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151.The Earth's internal heat
mainly comes from
A. Liquid hydrogen
B. Chemical reactions
C. Radioactive decay
D. Molecular kinetic energy
152.There are different
reasons on the Earth because of
A. Rotation of the Earth
B. Revolution of the Earth
C. The Earth's axis is
tilted
D. The Earth's distance from
the Sun
153.On average, Air contains
________ % of water vapour.
A. 1
B. 3
C. 5
D. 7
154.Earth's troposphere
extends from the Earth's surface to an average height of about ________ km.
A. 10
B. 12
C. 15
D. 17
155.The science of lightning
is called
A. Aerology
B. Meteorology
C. Electeorology
D. Fulminology
156.Ships use ________ to
find the depth of the ocean beneath them.
A. Pictches
B. Echoes
C. Frequencies
D. None of these
157.Molecules with identical
molecular formulae but with different structural formulae are called
A. Isomers
B. Isotopes
C. Atomic number
D. Mass number
158.The anode is the
electrode connected to the ________ terminal of a battery.
A. Positive
B. Negative
C. Neutral
D. Free
159.The unit used to measure
humidity is
A. Barometer
B. Hydrometer
C. Hygrometer
D. Galvanometer
160.Laser was invented by
A. Volta
B. Sturgeon
C. Hero
D. Maiman
ANSWERS:
151.C
152.C
153.A
154.B
155.D
156.B
157.A
158.A
159.C
160.D
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