Two capacitors connected in parallel having the capacities 
and 
are given ‘q’ charge, which is distributed among them. The ratio of the charge on and will be
|
(a) |
(b) |
(c) |
(d) |
(a) 
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The relative permeability (
of a ferromagnetic substance varies with temperature (T) according to the curve
|
(a) A |
(b) B |
(c) C |
(d) D |
The time constant of an LR circuit represents the time in which the current in the circuit
|
(a) Reaches a value equal to about 37% of its final value |
|
(b) Reaches a value equal to about 63% of its final value |
|
(c) Attains a constant value |
|
(d) Attains 50% of the constant value |
Five lumen/watt is the luminous efficiency of a lamp and its luminous intensity is 35 candela. The power of the lamp is
|
(a) 80 W |
(b) 176 W |
(c) 88 W |
(d) 36 W |
The energy of a hydrogen atom in its ground state is -13.6eV. The energy of the level corresponding to the quantum number n = 2 (first excited state) in the hydrogen atom is
|
(a) – 2.72 eV |
(b) – 0.85 eV |
(c) – 0.54 eV |
(d) – 3.4 eV |
The distance between the plates of a parallel plate capacitor is d. A metal plate of thickness d/2 is placed between the plates. The capacitance would then be
|
(a) Unchanged |
(b) Halved |
(c) Zero |
(d) Doubled |
When white light passes through the achromatic combination of prisms, then what is observed
|
(a) Only deviation |
(b) Only dispersion |
|
(c) Deviation and dispersion |
(d) None of the above |
Two bar magnets with magnetic moments 2 M and M are fastened together at right angles to each other at their centres to form a crossed system, which can rotate freely about a vertical axis through the centre. The crossed system sets in earth’s magnetic field with magnet having magnetic moment 2M making and angle q with the magnetic meridian such that
|
(a) θ = |
(b) θ = |
(c) θ = |
(d) θ = |
Assertion : Light is produced in gases in the process of electric discharge through them at high pressure.
Reason : At high pressure electrons of gaseous atoms collide and reach and excited state.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(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. |
