2771: When the frequency distribution is normal

(a) median, mode and mean are all different from one another
(b) mean, mode and median are identical
(c) mean is greater than mode
(d) mean is greater than median
2772: Who among the following discovered heavy water?

(a) Joseph Priestley
(b) Heinrich Hertz
(c) H. C. Urey
(d) G. Mendel
2773: Which of the following groups represents the correct order of four types of teeth in human beings?

(a) Incisors, premolars, molars, canines

(b) Incisors, canines, premolars, molars

(c) Molars, canines, incisors, premolars

(d) Canines, incisors, molars, premolars
2774: Absolute majority means ____ per cent of votes

(a) 50

(b) 66

(c) 75

(d) 80
2775: The jet aircrafts fly very easily and smoothly in the lower stratosphere. What could be the appropriate explanation?

1. There are no clouds or water vapour in the lower stratosphere.

2. There are no vertical winds in the lower stratosphere.

which of the statements given above is/are correct in this context?

(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2