The manifestation of band structure in solids is due to
Heisenberg's uncertainly principle
Pauli's exclusion principle
Bob's correspondence principle
Boltzmann's law
If there were no gravity, which of the following will not be there for a fluid ?
Viscosity
Surface tension
Pressure
Archimedes' upward thrust
For the stationary wave
The distance between a node and the next antinode is
7.5 cm
15 cm
22.5 cm
30 cm
An electric heater of resistance 6 Ω works for 10 min on a 60 V line. The energy liberated in this period of time is
7.2 × 103 J
3.6 × 105 J
43.2 × 104 J
28.8 × 104 J
B.
3.6 × 105 J
A circular coil has 500 turn of wire and its radius is 5 cm. The self inductance of the coil is
25 x 10-3 mH
25 mH
50 x 10-3 H
50 x 10-3 mH
The diameter of each plate of an air capacitor is 4 cm. To make the capacity of this plate capacitor equal to that of 20 cm diameter sphere, the distance between the plates will be
4 × 10-3 m
1 × 10-3 m
1 cm
1 × 10-3 cm
The electric potential V is given as a function of distance x (m) by V = (5x2 + 10x − 9) volt. Value of electric field at x=l m is
20 V/m
6 V/m
11 V/m
− 23 V/m
Shown below is a distribution of charges. The flux of electric field due to these charges through the surface is
zero