Physics

CBSE Class 12

Practice to excel and get familiar with the paper pattern and the type of questions. Check you answers with answer keys provided.

Download the PDF Sample Papers Free for off line practice and view the Solutions online.

Advertisement

Advertisement

2.
What is the electric flux through a cube of side 1 cm which encloses an electric dipole?

2873 Views

3.

Graph showing the variation of current versus voltage for a material GaAs is shown in the figure. Identify the region of

i) negative resistance

ii) where Ohm’s law is obeyed. 1878 Views

4.
Use Kirchhoff’s rules to obtain conditions for the balance condition in a Wheatstone bridge.

6021 Views

Advertisement

5.

Name the parts of the electromagnetic spectrum which is

(a) suitable for radar systems used in aircraft navigation.

(b) used to treat muscular strain.

(c) used as a diagnostic tool in medicine.

Write in brief, how these waves can be produced. 2197 Views

6.

A cell of emf ‘E’ and internal resistance ‘r’ is connected across a variable load resistor R. Draw the plots of the terminal voltage V versus

(i) R and

(ii) the current I.

5271 Views

7.

Two capacitors of unknown capacitances C_{1} and C_{2} are connected first in series and then in parallel across a battery of 100 V. If the energy stored in the two combinations is 0.045 J and 0.25 J respectively, determine the value of C_{1} and C_{2}. Also, calculate the charge on each capacitor in parallel combination.

4147 Views

8.
_{1} in series with the coil. If a resistance R_{2} is connected in series with it, then it can measure upto V/2 volts. Find the resistance, in terms of R_{1} and R_{2}, required to be connected to convert it into a voltmeter that can read upto 2 V. Also find the resistance G of the galvanometer in terms of R_{1} and R_{2}.

State the principle of working of a galvanometer.

A galvanometer of resistance G is converted into a voltmeter to measure upto V volts by connecting a resistance R 3152 Views

Advertisement

9.
_{C} = X_{L} is inserted in series in the circuit. Justify your answer in each case.

An inductor L of inductance X_{L }is connected in series with a bulb B and an ac source.

1895 Views

10.
A concave lens of refractive index 1.5 is immersed in a medium of refractive index 1.65. What is the nature of the lens ?

2072 Views

Advertisement

Textbook Solutions | Additional Questions