Lenz's law of electromagnetic induction corresponds to the
law of conservation of charge
law of conservation of energy
law of conservation of momentum
law of conservation of angular momentum
A thin wire of resistance 4Ω is bent to form a circle. The resistance across any diameter is
4 Ω
2 Ω
1 Ω
8 Ω
A battery of e.m.f. E and internal resistance r is connected to an external resistance R the condition for maximum power transfer is
r < R
r > R
r = 1/R
r = R
D.
r = R
The ionisation potential of hydrogen atom is -13.6 eV. An electron in the ground state of a hydrogen atoms absorbs a photon of energy 12.75 eV. How many different spectral line can one expect when the electron make a downward transition ?
1
4
2
6
The refractive indices of glass and quartz w.r.t. air are 3/2 and 12/5 respectively. The refractive index of quartz w.r.t. glass is
8/5
5/8
5/18
18/5
The radius of curvature of concave mirror is 24 cm and the image is magnified by 1.5 times. The object distance is
20 cm
8 cm
16 cm
24 cm
A point source of light is kept at a depth of h in water of refractive index 4/ 3. The radius of the circle at the surface of water through which light emits is
Which of the following statement is correct ?
The rest mass of a stable nucleus is less than the sum of the rest masses of its separated nucleons.
The rest mass of a stable nucleus is greater than the sum of the rest masses of its separated nucleons.
In nuclear fission, energy is released by fusion two nuclei of medium mass (approximately 1O0 amu).
In nuclear fission, energy is released by fragmentation of a very low nucleus.
A Si and a Ge diode has identical physical dimensions. The band gap in Si is larger than that in Ge. An identical reverse bias is applied across the diodes
The reverse current in Ge is larger than that in Si
The reverse current in Si is larger than that in Ge
The reverse current is identical in the two diodes
The relative magnitude of the reverse currents cannot be determined from the given data only