Practice Test

Q1) The white light is a mixture of ___ colours. Show Answer

Q2) Sunlight is predominately a mixture of ___ visible colours. Show Answer

Q3) The effect of the glass prism is only to separate the seven colours of Show Answer

Q4) The ___ colour is at the top and ___ colour is at the bottom of the spectrum. Show Answer

Q5) Who discovered by his experiments with glass prisms that white light consists of seven colours ? Show Answer

Q6) The light which refracts most while passing through a prism is Show Answer

Q7) Which of the following colour of light undergoes the least deviation while passing through a glass prism ? Show Answer

Q8) Which of the following source of light is different from others ? Show Answer

Q9) The wavelength of light is expressed in Show Answer

Q10) The combination of red light and blue light is Show Answer

Q11) Which of the following colours is scattered minimum ? Show Answer

Q12) Blue colour of sky is due to Show Answer

Q13) The colour of a star is an indication of its Show Answer

Q14) A prism splits a beam of white light into its constituent colours. This is so because ___ of different colours is different. Show Answer

Q15) The astronaut in the spaceship sees the sky as Show Answer

Q16) A red glass in white light appears Show Answer

Q17) A red flower when seen through a green filter appears Show Answer

Q18) A red rose appears red in Show Answer

Q19) A red rose appears ___ in the green light. Show Answer

Q20) Human beings cannot see Show Answer

Q21) The velocity of electromagnetic wave in vacuum is Show Answer

Q22) The colour of light corresponds to its Show Answer

Q23) A transparent body which allows light of only certain colours to pass through it is called a Show Answer

Q24) Under normal conditions, the colour of the sky at noon is Show Answer

Q25) In a prism, light undergoes ___ at the two slant surfaces. Show Answer

Q26) In case of a rectangular glass block the refraction of light takes place at two parallel surfaces, hence there is no Show Answer

Q27) The band of seven colours formed when white light passes through the prism is called Show Answer

Q28) Light wavelength visible to the human eye is Show Answer

Q29) Newton's colour disc can be used to demonstrate that light Show Answer

Q30) When Newton's colour disc is rotated fast, the different colours Show Answer

Q31) When a ray passes through a prism. Show Answer

Q32) At a particular minimum value of angle of deviation, the prism is under Show Answer

Q33) At a particular minimum value of angle of deviation, the refracted ray becomes Show Answer

Q34) The angle between two plane refracting surfaces of the prism is called the angle of Show Answer

Q35) A transparent refracting material which is bounded by two plane refracting surfaces is known as a Show Answer

Q36) The ratio of real depth to apparent depth is called the Show Answer

Q37) The spectrum in which the colours are separated using a narrow source of light, is called Show Answer

Q38) Which of the following colour of light undergoes the maximum deviation while passing through a glass prism ? Show Answer

Q39) Which of the following figures correctly represents the passage of white light through a prism ? Show Answer

Q40) Which of the following is correct when a monochromatic light passes through a prism ? Show Answer

Q41) Two identical prisms PQR and P'Q'R' are given. Which of their following placement will yield maximum dispersion ? Show Answer

Q42) Which of the following figures correctly shows the bending of a monochromatic light inside the prism ? Show Answer

Q43) When a graph is plotted taking angle of incidence (i) along the X- axis, which of the following figures correctly represent this variation ? Show Answer

Q44) In which of the following cases will no dispersion take place when sunlight passes through it ? Show Answer

Q45) The blue colour of the sky can be attributed to Show Answer

Q46) In designing a direct vision spectroscope,care is taken that Show Answer

Q47) A beam of monochromatic is passing from one medium to another. Which one of the following quantities does not change ? Show Answer

Q48) An astronaut in the earth satellite will observe sky as Show Answer

Q49) White light while passing through a glass prism breaks up into light of different colours because Show Answer

Q50) yellow colour light is used as fog light because yellow colour Show Answer

Q51) The light energy escaping from the sun can be spread by
Show Answer

Q52) When a beam of white light passes through a glass prism, the colour of light beam that deviates the least is
Show Answer

Q53) Two convex lenses with power 2 D are kept in contact with each other. The focal length of the combined lens system is Show Answer

Q54) Concave mirror is used in headlights of vehicles, because it
Show Answer

Q55) A rainbow is produced due to which one of the following phenomena?
Show Answer

Q56) Colour vision in human eyes is the function of photoreceptor cells named
Show Answer

Q57) Which one of the following statements is correct?
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Q58) The sun is observed to be reddish when it is near the horizon, ie, in the morning and the evening. This is because
Show Answer

Q59) Which one of the following processes explains the splitting of a beam of white light into its constituent colours? Show Answer