ISC (Science) ISC Class 12 - CISCE Important Questions for Physics (Theory)

Write two important advantages of reflecting telescope over a refracting telescope.

Give the truth table and circuit symbol for NAND gate

Draw the circuit diagram of a full wave rectifier. Explain its working showing its input and output waveforms.

Identify the part of the electromagnetic spectrum which is suitable for radar system used in aircraft navigation.

Draw a labelled ray diagram showing the formation of a final image by a compound microscope at least distance of distinct vision

State de Broglie hypothesis

State how a moving coil galvanometer can be converted into an ammeter.

What is mass defect?

Draw the circuit diagram of a full wave rectifier.

An electric dipole of dipole moment `vecP` is placed in a uniform electric field `vecE` with its axis inclined to the field. Write an expression for the torque `vecT` experienced by the dipole in vector form. Show diagrammatically how the dipole should be kept in the electric field so that the torque acting on it is:

1. maximum
2. Zero

Obtain an expression for equivalent capacitance when three capacitors C₁, C₂ and C₃ are connected in series.

Draw a labelled circuit diagram of a potentiometer to measure the internal resistance ‘r’ of a cell. Write the working formula (derivation is not required). 

For a metallic conductor, what is the relation between current density (J), conductivity (σ) and electric field intensity (E)?

What is motional emf? State any two factors on which it depends.

How are electric vector `(vec "E")`, magnetic vector `(vec "B")` and velocity vector `(vec "C")` oriented in an electromagnetic wave?

Derive Snell’s law on the basis of Huygen’s wave theory when the light is travelling from a denser to a rarer medium.

Find the de Broglie wavelength of electrons moving with a speed of 7 × 10⁶ ms ^-1. 

What are matter waves?

On the basis of Bohr's theory, derive an expression for the radius of the n^th orbit of an electron of the hydrogen atom.

Write one balanced equation to show Nuclear fission