ISC (Science) ISC Class 12 - CISCE Question Bank Solutions for Physics (Theory)

Write one balanced equation to show Nuclear fusion

Why nuclear fusion reaction is also called thermo-nuclear reaction?

Write one balanced reaction representing nuclear fusion.

In a nuclear reactor, what is the function of a moderator?

In our Nature, where is the nuclear fusion reaction taking place continuously?

A transformer is used to step up an alternating emf of 200V to 440V. If the primary coil has 1000 turns, calculate the number of turns in the secondary coil. 

An a.c generator generates an emf 'ε' where ε = 314 Sin (50πt) volt. Calculate the frequency of emf ε.

What is the turns ratio i.e., transformer ratio, n_s: n_p, in an ideal transformer which in-creases ac voltage from 220 V to 33000 V?

In an ideal transformer, an output of 66 kV is required when an input voltage of 220 V is available. If the primary has 300 turns, how many turns should the secondary have?

What is the ideal transformer? 

The primary coil of a transformer has 60 turns whereas its secondary coil has 3000 turns.

If a 220 V ac voltage is applied to the primary coil, how much emf is induced in the secondary coil?

The primary coil of a transformer has 60 turns whereas its secondary coil has 3000 turns.

If a current of 5A flows in the primary coil, how much current will flow in a load in the secondary coil? State the assumption you have made regarding the transformer, in this calculation.

What type of transformer is used in a mobile phone charger?

Explain why core of a transformer is always laminated.

Define critical angle for a given medium.

Name the principle on the basis of which optical fibres work.

Name any two phenomena which take place in the formation of a rainbow.

How will you convert a moving coil galvanometer into a voltmeter?

ε₁ and ε₂ are two batteries having emf of 34V and 10V respectively and internal resistance of 1Ω and 2Ω respectively. They are connected as shown in the figure below. Using Kirchhoff’s Laws of electrical networks, calculate the currents I₁ and I₂.

Why are the pole pieces of a horseshoe magnet in a moving coil galvanometer made cylinder in shape?