(d) equal to zero
Ans : (d)
187. Consider the following statements:
       1) Indira Gandhi Centre for Atomic Research uses fast reactor technology.
       2) Atomic Minerals Directorate for Research and Exploration is engaged in heavy water production.
       3) Indian Rare Earths Limited is engaged in the manufacture of Zircon for India"s Nuclear Proqrarmme beside other rare earth
       Which of the statements given above are correct? [lAS 2004]
       (a)  1, 2 and 3
       (b)  1 and 2
       (c)  1 and 3
       (d)  2 and 3
Ans : (c)
188. One Astronomical Unit is the average distance between: [lAS 1998]
       (a) Earth and the Sun
       (b) Earth and the Moon
       (c) Jupiter and the Sun
       (d) Pluto and the Sun
Ans : (a)
189. Strips of two metals A and B are firmly joined together as shown in the figure.
On heating, A expands more than B does. If this joined strip is heated, then it will appear as: [lAS 1999]
Ans : (b)
190. The Moon is revolving in a circular orbit around Earth with a uniform speed V. If the gravitational force suddenly disappears, the
     Moon will: [NDA 2004]
     (a) continue to move with speed V along the original orbit
     (b) fall downward to Earth with increasing velocity
     (c) finally come to rest somewhere on the original path
     (d) move with the velocity V tangentially to the original orbit