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In a transistor configuration b-parameter is
|
(a) |
(b) |
(c) 
|
(d) 
|
The speed of an electron having a wavelength of 
is
|
(a) 7.25 × |
(b) 6.26 × |
(c) 5.25 × |
(d) 4.24 × |
If the current 30 A flowing in the primary coil is made zero in 0.1 sec. The emf induced in the secondary coil is 1.5 volt. The mutual inductance between the coil is
|
(a) 0.05 H |
(b) 1.05 H |
(c) 0.1 H |
(d) 0.2 H |
A coil of area 80 square cm and 50 turns is rotating with 2000 revolutions per minute about an axis perpendicular to a magnetic field of 0.05 Tesla. The maximum value of the e.m.f. developed in it is
|
(a) 200π volt |
(b) |
(c) |
(d) |
A convex lens forms a real image of an object for its two different positions on a screen. If height of the image in both the cases be 8 cm and 2 cm, then height of the object is
|
(a) 16 cm |
(b) 8 cm |
(c) 4 cm |
(d) 2 cm |
A metallic block has no potential difference applied across it, then the mean velocity of free electrons is T = absolute temperature of the block)
|
(a) Proportional to T |
(b) Proportional to |
|
(c) Zero |
(d) Finite but independent of temperature |
