486: The age of a father is twice that of the elder son. Ten years hence the age of the father will be three times that of the younger son. If the difference of ages of the two sons is 15 years, the age of the father is
(a) 100 years
(b) 70 years
(c) 60 years
(d) 50 years
487: Match List I with List II and select the correct answer using the codes given below the Lists :
List I ------------------ List II
(Minerals) ------------- (Major producer)
I. Mineral oil ------------ (A) Zambia
II. Copper -------------- (B) Guyana
III. Manganese ---------- (C) Venezuela
IV. Bauxite -------------- (D) Gabon
Codes:
(a) I-C, II-A, III-D, IV-B
(b) I-C, II-A, III-B, IV-D
(c) I-A, II-C, III-B, IV-D
(d) I-A, II-C, III-D, IV-B
488: When you travel in Himalayas, you will see the following :
1. Deep gorges
2. U-turn river courses
3. Parallel mountain ranges
4. Steep gradients causing land-sliding
Which of the above can be said to be the evidences for Himalayas being young fold mountains?
(a) 1 and 2 only
(b) 1, 2 and 4 only
(c) 3 and 4 only
(d) 1, 2, 3 and 4
489: In the given figure, the site of the Tehri dam has been labelled as
(a) A
(b) B
(c) C
(d) D
490: With reference to solar power production in India, consider the following statements:
1. India is the third largest in the world in the manufacture of silicon wafers used in photovoltaic units.
2. The solar power tariffs are determined by the Solar Energy Corporation of India.
Which of the statements given above is/are correct?
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2