436: Ice cubes are floating in a glass of water. When the ice cubes melt, the water level in the glass:
(a) Will first increase and then start decreasing
(b) Will first decrease and then start increasing
(c) Will remain unchanged
(d) Will increase
437: Kahuta is:
(a) A bird sanctuary in Tamil Nadu
(b) A tribe of Mizoram
(c) A place in Pakistan where nuclear research centre is located
(d) None of the above
438: Directive Principles of State Policy are included in which part of the Indian Constitution?
(a) Part IV
(b) Part III
(c) Part II
(d) Part I
439: Which one of the following statements is correct?
(a) Cirrus clouds are composed of ice crystals.
(b) Cirrus clouds exhibit a flat base and have the appearance of rising domes.
(c) Cumulus clouds are white and thin, and form delicate patches and give a fibrous and feathery appearance.
(d) Cumulus clouds are classified as high clouds.
440: Photo chemical smog is a resultant of the reaction among.
(a) NO2, O3 and peroxyacetyl nitrate in the presence of sunlight
(b) CO, O2 and peroxyacetyl nitrate in the presence of sunlight
(c) CO, CO2 and NO2 at low temperature
(d) High concentration of NO2, O3 and CO in the evening