NDA/NA SOLVED PAPER 2015-I (GENERAL KNOWLEDGE)

Total Questions: 100

61. Match List I with List II and select the correct answer using the code given below the Lists:

List-I (Island)List-II (Location)
A. Continental island1. Mauritius
B. Coral island2. Madagascar
C. Volcanic island3. Andaman and Nicobar islands
D. Mountain island4. Maldives
Code:ABCD
(a)2413
(b)2143
(c)3142
(d)3412
Correct Answer: (a)
Solution:Maldives consists of 1,192 coral islands. The island of Mauritius is relatively young geologically, having been created by volcanic activity some 8 million years ago. Madagascar is a special type of continental island is the microcontinental island, which results when a continent is rifted.

62. Consider the following diagram:


In which one among the following lettered area of the diagram would erosion most likely change the shapes of the riverbad?

Correct Answer: (b) B

63. Match List I with List II and select the correct answer using the code given below the Lists:

List-I (Cloud)List-II (Characteristic)
A. Cirrus1. Rain giving
B. Stratus2. Feathery appearance
C. Nimbus3. Vertically growing
D. Cumulus4. Horizontally spreading
Code:ABCD
(a)3142
(b)3412
(c)2413
(d)2143
Correct Answer: (c)
Solution:Cirrus is a genus of atmospheric cloud generally characterized by thin, wispy strands. Stratus clouds are a genus of low-level cloud characterized by horizontal layering with a uniform base, as opposed to convective or cumuliform clouds that are formed by rising thermals. nimbus indicates a precipitating cloud. Cumulus clouds, being low-stage clouds, are generally less than 1,000 m (3,300 ft) in altitude unless they are the more vertical cumulus congestus form. Cumulus clouds may appear by themselves, in lines, or in clusters.

64. The concept of demographic transition provides a model for

Correct Answer: (d) examining the relationship between economic development and natural population change
Solution:Demographic transition (DT) refers to the transition from high birth and death rates to low birth and death rates as a country develops from a pre-industrial to an industrialized economic system.

65. Precursor of which one of the following vitamins comes from ẞ-carotene?

Correct Answer: (a) Vitamin A
Solution:The human body converts beta-carotene into vitamin A (retinol) - beta-carotene is a precursor of vitamin A.

66. 'Lub-dup' sound is produced due to action of

Correct Answer: (c) Heart
Solution:In healthy adults, there are two normal heart sounds often described as a lub and a dub (or dup) that occur in sequence with each heartbeat. These are the first heart sound (S1) and second heart sound (S2) produced by the closing of the AV valves and semilunar valves, respectively.

67. The sun is observed to be reddish when it is near the horizon, i.e., in the morning and the evening. This is because

Correct Answer: (a) red light is least scattered by atmosphere
Solution:Tiny molecules in our atmosphere cause light to scatter. That's why our sky looks blue: it's because the atmosphere scatters the bluish component of white sunlight. And it's why the sun looks reddish when it's near the horizon. Sunlight encounters more air molecules when the sun is low in the sky than when the sun is overhead. Even more blue light is scattered away, leaving mostly the reddish scattering ∝ 1/ʎ⁴ component of white sunlight to travel the straighter path to your eyes. So the setting and rising sun looks red.

68. Thermal conductivity of aluminium, copper and stainless steel increases in the order

Correct Answer: (b) Stainless Steel < Aluminium < Copper
Solution:Among the three aluminium, copper and stainless steel copper is the best conduction of heat. Thermal conductivity (in W/m K) for copper, aluminium and stainless steel is 385, 205 and 50.2 respectively.

69. Perspiration cools the body because

Correct Answer: (b) evaporation requires latent heat
Solution:This is because when we sweat, the liquid (sweat) present on our body takes the heat equivalent to the latent heat of vaporisation from our body and therefore we feel cool.

70. The radius of the Moon is about one-fourth that of the Earth and acceleration due to gravity on the Moon is about one-sixth that on the Earth. From this, we can conclude that the ratio of mass of Earth to the mass of the Moon is about

Correct Answer: (b) 100
Solution: