- AMetals
- BFerro-magnetic materials
- CNon-metals
- DDia-magnetic materials
Explanation:
The substances which are attracted towards a magnet are called ferro-magnetic materials Materials that can be magnetized, which are also the ones that are strongly attracted to a magnet, are called ferromagnetic (or ferrimagnetic). These include iron, nickel, cobalt, some alloys of rare-earth metals, and some naturally occurring minerals such as lodestone.

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Assertion : In the process of photoelectric emission, all the emitted photoelectrons have the same kinetic energy.
Reason : The photon transfers its whole energy to the electron of the atom in photoelectric effect.
|
(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. |
Two particles X and Y having equal charges, after being accelerated through the same potential difference, enter a region of uniform magnetic field and describes circular path of radius and
respectively. The ratio of mass of X to that of Y is
|
(a) |
(b) |
(c) |
(d) |
Assertion : Penetrating power of X-rays increases with the increasing the wavelength.
Reason : The penetrating power of X-rays increases with the frequency of X-rays.
|
(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. |
The brightness of a bulb will be reduced, if a resistance is connected in
|
(a) Series with it |
(b) Parallel with it |
|
(c) Series or parallel with it |
(d) Brightness of the bulb cannot be reduced |
The correct curve between the magnetic induction (B) along the axis of a long solenoid due to current flow i in it and distance x from one end is
|
(a) |
(b) |
(c) |
(d) |