SOLVED PAPER 2023 (CDS) (I) (General Studies)

Total Questions: 120

51. Which one of the following is the correct order of pH for the given substances?

Correct Answer: (d) Lemon juice < Coffee < Blood < Milk of magnesia
Solution:The correct order of pH for the given substances is

Lemon juice < Coffee < Blood < Milk of magnesia

The pH range of Milk of Magnesia is 10-10.5. Milk of Magnesia is another name of Magnesium Hydroxide. It is used as an Antacid to neutralise excess acid present in the digestive system.

Normal pH range of human blood is 7.35 to 7.45. This means that blood is naturally slightly alkaline or basic. With an average pH of 4.85 to 5.10, most coffees are considered rather acidic.

Lemon juice has a pH between 2 and 3, which means it's 10,000-100,000 times more acidic than water (1, 2, 3).

52. Which one of the following is not true for anodising process?

Correct Answer: (d) It is used in aircraft industry.
Solution:Statement (c) is not true for anodising process.

During anodising, a clean aluminium article is made the anode and is electrolysed with dilute sulphuric acid. The oxygen gas evolved at the anode reacts with aluminium to make a thicker protective oxide layer. This oxide layer can be dyed easily to give aluminium articles an attractive finish.

53. Naphthalene burns with a yellow sooty flame. This is because

Correct Answer: (b) there is incomplete combustion.
Solution:Naphthalene burns with a yellow sooty flame. This is because there is incomplete combustion.

The yellow flame is caused by the glow of hot unburnt carbon particles produced due to the incomplete combustion of an unsaturated hydrocarbon.

54. Which of the following statements are true for the reaction of Fe₂O₃ with aluminium?

1. It is known as the 'thermite reaction.
2. The heat evolved is used for welding purpose.
3. Aluminium metal acts as an oxidizing agent.
4. Molten Fe and AL are formed at the end of the reaction.

Select the correct answer using the codes given below.

Correct Answer: (a) 1 and 2
Solution:Statements (1) and (2) are true for the reaction of Fe₂O₃ with aluminium.

The reaction taking place between Fe₂O₃ and Aluminium () is a thermite reaction. This is an exothermic reaction, which generates a great amount of heat and results in the formation of molten iron metal, which is used to join the rails.

Statements (3) and (4) are not true. Aluminium metal do not act as an oxidizing agent. Aluminium Oxide (Al₂O₂) is only a great reducing agent (will undergo Oxidation easily).

Iron(III) oxide (Fe₂O₃) reacts with aluminium(Al) to form aluminium oxide(Al₂O₂) and molten iron (Fe).

55. Vicky told his friends about his visit to Stewart Island, Bay of Plenty and Hawke Bay. Which country did Vicky visit?

Correct Answer: (c) New Zealand
Solution:Vicky Visited new Zealand Stewart Island. Boy of Plenty and Hawke Bay all are situated in New Zealand.

The Stewart Island is a heaven for brown kiwi or Tokoeka.

Bay of Plenty is known for its coastline and marine life.

Hawke Bay is known for full bodied red and complex chardonnays.

56. Manav is planning to visit all UNESCO World Heritage Sites. in Delhi. He will be visiting

Correct Answer: (c) Red Fort, Qutub Minar, Humayun
Solution:Manav will be visit these are three UNESCO World Heritage Sites in Delhi, the Red Fort, Qutub Minar and Humayun Tomb.

Being listed as a World Heritage Site can positively affect the site, its environment and interactions between them. A listed site gains international recognition and legal protection and can obtain funds from among others the Worlds Heritage Fund to facilate its conservation under certain conditions.

57. What will be the correct sequence of cities on the bank of river Ganga if someone moves from West to East?

Correct Answer: (d) Kanpur, Prayagraj, Patna, Bhagalpur
Solution:The river Ganga flows through well populated region of India. In Dev Prayag two heavenly rivers Alaknanda and Bhagirathi merges to form the holy Ganga. It is sacred river and it contains bacteriophages which do not allow bacterial growth. It mainly passes through Uttarkhand, Uttar Pradesh, Bihar, Jharkhand and West Bengal. Then it merges with Brahmaputra.

58. Which one among the following states has the longest extension in North-South direction?

Correct Answer: (d) Chhattisgarh
Solution:Chhattisgarh is a landlocked state in Central India. Its ninth largest state. It shares border with Uttar Pradesh, Madhya Pradesh, Maharashtra, Jharkhand, Odisha, Telangana and Andhra Pradesh. It was formed on 1st Nov, 2000 with Raipur its capital. It is one of the fastest growing state in India. It has third largest coal reserves 40% area covered with forests and a resource rich state.

59. Match List-I with List-II and select the correct answer using the codes given below the Lists.

List-I (Day)List-II (Date)
A. World Wetlands Day1. 29th July
B. International Tiger Day2. 22nd April
C. World Water Day3. 2nd February
D. International Mother Earth Day4. 22nd March

 

Code:ABCD
(a)3412
(b)3142
(c)2143
(d)2413
Correct Answer: (b)
Solution:The World Wetland Day celebrated on 2nd February and International Tiger Day celebrated on 29th July. It was celebrated to raise awareness about endangered tiger species.

World Water Day celebrated on 22 March and International Mother Earth day on 22 April each year. It was celebrated to remember that Earth is our home and we want to live in harmony with nature.

60. Which one of the following States/UTs is not among the top five in the Performance. Grading Index (PGI), published by the Ministry of Education for the year 2020-2021?

Correct Answer: (c) NCT of Delhi
Solution:The Performance Grading Index (PGI) is a comprehensive by Ministry of Education for evaluating the performance of the school education system education system at the State/UT level. It assesses the performance based on various indicators and creates an index for comprehensive analysis. The PGI scores are aggregate score of 6 domains of educational attainment of states. (i) Learning outcomes (ii) Access, (iii) Infrastructure, (iv) Equity (v) Governance processes (vi) Teacher education and Training.