487. Which of the following is used in electromagnets ?
(a) Stainless steel
(b) Soft iron
(c) Cobalt
(d) Copper
488. In India, it has been found that the incidence of malaria is increasing. It is because
(a) The mosquitoes have become DDT resistant
(b) Of poor sanitary conditions
(c) Of poverty in villages
(d) Of increase in the population
489. Less dew is formed on cloudy nights because
(a) Clouds absorb the falling dew
(b) Clouds scatter moisture
(c) In cloudy nights radiation takes place very quickly
(d) In cloudy nights radiation takes place very slowly
490. Feeding of milk Cattle with cotton seeds
(a) Decreases the fat content temporarily
(b) Increases the fat content temporarily
(c) May increase or decrease the fat content
(d) Causes no change in the fat content
491. Mouth and foot diseases in the cattle are caused by
(a) Bacteria
(b) Fungi
(c) Virus
(d) Penicillium
492. Permanent hardness of water cannot be removed by
(a) Distillation
(b) Boiling
(c) The addition of washing soda
(d) Using synthetic resins
493. In summer, man with excess perspiration feels weak because of
(a) The loss of salts through evaporation
(b) The loss of water through evaporation
(c) The loss of carbohydrates through evaporation
(d) All these factors
494. The two branches of a plant give two different fruits: tomatoes and brinjals. This can be explained by
(a) Grafting one with the other
(b) Hybridization
(c) Nature’s freak
(d) Carbon dating
495. The function of the liver is
(a) To promote respiration
(b) To promote digestion of food
(c) To store glucose as glycogen
(d) None of these
496. What is the most important factor for the growth of pests in stored grains ?
(a) The temperature of grains
(b) The moisture of grains
(c) The moisture and temperature of grains
(d) None of these
497. The temperature for pasteurisation of milk is selected so as to
(a) Kill the microorganisms
(b) Kill all the bacteria
(c) Kill the microorganisms and other harmful bacteria
(d) Store it for long
498. The age of a tree can be determined by
(a) The thickness of the bark
(b) Counting the number of rings
(c) The bulk of the tree
(d) The number of leaves
499. Which of the following can be said as the “Theory of Darwin”?
(a) Weak and strong always maintain a fixed proportion
(b) Survival of the fittest and the struggle for existence
(c) Different species do not arise by genetic mutation
(d) None of these
500. Decomposition of organic matter is due to
(a) Bacteria
(b) Fungi
(c) Virus
(d) None of these
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