General Science QUESTIONS AND ANSWERS

General Knowledge : General Science QUESTIONS AND ANSWERS :: part15 : 21 to 25

Following General Knowledge Multiple choice objective type questions and answers will help you in TRB, SSC and UPSC 2014 examinations :

21.Biological pest control is carried out by

parrots and kites

dragonfly and wasp

scorpions and spiders

bees and locust

22.Given below are two statements, labelled as Assertion (A) and Reason (R). In the context of the two statements, which of the following is correct ?Assertion (A) : Duralumin is an alloy of aluminium used in aeroplane industry.Reason (R) : Duralumin is a comparatively cheap alloy.

Both A and R are true and R is the correct explanation of A.

Both A and R are true but R is not the correct explanation of A.

A is true but R is false.

A is false but R is true.

23.Given below are two statements, labelled as Assertion (A) and Reason (R). In the context of the two statements, which of the following is correct ?Assertion (A) : Copper is widely used in electrical appliances.Reason (R) : It is a very good conductor of electricity.

Both A and R are true and R is the correct explanation of A.

Both A and R are true but R is not the correct explanation of A.

A is true but R is false.

A is false but R is true.

24.Multiplication of a large number of identical plants is done by

Ringing

Hydroponics

Layering

Tissue culture

25.When a bucket full of water is drowned in water its weight becomes less than before due to :

Density of water

Buoyancy force