Explanation:
The false statement is Wheatstone bridge is susceptible to high dc current. It is actually not susceptible to high dc current and can give inaccurate readings if not balanced. The Wheatstone bridge measures resistance from few ohms tomega ohms.All the other statements are valid.
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In a semiconductor, the concentration of electrons is 8 
and that of the holes is 5
The semiconductor is
|
(a) P-type |
(b) N-type |
(c) Intrinsic |
(d) PNP-type |
A circular coil of radius 4 cm and of 20 turns carries a current of 3 amperes. It is placed in a magnetic field of intensity of 0.5 
. The magnetic dipole moment of the coil is
|
(a) 0.15 |
(b) 0.3 |
(c) 0.45 
|
(d) 0.6
|
When a charge of 3 coulombs is placed in a uniform electric field, it experiences a force of 3000 Newton. Within this field, potential difference between two points separated by a distance of 1 cm is
|
(a) 10 volts |
(b) 90 volts |
(c) 1000 volts |
(d) 3000 volts |
The inductance of a coil is 60μH. A current in this coil increases from 1.0 A to 1.5 A in 0.1 second. The magnitude of the induced e.m.f. is
|
(a) 60 |
(b) 300 |
(c) 30 |
(d) 3 |
In Young's experiment, the distance between the slits is reduced to half and the distance between the slit and screen is doubled, then the fringe width
|
(a) Will not change |
(b) Will become half |
|
(c) Will be doubled |
(d) Will become four times |
Line spectrum contains information about
|
(a) The atoms of the prism |
|
(b) The atoms of the source |
|
(c) The molecules of the source |
|
(d) The atoms as well as molecules of the source |
An electron moving with a speed u along the positive x-axis at y = 0 enters a region of uniform magnetic field 
which exists to the right of y-axis. The electron exits from the region after some time with the speed v at co-ordinate y, then
|
(a) v > u, y < 0 |
(b) v = u, y > 0 |
(c) v > u, y > 0 |
(d) v = u, y < 0 |
Consider the following two statements
A. Energy spectrum of a-particles emitted in radioactive decay is discrete
B. Energy spectrum of b-particles emitted in radioactive decay is continuous
|
(a) Only A is correct |
(b) Only B is correct |
|
(c) A is correct but B is wrong |
(d) Both A and B are correct |
