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456. 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.
A. Both A and R are true and R is the correct explanation of A.
B. Both A and R are true but R is not the correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.
Explanation:
457. 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.
A. Both A and R are true and R is the correct explanation of A.
B. Both A and R are true but R is not the correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.
Explanation:
458. The Contact Process is involved in the manufacture of
A. Nitric acid
B. Sulphuric acid
C. Ammonia
D. Caustic soda
Explanation:
459. Multiplication of a large number of identical plants is done by
A. Ringing
B. Hydroponics
C. Layering
D. Tissue culture
Explanation:
460. When a bucket full of water is drowned in water its weight becomes less than before due to :
A. Density of water
B. Buoyancy force
C. Pressure of water
D. Surface tension of water
Explanation:
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