CAPF (AC) 2012 (Paper-1) (Question 1-50)

Total Questions: 50

41. When an iron nail is dipped in a solution of copper sulphate, the iron nail becomes brownish in colour and the blue colour of copper sulphate solution fades after some time. The reaction is an example of chemical

Correct Answer: (c) displacement
Solution:

A displacement reaction is the one wherein the atom or a set of atoms is displaced by another atom in a molecule. For example when iron is added to a copper sulphate solution, it displaces the copper metal.

  • Combination Reaction — A reaction in which two or more substances combine to form a single substance is called a combination reaction. It is also called a synthesis reaction.
  • Decomposition Reaction — A reaction in which a compound breaks up on heating into two or more simpler substances is called a decomposition reaction.
  • Double Displacement Reaction — A chemical reaction in which two compounds in their agueous state exchange their ions or radicals to form new compounds is called a double decomposition reaction.

42. Bleaching powder is added in water used for drinking purpose. The role of bleaching powder in this case is

Correct Answer: (a) of disinfectant
Solution:

Bleaching powder is calcium oxychloride. The chemical formula of bleaching powder is CaOCl2. It is also called as the chloride of lime. It is used for disinfecting drinking water supply to make it potable. It makes drinking water free from germs.

43. If four balloons A, B, C and D are filled with hydrogen, oxygen, helium and nitrogen gases respectively and left in air, which balloon reaches to the highest distance from the Earth?

Correct Answer: (c) Balloon C
Solution:

The helium gas has the lowest density due to which it is lighter than other gases so the balloon (C)filled with helium goes highest in the sky. The balloon will stop ascending if the balloon reaches a height where density of air is nearly equal to the density of helium gas within the balloon.

44. Which one among the following is not a greenhouse gas?

Correct Answer: (d) Sulphur dioxide
Solution:

A greenhouse gas is a gas that absorbs and emits radiant energy within the thermal infrared range, causing the greenhouse effect. The greenhouse gases in Earth's atmosphere are water vapor (H₂O) , carbon dioxide (CO₂) , ethane (CH₄) nitrous oxide (N₂O) , and ozone (O₃) . Sulphur dioxide gas is not a greenhouse gas.
Greenhouse Effect

  • A greenhouse or a glasshouse is a closed glass structure in which plants are grown in regulated climatic conditions.
  • In such a structure, the solar radiation passes through the glass and is absorbed by the floor, earth, and other contents inside.
  • They, in turn, become warmer and reradiates the energy as infrared (heat) radiation which is of a longer wavelength.
  • This radiation cannot escape from the glass since glass cannot transmit infrared radiation. Thus, the temperature inside the greenhouse increases.
  • This is the Greenhouse Effect.

45. Which one among the following salts causes hardness to the water?

Correct Answer: (a) Calcium bicarbonate
Solution:

Calcium carbonate is insoluble in water so it does not cause hardness whereas calcium bicarbonate is readily soluble in water and causes the hardness of the water by dissolving Ca²⁺ ions in it.

46. Consider the following statements about Rig Veda :

1. It reflects a naturalistic polytheism-a belief in many Gods who personified natural phenomenon.

2. The Gods were conceived of as anthropomorphic, i.e., as having a physical form similar to that of humans.

Which of the statements given above is/are correct?

Correct Answer: (c) Both 1 and 2
Solution:

The ancient text-Rigveda reflect a naturalistic polytheism which was based on belief in many gods who personified natural phenomenon. The deities were associated with the natural phenomenon like Surya (Sun), Agni (Fire) etc.

The Gods were also conceived of as anthropomorphic, i.e. as having physical form similar to humans and there was mention of their bodily features. Various qualities and virtues of human being are attributed to them. Polytheism is the belief in multiple deities. They are usually assembled into a group of gods and goddesses.

47. The following two (2) items consist of two statements, Statement I and Statement II. You are to examine these two statements carefully and select the answers to these items using the code given below :

Statement I : In India, tribal movements of 19th century resulted out of the process of land displacements and the introduction of forest laws.

Statement II : The Indian freedom movement resolved the problems faced by the tribals.

Correct Answer: (c) Statement I is true but Statement II is false.
Solution:

In India, tribal movements of 19th century like Kol revolt, Santhal revolt, Munda rebellion resulted out of the process of land displacements and the introduction of forest laws. The main demand of tribals was the ownership or regains the traditional control of their land and their customs.

Second statement is incorrect as the Indian freedom movement not resolved the problems faced by the tribals as such.

48. Statement I : The economy of India in the 19th century came to a state of ruin under the English East India Company.

Statement II : The English East India Company's acquisition of Diwani right led to the miseries of the peasants and those associated with the traditional handicrafts industry of India.

Correct Answer: (b) Both the statements are individually true but Statement II is not the correct explanation of Statement I.
Solution:

Economy of India in the 19th century came to a state of ruin, under East India company. The policy of the Company was to flourish their trade and destroying the Indian textile industry. The English East India Company's acquisition of Diwani right led to the miseries of the peasants and those associated with the traditional handicrafts industry of India.

49. The famous terra-cotta images of rivers Ganga and Yamuna from the Gupta period have been found at

Correct Answer: (a) Ahichchhatra
Solution:

Two life-sized terracotta images of Rivers Ganga and Yamuna belonging to the Gupta period have been found at Ahichhatra. These images were originally installed in niches flanking the main steps leading to the upper terrace of the Shiva temple at Ahichhatra an dated back to 4th century A.D.
About Gupta Empire

  • The Gupta Empire was an ancient Indian empire founded by Sri Gupta. It stretched across northern, central, and southern parts of India between 320 and 550 CE.
  • The Gupta Empire is called the Golden Age of India due to its achievements in the arts, architecture, sciences, religion, and philosophy.
  • During this Gupta Empire, India witnessed a renaissance in cultural and intellectual pursuits, with significant contributions from figures like Kalidasa in literature and Aryabhata in science.
  • The Gupta rulers fostered an environment of stability and prosperity, facilitating advancements in various fields and leaving a lasting legacy on Indian civilization.

50. Consider the following statement :

"India would be far more reliable as a base for operations. Moreover the prospect of a settlement will be greatly enhanced by the disappearance of Gandhi, who had for years torpedoed every attempt at a settlement."

The above statement was made by the British in the context of

Correct Answer: (c) Quit India Movement
Solution:

This statement was made by British in context of Quit India Movement. The movement was started on 8 August 1942 demanding an end to British rule in India. Britishers at that time were expecting that Gandhi was going to die soon based on his failing health.

The Quit India Movement, launched on August 8, 1942, under Mahatma Gandhi's leadership, was a significant anti-colonial struggle. Gandhi's slogan, "Do or Die," marked a decisive call for ending British rule.

Initially a civil disobedience movement, it soon turned violent, aiming to dismantle the colonial regime. Acknowledging the nation's mood, Gandhi deemed resistance against state oppression morally justified, even if it led to riots.