- AOrder of colours is reverse
- BOrder of colours is irregular
- CColours are overlapped
- DNo colours is present
Explanation:
The order of colours is are straight, hence option a is false.
Order of colours are regular.
Colours are overlapped each other in impure spectrum.
Colours are present in impure spectrum.
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Consider the circuits shown in the figure. Both the circuits are taking same current from battery but current through R in the second circuit is th of current through R in the first circuit. If R is 11 W, the value of R1
|
(a) 9.9 W |
(b) 11 W |
(c) 8.8 W |
(d) 7.7 W |
A metal rod of length 2 m is rotating with an angular velocity of 100 rad/sec in a plane perpendicular to a uniform magnetic field of 0.3 T. The potential difference between the ends of the rod is
|
(a) 30 V |
(b) 40 V |
(c) 60 V |
(d) 600 V |
absorbs an energetic neutron and emits beta particles. The resulting nucleus is
|
(a) |
(b) |
(c) |
(d) |
Two long conductors, separated by a distance d carry current I1 and I2 in the same direction. They exert a force F on each other. Now the current in one of them is increased to two times and its directions is reversed. The distance is also increased to 3d. The new value of the force between them is
|
(a) –2F |
(b) F/3 |
(c) 2F/3 |
(d) – F/3 |
The binding energy per nucleon is maximum in the case of
|
(a) |
(b) |
(c) |
(d) |
Assertion : Density of all the nuclei is same.
Reason : Radius of nucleus is directly proportional to the cube root of mass number.
|
(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. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |