol-water mixture.
3. Concentration of iodine is very low.

How many of the above statements is/are correct?

Correct Answer: (c) 3
Solution:Tincture of lodine is usually 2 to 7% elemental iodine along with potassium iodide or sodium iodide, dissolved in the mixture of ethanol and water. It is basically used as an antiseptic having very low concentration of lodine.

Therefore, the number of statements correct are 3.

76. C l⁻ is not isoelectronic with

Correct Answer: (b) Mg²⁺
Solution:
lonsNumber of Electrons
Cl⁻18
K⁺18
Mg²⁺10
S²⁻18
p³⁻18

Species having same number of electrons are referred as isoelectronic species. Among the given ions C l⁻ is isoelectronic with all except Mg²⁺

77. In plant cells

Correct Answer: (b) Nucleus and chloroplasts are surrounded separately by. their own membrane
Solution:in plant cell, both nucleus and chloroplasts are surrounded separately by their own membranes. The nucleus is surrounded by nuclear envelope which consist of two parallel membranes which form a barrier between the genetic material present inside the nucleus and that of cytoplasm.

Similarly, the chloroplasts are also have double membrane bound.

78. Which one of the following statements about starch and glycogen is correct?

Correct Answer: (c) Starch is present in plant cells and glycogen is present in animal cells.
Solution:Starch is present in plant cells and glycogen is present in animal cells. Starch is synthesized during the process of photosynthesis and stored as reserve food material in plant, where as glycogen is the reserve food material in animals.

79. Which one of the following statements about the process of photosynthesis is correct?

Correct Answer: (d) Chlorophyll absorbs light energy which causes splitting of water molecules and reduction of carbon dioxide.
Solution:Chlorophyll absorbs light energy which causes splitting of water molecules and reduction of carbon dioxide.

There are two phases of photosynthesis i.e. light-dependent phase and light-independent phase. The light dependent phase takes place in the thylakoids which contains chlorophyll. Thus chlorophyll on exposure to sunlight, gets activated by absorbing photons. This absorbed energy is then used for splitting of water (H2O) into two component. Thus, the statement in option (d) is correct.

80. Kwashiorkor, a form of malnutrition, is caused by the deficiency of

Correct Answer: (d) Proteins
Solution:Kwashiorkor, a form of malnutrition is caused by the deficiency of protein.

Kwashiorkor is a protein-energy malnutrition (PEM). It is usually seen in children of age group 1 to 3 years. The children suffering from this show symptoms of oedema, silky thin hair, the colour of their hair changes into copper red.