Atoms — Physics STD 12 Science — Question

The capacity of a spherical conductor is 1.0 µF. Its radius will be :

The number of protons in an atom of atomic number Z and mass number A is:

A nucleus is bombarded with a high speed neutron so that resulting nucleus is a radioactive one. This phenomenon is called(a) Artificial radioactivity(b) Fusion(c) Fission(d) Radioactivity

Bonds in semiconductors are :

In an oscillating system, a restoring force is a must. In an L-C circuit, the restoring force is provided by a/ an.

Two wires of the same material are given. The first wire is twice as long as the second and has twice the diameter of the second. The resistance of the first will be(a) Twice of the second(b) Half of the second(c) Equal to the second(d) Four times of the second

The far point of a myopia eye is at 40 cm. For removing this defect, the power of lens required will be(a) 40 D   (b) – 4  D(c)  – 2.5 D(d)   0.25 D

Characteristic X-rays are produced due to (a) Transfer of momentum in collision of electrons with target atoms(b) Transition of electrons from higher to lower electronic orbits in an atom(c) Heating of the target(d) Transfer of energy in collision of electrons with atoms in the target

What do you understand by the static or frictional electricity?