3956: In which one among the following is the speed of sound maximum ?

(a) Air at 100 degree celcius
(b) Air at 0 degree celcius
(c) Wood
(d) Water
3957: Which one of the following countries is the leading producer of uranium?

(a) United States of America
(b) Zambia
(c) Canada
(d) Germany
3958: Extrusive (Intrusive) rocks are forms of:

(a) Igneous rocks

(b) Sedimentary rocks

(c) Metamorphic rocks

(d) None of the above
3959: The increasing amount of carbon dioxide in the air is slowly raising the temperature of the atmosphere, because it absorbs

(a) the water vapour of the air and retains its heat

(b) the ultraviolet part of the solar radiation

(c) all the solar radiations

(d) the infrared part of the solar radiation
3960: Match List I (Books) with List II (Authors) and select the correct answer using the codes given below the Lists :

List I------------------ List II

I. My Music, My Life----(A) Laxman Gaikwad
II. Adha Gaon----------(B) Rahi Masoom Raza
III. Radha--------------(C) Ramakanta Rath
IV. The Pilferer---------(D) Ravi Shankar

Codes:

(a) I-C, II-B, III-D, IV-A
(b) I-D, II-B, III-C, IV-A
(c) I-D, II-A, III-C, IV-B
(d) I-C, II-A, III-D, IV-B