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CBSE Class 12 Physics Practice Paper: Set-VII

Nov 17, 2015 18:38 IST

    Find CBSE Class 12 Physics Practice Paper (Set-VII). This paper contains important questions from 7th unit (Dual Nature of Matter and Radiation) of physics. These questions will not only help the students to prepare for exams in a better manner, but will also help them in understanding the depth with which a topic should be studied.

    Few sample questions from the Question Paper are given below:

    Q. Why is wave nature of matter not more apparent to our daily observations? Is there any difference between light waves and matter waves?

    Q. In a plot of photoelectric current versus anode potential, how does

    (i) Saturation current vary with anode potential for incident radiations of different frequencies but same intensity?

    (ii) The stopping potential varies for incident radiations of different intensities but same frequency?

    (iii) Photoelectric current vary for different but same frequency of incident radiations?

    Q. With a labelled diagram explain the experimental study of the photoelectric effect. Which of the following phenomenon shows particle and wave nature of light: Diffraction, Photoelectric effect, Interference, Polarisation, Dispersion, Scattering.

    Q. In an experiment of the photoelectric effect using a semiconductor, Ram plotted graphs for different observation between photoelectric current and anode potential but her friend Shyam has to help him in plotting the correct graph. Shyam suggested repeating the experiment 3 times to get the correct result. Ram followed Shyam's instruction to get accurate readings.

    a) What values were displayed Ram and Shyam.

    b) Do non-metal shows photoelectric effect.

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