Electromagnetic Induction — Physics STD 12 Science — Question

The force which makes magnet move:

One plate of parallel plate capacitor is smaller than other, then charge on smaller plate will be(a) Less than other(b) More than other(c) Equal to other(d) Will depend upon the medium between them

The ripple factor in a half wave rectifier is(a) 1.21(b) 0.48(c) 0.6(d) None of these

A watch glass containing some powdered substance is placed between the pole pieces of a magnet. Deep concavity is observed at the centre. The substance in the watch glass is:

Four charges are kept at the corner points of a square. The net force on a charge kept at the center of the square is _________?

For a given plate-voltage, the plate current in a triode is maximum when the potential of(a) The grid is positive and plate is negative(b) The grid is positive and plate is positive(c) The grid is zero and plate is positive(d) The grid is negative and plate is positive

Einstein's mass-energy relation is :

The force between unlike charges is:

In the given circuit, if A and B represent two inputs and C represents the output, the circuit represents:

The molar heat capacity of oxygen gas at STP is nearly 2.5R. As the temperature is increased, it gradually increases and approaches 3.5R. The most appropriate reason for this behaviour is that at high temperatures:

1. Oxygen does not behave as an ideal gas.
2. Oxygen molecules dissociate in atoms.
3. The molecules collide more frequently.
4. Molecular vibrations gradually become effective.