Physics – Important Question Bank for CBSE Class XII (HSC) Board Exam 2017

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After the tremendous success of our last year Important Questions Bank HSC (12th Std) Board Exam 2016, we have also created a list of Most Important Questions Bank for CBSE Class XII (HSC) Board Exam 2017 which are likely to appear in HSC Board Exams this year.

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Q1. Define capacitor reactance. Write its S.I. units?

Q2. How are side bands produced?

Q3. Draw the logic symbol for NAND gate and give its Truth Table?

Q4. Distinguish between amplitude modulation and frequency modulation.

Q5. What is the electric flux through a cube of side 1 cm which encloses an electric dipole?

Q6. Show that the radius of the orbit in hydrogen atom varies as n(square), where n is the principal quantum number of the atom.

Q7. Distinguish between ‘intrinsic’ and ‘extrinsic’ semiconductors.

Q8. A proton and a α-particle have the same de-Broglie wavelength. Determine the ratio of
(i) their accelerating potentials
(ii) their speeds.

Q9. Find an expression for the intensity of transmitted light when a polaroid sheet is rotated between two crossed polaroids. In which position of the polaroid sheet will the transmitted intensity be maximum?

Q10. A group of students while coming from the school noticed a box marked “Danger H.T. 2200 V” at a substation in the main street. They did not understand the utility of a such a high voltage while they argued, the supply was only 220 V. They asked their teacher this question the next day. The teacher thought it to be an important question and,
therefore, explained to the whole class.
Answer the following questions:
(i) What device is used to bring the high voltage down to the low voltage of a.c. current
and what is the principle of its working?
(ii) Is it possible to use this device for bringing down the high dc voltage to the low
voltage? Explain.
(iii) Write the values displayed by the students and the teacher.

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Important Questions Bank for CBSE Class XII (HSC) Board Exam 2017

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