451: In which type of rocks, fossils are more abundantly found?
(a) Igneous
(b) Metamorphic
(c) Sedimentary
(d) None of these
452: Assertion (A) :
Phenyl is used as a household germicide.
Reason (R):
Phenyl is a phenol derivative and phenol is an effective germicide.
(a) Both A and R are true, and R is the correct explanation of A
(b) Both A and R are true, but R is NOT a correct explanation of A
(c) A is true, but R is false
(d) A is false, but R is true
453: Consider the following statements:
1. National Thermal Power Corporation has diversified into hydropower sector.
2. Power Grid Corporation of India has diversified into telecom sector.
Which of the statements given above is/ are correct?
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2
454: Match the hormones in List I with items in List II and select the correct answer using the codes given below the Lists :
List I
I. Adrenaline
II. Estrogen
III. Insulin
IV. Pheromones
List II
(A) Anger, fear, danger
(B) Attracting partners through sense of smell
(C) Females
(D) Glucose
Codes:
(a) I-C, II-A, III-D, IV-B
(b) I-A, II-C, III-B, IV-D
(c) I-A, II-C, III-D, IV-B
(d) I-C, II-A, III-B, IV-D
455: Chlorination is a process used for water-purification. The disinfecting action of chlorine is mainly due to
(a) The formation of hydrochloric acid when chlorine is added to, water
(b) The formation of hypochlorous acid when chlorine is added to water
(c) The formation of nascent oxygen when chlorine is added to water
(d) The formation of hydrogen when chlorine is added to water