MODEL PAPER 1 — Physics STD 12 Science — Question

Two cars of unequal masses use similar tyres. If they are moving at the same initial speed, the minimum stopping distance:

Assertion  :   An N-type semiconductor has a large number of electrons but still it is electrically neutral.
Reason     : An N-type semiconductor is obtained by doping an intrinsic semiconductor with a pentavalent impurity.(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.(c) If assertion is true but reason is false.(d) If the assertion and reason both are false.

A long, straight wire carries a current along the z-axis, One can find two points in the x−yplane such that:

1. The magnetic fields are equal.
2. The directions of the magnetic fields are the same.
3. The magnitudes of the magnetic fields are equal.
4. The field at one point is opposite to that at the other point.

A positive point charge Q is brought near an isolated metal cube.

. A surface that has the same electrostatic potential at every point on it is known as _____________.

The potential difference in open circuit for a cell is 2.2 volts. When a 4 ohm resistor is connected between its two electrodes the potential difference becomes 2 volts. The internal resistance of the cell will be(a) 1 ohm(b) 0.2 ohm(c) 2.5 ohm(d) 0.4 ohm

When white light passes through the achromatic combination of prisms, then what is observed (a) Only deviation(b) Only dispersion(c) Deviation and dispersion(d) None of the above