CAPF (AC) 2023 (Paper-1) (Questions 51-100)

Total Questions: 50

1. The method used in separating a mixture of two miscible liquids having sufficient difference in their boiling points is:

(a) Filtration
(b) Solvent Extraction
(c) Centrifugation
(d) Simple Distillation

Correct Answer: (d) Simple Distillation

Solution:Distillation :- it is used for the separation of components of a mixture containing two miscible liquids that boil without decomposition and have sufficient difference in their boiling points. To separate a mixture of two or more miscible liquids for which the difference in boiling points is less than 25 K, fractional distillation process is used.

2. Which one of the following statements is correct?

(a) Alloys are mixtures.
(b) Alloys are compounds.
(c) Alloys are always made up of metals.
(d) All alloys contain carbon as one of their components.

Correct Answer: (a) Alloys are mixtures.

Solution:Alloys:- Alloys are mixtures of two or more metals or a metal and a non-metal and cannot be separated into their components by physical methods. But still, an alloy is considered as a mixture because it shows the properties of its constituents and can have variable composition. For example, brass is a mixture of approximately 30% zinc and 70% copper.

3. The common element in graphite, fullerene, diamond and graphene is:

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

Correct Answer: (d) Carbon

Solution:The element carbon occurs in different forms in nature with widely varying physical properties. Both diamond and graphite are formed by carbon atoms; the difference lies in the manner in which the carbon atoms are bonded to one another. In diamond, each carbon atom is bonded to four other carbon atoms forming a rigid three-dimensional structure.

In graphite, each carbon atom is bonded to three other carbon atoms in the same plane giving a hexagonal array. One of these bonds is a double-bond, and thus the valency of carbon is satisfied. Graphite structure is formed by the hexagonal arrays being placed in layers one above the other.

These two different structures result in diamond and graphite having very different physical properties even though their chemical properties are the same. Diamond is the hardest substance known while graphite is smooth and slippery. Graphite is also a very good conductor of electricity unlike other non-metals that you studied in the previous Chapter. Diamonds can be synthesised by subjecting pure carbon to very high pressure and temperature.

These synthetic diamonds are small but are otherwise indistinguishable from natural diamonds. Fullerenes form another class of carbon allotropes. The first one to be identified was C-60 which has carbon atoms arranged in the shape of a football. Since this looked like the geodesic dome designed by the US architect Buckminster Fuller, the molecule was named fullerene.

4. The gas generated on reacting zinc with dilute sulphuric acid is:

(a) Argon
(b) Helium
(c) Hydrogen
(d) Nitrogen

Correct Answer: (c) Hydrogen

Solution:When dilute sulfuric acid is poured on zinc granules, the acid is displaced by zinc, which is more reactive than hydrogen, resulting in zinc sulfate and hydrogen gas. It is a single displacement reaction of a non-metal by a metal.

5. An aqueous solution of a salt is known as brine. The salt is:

(a) Sodium chloride
(b) Potassium chloride
(c) Calcium chloride
(d) Sodium nitrate

Correct Answer: (a) Sodium chloride

Solution:An aqueous solution is a solution in which the solvent is water. It is mostly shown in chemical equations by appending (aq) to the relevant chemical formula. For example, a solution of table salt, or sodium chloride (NaCl), in water would be represented as Na⁺ (aq) + Cl⁻ (aq).

6. Which one of the following commissions was not associated with public service in India?

(a) Aitchison Commission
(b) Islington Commission
(c) Lee Commission
(d) Radhakrishnan Commission

Correct Answer: (d) Radhakrishnan Commission

Solution:Radha Krishna Commission was established to investigate the situation of Indian university education and make recommendations for improvements. Dr. Sarvepalli Radhakrishnan was named Chairman of the Commission on University Education. After India attained independence on August 15, 1947, the University Education Commission requested Dr. Radhakrishnan to serve as its chair.

7. Who among the following was known as 'Lokhitwadi'?

(a) Keshub Chandra Sen
(b) Gopal Hari Deshmukh
(c) M.G. Ranade
(d) Gopal Ganesh Agarkar

Correct Answer: (b) Gopal Hari Deshmukh

Solution:Gopal Hari Deshmukh composed articles on social change in Maharashtra in the weekly paper Prabhakar using the pen name 'Lokhitwadi'. Hence, he came to be known by that pen name. Gopal Hari Deshmukh was an Indian activist, thinker, social reformer and an important figure of the Social Reform Movement in Maharashtra.

8. Match List-I with List-II and select the correct answer using the code given below the Lists:

List-I (Harappan Site)	List-II (Location)
A. Nageshwar	1. Uttar Pradesh
B. Alamgirpur	2. Rajasthan
C. Kalibangan	3. Saurashtra
D. Rakhigarhi	4. Haryana

Codes:	A	B	C	D
(a)	3	1	2	4
(b)	4	2	1	3
(c)	4	1	2	3
(d)	3	2	1	4

Correct Answer: (a)

Solution:

Harappan site	Location
Nageshwar	Shaurashtra, Gujarat
Alimgirpur	Uttar Pradesh
Kalibangan	Rajasthan
Rakhigarhi	Haryana

9. Which one of the following pairs of books and their authors is not correctly matched?

(a) Bandi Jiwan: Sachindranath Sanyal
(b) The Philosophy of the Bomb: Bhagwati Charan Vohra
(c) Indian Unrest: Annie Besant
(d) Desher Katha: Sakharam Ganesh Deuskar

Correct Answer: (c) Indian Unrest: Annie Besant

Solution:Valentine Chirol has collected and republished his valuable series of articles in The Times upon Indian unrest is an important and very instructive contribution to the study of what is probably the most arduous problem in the politics of our far-reaching Empire.

10. Which of the following is/are important markers for the archaeologists to identify an archaeological site as a 'center of craft production'?

1. Evidence of raw materials such as stone nodules, whole shells, etc.

2. Geographical expanse of the site

3. Evidence of unfinished objects, rejects and waste material

4. Evidence of variety of pottery

Select the correct answer using the code given below:

(a) 1 only
(b) 1 and 3 only
(c) 2 and 4 only
(d) 3 only

Correct Answer: (b) 1 and 3 only

Solution:In order to identify centres of craft production, archaeologists usually look for the following: raw material such as stone nodules, whole shells, copper ore; tools; unfinished objects; rejects and waste material.

In fact, waste is one of the best indicators of craft work. For instance, if shell or stone is cut to make objects, then pieces of these materials will be discarded as waste at the place of production.

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