226: Consider the following features of newer models of motor cars :
I. Radial tyres
II. Streamlined body
III. Multipoint fuel injection
IV. Catalytic converter with exhaust
Which of these features make the newer models of motor cars more fuel efficient ?
(a) I and II
(b) II and III
(c) II, III and IV
(d) I, III and IV
227: Which of the following States has "Urdu" as its official language?
(a) Bihar
(b) Jammu & Kashmir
(c) Madhya Pradesh
(d) Rajasthan
228: On the Moon, astronauts inflate a rubber balloon with hydrogen gas and release it at a height of 2 metres. The balloon will:
(a) Fall down
(b) Go upwards
(c) Remain at the height of 2 metres
(d) First go up and finally come down
229: The original inhabitants of India are believed to be of the ethnic type known as
(a) Negrito
(b) Proto-Australoids
(c) Mongoloids
(d) Dravidians
230: A and B can complete work together in 5 days. If a works at twice his speed and B at half of his speed this works can be finished in 4 days. How many days would it take for A alone to complete the job ?
(A) 18
(B) 10
(C) 12
(D) 15