Haryana Police Exam (07.08.2021)

31. How many electrons taken together make one coulomb?

(1) 6.25 × 10¹⁸electrons
(2) 3.25 × 10¹⁸electrons
(3) 2.25 × 10¹⁸electrons
(4) 4.25 × 10¹⁸electrons

Correct Answer: (1) 6.25 × 10¹⁸electrons

Solution:The coulomb is the SI unit for electric charge.

6.25 x 10-18 electrons are required to make one coulomb of charge.

32. One ohm is equal to:

(1) 1 volt/1 ampere
(2) 1 volt/1 coulomb
(3) 1 volt x 1 ampere
(4) 1 volt x 1 coulomb

Correct Answer: (1) 1 volt/1 ampere

Solution:1 ohm is equal to one volt (V)/ one ampere (IA).

1 Ohm is defined as the resistance of a conductor with a potential difference of 1 volt applied to the ends through which 1-ampere current flows.
Ohms is the Si unit of electrical resistance.

33. In which from the chemical compound RDX is used?

(1) As an composition
(2) As an reactor
(3) As an explosive
(4) As an nuclear weapon

Correct Answer: (3) As an explosive

Solution:RDX is a white crystalline solid also known as Royal Demolition explosive that is mixed with other explosives, oils, or waxes in making military munitions and other products.

It is used in a large number of explosives and demolition blocks.

34. Bio-chemical compounds are used as

(1) Treatments skin
(2) Food preservatives
(3) Cooking Oils
(4) All of the above

Correct Answer: (4) All of the above

Solution:A biochemical compound is any carbon based compound that is found in living things. Biochemical compounds make up the cells and tissues of living things.

They are also involved in all life processes, including making and using food for energy.

35. Which of the following indicator used in determination of hardness?

(1) EBT
(2) Phenop phthalein
(3) Methyl orange
(4) Thymol blues

Correct Answer: (1) EBT

Solution:Eriochrome Black T is a complexometric indicator that is used in complexometric titrations, which is mainly used to determine total hardness of Water.

Total hardness is due to the presence of bicarbonates. chlorides and sulphates of calcium and magnesium ions.

36. Who made the first electronic computer ENIAC?

(1) Van Neumann
(2) Joseph M Jacquard
(3) Jay Presper Eckert
(4) Both (1) and (2)

Correct Answer: (3) Jay Presper Eckert

Solution:Originally announced on Vita February 14, 1946, the Electronic Numerical Integrator and Computer (ENIAC), was the first general-purpose electronic computer.

John Mauchly and J. Presper Eckert built the machine at the University of Pennsylvania.

37. Which of the following is the largest unit of storage?

(1) GB
(2) KB
(3) MB
(4) TB

Correct Answer: (4) TB

Solution:

Kilobyte (KB): 1024 bytes
Megabyte (MB): 1024 kilobytes
Gigabyte (GB): 1024 megabytes
Terabyte (TB): 1024 gigabytes

38. The program which is permanently stored in the ROM in the form of hardware is known as ?

(1) Hardware
(2) Software
(3) Firmware
(4) Romware

Correct Answer: (3) Firmware

Solution:Firmware is a software program or set of instructions programmed on a hardware device. It provides the necessary Instructions for how the device communicates with the other computer hardware.

Firmware is typically stored in the flash ROM of a hardware device. While ROM is "readonly memory," flash ROM can be erased and rewritten because it is actually a type of flash memory.

39. ________is the process of dividing a disk into tracks and sectors.

(1) Tracking
(2) Formatting
(3) Crashing
(4) Allotting

Correct Answer: (2) Formatting

Solution:The process of dividing the disk into tracks and sectors is called as formatting.

Formatting is a process of configuring data storage device such as hard disk drive, sol-id-state drive, floppy disk, or USB flash drive for initial use.
Actually, the whole disk formatting process consists of three parts: low level formatting, partitioning, and high level formatting.

40. What is the permanent memory built into your computer called?

(1) RAM
(2) Floppy
(3) CPU
(4) ROM

Correct Answer: (4) ROM

Solution:The permanent memory of a computer is known as ROM(Read only memory).

It is a non-volatile memory that stores information permanently, even when the power is turned off.