Two electrolytic cells containing 
and 
respectively are connected in series and a current is passed through them until 1 mg of copper is deposited in the first cell. The amount of silver deposited in the second cell during this time is approximately [Atomic weights of copper and silver are respectively 63.57 and 107.88]
|
(a) 1.7 mg |
(b) 3.4 mg |
(c) 5.1 mg |
(d) 6.8 mg |
(b) 3.4 mg
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Assertion : NOT gate is also called inverter circuit.
Reason : NOT gate inverts the input order.
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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. |
In a hypothetical Bohr hydrogen, the mass of the electron is doubled. The energy 
and the radius 
of the first orbit will be (
is the Bohr radius)
|
(a) |
(b) |
|
(c) |
(d) |
A biconvex lens of glass having refractive index 1.47 is immersed in a liquid. It becomes invisible and behaves as a plane glass plate. The refractive index of the liquid is:
The magnetic field at the centre of a circular coil of radius r is π times that due to a long straight wire at a distance r from it, for equal currents. Figure here shows three cases : in all cases the circular part has radius r and straight ones are infinitely long. For same current the B field at the centre P in cases 1, 2, 3 have the ratio
|
(a) |
(b) |
|
(c) - |
(d) |
The electromagnetic waves do not transport
| (a) Energy | (b) Charge | (c) Momentum | (d) Information |
Figure shows three points A, B and C in a region of uniform electric field 
. The line AB is perpendicular and BC is parallel to the field lines. Then which of the following holds good. Where 
and 
represent the electric potential at points A, B and C respectively
|
(a) |
(b) |
(c) |
(d) |
