61. Who among the following laid the foundation of nuclear science in the country? [RRB 1994]
       (a) Vikram Sarabhai
       (b) Homi J. Bhabha
       (c) M. G. K. Menon
       (d) Raja Ramanna
Ans : (b)
62. Match the following: [CDS 2002]
        Scientist                   Contribution
A. S. N. Bose              1. Theory of numbers
B. S. Chandrasekhar        2. Elementary particles
                                statistics
C. S. Ramanujam            3. Astronomy
D. Aryabhatta              4. Theory of black hole
            A         B          C          D
       (a)  2         1          4          3
       (b)  4         3          2          1
       (c)  2         4          1          3
       (d)  3         1          4          2
Ans : (c)
63. Match the following: [CDS 2001]
        Discovery                      Scientist
 A.    Radioactivity         1.    Issac Newton
 B.    Relativity            2.    Roentgen
 C.    Gravitation           3.    Henry Bacquerel
 D.    X-rays                4.    Albert Einstein
            A         B          C          D
       (a) 3          1          2          4
       (b) 3          4          1          2
       (c) 1          3          4          2
       (d) 2          4          1          3
Ans : (b)
64. Match the following:
 A. X-rays                   1.    de-Broglie
 B. Wave particle            2.    Roentgen
 C. Fission                  3.    Hann and
                                   Straussman
 D.    Chain reaction        4.    Fermi
            A         B          C          D
       (a)  2         1          4          3
       (b)  4         3          2          1
       (c)  1         3          2          4
       (d)  3         2          1          4
Ans : (a)
65. A silver spoon and a book are both at room temperature. The spoon feels colder to the" touch because:
       (a) of an illusory effect
       (b) silver is an almost pure material
       (c) silver is a very good heat conductor
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