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Physics Practice Questions Set 3
For India's Top Government Exams
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A diffraction pattern is obtained using a beam of red light. Which one among the following will be the outcome, if the red light is replaced by blue light?
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1 point
Bands disappear
The diffraction pattern becomes broader and further apart
The diffraction pattern becomes narrower and crowded together
No change
Raw mangoes shrivel when pick
l
ed in brine. The phenomenon is associated with ___
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1 point
osmosis
reverse osmosis
increase of surface tension of the fluid
decrease of surface tension of the fluid
Which one of the following is not the result of surface tension?
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1 point
Vapor formation above the liquid surface
The convex shape of the liquid meniscus
Liquid rising in a capillary
The spherical shape of mercury fell on the floor
The most familiar form of radiant energy in sunlight that causes tanning and sunburning of human skin, is called
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1 point
ultraviolet radiation
visible radiation
infrared radiation
microwave radiation
Consider the following statements
1. Clear sky appears blue due to poor scattering of the blue wavelength of visible light.
2. Red part of light shows more scattering than blue light in the atmosphere.
3. In the absence of atmosphere, there would be no scattering of light and the sky will look black.
Which of the statements given above is/are correct?
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1 point
Only 1
1 and 2
Only 3
All of these
Which one of the following statements is true?
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1 point
Temperatures differing 25° on the Fahrenheit (F) scale must differ by 45° on the Celsius (C) scale
0℉ corresponds to – 32℃
Temperatures that differ by 10° on the Celsius scale must differ by 18° on the Fahrenheit scale
Water at 90℃ is warmer than water at 202℉
The apparent weight of a steel sphere immersed in various liquids is measured using a spring balance. The greatest reading is obtained for the liquid
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1 point
having the smallest density
having the largest density
in which the sphere was submerged deepest
having the greatest volume
The hair of a shaving brush cling together when the brush is removed from water due to __
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1 point
viscosity
surface tension
friction
elasticity
A boy throws four stones of the same shape, size, and weight with the equal speed at different initial angles with the horizontal line. If the angles are 15°, 30°, 45°, and 60°, at which angle the stone will cover the maximum horizontally?
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1 point
15°
30°
45°
60°
Fat can be separated from milk in a cream separation because of ___
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1 point
cohesive force
gravitational force
centrifugal force
centripetal force
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