Semiconductor Electronic: Material, Devices And Simple Circuits — Physics STD 12 Science — Question

The energy of a photon of characteristic X-rays from  a Coolidge tube comes from (a) The kinetic energy of the striking electron(b) The kinetic energy of the free electrons of the target(c) The kinetic energy of the ions of the target(d) An electronic transition of the target atom

Magnetic induction is a(a) Scalar quantity(b) Vector quantity(c) Both (a) and (b)(d) None of the above

Which decay increases the atomic number?

Which one of the series of hydrogen spectrum is in the visible region(a) Lyman series (b) Balmer series (c) Paschen series(d) Bracket series

Two magnets are held together in a vibration magnetometer and are allowed to oscillate in the earth's magnetic field with like poles together, 12 oscillations per minute are made but for unlike poles together only 4 oscillations per minute are executed. The ratio of their magnetic moments is(a) 3 : 1   (b) 1 : 3(c) 3 : 5    (d) 5 : 4

The light when enters the human eye experiences most of the refraction while passing through(a) Cornea  (b)  Aqueous humour  (c) Vitrous humour  (d)  Crystalline lens  

Two lines of force due to a bar magnet(a) Intersect at the neutral point(b) Intersect near the poles of the magnet(c) Intersect on the equatorial axis of the magnet(d) Do not intersect at all

The characteristic impedance of a coaxial cable is of the order of(a) 50 W  (b) 200 W(c) 270 W(d) None of these

Consider the diffraction patern for a small pinhole. As the size of the hole is increased:

Light is:

1. Wave phenomenon.
2. Particle phenomenon
3. Both particle and wave phenomenon.