HSC Science Class 12 - Tamil Nadu Board of Secondary Education Question Bank Solutions

Two cells each of 5V are connected in series across an 8Ω resistor and three parallel resistors of 4Ω, 6Ω, and 12Ω. Draw a circuit diagram for the above arrangement. Calculate

1. the current drawn from the cell
2. current through each resistor

A circular coil of radius 5 cm and 50 turns carries a current of 3 ampere. The magnetic dipole moment of the coil is nearly

A thin insulated wire forms a plane spiral of N = 100 tight turns carrying a current 1 = 8 m A (milli ampere). The radii of inside and outside turns are a = 50 mm and b = 100 mm respectively. The magnetic induction at the center of the spiral is

Three wires of equal lengths are bent in the form of loops. One of the loops is circle, another is a semi-circle and the third one is a square. They are placed in a uniform magnetic field and same electric current is passed through them. Which of the following loop configuration will experience greater torque?

Define magnetic dipole moment.

State Coulomb’s inverse law.

Calculate the magnetic field at a point on the axial line of a bar magnet.

Obtain the magnetic induction at a point on the equatorial line of a bar magnet. Magnetic field at a point along the equatorial line due to a magnetic dipole (bar magnet).

How is Eddy current produced? How do they flow in a conductor?

Give the uses of Foucault current.

Explain the types of emission spectrum.

Two point white dots are 1 mm apart on a black paper. They are viewed by eye of pupil diameter 3 mm approximately. The maximum distance at which these dots can be resolved by the eye is, [take wavelength of light, λ = 500 nm]

State the laws of reflection.

State the law of refraction.

Prove laws of reflection using Huygens’ principle.

Prove laws of refraction using Huygens’ principle.

The charge of cathode rays is ______.

What are cathode rays?

Write the properties of cathode rays.

When a metallic surface is illuminated with radiation of wavelength λ, the stopping potential is V. If the same surface is illuminated with radiation of wavelength 2λ, the stopping potential is `"V"/4`. The threshold wavelength for the metallic surface is