For a crystal system, a = b = c, a = b = g ¹ 90o, the system is
|
(a) Tetragonal system |
(b) Cubic system |
|
(c) Orthorhombic system |
(d) Rhombohedral system |
(d) Rhombohedral system
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A straight conductor carries a current of 5A. An electron travelling with a speed of 5 
parallel to the wire at a distance of 0.1m from the conductor, experiences a force of
|
(a) 8 |
(b) 3.2 |
(c) 8 |
(d) 1.6 |
Assertion : The coil is bound over the metallic frame in moving coil galvanometer.
Reason : The metallic frame help in making steady deflection without any oscillation.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
In charging a battery of motor-car, the following effect of electric current is used
|
(a) Magnetic |
(b) Heating |
(c) Chemical |
(d) Induction |
In a coil of self inductance 0.5 henry, the current varies at a constant rate from zero to 10 amperes in 2 seconds. The e.m.f. generated in the coil is
|
(a) 10 volts |
(b) 5 volts |
(c) 2.5 volts |
(d) 1.25 volts |
$\frac{1}{\lambda}$
$\Big(\text{ln}\frac{2}{\lambda}\Big)$
$\lambda(\text{ln}2)$
$\frac{\lambda}{(\text{ln})2}$
A and B are two concentric circular conductors of centre O and carrying currents 
and 
as shown in the adjacent figure. If ratio of their radii is 1 : 2 and ratio of the flux densities at O due to A and B is 1 : 3, then the value of 
is
|
(a) |
(b) |
(c) |
(d) |
