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

Is there any difference between coloured light obtained from prism and colours of soap bubble?

An unpolarised light of intensity 32 Wm^-2 passes through three Polaroids such that the axes of the first and the last Polaroids are at 90°. What is the angle between the axes of the first and middle Polaroids so that the emerging light has an intensity of only 3 Wm^-2?

The reflected light is found to be plane polarised when an unpolarized light falls on a denser medium at 60° with the normal. Find the angle of refraction and critical angle of incidence for total internal reflection in the denser to rarer medium reflection.

What is an integrated circuit?

State and prove De Morgan’s first and second theorem.

Write a short note on ‘electrostatic shielding’.

What is polarisation?

What is dielectric strength?

Discuss the various properties of conductors in electrostatic equilibrium.

Explain the process of electrostatic induction.

Explain dielectrics in detail and how an electric field is induced inside a dielectric.

An electron and a proton are allowed to fall through the separation between the plates of a parallel plate capacitor of voltage 5 V and separation distance h = 1 mm as shown in the figure.

1. Calculate the time of flight for both electron and proton.
2. Suppose if a neutron is allowed to fall, what is the time of flight?
3. Among the three, which one will reach the bottom first?

(Take m_p = 1.6 x 10^-27 kg, m_e= 9.1 x 10^-31 kg and g = 10 m s^-2)

State Biot-Savart’s law.

How is a galvanometer converted into

1. an ammeter and
2. a voltmeter?

Deduce the relation for the magnetic induction at a point due to an infinitely long straight conductor carrying current.

Obtain a relation for the magnetic induction at a point along the axis of a circular coil carrying current.

What is tangent law? Discuss in detail.

Discuss the conversion of galvanometer into an ammeter and also a voltmeter.

What is meant by wattles current?

Give any one definition of power factor.