2452: Match List I with List II and select the correct answer by using the codes given below the lists :
List I List II
I. Visakhadatta (A) Medicine
II. Varahamihira (B) Drama
III. Charaka (C) Astronomy
IV. Brahmagupta (D) Mathematics
Codes:
(a) I - A, II - C, III - D, IV - B
(b) I - B, II - A, III - C, IV - D
(c) I - B, II - C, III - A, IV - D
(d) I - C, II - B, III - A, IV - B
2454: Which one of the following pairs of materials serves as electrodes in chargeable batteries commonly used in devices such as torchlights, electric shavers, etc?
(a) Nickel and cadmium
(b) Zinc and carbon
(c) Lead peroxide and lead
(d) Iron and cadmium