71. Which substance can be used to melt the ice on icy roads?
A) Salt
(B) Chlorine
(C) Carbon dioxide
(D) Water
72. The Sun’s mass is mainly consists of
A) hydrogen
(B) Nitrogen
(C) Carbon dioxide
(D) Helium
73. The second main constituent of the Sun’s mass is
(A) Argon
(B) Nitrogen
(C) Carbon dioxide
D) Helium
74. What plays an important role in determining the hottest temperature the human body can tolerate?
(A) Altitude
B) Humidity
(C) Pollution
(D) Type of gases
75. Transformers are used to change __ voltage levels.
A) Alternating current
(B) Direct current
(C) Circuit
(D) None of these
76. What type of rocks are formed when continental plates collide with each other?
(A) Igneous rocks
(B) Sedimentary rocks
C) Metamorphic rocks
(D) Marble and onyx
77. Rocks formed when magma or lava cools on Earth’s surface are called
A) Igneous rocks
(B) Sedimentary rocks
(C) Metamorphic rocks
(D) Marble and onyx
78. The amount of sunlight on the surface of the Earth varies because of the Earth’s
A) Axial tilt
(B) Rotation
(C) Revolution
(D) Poles
79. What prevents the earth’s atmosphere from drifting away into space?
A: Ozone layer
B: Gravity
C: Troposphere
D: Ecosystem
80. Density of Milk is___?
A: 1.034 g/cm3
B: 1.024 g/cm3
C: 1.044 g/cm3
D: 1.054 g/cm3
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