Latest Science and Technology General Knowledge(GK) Questions and answers

1 .

Infrared rays were first discovered by

A)

Herschel

B)

Maxwell

C)

Huygens

D)

Rayleigh

Correct Answer : Herschel

Most encyclopedias and physics books credit the great British astronomer Sir William Herschel with the discovery of infrared radiation in 1800.

2 .

Containers for carrying strong Acids are made of

A)

Brass

B)

Lead

C)

Copper

D)

Platinum

Correct Answer : Lead

3 .

Aeroponics is a technique of growing plants without

A)

Fertilizer

B)

Water

C)

Air

D)

Soil

Correct Answer : Soil

Aeroponics is the process of growing plants in an air or mist environment without the use of soil or an aggregate medium. ... Aeroponic culture differs from both conventional hydroponics, aquaponics, and in-vitro (plant tissue culture) growing.

4 .

Which greenhouse gas, other than methane, is produced by agricultural fields

A)

Chloro-fluoro-carbon

B)

Sulphur dioxide

C)

Ammonia

D)

Nitrous oxide

Correct Answer : Nitrous oxide

5 .

Litmus paper is prepared from the extract of

A)

Young

B)

Huygen

C)

Michael Faraday

D)

None of the above

Correct Answer : Michael Faraday

In 1831, Michael Faraday's experiments led to the discovery of electromagnetic induction, whereby electricity is induced by changes in a magnetic field.

6 .

Which of the following materials is combustive just on the tip of a safety match sticks

A)

Phosphorus

B)

Antimony sulphide

C)

Manganese dioxide

D)

Sulphur

Correct Answer : Phosphorus

7 .

The following is used as a lubricant heavy machines

A)

Bauxite

B)

Graphite

C)

Sulphur

D)

Phosphorus

Correct Answer : Graphite

8 .

Which one of the following types of glass can cut off the UV rays

A)

Crookes Glass

B)

Soda Glass

C)

Pyrex Glass

D)

Jena Glass

Correct Answer : Crookes Glass

Crooked Glass is a special kind of glass which contain cerium oxide and this is able to cutt off ub rays of sun and are thus used to make sunglasses.

9 .

Sound become noise pollution at

A)

35 dB

B)

60 dB

C)

80 dB

D)

100 dB

Correct Answer : 80 dB

10 .

____is a telecommunications network or computer network that extends over a large geographical distance.

A)

Simple Mail Transfer Protocol

B)

Uniform Resource Locator

C)

JavaScript

D)

Wide Area Network

Correct Answer : Wide Area Network