2421: When one enters a dark room, he is not able to see anything but after some time his vision improves. This is because:
(a) The retina of the eye comes forward
(b) The retina of the eye moves backward
(c) The pupil of the eye contracts
(d) The pupil of the eye dilates
2422: Match List I (Naturally occurring substances) with List II (Elements) and select the correct answer using the codes given below the Lists:
List I
I. Diamond
II. Marble
III. Sand
IV. Ruby
List II
(A) Calcium
(B) Silicon
(C) Aluminium
(D) Carbon
Codes:
(a) I-C, II-A, III-B, IV-D
(b) I-D, II-B, III-A, IV-C
(c) I-B, II-A, III-C, IV-D
(d) I-D, II-A, III-B, IV-C
2423: Who among the following is a Hindustani classical singer ?
(a) Geeta Chandran
(b) Gangubai Hangal
(c) Swapnasundari
(d) Leela Samson
2424: Which of the following statements regarding laterite soils of India are correct?
1. They are generally red is colour.
2. They are rich in nitrogen and potash.
3. They are well developed is Rajasthan and UP.
4. Tapioca and cashew nuts grow well on these soils
Select the correct answer using the codes given below.
(a) 1 and 4
(b) 2 and 3 only
(c) 1, 2 and 3
(d) 2, 3 and 4
2425: With reference to the treatment of cancerous tumours, a tool called cyberknife has been making the news. In this context, which one of the following statements is not correct ?
(a) It is a robotic image guided system
(b) It delivers an extremely precise dose of radiation
(c) It has the capability of achieving sub-millimetre accuracy
(d) It can map the spread of tumour in the body