Explanation:
Þ Diamagnctism occurs in all materials.
Þ The Magnetic field of Induced magnetic moment is opposite to the applied field.
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Assertion : In all conductors, for studying the thermoelectric behaviour or metals, lead is taken as a reference metal.
Reason : In lead, the Thomson effect is negative.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
The maximum intensity in Young's double slit experiment is I0. Distance between the slits is d = 5 l, where l is the wavelength of monochromatic light used in the experiment. What will be the intensity of light in front of one of the slits on a screen at a distance D = 10d
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(a) |
(b) |
(c) |
(d) |
Two resistances are connected in two gaps of a metre bridge. The balance point is 20 cm from the zero end. A resistance of 15 ohms is connected in series with the smaller of the two. The null point shifts to 40 cm. The value of the smaller resistance in ohms is
|
(a) 3 |
(b) 6 |
(c) 9 |
(d) 12 |
When the P end of P-N junction is connected to the negative terminal of the battery and the N end to the positive terminal of the battery, then the P-N junction behaves like
|
(a) A conductor |
(b) An insulator |
(c) A super-conductor |
(d) A semi-conductor |
TV waves have a wavelength range of 1-10 meter. Their frequency range in MHz is
| (a) 30-300 | (b) 3-30 | (c) 300-3000 | (d) 3-3000 |
Material A has critical angle 
and material B has critical angle 
. Then which of the following is true
(i) Light can be totally internally reflected when it passes from B to A
(ii) Light can be totally internally reflected when it passes from A to B
(iii) Critical angle for total internal reflection is 
(iv) Critical angle between A and B is 
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(a) (i) and (iii) |
(b) (i) and (iv) |
(c) (ii) and (iii) |
(d) (ii) and (iv) |
Consider an electron in the nth orbit of a hydrogen atom in the Bohr model. The circumference of the orbit can be expressed in terms of the de Broglie wavelength λ of that electron as
|
(a) (0.259)n λ |
(b) |
(c) (13.6) λ |
(d) n λ |
