71: Who among the following invented Lasers?
(a) Theodore Maiman
(b) William Morton
(c) Francis Crick
(d) Denis Papin
72: Which of the following is/are the principal feature(s) of the Government of India Act, 1919?
1. Introduction of dyarchy in the executive government of the provinces
2. Introduction of separate communal electorates for Muslims
3. Devolution of legislative authority by the centre to the provinces
Select the correct answer using the codes given below :
(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3
73: Who of the following had first deciphered the edicts of Emperor Ashoka?
(a) Georg Bilhler
(b) James Prinsep
(c) Max Muller
(d) William Jones
74: Why is a plant called Prosopis juliflora often mentioned in news ?
(a) Its extract is widely used in cosmetics.
(b) It tends to reduce the biodiversity in the area in which it grows.
(c) Its extract is used in the synthesis of pesticides.
(d) None of the above
75: Assertion (A) : Cellulose is used in making shatter proof glass.
Reason (R) : Polysaccharides are not soluble in water.
(a) Both A and R are individually true and R is the correct explanation of A
(b) Both A and R are individually true but R is not the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true