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Question 3574

A device that allows computer users to communicate with one another over telephone lines is called:

AMicroprocessor

BNetwork

CAssembler

DModem

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D. ModemExplanation: A modem (short for modulator-demodulator) is a device that enables computers to communicate with each other over telephone lines. It converts digital signals from a computer into analog signals for transmission and then back into digital form at the receiving end.

Question 3573

In a computer, the parity bit is added for the purpose of:

ACoding

BError detection

CControlling

DIndexing

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B. Error detectionExplanation: A parity bit is added to binary data in a computer system for error detection. It helps identify whether data has been altered during transmission or storage. The parity bit makes the total number of 1s either even (even parity) or odd (odd parity), allowing simple error checking.

Question 3572

Restarting of computer that is already on is referred to as:

ACold booting

BLogging off

CShut down

DWarm booting

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D. Warm bootingA warm boot refers to the process of restarting a computer system without completely shutting down the power.

Question 3571

Check the odd term out:

AInternet

BLinux

CUnix

DWindows

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A. InternetExplanation: Internet is the odd one out because it is a global network, whereas Linux, Unix and Windows are operating systems.

Question 3570

Which of the following computer language is used for artificial intelligence?

AFORTRAN

BCOBOL

CINDEXING

DPROLOG

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D. PROLOGExplanation: PROLOG (Programming in Logic) is a high-level programming language widely used in the field of Artificial Intelligence (AI) and computational linguistics. It is based on formal logic and is especially useful for solving problems involving pattern matching, rule-based reasoning, and natural language processing.

Question 3569

One kilobyte is equal to:

A1024 bytes

B2048 bytes

C1023 bytes

D10000 bytes

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A. 1024 bytesExplanation: One kilobyte (KB) is equal to 1024 bytes. This is because computer memory is based on the binary system (powers of 2), and 1024 = 2¹⁰. Hence, 1 KB = 1024 bytes, not 1000 bytes as in the decimal

Question 3568

Penicillin was invented by:

AChristian Bernard

BAlexander Fleming

CMc Collum

DWilliam Harvey

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B. Alexander FlemingExplanation: Penicillin was discovered accidentally by Alexander Fleming in 1928 when he observed that a fungal mold, Penicillium notatum, inhibited the growth of Staphylococcus bacteria in his culture plates. Penicillin became the first antibiotic used to treat bacterial infections and saved millions of lives during World War II. Later, scientists like Howard Florey and Ernst Boris Chain developed methods for its large-scale production.

Question 3566

In 1643, an Italian named Evangelista Torricelli invented:

AThermometer

BBarometer

CRitcher Scale

DBar Codes

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B. BarometerExplanation: In 1643, Italian scientist Evangelista Torricelli invented the barometer, an instrument used to measure atmospheric pressure. His mercury barometer demonstrated that air has weight and that atmospheric pressure can support a column of mercury in a glass tube.

Question 3385

Generally, non-metals do not conduct electricity. Which of the following conducts electricity?

ADiamond

BGraphite

CSulfur

DFullerene

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B. GraphiteExplanation: Although most non-metals do not conduct electricity, graphite is an exception. In graphite, each carbon atom is bonded to three others, leaving one free electron that moves freely between layers, allowing it to conduct electricity efficiently.

Question 3382

Most plants absorb nitrogen in the form of:

Aproteins

Bnitrates and nitrites

Curea

Dnitrates, nitrites and urea

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D. nitrates, nitrites and ureaExplanation: Nitrogen is an essential nutrient for plants, used in the synthesis of amino acids, proteins, nucleic acids, and chlorophyll. Plants absorb nitrogen from the soil primarily in the inorganic forms of nitrate (NO₃⁻) and nitrite (NO₂⁻). Urea, when applied as fertilizer, is first converted by soil bacteria into ammonia (NH₃) and then into nitrates through nitrification before being absorbed by roots. Key Steps: Ammonification: Conversion of organic nitrogen (from dead plants/animals) into ammonia. Nitrification: Conversion of ammonia into nitrites and then nitrates by bacteria like Nitrosomonas and Nitrobacter. Assimilation: Uptake of nitrates by plants to form amino acids and proteins.

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Science

A device that allows computer users to communicate with one another over telephone lines is called:

In a computer, the parity bit is added for the purpose of:

Restarting of computer that is already on is referred to as:

Check the odd term out:

Which of the following computer language is used for artificial intelligence?

One kilobyte is equal to:

Penicillin was invented by:

In 1643, an Italian named Evangelista Torricelli invented:

Generally, non-metals do not conduct electricity. Which of the following conducts electricity?

Most plants absorb nitrogen in the form of:

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