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

Total Questions: 50

11. Which one of the following is a covalent compound?

Correct Answer: (c) Silicon carbide
Solution:Calcium oxide (CaO), Calcium nitride (Ca₃, N), Zinc sulphide (ZnS) are ionic compounds
Silicon carbide (SiC) is a covalent compound as this compound is linked by strong covalent bonding, Its structure is similar to diamond. It is vary hard to break,

12. The mass number of argon is 40. Which one of the following statements is correct?

Correct Answer: (c) The number of electrons in argon is 18.
Solution:Argon is monatomic noble gas.
Atomic number of Argon is 18
No.of proton of Ar = No Of electron = 18
Number of neutron = Mass number - number of proton 40-18 = 22.

13. Which one of the following is the correct order of the valencies of elements Ne, Si, N and Mg?

Correct Answer: (a) Ne < Mg < N < Si
Solution:Correct order of valency of the given element is
Ne<Mg<N<Si
0       2     3    4

14. The frequency of an alternating current is 3 Hz. It implies that

Correct Answer: (b) there are 3 cycles/s
Solution:|HZ = |Cycle| sec
So, 3Hz = 3 cycles/ sec

15. Which one of the following correctly represents the SI unit of resistivity?

Correct Answer: (d) Ωm
Solution:

16. What is the current required to light a 60 W incandescent bulb in a domestic supply of 240 V?

Correct Answer: (b) 0.25 A
Solution:P = VI
I = P/V
= 60/240 = 0.25 A

17. The magnetic field produced by a current-carrying straight wire at a point outside the wire depends

Correct Answer: (a) inversely on the distance from it
Solution:

18. What is the dimension of gravitational constant?

Correct Answer: (b) M⁻¹L³T⁻²
Solution:

19. A ball is thrown vertically upward with a speed of 40 m/s. The time taken by the ball to reach the maximum height would be approximately

Correct Answer: (c) 4 s
Solution:

20. The time period of a 1 m long pendulum approximates to

Correct Answer: (c) 2 s
Solution: