Physics Test 3 General Science Aptitude
Physics Test 3 General Science Aptitude
Question 11
The ray with high penetrating power is_____?
Gamma (γ) rays have the highest penetrating power among common radiation types, even passing through metals.
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Question 12
The penetration of x-rays through an object depends upon the object's_____?
X-ray penetration is inversely related to the density of the object. Denser objects absorb more x-rays.
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Question 13
To find the hidden secrets under the water, the ships and submarines use the_____?
Sonar (Sound Navigation and Ranging) is used to detect underwater objects by reflecting sound waves.
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Question 14
Recording of brain waves from outer surface of head is called______?
Electroencephalography (EEG) records electrical activity (brain waves) from the scalp surface.
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Question 15
Ball bearings are used in cycles, scooters to _____?
Ball bearings reduce friction between the axle and wheel by converting sliding friction into rolling friction.
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Question 16
Steel is more elastic than rubber because______?
Elasticity is measured by Young's modulus (stress/strain). Steel has a much higher modulus, making it more elastic than rubber.
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Question 17
What does make the blood look red?
Hemoglobin, a protein in red blood cells, contains iron that binds oxygen and gives blood its red color.
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Question 18
In railway tracks, a small gap is left between the rails______?
Gaps in railway tracks allow for thermal expansion of metal rails, preventing bending or buckling in hot weather.
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Question 19
Friction can be reduced by changing over from_____?
Rolling friction is much less than sliding friction. That is why wheels and ball bearings are used.
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Question 20
Ice blocks are covered with sawdust_______?
Sawdust acts as an insulating layer, reducing heat transfer and preventing ice from melting quickly.
