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

The grid in a triode valve is used(a) To increases the thermionic emission(b) To control the plate to cathode current(c) To reduce the inter-electrode capacity(d) To keep cathode at constant potential

In which disintegration out of the following disintegration atomic number decreases ?

The capacity of a parallel plate capacitor with no dielectric substance but with a separation of 0.4 cm is  2 μF. The separation is reduced to half and it is filled with a dielectric substance of value 2.8. The final capacity of the capacitor is(a) 11.2 μF(b) 15.6 μF(c) 19.2 μF(d) 22. 4 μF

If an α-particle collides head-on with a nucleus, what is its impact parameter?

In an insulator, the forbidden energy gap between the valence band and conduction band is of the order of:

In Young’s double slit experiment, distance between two sources is 0.1 mm. The distance of screen from the sources is 20 cm. Wavelength of light used is 5460 Å. Then angular position of the first dark fringe is (a) 0.08°(b) 0.16°(c) 0.20°  (d) 0.313°

Resistance of tungsten wire at 150℃  is 133 Ω . Its resistance temperature coefficient is 0.0045/℃. The resistance of this wire at 500 ℃  will be(a) 180 Ω(b) 225 Ω(c) 258 Ω(d) 317 Ω

The band gap in Germanium and silicon in eV respectively is(a) 0.7, 1.1(b) 1.1, 0.7(c) 1.1, 0 (d) 0, 1.1

A 5cm long solenoid having 10 ohm resistance and 5mH inductance is joined to a 10V battery. At steady state, the current through the solenoid (in ampere) will be.