Part – B (General Studies) NDA/NA SOLVED PAPER 2018 (II) (101 to 150)

Total Questions: 50

11. A ball is released from rest and rolls down an inclined plane, as shown in the following figure, requiring 4 sec to cover a distance of 100 cm along the plane:

Correct Answer: (c) θ = sin⁻¹ (1/80)
Solution:

12. The coefficient of areal expansion of a material is 1.6 × 10⁻⁵ K⁻¹. Which one of the following gives the value of coefficient of volume expansion of this material?

Correct Answer: (b) 2.4 × 10⁻⁵ K⁻¹
Solution:

13. The refractive indices of two media are denoted by n₁ and n₂ and the velocities of light in these two media are respectively v₁ and v₂. If n₂ /n₁ is 1.5, which one of the following statements is correct?

Correct Answer: (a) v₁ is 1.5 times v₂
Solution:

14. Which one of the following greenhouse gases is in largest concentration in the atmosphere?

Correct Answer: (c) Carbon dioxide
Solution:

A greenhouse gas is a gas that absorbs and emits radiant energy within the thermal infrared range. In order, the most abundant greenhouse gases atmosphere are water vapour, carbon dioxide, methane, nitrous oxide, ozone, chlorofluorocarbons and hydro fluorocarbons.

15. Match List-I with List-II and select the correct answer using the codes given below the Lists :

Correct Answer: (a)
Solution:

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

Correct Answer: (d)
Solution:

Indian Railways is divided into 17 zones, which are further sub-divided into divisions. Each zonal railway is made up of a certain number of divisions, each having a divisional headquarter. There are a total of
sixty-eight divisions.

17. Which one of the following is the correct descending order of Indian States in terms of sex ratio as per Census 2011?

Correct Answer: (c) Meghalaya — Manipur — Mizoram — Tripura
Solution:

Sex ratio is used to describe the number of females per 1000 of males. In India, it is especially significant because the ratio is heavily skewed towards men. In the Population Census of 2011, it was revealed that the population ratio of India 2011 is 943 females per 1000 of males.
As per final data (given by Union Minister of Health and Family Welfare) the correct data is
But according to the provisional data ofCensus 2011, the correct descending order is Meghalaya (989)-Manipur (987)-Mizoram (976)-Tripura (960). Hence, option (c) is correct.

18. Steppe (temperate continental) climate is not experienced in which one of the following places?

Correct Answer: (a) Pretoria
Solution:

Pretoria  is a city in the Northern part of  Gauteng  province in  South Africa. Pretoria has a  humid sub-tropical climate  with long hot rainy summers and short cool to cold, dry winters.
The mid latitude steppe climate spread over temperate grasslands is located in the interiors of the continents, which come in the westerly wind belt, but because of their more interior locations they do not get sufficient rainfall and hence the grasslands are practically treeless.

19. Which one of the following is not a process of chemical weathering?

Correct Answer: (d) Exfoliation
Solution:

Chemical weathering is caused by rainwater reacting with the mineral grains in rock to form new minerals and soluble salts. These reactions occur particularly when the water is slightly acidic.
Different types of chemical weathering are solution, oxidation and carbonation. These chemical processes occur more rapidly at higher temperature.
Weathering  is the breakdown of rocks at the Earth’s surface, by the action of rainwater, extremes of temperature and biological activity. It does not involve the removal of rock material.

20. Which one of the following statements is correct for a plane mirror?

Correct Answer: (c) The image is virtual, erect and laterally inverted.
Solution:

In a plane mirror, image formed is virtual, erect at the same distance behind the mirror as the object is in front of mirror the focal length of plane mirror is infinite and power is zero.