4166: In 1930, a person's age was 8 times that of his son. In 1938, the father's age became ten times that of his son's age in 1930. The ages of the son and father in 1940 were, respectively.
(a) 16 years, 58 years
(b) 15 years, 50 years
(c) 14 years, 42 years
(d) 13 years, 34 years
4167: Which of the following elements are present in all proteins ?
I. Carbon
II. Hydrogen
III. Oxygen
IV. Nitrogen
Select the correct answer from the codes given below :
Codes :
(a) II and III
(b) I, II and IV
(c) I, III and IV
(d) I, II, III and IV
4168: The deficiency of Vitamin D causes:
(a) Rickets
(b) Night blindness
(c) Pellagra
(d) Scurvy
4169: Caldera is a feature associated with
(a) Volcanoes
(b) Earthquakes
(c) Folding of rocks
(d) Faulting of mountains
4170: Climate is extreme, rainfall is scanty and the people used to be nomadic herders.
The above statement best describes which of the following regions?
(a) African Savannah
(b) Central Asian Steppe
(c) North American Prairie
(d) Siberian Tundra