Physics NCERT Exemplar Solutions Class 12th Chapter Twelve

The internal energy (U), pressure (P) and volume (V) of an ideal gas are related as U = 3PV + 4. The gas is

Two charged thin infinite plane sheets of uniform surface charge density ${\sigma }_{+}$ and ${\sigma }_{-}$ , where $\left|{\sigma }_{+}\right|>\left|{\sigma }_{-}\right|$ , intersect at right angle. Which of the following best represents the electric field lines for this system.

A small bar magnet is moved through a coil at constant speed from one end to the other. Which of the following series of observations will be seen on the galvanometer G attached across the coil?

Three positions shown describe:

(a) The magnet's entry

(b) Magnet is completely inside and

(c) Magnet's exit

Match the $C_p/C_V$ ratio for ideal gases with different type of molecules:

Match the correct option?

A two point charges $4q$ and $-q$ are fixed on the $x$ -axis at $x=-\frac{d}{2}$ and $x=\frac{d}{2}$ , respectively. If a third point charge ' $q$ ' is taken from the origin to $x=d$ along the semicircle as shown in the figure, the energy of the charge will:

Take the breakdown voltage of the zener diode used in the given circuit as $6\mathrm{V}$ . For the input voltage shown in figure below, the time variation of the output voltage is: (Graphs drawn are schematic and not to scale)

A Tennis ball is released from a height $h$ and after freely falling on a wooden floor it rebounds and reaches height $\frac{h}{2}$ . The velocity versus height of the ball during its motion may be represented graphically by:

(graphs are drawn schematically and on not to scale)

Perpendicular to the plane $ABC$ is $I_0$ . If part $ADE$ is removed, the moment of inertia of the remaining part about the same axis is $\frac{{\mathrm{N}\mathrm{I}}_0}{16}$ where $\mathrm{N}$ is an integer. Value of $\mathrm{N}$ is

A closed vessel contains 0.1 mole of a monatomic ideal gas at $200\mathrm{K}$ . If 0.05 mole of the same gas at $400\mathrm{K}$ is added to it, the final equilibrium temperature (in $\mathrm{K}$ ) of the gas in the vessel will be close to

For a transverse wave traveling along a straight line, the distance between two peaks (crests) is 5
 , while the distance between one crest and one trough is 1.5 m. The possible wavelengths (in $\mathrm{A}\to \mathrm{I}\mathrm{V};\mathrm{}\mathrm{B}\to \mathrm{I}$ ) of the waves are: