QuestionKart - Questions

cds- Question :

Consider the following statements :
1. Clear sky appears blue due to poor scattering of 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 sky will look black.
Which of the statements given above is/are correct?

A :

1 only

B :

1 and 2 only

C :

3 only

D :

1,2 and 3

cds- Question :

Consider the following statement
1. A person with myopia distant object distinctly but cannot see nearby object clearly.
2. A person with hypermetropia cannot see distinct objects clearly
3. A person with presbyopia cannot see nearby objects without correctly glasses

which of the statements given aboove is/are not correct?

A :

1, 2 and 3

B :

1 and 2

C :

2 and 3

D :

3 only

cds- Question :

a diffraction pattern is obtained using a beam of red light which among the following will be the outcome if the red light is replaced by blue light

A :

bands disappear

B :

diffraction pattern becomes broader and further apart

C :

diffraction pattern becomes narrower and crowded together

D :

no change

cds- Question :

the black board seems black because it

A :

reflects every color

B :

does not reflect any color

C :

absorbs black color

D :

reflects black color

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