CBSE Class 12 Physics Daily Practice Questions 18 October 2023

CBSE Class 12 Physics Daily Practice Questions 18 October 2023: For Science stream students, Physics is a mandatory subject. Although a majority of the students find it difficult to score well in this subject. However, if you plan accordingly, it might give you better scores. It is required to give attention to Physics daily and practice the previous years’ questions from each chapter every day to manage the time. We have shared the CBSE Class 12 Physics Practice Questions with sample physics problems in each category. Give a try to these problems that have been taken out from CBSE Class 12 Physics Previous Years’ Question papers. 

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CBSE Class 12 Physics Daily Practice Questions 18 October 2023

Check out the daily practice questions for 18 October 2023 here as per their sections/question-types: 

Section A: Multiple-Choice Questions

A semiconductor device is connected in series with a battery, an ammeter and a resisitor. A current flows in the circuit. If the polarity of the battery is reversed, the current in the circuit almost becomes zero. The device is a/an
(a) intrinsic semiconductor
(c) n-type semiconductor
(b) p-type semiconductor
(d) p-n junction diode

Section B: Very Short Answer Type Question

What happens to the interference pattern when two coherent sources are
(a) infinitely close, and
(b) far apart from each other

Section C: Short Answer Type Question

(i) Distinguish between nuclear fission and fusion giving an example of each.
(ii) Explain the release of energy in nuclear fission and fusion on the basis of binding energy per nucleon curve.

Section D: Long Answer Type Question

(i) Draw a labelled ray diagram showing the image formation by a refracting telescope. Define its magnifying power. Write two limitations of a refracting telescope over a reflecting telescope.
(ii) The focal lengths of the objective and the eye-piece of a compound microscope are 1.0 cm and 2.5 cm respectively. Find the tube length of the microscope for obtaining a magnification of 300.

Section E: Case-Based Question

(a) Figure shows the variation of photoelectric current measured in a photo cell circuit as a function of the potential difference between the plates of the photo cell when light beams A, B, C and D of different wavelengths are incident on the photo cell. Examine the given figure and answer the following questions:

(i) Which light beam has the highest frequency and why?
(ii) Which light beam has the longest wavelength and why?
(iii) Which light beam ejects photoelectrons with momentum and why? maximum
OR
(b) What is the effect on threshold frequency and stopping potential on increasing the frequency of incident beam of light? Justify your answer.

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