41. Fathom is the unit of
(a) sound
(b) depth
(c) frequency
(d) distance
42. What is the unit for measuring the amplitude of a sound?
(a) Decibel
(b) Coulomb
(c) Hum
(d) Cycles
43. Reading of a barometer going down is an indication of
(a) snow
(b) storm
(c) intense heat
(d) rainfall
44. Decibel is the unit for
(a) speed of light
(b) radio wave frequency
(c) intensity of sound
(d) intensity of heat
45. Monazite is an ore of
(a) titanium
(b) zirconium
(c) iron
(d) thorium
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