Current Electricity — Physics STD 12 Science — Question

In the Young’s double slit experiment, for which colour the fringe width is least(a) Red   (b) Green(c) Blue   (d) Yellow

The binding energy per nucleon of iron atom is approximately.

When a piece of a ferromagnetic substance is put in a uniform magnetic field, the flux density inside it is four times the flux density away from the piece. The magnetic permeability of the material is(a) 1(b) 2(c) 3(d) 4

Assertion  :   For a perfectly diamagnetic substance permeability is always one.
Reason       : The ability of a material of permit the passage of magnetic lines of force through it is called magnetic permeability.(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 assertion is false but reason is true.

Radioactive nuclei that are injected into a patient collect at certain sites within its body, undergoing radioactive decay and emitting electromagnetic radiation. These radiations can then be recorded by a detector. This procedure provides an important diagnostic tool called(a) Gamma camera(b) CAT scan(c) Radiotracer technique(d) Gamma ray spectroscopy

The interior of a conductor can have no excess ____ in the static situation.

When a slab of dielectric material is introduced between the parallel plates of  a capacitor which remains connected to a battery, then charge on  plates relative to earlier charge(a) Is less(b) Is same(c) Is more(d) May be less or more depending on the nature of the material introduced

The mass of the electron varies with(a) The size of the cathode ray tube(b) The variation of ‘g’(c) Velocity(d) Size of the electron

X-rays are(a) Stream of electrons(b) Stream of positively charged particles(c) Electromagnetic radiations of high frequency(d) Stream of uncharged particles