Magnetism and Matter — Physics STD 12 Science — Question

A solid is completely immersed in a liquid. The force exerted by the liquid on the solid will.

1. Increase if it is pushed deeper inside the liquid.
2. Change if its orientation is changed.
3. Decrease if it is taken partially out bf the liquid.
4. Be in the vertically upward direction.

Two circular coils can be arranged in any of the three situations shown in the figure. Their mutual inductance will be.

Which of the following radiations has the least wavelength(a) g -rays(b) b-rays(c) a-rays(d) X-rays

Which gates is represented by this figure

The V-i graph for a conductor makes an angle θ with V-axis. Here V denotes the voltage and i denotes current. The resistance of conductor is given by(a) sin θ(b) cos θ(c) tan θ (d) cot θ

Interference was observed in interference chamber when air was present, now the chamber is evacuated and if the same light is used, a careful observer will see(a) No interference(b) Interference with bright bands(c) Interference with dark bands(d) Interference in which width of the fringe will be slightly increased

Which of the following statement is correct(a) Liquids obey fully the ohm's law(b) Liquids obey partially the ohm's law(c) There is no relation between current and p.d. for liquids(d) None of the above

If refractive index of red, violet and yellow lights are 1.42, 1.62 and 1.50 respectively for a medium. Its dispersive power will be(a) 0.4(b) 0.3(c) 0.2(d) 0.1

A small rod of bismuth is suspended freely between the poles of a strong electromagnet. It is found to arrange itself at right angles to the magnetic field. This observation establishes that bismuth is(a) Diamagnetic(b) Paramagnetic(c) Ferri-magnetic(d) Antiferro-magnetic

Source of Sun's energy is (a) Burning of hydrogen(b) Fission reactions involving hydrogen(c) Fusion reactions involving hydrogen(d) Some other source