- Astraight
- Bcircle
- Crectangular hyperbola
- Dparabola

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The minimum energy required to excite a hydrogen atom from its ground state is
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(a) 13.6 eV |
(b) -13.6 eV |
(c) 3.4 eV |
(d) 10.2 eV |
A potentiometer has uniform potential gradient across it. Two cells connected in series (i) to support each other and (ii) to oppose each other are balanced over 6m and 2m respectively on the potentiometer wire. The e.m.f.’s of the cells are in the ratio of
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(a) 1 : 2 |
(b) 1 : 1 |
(c) 3 : 1 |
(d) 2 : 1 |
The figure shows a graph between ln
and ln|n|, where
is the area enclosed by the nth orbit in a hydrogen like atom. The correct curve is

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(a) 4 |
(b) 3 |
(c) 2 |
(d) 1 |
The graph Shows the variation in magnetic flux ∅(t) with time through a coil. Which of the statements given below is not correct

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(a) There is a change in the direction as well as magnitude of the induced emf between B and D |
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(b) The magnitude of the induced emf is maximum between B and C |
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(c)There is a change in the direction as well as magnitude of induced emf between A and C |
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(d) The induced emf is zero at B |
Two magnets A and B are identical in mass, length and breadth but have different magnetic moments. In a vibration magnetometer, if the time period of B is twice the time period of A. The ratio of the magnetic moments
of the magnets will be
| (a) 1/2 | (b) 2 | (c) 4 | (d) 1/4 |
Assertion : The electrical conductivity of earth’s atmosphere decrease with altitude.
Reason : The high energy particles (i.e. g-rays and cosmic rays) coming from outer space and entering our earth’s atmosphere causes ionisation of the atoms of the gases present there and the pressure of gases decreases with increase in altitude.
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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 assertion is false but reason is true. |