Moving Charges and Magnetism — Physics STD 12 Science — Question

Peak value of applied alternating voltage in a LR cir- cuit is 5 V. If magnitude of maximum voltage across the ends of resistor is 3 V. then maximum value of voltage across the inductor is

What type of lens from the following would you have in your magnifying lens to read a page in small print?

Isotopes of same element exists in nature.How they differ from each other? 

Penetrating power of X-rays can be increased by(a) Increasing the potential difference between anode and cathode(b) Decreasing the potential difference between anode and cathode(c) Increasing the cathode filament current(d) Decreasing the cathode filament current

A capacitor acts as an infinite resistance for:

1. DC.
2. AC.
3. DC as well as AC.
4. Neither AC nor DC.

Whenever a hydrogen atom emits a photon in the Balmer series(a) It need not emit any more photon(b) It may emit another photon in the Paschen series(c) It must emit another photon in the Lyman series(d) It may emit another photon in the Balmer series

When unpolarised light beam is incident from air onto glass (n = 1.5) at the polarising angle(a) Reflected beam is polarised 100 percent(b) Reflected and refracted beams are partially polarised(c) The reason for (a) is that almost all the light is reflected(d) All of the above

When two deuterium nuclei fuse together to form a tritium nuclei, we get a(a) Neutron(b) Deutron(c) α - particle(d) Proton