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165341. Artificial rain is caused by spraying small pellets of which of the following over clouds?
A
NaOHB
NH4ClC
IceD
Dry iceCorrect Answer: D. Dry ice
165442. The term PVC used in the plastic industry stands for
A
Poly Vinyl ChlorideB
Phospho Vanadium ChlorideC
Phospho Vinyl ChlorideD
Poly Vinyl CarbonateCorrect Answer: A. Poly Vinyl Chloride
165543. Which among the following is responsible for the depletion of the Ozone layer?
A
ChlorofluorocarbonB
Mercuric oxideC
Carbon monoxideD
Carbon dioxideCorrect Answer: A. Chlorofluorocarbon
165644. Aluminium powder mixed with linseed oil is used as
A
InsecticideB
ExplosiveC
PaintD
FertilizerCorrect Answer: C. Paint
165745. The half-life period of an isotope is 2 hours After 6 hours what fraction of the initial quantity of the isotope will be left behind?
A
1/8B
1/4C
1/6D
1/3Correct Answer: A. 1/8
165846. Nuclei of radioactive elements emit
A
Either protons or neutronsB
Neither protons nor neutronsC
NeutronsD
ProtonsCorrect Answer: B. Neither protons nor neutrons
165947. L.P.G. Cylinders contain inside
A
Isobutane and PropaneB
Butane, Isobutane, and PropaneC
Butane and IsobutaneD
Butane and PropaneCorrect Answer: B. Butane, Isobutane, and Propane
166048. Which one of the following is an element?
A
GraphiteB
GlassC
Table saltD
WaterCorrect Answer: A. Graphite
166149. At constant temperature, if the pressure decrease, then the volume of a given mass of gas will
A
Remain constantB
May increase or decrease depending on the nature of the gasC
IncreaseD
DecreaseCorrect Answer: C. Increase
166250. Which of the following is physical change?
A
Magnetizing a needleB
Rusting of ironC
Radioactive decayD
PhotosynthesisCorrect Answer: A. Magnetizing a needle
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