Moving Charges and Magnetism — Physics STD 12 Science — Question

Photoelectric effect was explained by :

Complete the following statements with an appropriate word/ term be filled in the blank space(s).
The force of attraction or repulsion between two charges is given by ......................

Atomic number of a nucleus is Z and atomic mass is M. The number of neutron is(a) M - Z(b) M(c) Z  (d) M + Z

Two bulbs each marked 100 W, 220 V are connected in series across 220 V supply. The power consumed by them, when lit, is

The current sensitibility of a moving coil galanometer increases with decrease in:

Assertion :  Electron has higher mobility than hole in a semiconductor.
Reason     : Mass of electron is less than the mass of hole. (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.

The tangent galvanometer, when connected in series with a standard resistance can be used as(a) An ammeter(b) A voltmeter(c) A wattmeter(d) Both an ammeter and a voltmeter

A double slit experiment is performed with light of wavelength 500 nm. A thin film of thickness 2 mm and refractive index 1.5 is introduced in the path of the upper beam. The location of the central maximum will(a) Remain unshifted(b) Shift downward by nearly two fringes(c) Shift upward by nearly two fringes(d) Shift downward by 10 fringes