936: 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
937: A hollow sphere of radius R, a hollow cube of side R and a thin circular plate of radius R, made up of the same material, are all heated to 20°C above room temperature. When left to cool in the room, which of them will reach the room temperature first?
(a) Circular plate
(b) Cube
(c) Sphere
(d) All of them will reach the room temperature at the same time
938: Match List I with List II and select the correct answer using the codes given below the Lists :
List I-------------------List II
I. German Silver---------(A) Tin
II. Solder----------------(B) Nickel
III. Bleaching Powder-----(C) Sodium
IV. Hypo-----------------(D) Chlorine
Codes:
(a) I-A, II-B, III-D, IV-C
(b) I-B, II-A, III-C, IV-D
(c) I-A, II-B, III-C, IV-D
(d) I-B, II-A, III-D, IV-C
939: Which of the following is not true about Mughal army?
(a) Mughal army was mainly standing army.
(b) It had large cavalry.
(c) When Mughal army used to come out, it seemed as if population of a big city is emerging.
(d) It had large infantry.
940: Rajiv Gandhi National Flying Institute is being established in which State?
(a) Maharashtra
(b) Kerala
(c) Karnataka
(d) Orissa