(d) Limestone and clay
Ans: (d)
50. Which synthetic fibre is known as artificial silk?
(a) Cotton
(b) Rayon
(c) Terylene
(d) Nylon
Ans: (b)
51. The major ingredient of leather is : [IAS 1988]
(a) carbohydrate
(b) collagen
(c) polymer
(d) nucleic acid
Ans: (b)
52. In the manufacturing of safety matches, which of the following materials are used to coat the two sides of match boxes?
[NDA 1992]
1) Yellow phosphorus
2) 2.Glue
3) Glass powder
4) Red phosphorus
(a) 1, 2 and 3
(b) 1, 3 and 4
(c) 1, 2 and 4
(d) 2, 3 and 4
Ans: (c)
53. Glass is made of the mixture of: [LIC 1993]
(a) quartz and mica
(b) sand and salt
(c) sand and silicates
(d) None of the above
Ans: (c)
54. Which of the following are true regarding a catalyst? [CDS 1992]
Wrong Question
1) It is a substance which increases the rate of reaction.
2) It is a substance which reduces the activation energy.
3) It is substance which is consumed in the reaction.
(a) 1 and 2
(b) 2 and 3
(c) 3 and 4
(d) 1 and 4
Ans: (a)
55. The chemical used as a "fixer" in photography is : [IAS 1995]
(a) borax
(b) sodium thiosulphate
(c) sodium sulphate
363