Physics-Objective Related Question Answers
1001. The colour of light obtained by mixing of any two primary colour of light is?
Secondary colour
1002. Whose theory is called the Quantum theory of light?
Max Planck’s theory
1003. Why lightning is observed earlier than the thunder is heard?
Because light travels faster than sound
1004. A photoelectric cell converts?
Light energy into electric energy
1005. Tyndall effect is due to?
Brownian Motion
1006. If a surface absorbs all colours, it sees as?
Black
1007. If a surface reflects all colours, it sees as?
White
1008. Mirage is formed by?
Refraction and total internal reflection
1009. Why is the sky and sea blue in colour?
Due to the scattering of light
1010. The formation of rainbow is due to which phenomenon of light?
Refraction and dispersion
1011. The colour seen on the outer edge of the rainbow is?
Red
1012. Which colour is obtained when blue light and green light of the same intensities are mixed together?
Cyan
1013. The rays which appears to originate outside the earth?
the cosmic rays
1014. In a doctor’s stethescope the sound is intensified because of?
reflection of sound
1015. When sunlight passes through atmosphere, the colour which scatters most is?
Violet
1016. What is called interference?
The modification of intensity in the region of superimposition.
1017. Who suggested the wave theory of light?
Christian Huygens
1018. What is the name of the scientist who suggested that the velocity of light is maximum while propagating through vacuum?
Focault
1019. The intensity of light depends on?
Amplitude
1020. What is the reason for the formation if beautiful colours on a soap bubble or on a thin film of oil when spread over water?
Interference
1021. Who put forward the theory of electromagnetic radiation?
Maxwell
1022. Who discovered the photoelectric effect?
Heinrich Hertz
1023. What is the velocity of light in vacuum?
3 × 108 m/sec.
1024. Bending or spreading of light around tiny opaque objects are called?
Diffraction
1025. Which always reduces the velocity of electromagnetic waves?
Medium
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