Question : White clothes are cooler than black ones because they:
Option 1: absorb all the light that reaches them
Option 2: reflect all the light that reaches them
Option 3: will not allow the light to penetrate
Option 4: cool the sunlight completely
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Correct Answer: reflect all the light that reaches them
Solution : The correct option is reflect all the light that reaches them.
In bright sunlight, white clothing seems cooler than black because it reflects more of the sunlight than black clothing. A considerable fraction of the sunlight is reflected away from the body by white fabric, limiting the amount of heat absorbed. Contrarily, black clothing absorbs more sunlight, raising the body's temperature and making one feel warmer.
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Question : White light is an example of:
Option 1: LASER light
Option 2: Plane polarised light
Option 3: Monochromatic light
Option 4: Polychromatic light
Question : A black body can absorb radiations of:
Option 1: lower wavelengths only
Option 2: intermediate wavelengths only
Option 3: higher wavelengths only
Option 4: all wavelengths
Question : A star appears twinkling in the sky because of :
Option 1: scattering of light by atmosphere
Option 2: reflection of light by atmosphere
Option 3: refraction of light by atmosphere
Option 4: diffraction of light by atmosphere
Question : Parts of the following sentence have been given as options. Select the option that contains an error.
Suman has bought a black and a white shawl to wear with her new dress.
Option 1: to wear with
Option 2: her new dress.
Option 3: a black and a white shawl
Option 4: Suman has bought
Question : Which one of the following is not a feature of the indifference curve?
Option 1: They do not intersect each other.
Option 2: They slope downwards to the light.
Option 3: They are parallel to each other.
Option 4: They are concave to each other.
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