556: Which one of the following is a breed of cattle famous for high milk yield as well as draught capacity?
(a) The Kankrey
(b) The Tharparkar
(c) The Haryana breed
(d) The Rathi breed
557: Salts of which of the following elements provide colours to fireworks?
(a) Zinc and sulphur
(b) Potassium and mercury
(c) Strontium and barium
(d) Chromium and nickel
558: Ice skating can be used to demonstrate that when ice is under pressure, its:
(a) Melting point is lowered
(b) Melting point is raised
(c) Melting point remains unchanged
(d) Coefficient of friction with metal is reduced
559: Which one of the following is used for dating archaeological specimens in wood, bones and shells?
(a) Uranium-238
(b) Argon isotope
(c) Carbon-14
(d) Strontium-90
560: Which of the following is not an element of the bone?
(a) Calcium
(b) Phosphorus
(c) Carbon
(d) Oxygen