- APramagnetic materials only.
- BDiamagnetic materials only.
- CFerromagnetic materials only.
- DParamagnetic and ferromagnetic materials.
Explanation:
The magnetic susceptibility is negative for diamagnetic materials only.
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Light energy emitted by stars is due to
|
(a) Breaking of nuclei |
(b) Joining of nuclei |
|
(c) Burning of nuclei |
(d) Reflection of solar light |
Resistance of a voltameter is 2Ω, it is connected in series to a battery of 10 V through a resistance of 3Ω. In a certain time mass deposited on cathode is 1 gm. Now the voltameter and the 3Ω resistance are connected in parallel with the battery. Increase in the deposited mass on cathode in the same time will be
|
(a) 0 |
(b) 1.5 gm |
(c) 2.5 gm |
(d) 2 gm |
A parallel monochromatic beam of light is incident normally on a narrow slit. A diffraction pattern is formed on a screen placed perpendicular to the direction of incident beam. At the first maximum of the diffraction pattern the phase difference between the rays coming from the edges of the slit is
|
(a) 0 |
(b) |
(c) |
(d) 2 |
In which radioactive disintegration, neutron dissociates into proton and electron
|
(a) |
(b) β - emission |
(c) γ - emission |
(d) Positron emission |
If the focal length of a double convex lens for red light is its focal length for the violet light is
|
(a) |
(b) Greater than |
(c) Less than |
(d) |