# Class 12 Physics Important Questions

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Class 12 Physics Important Questions- In this article we will provide you ten important Physics questions, which will help you in your class 12 board exams and other entrance exams

NCERT Solutions for Class 12 Physics

Class 12 Physics Important Questions is very important resource for students preparing for Class XII board Examination. Question from very important topics are covered here for NCERT Class 12. You will also get idea about the type of questions, you can expect in your Class 12th examination.

Here you can get Class 12 Important Questions Physics based on NCERT Text book for Class XII. Physics Class 12 Important Questions are very helpful to score high marks in board exams. Here we have covered Important Questions on all topics for Class 12 Physics subject.

Important Questions for Class 12 are must do question suggested by NCERT.

CBSE Sample Papers for Class 12 2018

## Class 12 Important Questions for Physics

1. A double convex lens of glass of refractive index 1.5 has its both surfaces of equal radius of curvature of 20 cm each. An object of height 5 cm is placed at a distance of 15 cm from the lens. Calculate size of image formed.
2. A converging lens has a focal length of 23 cm in air. It is made of a material of refractive index 1.5. It is immersed in a liquid of refractive index 1.2. Calculate its new focal length.
3. Distinguish the magnetic properties of dia, para and ferromagnetic substances in term of:
• Susceptibility
• Magnetic permeability
• Coercivity

Give an example of each of these materials. Draw the field lines due to an external magnetic field near a (a) diamagnetic (b) Paramagnetic substance.

4. Raman’s Father bought a new flat in a multistory One day he went to visit the building and flat. There, he found that there is no provision for preventing the damage caused by lighting. He told about it to his father. They meet to the secretary of the building society and explained them about lightning strike. Raman told them the method to protect building from lightning.
• What values were displayed by Raman?
• Explain the method to protect building from lightning.
5.  Draw a labelled circuit diagram of a moving coil galvanometer. Prove that in a radial magnetic field, the deflection of the coil is directly proportional to the current flowing in the coil.
6. Draw a labelled circuit diagram of a cyclotron. Explain briefly how it works and how it is used to accelerate the charged particle.
• Show that time period of ions in cyclotron is independent both the speed and radius of the circular path.
• Show that cyclotron frequency is independent of energy of particle.
7. What is meant by r.m.s. value of a.c. and e.m.f. ? derive an expression for r.m.s value of alternating current (a.c.) and electromotive force (e.m.f.)
8. An a.c. source of voltage V = Vo sin ωt is connected one by one to three circuit elements X,Y and Z. It is observed that the current flowing in them:
• is in phase with the applied voltage for element X.
• lags the applied voltage, in phase by π/2 for element Y.
• leads the applied voltage, in phase by π/2 for element Z.

Identify the three circuit elements.Find an expression for the (a) current flowing in the circuit, (b) net impedance of the circuit, when the same a.c. source is connected across a series combination of the elements X,Y and Z.

If the frequency of the applied voltage is varied, set up the condition of the frequency when the current amplitude in the circuit is maximum. Write the expression for this current amplitude.

9. Draw a ray diagram to show the working of a astronomical telescope. Deduce an expression for total magnification when  the final image is formed at (a) least distance of distinct vision, (b) infinity
10. (a) Trace the rays of light showing the formation of an image due to a point object placed on the axis of a spherical surface separating the two media of refracting indices m1 and m2. (b) Establish the relation between the distance of the object, image radius of curvature from the central point of the spherical surface. Hence derive the expression for the lens maker’s formula.

CBSE 2017 Solved Question Papers for Class 12

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