CBSE Class 12 Physics Boards Question Paper 2018 Set 02 Solved

CBSE Class 12 Physics Boards Question Paper Solved 2018 Set 2. Students can download the last year question papers using the link below. Free download of examination question papers with solutions. Last 10 year question papers should be practised to get better marks in examinations.

PHYSICS

SECTION -A

1. Draw graphs showing variation of photoelectric current with applied voltage for two incident radiations of equal frequency and different intensities. Mark the graph for the radiation of higher intensity.

2. A proton and an electron travelling along parallel paths enter a region of uniform magnetic field, acting perpendicular to their paths. Which of them will move in a circular path with higher frequency ?

3. Four nuclei of an element undergo fusion to form a heavier nucleus, with release of energy. Which of the two-the parent or the daughter nucleus-would have higher binding energy per nucleon ?

4. Which mode of propagation is used by short wave broadcast services ?

5. Name the electromagnetic radiations used for (a) water purification, and (b) eye surgery.

SECTION-B

6. (a) Why are infra-red waves often called heat waves ? Explain.

(b) What do you understand by the statement, ‘‘Electromagnetic waves transport momentum’’ ?

7. Two electric bulbs P and Q have their resistances in the ratio of 1 : 2. They are connected in series across a battery. Find the ratio of the power dissipation in these bulbs.

8. If light of wavelength 412·5 nm is incident on each of the metals given below, which ones will show photoelectric emission and why ?

9. A carrier wave of peak voltage 15 V is used to transmit a message signal. Find the peak voltage of the modulating signal in order to have a modulation index of 60%. 

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