Alternating Current — Physics STD 12 Science — Question

Which of the following quantities increase when wavelength is increased? Consider only the magnitudes.

Assertion   :   Two electric bulbs of 50 and 100 W are given. When connected in series 50 W bulb glows more but when connected parallel 100 W bulb glows more. 
Reason      : In series combination, power is directly proportional to the resistance of circuit. But in parallel combination, power is inversely proportional to the resistance of the circuit.(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.

If a ray of light goes from a rarer medium to a denser medium, will it bend towards the normal or away from it?

There is some liquid in a closed bottle. The amount of liquid remains constant as time passes. The vapour in the remaining part:

1. Must be saturated.
2. Must be unsaturated.
3. May be unsaturated.
4. There will be no vapour.

The following configuration of gate is equivalent to

Speed of electromagnetic waves is the same:

1. For all wavelengths.
2. In all media.
3. For all intensities.
4. For all frequencies.

The angle which subtends the periphery of the spherical mirror at the centre of curvature is called:

Wavelength of which series in hydrogen spectrum lies in visible region ?

Two similar coils are kept mutually perpendicular such that their centres coincide. At the centre, find the ratio of the magnetic field due to one coil and the resultant magnetic field by both coils, if the same current is  flown