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

Total Questions: 50

41. The time period of oscillation of a simple pendulum having length L and mass of the bob m is given as T. If the length of the pendulum is increased to 4L and the mass of the bob is increased to 2 m, then which one of the following is the new time period of oscillation?

Correct Answer: (b) 2T
Solution:

42. The connecting cable of electrical appliances like electric iron, water heater or room heater contains three insulated copper wires of three different colours—red, green and black. Which one of the following is the correct colour code?

Correct Answer: (c) Red–live wire, Green–ground wire, Black–neutral wire
Solution:

Red-Live wire (brings the current)
Green − Ground wire
Black − Neutral wire

43. The graphs between current (I) and voltage (V) for three linear resistors 1, 2 and 3 are given below:

If R₁, R₂ and R₃ are the resistances of these resistors, then which one of the following is correct?

Correct Answer: (b) R₁ < R₃ < R₂
Solution:

44. Consider the following statements about a microscope and a telescope:

1. Both the eyepiece and the objective of a microscope are convex lenses.
2. The focal length of the objective of a telescope is larger than the focal length of its eyepiece.
3. The magnification of a telescope increases with the increase in focal length of its objective.
4. The magnification of a microscope increases with the increase in focal length of its objective.
Which of the statements given above are correct?

Correct Answer: (d) 1, 2 and 3
Solution:

(1) Microscope consists of two convex lenses coaxially separated by some distance. The lens nearer to the object is called the objective. The lens through which the final image is viewed is called the eyepiece.
(2) The focal length of the objective of a telescope is larger than the focal length of eyepiece because objective has much larger aperture than the eyepiece.
(3) Magnification of telescope is directly proportional the focal length of obejctive (f₀). Hence, the focal length of telescope increases with the increase in focal length of its objective.
Hence, statements (1), (2) and (3) are the correct.

45. A planet has a mass M₁ and radius R₁. The value of acceleration due to gravity on its surface is g₁. There is another planet 2, whose mass and radius both are two times that of the first planet. Which one of the following is the acceleration due to gravity on the surface of planet 2?

Correct Answer: (c) g₁/2
Solution:

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

Correct Answer: (b)
Solution:

Uttarkashi lies in Bhagirathi basin. Pauri lies in Alaknanda basin. Lansdowne lies in Nayar basin. Narendra Nagar lies in Ganga basin.

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

Correct Answer: (c)
Solution:

Yamo is warm and dry wind that blows down the steep valleys in Japan. Black roller is a very strong and dust-laden wind blowing from the South–West or North-West in the Great Plains of North America.
Bise is a cold, dry wind in Switzerland and France. A haboob is a type of intense dust storm that blows in Sudan.

48. ‘Majuli’, the river island, is located in which one of the following rivers?

Correct Answer: (d) Brahmaputra
Solution:

Majuli is a river island, located in Asom. It is formed by river Brahmaputra. In 2016, Majuli became the first island to be made a district in India. It is often claimed to be the world's largest river island.

49. Which one of the following Indian States has recorded negative growth of population as per Census 2011?

Correct Answer: (d) Nagaland
Solution:

As per Census 2011, Nagaland is the only state of the country which has negative growth rate of -0.58%. Growth rate of Indian population was 17.69% between 2001 and 2011.

50. Which one of the following types of cloud is characterised by continuous precipitation?

Correct Answer: (c) Nimbostratus
Solution:

Clouds are visible accumulations of tiny water droplets or ice crystals in the Earth’s atmosphere. Nimbostratus clouds bring continuous precipitation that can last for many hours. These low-level clouds are full of moisture.