71: Assertion (A) :
Large cold storage plants use ammonia as refrigerant while domestic refrigerators use chlorofluorocarbons.
Reason (R) :
Ammonia can be liquefied at ambient temperatures at low pressures.
(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
72: Match List I with List II and select the correct answer using the codes given below the lists :
List I List II
(Minerals) (Mining area)
I. Graphite (A) Bellary
II. Lead (B) Didwana
III. Salt (C) Rampa
IV. Silver (D) Zawar
Codes:
(a) I-C, II-D, III-A, IV-B
(b) I-A, II-D, III-B, IV-C
(c) I-C, II-A, III-D, IV-B
(d) I-B, II-C, III-A, IV-D
73: The blood pressure values of four persons are given below :
1. Mrs. X : 90/60
2. Mr. X : 160/120
3. Mr. Y : 120/80
4. Mrs. Y : 140/100
Who among the following has normal blood pressure?
(a) Mrs. X
(b) Mr. X
(c) Mrs. Y
(d) Mr. Y
74: What is the common feature in insects like ant and cockroach?
(a) They bite and chew their food
(b) They live in temperate climate conditions
(c) They have cutting and sucking type of mouth parts
(d) They are social insects
75: In addition to fingerprint scanning, which of the following can be used in the biometric identification of a person ?
1. Iris scanning
2. Retinal scanning
3. Voice recognition
Select the correct answer using the code given below:
(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3 only