526: "Black holes" refers to
(a) Holes occurring in heavenly bodies
(b) Bright spots on the sun
(c) Collapsing object of high density
(d) Collapsing object of low density
527: Which one of the following pairs is not correctly matched ?
(a) Govind Sagar Dam : Satluj River
(b) Ukai Reservoir Dam : Tapi River
(c) Kolleru Lake : Krishna River
(d) Wular Lake : Jhelum River
528: High tides at antipodes are caused due to:
(a) Gravitational pull of the moon and the sun
(b) Gravitational pull of the sun
(c) Centrifugal, centripetal and gravitational pull of the sun
(d) Centrifugal, centripetal and gravitational pull of the sun and the moon
529: Which one of the following polymers is widely used for making bullet proof material ?
(a) Polyvinyl chloride
(b) Polyamides
(c) Polyethylene
(d) Polycarbonates
530: Which of the following Acts gave representation to Indians for the first time in legislatures?
(a) The Indian Councils Act. 1909
(b) The Indian Councils Act, 1919
(c) The Government of India Act, 1935
(d) None of the above