Electric Charges and Fields — Physics STD 12 Science — Question

The diffraction effect can be observed in(a) Only sound waves(b) Only light waves(c) Only ultrasonic waves (d) Sound as well as light waves

Assertion  :   Electrons move away from a low potential to high potential region.
Reason      : Because electrons has negative charge(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.

There are seven orbitals in a subshell then the value of l for it will be:

Angular  width (b) of central maximum of a diffraction pattern on a single slit does not depend upon(a) Distance between slit and source(b) Wavelength of light used(c) Width of the slit(d) Frequency of light used

A man runs towards mirror at a speed of 15 m/s. What is the speed of his image(a) 7.5 m/s(b) 15 m/s(c) 30 m/s(d) 45 m/s

The potential difference between the two plates of a parallel plate capacitor is constant. When air between the plates is replaced by dielectric material, the electric field intensity:

The rise of a liquid in a capillary tube depends on

1. The material.
2. The length.
3. The outer radius.
4. The inner radius of the tube.

4 bulbs marked 40 W, 250 V are connected in series with 250 V mains. The total power is(a) 10 W (b) 40 W(c) 320 W(d) 160 W

An oscillator is producing FM waves of frequency 2 kHz with a variation of 10 kHz. What is the modulating index(a) 0.20(b) 5.0(c) 0.67(d) 1.5