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

Total Questions: 50

31. Which one of the following statements is not correct?

Correct Answer: (d) Graphite layers are held together by carbon-carbon single bond.
Solution:

Graphite layers are held together by van der Waals forces and not by carbon-carbon single bond.

32. Which one of the following is called Dry Ice?

Correct Answer: (a) Solid carbon dioxide
Solution:

Solid carbon dioxide is called Dry Ice or Cardice. It is used as a refrigerant for ice-cream and frozen food.

33. The acidic, semidigested food coming out of the stomach is neutralised by:

Correct Answer: (d) bile juice
Solution:

The acidic, semidigested food coming out of the stomach is neutralised by sodium bicarbonate present in the bile juice secreted by liver. Here it makes the medium of food alkaline.

34. The oxygenated blood from the lungs is received by the:

Correct Answer: (a) left auricle
Solution:

The oxygenated blood from the lungs is received by left auricle through pulmonary vein from here it goes to left ventricle and then it is pumped into other body parts.

35. The oxygen evovled during photosynthesis comes from splitting of:

Correct Answer: (a) water
Solution:

Photosynthesis is the process that plants undergo in order to transform solar energy into chemical energy which is stored in the bonds of sugar molecules. During the process, released oxygen comes from the splitting of water in the presence of light-dependent reaction.
The products of the light-dependent reactions are ATP and NADPH oxygen production is simply a byproduct of the splitting of water by sunlight).
The overall process of photosynthesis is typically represented by the following equation
6 CO₂ + 6 H₂O + sunlight → C₆H₁₂O₆ +6O₂

36. Which one of the following depicts the correct circuit of a reflex arc?

Correct Answer: (b) Receptor→sensory neuron→spinal cord→neuron→effector
Solution:

The correct reflex arch is depicted by option (b). It is receptor → sensory neuron → spinal cord → neuron→ effector.

37. If one set of chromosomes for a given plant is represented as N; in case of double fertilisation, the zygote and the endosperm nucleus of a diploid plant would have how many sets of chromosomes respectively?

Correct Answer: (d) 2N and 3N
Solution:

The zygote will have 2N chromosomes while endosperm nucleus will have 3N set of chromosomes after double fertilisation in plant.

38. Consider the following circuit :

Correct Answer: (b)
Solution:

39. The absolute zero temperature is 0 Kelvin. In °C unit, which one of the following is the absolute zero temperature?

Correct Answer: (c) − 273.15° C
Solution:

40. Consider the following statements about visible light, UV light and X-rays:

1. The wavelength of visible light is more than that of X-rays.
2. The energy of X-ray photons is higher than that of UV light photons.
3. The energy of UV light photons is less than that of visible light photons. Which of the statement(s) given above is/are correct?

Correct Answer: (b) 1 and 2
Solution:

(1) The frequency of X-ray is greater than visible light. So, the wavelength of visible light is more than that of X-rays.
(2) We know that, E = hν
Energy (E) ∝ ν (frequency)
X-ray have higher frequency so it has higher energy than that of UV light photons.