1 . The chemical which is used in art and craft and can cause anemia and leukemia is —
A.  Benzene
B.  Dioxine
C.  Phthalate
D.  Aldrin
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2 . What are the signals that inf orm the operating system that some activity has taken place, called —
A.  Informers
B.  Interrupts
C.  Events
D.  Handlers
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3 . A stone is dropped from the roof of a house towards the ground. The kinetic energy of the stone will be maximum :
A.  just after it is dropped
B.  when it is just on the half-way
C.  just before it touches the ground
D.  when it touches the ground
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4 . Which acid is stored in batteries ?
A.  Sulphuric acid
B.  Nitric acid
C.  Hydrochloric acid
D.  Acetic acid
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5 . The inert gas which is substituted for nitrogen in the air used by deep sea divers for Breathing is :
A.  Neon
B.  Argon
C.  Krypton
D.  Helium
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6 . Who invented aeroplane ?
A.  Orville Wright and Wilbur Wright
B.  Sir Frank Whittle
C.  Michael Faraday
D.  Christian Huygens
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7 . Hydraul i c machi nes work under the Principle on —
A.  Newton’s Law
B.  Joules Law
C.  Pascal’s Law
D.  Floatation Law
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8 . Air bladder in fish acts as :
A.  Accessory respiratory organ
B.  Hydrostatic organ
C.  Both accessory respiratory organ and hydrostatic organ
D.  Primary respiratory organ
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9 . For a ray of light to suffer total internal reflection it has to pass from —
A.  glass to water
B.  water to glass
C.  air to water
D.  air to glass
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10 . Lime water is kept in the air, it turns milky due to presence of ______
A.  Carbondioxide
B.  Nitrogen
C.  Oxygen
D.  Sulphurdioxide
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