Physics-Objective Related Question Answers
976. Materials which do not pass light through them are called?
Opaque
977. All colours are reflected by a?
white object
978. All colours are absorbed by a?
black object
979. We see lightning first and hear the thunder later because of?
velocity of light is greater than the velocity of sound
980. The primary colours are?
red; blue and green
981. Optical fibre works on the principle of?
total internal reflection
982. The velocity of light is maximum in?
vacuum
983. If a flower illuminated by white light reflects red and blue colours, the colour of the flower will be?
Magenta
984. The splitting up of a composite light into its component colours is called?
Dispersion
985. Dispersion occurs due to the difference in?
Wavelength
986. Any light which is composed of more than one colour is named as?
Composite light
987. Irregular and partial reflection of light during its passing through a medium is known as?
Scattering
988. The colour produced by the mixing of green and red is?
Yellow
989. A green leaf appears green because?
it reflects green colour
990. The beautiful colour of the soap foam and oil spread water is due to?
interference of light
991. How does a green leaf appears when it is viewed in a blue light?
Dark
992. The colour used in signal lamp is?
Red
993. The colour of the head lamp in motor vehicles is?
Yellow
994. The heat carried in the solar rays is?
Infrared radiation
995. Sun burn is caused by which radiation?
Ultraviolet
996. At a place when green, red and blue rays overlap, which colour will be seen?
White
997. The distribution of the component colours of a composite light in the order of their wavelength or frequency as a result of dispersion is called?
Spectrum
998. When wavelength increases the rate of scattering?
Decreases
999. The property of certain material by virtue of which they absorb light of shorter wavelength and emit light of longer wavelength is called?
Fluorescence
1000. Why can we see pictures with natural effect on a television?
Due to persistance of vision
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