Nuclei — Physics STD 12 Science — Question

In a Young's double slit experiment, the source is white light. One of the holes is covered by a red filter and another by a blue filter. In this case:

Which of the following is not the property of a cathode ray

(a) It casts shadow	(b) It produces heating effect
(c) It produces flurosence	(d) It does not deflect in electric field

The value of amplification factor from the following graph will be

(a) 10

(b) 50

(c) 25

(d) 40

According to Einstein’s photoelectric equation, the plot of the kinetic energy of the emitted photo electrons from a metal Vs the frequency of the incident radiation gives as straight the whose slope?

A house is served by 220 V supply line in a circuit protected by a 9 ampere fuse. The maximum number of 60 W lamps in parallel that can be turned on, is

(a) 44

(b) 20

(c) 22

(d) 33

Every atom makes one free electron in copper. If 1.1 ampere current is flowing in the wire of copper having 1 mm diameter, then the drift velocity (approx.) will be (Density of copper  = 9   and atomic weight = 63)

(a) 0.3 mm/sec

(b) 0.1 mm/sec

(c) 0.2 mm/sec

(d) 0.2 mm/sec

Atoms of an element differing in mass though possessing the same chemical properties are called :

A semi conductor device with both active and passive electronic elements diffused into a silicon water to form a functional circuit is called.

An incandescent filament emits a spectrum which is: