Atoms — Physics STD 12 Science — Question

The splitting of line into groups under the effect of electric or magnetic field is called

(a) Zeeman's effect	(b) Bohr's effect
(c) Heisenberg's effect	(d) Magnetic effect

A galvanometer of 25 W resistance can read a maximum current of 6mA.  It can be used as a voltmeter to measure a maximum of 6 V by connecting a resistance to the galvanometer.  Identify the correct choice in the given answers

(a) 1025 W in series

(b) 1025 W in parallel

(c) 975 W in series

(d) 975 W in parallel

A block A kept on an inclined surface just begins to slide if the inclination is 30°. The block is replaced by another block B and it is found that it just begins to slide if the inclination is 40°:

1. Mass of A > mass of B.
2. Mass of A < mass of B.
3. Mass of A = mass of B.
4. All the three are possible.

Which of the following statements is false?

In LCR series AC circuit.

If the plates of a parallel plate charged capacitor are not parallel, the interface charge density is:

Two coils P and Q are lying parallels and very close to each other. Coil P is connected to an AC source whereas Q is connected to a sensitive galvanometer. On pressing key K.

A particle moving in a magnetic field increases its velocity, then its radius of the circle

(a) Decreases

(b) Increases

(c) Remains the same

(d) Becomes half

A proton and a deutron both having the same kinetic energy, enter perpendicularly into a uniform magnetic field B. For motion of proton and deutron on circular path of radius   and   respectively, the correct statement is

(a)

(b)

(c)

(d)

When a magnetic substance is heated, then it

(a) Becomes a strong magnet	(b) Losses its magnetism
(c) Does not effect the magnetism	(d) Either (a) or (c)