When white light is passed through a prism, it splits into ______ colours.
A. 5
B. 6
C. 7
D. 8
The density of a gas increases, when ________?
A. Temperature is increased
B. Pressure is increased
C. Volume is kept constant
D. None of these
The crystal of ice is an example of
A. Metallic solid
B. Molecular solid
C. Covalent solid
D. Ionic solid
Two successive discounts of 20% and 20% are equivalent to a Single-discount of which of the following?
A. 42%
B. 40%
C. 36%
D. 34%
A number is increased by 10% and then decreased by 10%. The net change in the number is __________?
A. no increase or decrease
B. 2% decrease
C. 1% increase
D. 1% decrease
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