36: Maximum production of paddy per unit water consumption can be best achieved in a:
(a) Non-porous soil
(b) Porous soil
(c) Impervious soil
(d) Soil that allows slow percolation
37: Which one of the following statements is correct?
(a) Liquid Sodium is employed as a coolant in nuclear reactors
(b) Calcium carbonate is an ingredient of toothpaste
(c) Bordeaux mixture consists of sodium sulphate and lime
(d) Zinc amalgams are used as a dental filling
Explanation:
Liquid sodium is employed as a coolant in nuclear reactors. Bordeaux mixture consists of copper sulphate and lime. Tin amalgams are used as dental filings especially with gold and silver. Calcium Carbonate, Silica and Triclosan are key ingredients in Tooth Paste.
38: Assertion (A) :
Drinking of whisky increases the frequency of urination.
Reason (R) :
Alcohol intake speeds up the secretion of vasopressin in the body.
(a) Both A and R are individually true and R is the correct explanation of A
(b) Both A and R are individually true but R is not a correct explanation of A
(c) A is true but R is false
(d) A is false but R is true
Explanation:
Due to the inhibition of production of 'Antidiuretic hormones (ADH)' by taking whisky increases the quantity and frequency of urination.
39: The stones formed in human kidney consist mostly of
(a) calcium oxalate
(b) sodium acetate
(c) magnesium sulphate
(d) calcium
Explanation:
The stones formed in human kidney mostly consists of urates and calcium oxalate, mucopolysacharides, calcium phosphate and calcium carbonate. Urate and oxalate stones are most common.
40: If a mouse of over eight times its normal size has been produced by introducing human growth hormone gene, the technique involved is called
(a) Hybridisation
(b) Genetic engineering
(c) Mutation Breeding
(d) Hormonal feeding