CAPF (AC) 2021 (Paper-1) (Question 101-125)

Total Questions: 25

11. Which one of the following is not a breakdown peroduct of glucose during respiration?

(a) Ethanol
(b) Lactic acid
(c) Water
(d) Methanol

Correct Answer: (d) Methanol

Solution:Cellular respiration, the process by which organisms combine oxygen with foodstuff molecules, diverting the chemical energy in these substances into life-sustaining activities and discarding, as waste products, carbon dioxide and water.

Methanol toxicity can occur via ingestion, dermal absorption, and inhalation.

12. Which one of the following is an example of endothermic reaction?

(a) CaO(s) + ₂O(l) → Ca(OH)₂(aq)
(b) CaCO₃(s) → CaO(s) + CO₂(g)
(c) C(s) + O₂(g) → CO₂(g)
(d) CH4(g) +2O₂(g) → CO₂(g) + 2H₂O(I)

Correct Answer: (b) CaCO₃(s) → CaO(s) + CO₂(g)

13. Packeta of potato chips are usually flushed with which one of the following gases to prevent rancidity?

(a) Carbon dioxide
(b) Hydrogen
(c) Nitrogen
(d) Oxygen

Correct Answer: (c) Nitrogen

Solution:Oil and fat containing food items are flushed with nitrogen because the food containing fats and oil become rancid after sometime because of oxidation and give smell having a bad taste. Presence of nitrogen helps food to save from rancidity.

14. According to early Indian philosophera, what are the basic elements described in Pancha Tattva?

(a) Earth, Fire, Sky, Gas and Water
(b) Air, Earth, Fire, Sky and Water
(c) Gas, Land, Fire, Sky and Water
(d) Air, Earth, Fire, Land and Water

Correct Answer: (b) Air, Earth, Fire, Sky and Water

Solution:Panch-tatva refers to five aspects of god as mentioned in The Geeta.

In sanskrit, panch means five & tatva means truth.

Panch - Tatva :-

(1) Earth as mind
(2) Water as mind
(3) Fire as intelligence
(4) Air as awareness
(5) Sky as consciousness

15. A milkman adds a small amount of baking soda to milk. This makes the pH of the milk.

(a) strongly alkaline
(b) weakly alkaline
(c) strongly acidic
(d) weakly acidic

Correct Answer: (b) weakly alkaline

Solution:

To prevent the spoilage of milk, the milkman adds a very small amount of baking soda to fresh milk. Baking soda is sodium bicarbonate. It is basic in nature. Addition of baking soda increases the pH of milk from 6. It becomes weakly alkaline.
As this milk is slightly more alkaline than other, therefore, acid produced to set into curd will be neutralized by baking soda added by milkman. Hence, this milk takes a longer time to set as curd.

16. Which one of the following metal oxides does not usually react with sodium hydroxide?

(a) Copper oxide
(b) Aluminium oxide
(c) Potassium oxide
(d) Calcium oxide

Correct Answer: (d) Calcium oxide

Solution:CaO is not expected to react with NaOH because NaOH is a base and it can only react with either an acidic oxide or an amphoteric oxide.

Among given options BeO is an amphoteric oxide while B₂O₃ and SiO₂ are acidic oxides. Thus, all of them react with NaOH to form salts.

CaO, on the other hand, is a basic oxide and hence it will not react with NaOH.

17. When calcium metal reacts with sulphuric acid, the reaction stops after a short while. Why?

(a) The reaction of calcium with sulphuric acid is not feasible at room temperature.
(b) Formed calcium sulphate is insoluble in water and covers the calcium metal, preventing it from reacting any further
(c) Formed calcium sulphate requires two molecules of water to crystallize as gypsum
(d) Formed calcium sulphate is unstable.

Correct Answer: (b) Formed calcium sulphate is insoluble in water and covers the calcium metal, preventing it from reacting any further

Solution:The reason is due to the surface area of calcium carbonate available to react.

When reacting a block of solid calcium carbonate with dilute sulphuric acid, solid calcium sulphate is produced which is deposited on the surface of the calcium carbonate block (since that is where the reaction occurs). The calcium sulphate is insoluble in dilute sulphuric acid and so you end up with calcium carbonate coated in a layer of calcium sulphate, which stops the acid from getting at the carbonate and so stops the reaction.
In contrast, calcium nitrate, produced from the reaction with nitric acid, is highly soluble in dilute nitric acid and so no solid layer forms around the carbonate block and the reaction can continue until one of the reagents is used up.

18. When a white light beam is made to fall on a hollow prism filled with water, it breaks into seven constituent colours. Which of the following colours suffers the maximum angle of deviation?

(a) Red
(b) Violet
(c) Green
(d) All suffer by equal amount of deviation

Correct Answer: (b) Violet

Solution:

The deviation is maximum for violet color and minimum for the red color of light.
According to the question, blue comes after the violet hence, it deviates the most.
An optical prism is a transparent optical substance with flat, polished surfaces thatrefract light.
The different colors that make up white light become separated.
This happens because each color has a particular wavelength and each wavelengthbends at a different angle.
When a ray of white light is passed through a prism gets split into its constituent colors. This phenomenon is called the dispersion of light.

19. Which one of the following is the correct time?

(a) 2:35
(b) 3:45
(c) 9:15
(d) 9:25

Correct Answer: (d) 9:25

Solution:If the time is between 1 to 11 o'clock then to find the mirror image, time is subtracted by 11: 60.

Given clock is showing 2:35.

Correct time is 11:60 - 2:35 = 9:25

20. Which one among the following is not a luminous object?

(a) Sun
(b) Proximn Centauri
(c) Jupiter
(d) Alpha Centauri

Correct Answer: (c) Jupiter

Solution:

Jupiter is not luminous because it does not produce its own light like Sun, Proxima centauri and Alpha centauri which are suns distant from our Sun.
Both a torch and a star are considered to be luminous objects. In order for us to see an object that is non-luminous, it must reflect some of the light it receives from a luminous source, such as the Sun.

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CAPF (AC) 2021 (Paper-1) (Question 101-125)

11. Which one of the following is not a breakdown peroduct of glucose during respiration?

12. Which one of the following is an example of endothermic reaction?

13. Packeta of potato chips are usually flushed with which one of the following gases to prevent rancidity?

14. According to early Indian philosophera, what are the basic elements described in Pancha Tattva?

15. A milkman adds a small amount of baking soda to milk. This makes the pH of the milk.

16. Which one of the following metal oxides does not usually react with sodium hydroxide?

17. When calcium metal reacts with sulphuric acid, the reaction stops after a short while. Why?

18. When a white light beam is made to fall on a hollow prism filled with water, it breaks into seven constituent colours. Which of the following colours suffers the maximum angle of deviation?

19. Which one of the following is the correct time?

20. Which one among the following is not a luminous object?

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