4531: Consider the following statements :
At the present level of technology available in India, solar energy can be conveniently used to
I. supply hot water to residential buildings.
II. supply water for minor irrigation projects.
III. provide street lighting.
IV. electrify a cluster of villages and small towns.
Of these statements
(a) I, II, III and IV are correct.
(b) II and IV are correct
(c) I and III are correct
(d) I, II and III are correct
4532: Living organisms require at least 27 elements of which 15 are metals. Among these, those required in major quantities include
(a) Potassium, Manganese, Molybdenum & Calcium
(b) Potassium, Molybdenum, Copper & Calcium
(c) Potassium, Sodium, Magnesium & Calcium
(d) Sodium, Magnesium, Copper & Manganese
4533: A passing motorcycle causes distortion or disturbance with reception of signal in radio and T.V. The cause of this is
(a) The intense sound waves effect the small electronic devices of the receptor
(b) The vehicle's metal parts block/distort the radio waves
(c) The spark plug fitted in the engine produces electro-magnetic signals due to sparking
(d) Modern motor-cycles are fitted with electric ignition system which produces radio waves
4534: Who participated the least in the Indian National Movement?
(a) Capitalists
(b) Landlords and Merchants
(c) Princes of States
(d) Government officials
4535: There are 6 different letters and 6 correspondingly addressed envelopes. If the letters are randomly put in the envelopes, what is the probability that exactly 5 letters go into the correctly addressed envelopes?
(a) Zero
(b) 1/2
(c) 1/6
(d) 5/6