- ACopper, hydrogen, silver.
- BCopper, hydrogen, argon.
- CHydrogen, oxygen, argon.
- DCopper, silver, oxygen.
Explanation:
Diamagnetic substances are those which are freebly repelled by the magnetic field.
$\therefore$ Copper, Hydrogen, Silver are diamagnetic as their atoms have net magnetic dipole moment zero.
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A current of 1.5 A flows through a copper voltameter. The thickness of copper deposited on the electrode surface of area
in 20 minutes will be (Density of copper = 9000
and E.C.E. of copper = 0.00033 g/C)
|
(a) 2.6 |
(b) 2.6 |
(c) 1.3 |
(d) 1.3 |
Angle of a prism is 30° and its refractive index is and one of the surface is silvered. At what angle of incidence, a ray should be incident on one surface so that after reflection from the silvered surface, it retraces its path
|
(a) 30° |
(b) 60° |
(c) 45° |
(d) |
Crystal structure of NaCl is
|
(a) Fcc |
(b) Bcc |
(c) Both of the above |
(d) None of the above |
The electric field between the two spheres of a charged spherical condenser
|
(a) Is zero |
(b) Is constant |
|
(c) Increases with distance from the centre |
(d) Decreases with distance from the centre |
Assertion : Base in a transistor is made very thin as compared to collector and emitter regions.
Reason : Due to thin base power gain and voltage gain is obtained by a transistor.
|
(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 the assertion and reason both are false. |