836: The escape velocity from the earth's surface is about:
(a) 30 km/sec
(b) 6 km/sec
(c) 11.2 km/sec
(d) 300 km/sec
837: Match List-I with List-II and select the correct answer using the codes given below the lists:
List-I (Author) -- List-II (Work)
A. Bankim Chandra Chatterji -- 1. Shatranj Ke Khiladi
B. Dinabandhu Mitra -- 2. Debi Chaudhurani
C. Premchand -- 3. Nil-Darpan
ABC
(a) 321
(b) 123
(c) 2 3 1
(d) 312
838: After Chauri Chaura incident in which 22 policemen were killed, the result was that:
(a) Gandhiji started his Dandi March
(b) Gandhiji called off the no tax campaign
(c) Gandhiji withdrew his movement of non-cooperation
(d) Gandhiji went to-talk with the Viceroy, Lord Irwin
839: India has experienced persistent and high food inflation in the recent past,what could be the reasons?
1.Due to a gradual switchover to the cultivation of commercial crops, the area under the cultivation of food grains has steadily decreased in the last five years by about 30%.
2. As a consequnce of increasing incomes, the consumption patterns of the people have undergone a significant change.
3. The food supply chain has structural constraints.
Which of the statements given above are correct ?
(a) 1 and 2 only
(b) 1 and 3 only
(c) 2 and 3 only
(d) 1, 2 and 3
840: If a potato is placed on a pure paper plate which is white and unprinted and put in a microwave oven, the potato heats up but the paper plate does not. This is because:
(a) Potato contains water whereas paper does not contain water
(b) Potato transmits microwaves whereas paper reflects microwaves
(c) Potato is mainly made up of starch whereas paper is mainly made up of cellulose
(d) Potato is a fresh organic material whereas' paper is a dead organic material