Part – B (General Studies) NDA/NA SOLVED PAPER 2018 (II) (51 to 100)

Total Questions: 50

21. The full form of LED is:

Correct Answer: (a) Light Emitting Diode
Solution:

The full form of LED is Light Emitting Diode. It is a heavily doped p  − n junction diode which converts electrical energy into light energy

22. If a free electron moves through a potential difference of 1 kV, then the energy gained by the electron is given by:

Correct Answer: (b) 1.6 × 10⁻¹⁶ J
Solution:

Given, Potential difference,
  V = 1 kV = 1 × 10³ V
We know that,
Energy gained by electron = e · V
  = 1.6 × 10⁻¹⁹ × 10³ = 1.6 × 10⁻¹⁶ J

23. Consider the following places of India:

1. Itanaga
2. Imphal
3. Agartala
4. Aizaw
Which one of the following is the correct chronological order of the above places in terms of sunrise time?

Correct Answer: (b) 2 - 1 - 4 - 3
Solution:

The correct sequence in order of Sunrise timing in the following places are as: At Imphal, the capital city of Manipur, the sunrise time is 4:59 AM. At Itanagar, the capital city of Arunachal Pradesh, the sunrise time is 5:00 AM.
At Aizawal, the capital city of Mizoram, the sunrise time is 5:05 AM. At Agartala, the capital city of Tripura, the sunrise time is 5:10 AM.

24. Which one of the following is known as uplands of delta region?

Correct Answer: (d) Chars
Solution:

The Deltaic plain is the extension of the Khadar land. It covers large area in the lower reaches of the Ganga River. In the delta region, the upland is called Chars, while the marshy area is known as Bils.

25. Consider the following Wildlife Sanctuaries of India :

1. Shikari Devi
2. Bhadra
3. Simlipal
4. Pachmarhi
Which one of the following is the correct order of the above Wildlife Sanctuaries in terms of their location from South to North?

Correct Answer: (c) 2-3-4-1
Solution:

The correct order of the given wildlife sanctuaries in terms of their location from South to North is Bhadra Wildlife Sanctuary is located at Chikkamagaluru town in Karnataka.
It was established in the year 1951. It is a protected area and a tiger reserve as part of Project Tiger. Simlipal Wildlife Sanctuary, also known as Mayurbhanj Elephant Reserve, is a national park and a tiger reserve.
It was established in the year 1980. It is located in the Mayurbhanj district of Odisha. Pachmarhi Wildlife Sanctuary is also a biosphere reserve in the Satpura Range of Madhya Pradesh.
It was established in the year 1999. Shikari Devi Wildlife Sanctuary is located near the Shikari Devi Temple in Mandi district of Himachal Pradesh. It was established in the year 1974.

26. Which one of the following statements about temperature is correct?

Correct Answer: (d) Temperature decreases with height in the troposphere at an average rate of 6.4°C per km.
Solution:

The temperature of the troposphere is highest near the surface of the Earth and decreases with height or altitude. On average, the temperature gradient of the troposphere declines by 6.5°C per kilometre on going above.
However, in the stratosphere, temperature increases with altitude. The reason is that the direct heat source for the stratosphere is the Sun.

27. Which one of the following is known as a zone of sharp salinity change in the vertical section of ocean?

Correct Answer: (b) Halocline
Solution:

A halocline is a strong, vertical salinity gradient within a body of water. It is known as the zone of sharp salinity change in the vertical section of ocean. As salinity (in concert with temperature) affects the density of seawater, it can play an important role in its vertical stratification.

28. Permanent hardness of water cannot be removed by which one of the following methods?

Correct Answer: (c) Boiling
Solution:

Permanent hardness of water is due to the presence of chlorides and sulphates of calcium and magnesium ions. These compounds do not decompose on heating.
These are removed by ion exchange resin treatment or by Calgon’s method or by using a water softner like washing soda, calcium hydroxide, etc.

29. Which one of the following reactions will give NO (Nitric Oxide) gas as one of the products?

Correct Answer: (a) 3Cu + 8HNO₃ (dilute) →
Solution:

30. Which one of the following is a tribasic acid?

Correct Answer: (d) Phosphoric acid
Solution:

H₃PO₄, Phosphoric acid can be written as O = P(OH)₃. It has three acidic hydrogens (attached to oxygen) and is therefore tribasic acid.
On the other hand hydrochloric acid, nitric acid are monobasic while sulphuric acid is dibasic