General Knowledge Part -B: English (NDA/NA SOLVED PAPER 2022-I) (51 to 100)

Total Questions: 50

31. A boy of mass 52 kg jumps with a horizontal velocity of 2 m/s onto a stationary cart of mass 3 kg. The cart is fixed with frictionless wheels. Which one of the following would be the speed of the cart?

Correct Answer: (b) 1.89 m/s
Solution:

32. The energy possessed by a body due to its change in position or shape is called

Correct Answer: (b) potential energy
Solution:Potential energy arises olve to change in shape size and position

33. A sound wave has a frequency of 1 kHz and wavelength 50 cm. How long will it take to travel 1 km?

Correct Answer: (d) 2s
Solution:

34. For an element with atomic number 35, which one of the following will be the correct number of electrons in its valence shell based on Bohr's model of an atom?

Correct Answer: (d) 7
Solution:Atomic number 35 belongs to halogen hence, number of valence electron will be based on Bohr's atomic model.

35. Which one of the following is not an example of a redox reaction?

Correct Answer: (a) AlCl₃ + 3H₂O→ Al(OH)₃ + 3HCI
Solution:The reaction in which oxidation and reduction takes place simultaneously are known as redox reaction.
In reaction (a) there is no change in the oxidation number of any element hence it is not a redox reaction.

36. Which one of the following allotropes of carbon is isomorphous with crystalline silicon?

Correct Answer: (b) Diamond
Solution:Three important allotropes of carbon are graphite, diamond, and fullerene. Crystal structure of diamond is isomorphous with silicon.

37. Which one of the following is the colour of hydrogen gas?

Correct Answer: (d) Colourless
Solution:Hydrogen (H₂) is a nontoxic, nonmetallic, odorless, tasteless, colorless, and highly combustible diatomic gas.

38. Which one of the following is not a pigment?

Correct Answer: (d) Silica
Solution:silica, is also known as silicon dioxide. It is compound of the two most abundant elements in Earth's crust, silicon and oxygen, SiO,. It is most commonly found in nature as quartz.
Zinc oxide is a white solid used as a pigment. Chalk is white solid made up of CaCO₃. Whitw lead is also a pigment containing mixture of lead carbonate and lead hydroxide (РЬСО₃.Pb(OH)₂)

39. Which one of the following statements about fertilizers is not correct?

Correct Answer: (a) Urea is a phosphorus-containing fertilizer.
Solution:Urea is a nitrogen containg fertilizer. It contains more percentage of nitrogen than other fertilizers. The main function of Urea fertilizer is to supplement nitrogen to the plants.

40. Which one of the following statements is not correct?

Correct Answer: (a) Most carbon compounds are good conductors of electricity.
Solution:Carbon compounds are poor conductor of electricity as they do not have the presence of free electrons.