Atoms — Physics STD 12 Science — Question

The spectrum of light emitted by a glowing solid is(a) Continuous spectrum(b) Line spectrum(c) Band spectrum(d) Absorption spectrum

An ammeter of 5 ohm resistance can read 5 mA. If it is to be used to read 100 volts, how much resistance is to be connected in series(a) 19.9995 Ω(b) 199.995 Ω(c) 1999.95 Ω(d) 19995 Ω

Assertion   :   When a magnet is brought near iron nails, only translatory force act on it.
Reason      : The field due to a magnet is generally uniform.(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.

Dimension of magnetic field is :

Assertion : The comet do not obey Kepler's laws of planetary motion
Reason     :  The comet do not have elliptical orbit(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.

Resistivity of a wire depends on:

The magnifying power of a microscope with an objective of 5 mm focal length is 400. The length of its tube is 20 cm. Then the focal length of the eye-piece is (a) 200 cm(b) 160 cm  (c) 2.5 cm(d)  0.1 cm  

The self inductance of a motor of an electric fan is 10H. In order to impart maximum power at 50Hz, it should be connected to a capacitance of: