Explanation:
The magnetic susceptibility of diamagnetic materials doesn’t depend upon temperature. This is often because there’s an outsized barrier between the bottom state and therefore the excited states of diamagnetic substances. Hence, it remains constant during the change of temperature. All the other statements are false.
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Radioactivity was discovered by
|
(a) Becquerel |
(b) Pierre Curie |
(c) Roentgen |
(d) Rutherford |
In a lossless transformer an alternating current of 2 amp is flowing in the primary coil. The number of turns in the primary and secondary coils are 100 and 20 respectively. The value of the current in the secondary coil is
|
(a) 0.08 A |
(b) 0.4 A |
(c) 5 A |
(d) 10 A |
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 |
If the ionisation potential of helium atom is 24.6 volt, the energy required to ionise it will be
|
(a) 24.6 eV |
(b) 24.6 V |
(c) 13.6 V |
(d) 13.6 eV |
When a light wave goes from air into water, the quality that remains unchanged is its
|
(a) Speed |
(b) Amplitude |
(c) Frequency |
(d) Wavelength |
An electron moving towards the east enters a magnetic field directed towards the north. The force on the electron will be directed
|
(a) Vertically upward |
(b) Vertically downward |
|
(c) Towards the west |
(d) Towards the south |
Ultraviolet radiations of 6.2eV falls on an aluminium surface (work function 4.2 eV). The kinetic energy in joules of the fastest electron emitted is approximately
|
(a) 3.2 |
(b) 3.2 |
(c) 3.2 |
(d) 3.2 |
