3741: The rainbow and the rainbow-like colours seen on a thin film of oil on a water surface are two phenomena. They are
(a) Similar in nature and both are due to refraction of light
(b) Different in nature and rainbow is due to interference of light, while colour of thin film is due to diffraction
(c) Similar in nature and both are due to interference of light
(d) Different in nature and rainbow is due to refraction, while colour of thin film is due to interference of light
3742: The Basque separatist organisation is active in
(a) Russia
(b) Cyprus
(c) Portugal
(d) Spain
3743: With reference to 'fly ash' produced by the power plants using coal as fuel, which of the following statements is/are correct?
1. Fly ash can be used in the production of bricks for building construction.
2. Fly ash can be used as a replacement for some of the Portland cement concrete.
3. Fly ash is made up of silicon dioxide and calcium oxide only, and does not contain any toxic elements.
Select the correct answer using the code given below.
(a) 1 and 2
(b) 2 only
(c) 1 and 3
(d) 3 only
3744: Match List I with List II and select the correct answer using the codes given below the Lists :
List I---------------- List II
(Industries)--------------- (Industrial Centres)
I. Pearl fishing--------- (A) Pune
II. Automobiles---------- (B) Tuticorin
III. Ship-building----------- (C) Pinjore
IV. Engineering goods---------- (D) Marmagao
Codes:
(a) I-B, II-A, III-D, IV-C
(b) I-B, II-A, III-C, IV-D
(c) I-A, II-B, III-D, IV-C
(d) I-A, II-B, III-C, IV-D
3745: Two taps can fill a tank separately in 20 minutes and 30 minutes respectively. If both the taps are opened simultaneously, then the tank can be filled in:
(a) 50 minutes
(b) 15 minutes
(c) 12 minutes
(d) 10 minutes