11) Who discovered antiseptic surgery?
a) Alexander Fleming
b) Edward Jenner
c) Joseph Lister
d) Louis Pasteur
12) When is World Forestry Day celebrated?
a) March 3
b) March 21
c) March 22
d) March 23
13) What is the scientific name of Laughing Gas?
a) Nitrous Oxide
b) Phosphorous Pentoxide
c) Sodium Bicarbonate
d) Carbon Tetrachloride
14) Which of the following uses radio waves to determine the range, altitude, direction, or speed of objects?
a) Lidar
b) LORAN
c) Radar
d) Sonar
15) In which months are Kharif crops harvested?
a.) March – April
b.) May – June
c.) June July
d.) August- September
e.) October- November
16) _______________ causes biomagnification problem in the Ecosystem.
a.) Lead
b.) Mercury
c.) Chromium
d.) Copper
17) The chemical (ethyl mercaptan) added to the otherwise odourless LPG cooking gas for imparting a detectable smell to the gas is a compound of
a) bromine
b) fluorine
c) chlorine
d) sulphur
18) Air is a/an
a) compound
b) element
c) electrolyte
d) mixture
19) According to Avogadro’s Hypothesis, the smallest particle of an element or a compound, that can exist independently, is called ____ .
a) a molecule
b) a cation
c) an anion
d) an atom
20) Deep blue colour is imparted to glass by the presence of
a) cupric oxide
b) nickel oxide
c) cobalt oxide
d) iron oxide