21. Which
is hardest material ever known in the universe?
(A) Platinum (B)
Graphite
(C) Diamond (D)
Marble
Answer: C
22. Which
instrument regulates the resistance or current in a circuit?
(A) Volta cell (B)
Rheostat
(C) Generator (D) Sonometre
Answer: B
23. The
scientist who formulated the “Germ theory of disease” is:
(A) Louis Pasteur (B)
Lamarck
(C) Hugo Devries (D)
Griger Mendel
Answer: A
24. In
which atmospheric level ozone gas is seen?
(A) Mesosphere (B)
Lithosphere
(C) Stratosphere (D)
Ionosphere
Answer: C
25. Which
is the relay centre in our brain?
(A) Pituitary gland (B)
Thalamus
(C) Spinal cord (D) Meninges
Answer: B
26. Methane
gas is invented by the scientist:
(A) Alexandro Volta (B)
Alexander Fleming
(C) John Dalton (D)
Thomas Alwa Edison
Answer: A
27. Which
of the following units is usually used to denote the intensity of pollution?
(A) Milligrams (B) Nanograms
(C) Parts per million (D)
Kilogram
Answer: C
28. Nitrogen
fixing bacteria lives in the root tumours of pea-plants is called:
(A) Rhizome (B)
Rhizobium
(C) E.coli (D)
Streptococcus
Answer: B
29. Which
of the following chemicals is used in fire extinguishers?
(A) Sodium bicarbonate (B)
Sodium nitrate
(C) Potassium bicarbonate (D) Sodium chloride
Answer: X
30. Which
phenomenon of light is behind the rainbow?
(A) Diffraction (B)
Scattering
(C) Reflection (D)
Radiation
Answer: X
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