Physics Test 1 General Science Aptitude
Physics Test 1 General Science Aptitude
Question 11
Which gas is commonly used in balloons and airships?
Helium is preferred as it is lighter than air and non-flammable, unlike hydrogen.
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Question 12
A slow-running pendulum clock can be speeded up by_____?
The time period of a pendulum is proportional to the square root of its length. Reducing length decreases time period, speeding the clock.
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Question 13
A man is standing on a weighing machine in a lift which is moving. The weighing machine will show MINIMUM reading when, the lift is moving_____?
In free fall, the normal reaction force becomes zero. Thus, the weighing machine shows minimum reading (zero).
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Question 14
The approximate intensity level of the sound which can caused damage to the ear drum is_____?
Sounds beyond 100 dB can damage hearing. At around 160 dB, the eardrum may rupture instantly.
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Question 15
Fuse wire is made of_____?
Fuse wire is made of an alloy of 63% tin and 37% lead, which has a low melting point to protect circuits.
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Question 16
Which one of the following is the main culprit in the thinning of Ozone layer in the earth's stratosphere?
CFCs release chlorine atoms in the stratosphere, which destroy ozone molecules.
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Question 17
Steering of a car involves_____?
Car steering works on the principle of a couple—two equal and opposite forces applied at different points.
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Question 18
The property by virtue of which metals can be beaten into thin sheets is known as_____?
Malleability refers to the ability of a metal to be hammered or rolled into thin sheets.
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Question 19
The sky appears blue because the earth's atmosphere_____?
Shorter wavelengths like blue are scattered more by air molecules, making the sky appear blue.
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Question 20
The most abundant element in Earth's crust is_____?
Oxygen is the most abundant element in Earth's crust, forming about 47% by weight.
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