HSC Science कक्षा १२ - Tamil Nadu Board of Secondary Education Question Bank Solutions for Physics

Obtain the condition for bridge balance in Wheatstone’s bridge.

Explain the determination of unknown resistance using meter bridge.

How the emf of two cells are compared using potentiometer?

Lightning is a very good example of a natural current. In typical lightning, there is 10⁹ J energy transfer across the potential difference of 5 × 10⁷ V during a time interval of 0.2 s. Using this information, estimate the following quantities:

1. the total amount of charge transferred between cloud and ground
2. the current in the lightning bolt
3. the power delivered in 0.2 s.

A copper wire of 10^-6 m² area of cross-section, carries a current of 2 A. If the number of electrons per cubic meter is 8 × 10²⁸, calculate the current density and average drift velocity.

A potentiometer wire has a length of 4 m and resistance of 20 Ω. It is connected in series with resistance of 2980 Ω and a cell of emf 4 V. Calculate the potential along the wire.

In a potentiometer arrangement, a cell of emf 1.25 V gives a balance point at 35 cm length of the wire. If the cell is replaced by another cell and the balance point shifts to 63 cm, what is the emf of the second cell?

In a Young’s double-slit experiment, the slit separation is doubled. To maintain the same fringe spacing on the screen, the screen-to-slit distance D must be changed to ______.

One of Young’s double slits is covered with a glass plate as shown in figure. The position of central maximum will,

What is interference of light?

What is phase of a wave?

Obtain the relation between phase difference and path difference.

What is intensity (or) amplitude division?

How does wavefront division provide coherent sources?

How do source and images behave as coherent sources?

What is a bandwidth of interference pattern?

Derive the mirror equation and the equation for lateral magnification.

Derive the equation for refraction at a single spherical surface.

Obtain the equation for resultant intensity due to interference of light.

Explain Young’s double-slit experimental setup and obtain the equation for path difference.