Wave Optics — Physics STD 12 Science — Question

Two H atoms in the ground state collide inelastically. The maximum amount by which their combined kinetic energy is reduced is:

Isoclinic lines are the lines joining places with:

Two metal spheres of capacitance   and  carry some charges. They are put in contact and then separated. The final charges  and   on them will satisfy

(a)

(b)

(c)

(d)

If the net electric flux through a closed surface is zero, then we can infer:

A parallel plate capacitor with air as medium between the plates has a capacitance of 10 μF. The area of capacitor is divided into two equal halves and filled with two media as shown in the figure having dielectric constant  and . The capacitance of the system will now be

(a) 10 μF

(b) 20 μF

(c) 30 μF

(d) 40 μF

A galvanometer of resistance 20 W is to be converted into an ammeter of range 1 A.  If a current of 1 mA produces full scale deflection, the shunt required for the purpose is

(a) 0.01 W

(b) 0.05 W

(c) 0.02 W

(d) 0.04 W

In the diagram shown, the reading of voltmeter is 20 V and that of ammeter is 4 A. The value of R should be (Consider given ammeter and voltmeter are not ideal)

(a) Equal to 5Ω

(b) Greater from 5 Ω

(c) Less than 5 Ω

(d) Greater or less than 5 Ω  depends on the material of R

When Ge crystals are doped with phosphorus atom, then it becomes

(a) Insulator

(b) P-type

(c) N-type

(d) Superconductor

The central fringe obtained in the diffraction pattern of a single slit is :