English (Part – B) (NDA SOLVED PAPER 2020 – II) (101 to 150)

Total Questions: 50

31. The part of the human eye on which the image is formed is

Correct Answer: (c) retina
Solution:

Retina is the light sensitive surface of eye on which the image is formed.

32. Consider the following image:

A proton enters a magnetic field at right angles to it, as shown above. The direction of force acting on the proton will be

Correct Answer: (c) out of the page
Solution:

According to Fleming’s left hand rule, the direction of force on conductor is perpendicular to the direction of magnetic field and current.
The direction of current is taken same as the direction of motion of positive charge (proton), therefore, the force on proton is directed out of the page.

33. Which one of the following statements about sound is not correct?

Correct Answer: (b) Sound waves are transverse waves
Solution:

Sound waves are longitudinal waves, but they are not transverse waves. In sound waves, the individual particles of the medium move in a direction parallel to the direction of propagation of the disturbance.

34. When the short circuit condition occurs, the current in the circuit

Correct Answer: (c) increases substantially
Solution:

35. Which one of the following is not a component of human male reproductive system?

Correct Answer: (a) Cervix
Solution:

Cervix is a part of female reproductive system. Rest Urethra, seminal vesicle and Vas deferens are parts of male reproductive system. It is the lower part of uterus having marrow tube-like structure forming vegina.

36. Which one of the following is not a reason of decrease in biodiversity?

Correct Answer: (c) Maintaining sacred groves
Solution:

Maintaining sacred groves is not a reason of decreasing biodiversity. It is an in-situ conservation method which provide protection to the organisms in some area in its natural habitat. Rest three are the causes of decrease of biodiversity.

37. Which one of the following is not a cause of depletion in groundwater?

Correct Answer: (a) Afforestation
Solution:

Groundwater will not be depleted in case afforestation. Afforestation refers to planting of various types of trees over a particular area. This allows rain and surface water to percolate with in the soil and prevents surface run off of water. It also helps in recharging or refilling the groundwater level.
Hence, the water table rises up and clear uncontaminated water is available. But in all other options, groundwater will be depleted without getting recharge.

38. Which one of the following types of radiations has the smallest wavelength ?

Correct Answer: (d) X-rays
Solution:

39. The instrument used for detecting the presence of electric current in a circuit is

Correct Answer: (b) Galvanometer
Solution:

Galvanometer is an instrument used for detecting the electric current in a circuit. Galvanometer is used to measured small amount of current in the circuit.

40. Which one of the following is the largest composition in biogas?

Correct Answer: (b) Methane
Solution:

Biogas is generally composed of methane (55-65%), carbondioxide (35-45%), nitrogen (0-3%), hydrogen (0-1%) and hydrogen sulfide (0-1%). Thus, methane has the largest composition in biogas.