NDA/NA SOLVED PAPER 2016-I (GENERAL KNOWLEDGE)

Total Questions: 100

51. The temperature at which a solid melts to become a liquid at the atmospheric pressure is called its melting point. The melting point of a solid is an indication of

Correct Answer: (a) strength of the intermolecular forces of attraction
Solution:The melting point is an important physical property of a compound. The melting point can be used to identify a substance and as an indication of its purity. The melting point of solid is defined as the temperature at which the solid exists in equilibrium with its liquid under an external pressure of one atmosphere.haft Melting point also depends upon the intermolecular force of attraction between the molecule.

52. Consider the following circuit:

Correct Answer: (c)
Solution:1/R = 1/R₁ + 1/R₂ + 1/R₃
= 1/2 + 1/4 + 1/6
= 11/12
R = 12/11
Total resistance = 12/11 + 8
= 9 1/11 ohm.

53. Which one of the following elements will not react with dilute HCl to produce H₂?

Correct Answer: (a) Hg

54. Which of the following pairs of vector and disease is/are correctly matched?

 

VectorDisease
1. AnophelesMalaria
2. Aedes aegyptiChikungunya
3. Tsetse flyFilariasis
4. Bed bugsSleeping sickness

Select the correct answer using the code given below:

Correct Answer: (b) 1 and 2 only
Solution:Female Anopheles mosquito is the vector which spread malaria. Chikungunya virus is most often spread to people by Aedes aegypti and Aedes albopictus mosquitoes.

55. Consider the following statements:

1. All Echinoderms are not marine.
2. Sponges are exclusively marine.
3. Insects are found in all kinds of habitats.
4. Many primates are arboreal.

Which of the statements given above is/are correct?

Correct Answer: (b) 3 and 4 only
Solution:Insects are the most diverse group of animals and are found in all types of environment. Primates evolved from their ancestors by adapting to arboreal life. Primates are thought to have developed several of their traits and habits initially while living in trees.

56. Areas which are engines for economic growth supported by quality infrastructure and complemented by an attractive fiscal package are known as

Correct Answer: (c) Special Economic Zones

57. Deserts, fertile plains and moderately forested mountains are the characteristic features of which one of the following regions of India?

Correct Answer: (d) North-Western India
Solution:Deserts, fertile plains and moderately forested mountains are the characteristics features of North-Western India.

58. A racing car accelerates on a straight road from rest to a speed of 50 m/s in 25 s. Assuming uniform acceleration of the car throughout, the distance covered in this time will be

Correct Answer: (a) 625m
Solution:a = v/t = 50/25 = 2m/s²
S = Ut + 1/2 at²
= 0 + 1/2 × 2 × 25 × 25 = 625m

59. A man weighing 70 kg is coming down in a lift. If the cable of the lift breaks suddenly, the weight of the man would become

Correct Answer: (d) zero
Solution:If the cable of the lift breaks suddenly the weight of the man would become zero because the system would all begin to accelerate downward due to the force of gravity. All objects in the freefall accelerate downward with the same magnitude.

60. A given conductor carrying a current of 1 A produces an amount of heat equal to 2000 J. If the current through the conductor is doubled, the amount of heat produced will be

Correct Answer: (c) 8000 J
Solution:Heat produced by the wire, W = I²R
W₁ / W₂ = (I₁)²/ (I₂)²
2000 / W₂ = (1)²/ (2)²
W₂ = 2000X4/1
W₂ = 8000J