Atoms — Physics STD 12 Science — Question

In Young's interference experiment, if the slits are of unequal width, then:

An alternating current having peak value 14A is used to heat a metal wire. To produce the same heating effect, a constant current i can be used where i is:

In given figure, the potentiometer wire AB has a resistance of 5 W and length 10 m. The balancing length AM for the emf of 0.4 V is

(a) 0.4 m

(b) 4 m

(c) 0.8 m

(d) 8 m

Which of the following properties shows that light is a transverse wave?

A particle moves with a constant velocity parallel to the X-axis. Its angular momentum with respect to the origin:

1. Is zero.
2. Remains constant.
3. Goes on Increasing.
4. Goes on decreasing.

In Young's double slit experiment, the phase difference between the light waves reaching third bright fringe from the central fringe will be (λ =6000 Å )

(a) Zero

(b) 2π

(c) 4 π

(d) 6 π

Choose the correct statement about the properties of magnetic lines of forces.

Two electric bulbs A and B are rated as 60 W and 100 W. They are connected in parallel to the same source. Then,

(a) Both draw the same current

(b) A draws more current than B

(c) B draws more current than A

(d) Current drawn are in the ratio of their resistances

In the given figure, when key k is closed, then direction of induced current in the coil B IS:

The current through a 4.6 H inductor is shown in the following graph. The induced emf during the time interval t = 5 milli-sec to 6 milli-sec will be

(a) 103 V

(b) – 23 × 103 V

(c) 23 × 103 V

(d) Zero