English (Part – B) (General studies) NDA/NA SOLVED PAPER 2019 (II) (51 to 100)

Total Questions: 50

31. Who among the following popularised the use of embryological characters in taxonomy?

Correct Answer: (b) Panchanan Maheshwari
Solution:

Panchanan Maheshwari popularised the use of embryological characters in taxonomy. He is also known as ‘The Father of Indian Plant Embryology’.

32. Water is heated with a coil of resistance R connected to domestic supply. The rise of temperature of water will depend on:

1. supply voltage
2. current passing through the coil
3. time for which voltage is supplied
Select the correct answer using the codes given below.

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

33. A pendulum clock is lifted to a height where the gravitational acceleration has a certain value of g. Another pendulum clock of same length, but of double the mass of the bob is lifted to another height where the gravitational acceleration is g/2. The time period of the second pendulum would be (in terms of period T of the first pendulum)

Correct Answer: (a) √2 T
Solution:

34. The loudness of sound depends upon the:

Correct Answer: (b) amplitude of the sound waves
Solution:

Loudness of sound wave is depend on its amplitude, while sharpness of sound wave is depend on its frequency. Hence, option (b) is correct.

35. Two bodies of mass M each are placed R distance apart. In another system, two bodies of mass 2M each are placed R/2 distance apart. If F be the gravitational force between the bodies in the first system, then the gravitational force between the bodies in the second system will be:

Correct Answer: (a) 16 F
Solution:

36. Light rays move in straight lines. But through an optical fibre, they can move in any type of zig-zag path because:

Correct Answer: (d) successive total internal reflections occur as a ray moves through the fibre
Solution:

The working of optical fibre is based on the total internal reflection. Its inner part is core of higher refractive index surrounded by another layer of glass of lower refractive index. It is surrounded by plastic jacket.
When light enters from the one end of the core and moves towards cladding, then total internal reflection takes place again and again and light propagate through it. Optical fibres are used in decorative table lamps.

37. Which one of the following statements regarding cathode rays is not correct?

Correct Answer: (b) Cathode ray particles start from anode and move towards cathode
Solution:

Cathode rays start from cathode and move towards anode, because they are made of negatively charged electrons.
Hence, option (b) is incorrect statement.

38. A very large volume of hydrogen can be accommodated by making:

Correct Answer: (c) non-stoichiometric hydrides
Solution:

A very large volume of hydrogen can be accommodated by making non-stoichiometric hydrides. Such hydrides are formed by some of the metals (e.g. Pd, Pt). This property of hydrogen has high potential for hydrogen storage .

39. Which one of the following is not a monoatomic element?

Correct Answer: (c) Iodine
Solution:

Among the given species, only iodine is not a monoatomic element. It exists in the form of I2 (diatomic), while rest occur as monoatomic element.

40. Which one of the following represents the correct order of electron releasing tendency of metals?

Correct Answer: (a) Zn > Cu > Ag
Solution: