Part – B General knowledge (English) (NDA/NA SOLVED PAPER 2019 (I) (51 to 100)

Total Questions: 50

31. Basic scientific principle behind a nuclear reactor is:

Correct Answer: (d) controlled nuclear fission
Solution:

Basic scientific principle behind a nuclear reactor is controlled nuclear fission, in which a heavy atomic nucleus splits into two smaller nuclei and a large amount of energy is released in this process.

32. Which one of the following statements is not correct for the given reaction?

Correct Answer: (c) Copper is a more reactive metal than iron
Solution:

33. Which one of the following is an organic acid?

Correct Answer: (c) Acetic acid
Solution:

An organic acid is an organic compound with acidic properties. The most common organic acids are the carboxylic acids. Among the given options, acetic acid (CH₃COOH) is an organic acid. The remaining options contains inorganic acids.

34. Dinitrogen (N₂) and dioxygen (O₂) are the main constituents of air, but they do not react with each other to form oxides of nitrogen because:

Correct Answer: (c) the reaction is endothermic and requires very high temperature
Solution:

35. Who among the following has explained the phenomenon of photoelectric effect?

Correct Answer: (b) Albert Einstein
Solution:

The experiment of photoelectric effect is performed by Heinrich Hertz, but the phenomenon was explained by Albert Einstein. It is the phenomenon of ejection of electrons from the structure of a metal when light of suitable frequency strikes it.

36. The equivalent weight of oxalic acid in C₂H₂O₄ . 2H₂O is:

Correct Answer: (b) 63
Solution:

37. Which one of the following is not a west flowing river?

Correct Answer: (d) Tamraparni
Solution:

Tamraparni is not a West flowing river while others are west flowing rivers. Tamraparni river originates from Pothigai hills of Western Ghats (Tamil Nadu).
It flows through Tamil Nadu and falls into Gulf of Mannar. It has been historically Known as ‘Podhigai’. It is mentioned in the ancient Sangam and Tamil texts.

38. Which one of the following rivers was earlier known as ‘Vitasta’?

Correct Answer: (b) Jhelum
Solution:

'Jhelum river’ was earlier known as ‘Vitasta’, while Tista was known as ‘Trisrota’, Tungabhadra as ‘Pampa’ and Bharathapuzha as ‘Pratichi’.
Jhelum river rises from northern slopes of Pir Panjal ranges at Verinag Spring. It flows through Srinagar and Wular lake before entering Pakistan. It is a tributary of the Indus river.

39. River Sharda drains in the Northern Plains of Uttar Pradesh. Before entering in the Plains, Sharda is known as:

Correct Answer: (c) Kali
Solution:

The Sharda river originates from the greater Himalayas at Kalapaani in the Pithoragarh district of Uttarakhand. The river is named after the Goddess Kali whose temple is situated in Kalapaani. It drains the Northern plains of Uttar Pradesh and Uttarakhand.
It is known as ‘River Sharda’, when it reaches the plains of Uttarakhand and Uttar Pradesh. It forms India’s continous border between India and Nepal.

40. ‘Mission Indradhanush’ is related to:

Correct Answer: (d) Full immunisation
Solution:

‘Mission Indradhanush’ is related to full immunisation. This health mission was launched by the Ministry of Health and Family Welfare on 25th December, 2014.
The scheme seeks to drive towards 90% full immunisation coverage of India and sustain same by year 2020. Vaccination is being provided against eight vaccine preventable diseases, i.e.
Diphtheria, Pertussis, Tetanus, Polio, Measles, Tuberculosis, Hepatitis B, Meningitis, Rotavirus, Diarrhea and Japanese Encephalitis.