In diode, when there is saturation current, the plate resistance (
is
|
(a) Zero |
(b) Infinite |
|
(c) Some finite quantity |
(d) Data is insufficient |
(b) Infinite
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A steady current i is flowing through a conductor of uniform cross-section. Any segment of the conductor has
|
(a) Zero charge |
(b) Only positive charge |
|
(c) Only negative charge |
(d) Charge proportional to current i |
A car is moving with at a constant speed of 60kmh-1 on a straight road. Looking at the rear view mirror, the driver finds that the car following him is at a distance of 100m and is approaching with a speed of 5kmh-1. In order to keep track of the car in the rear, the driver begins to glance alternatively at the rear and side mirror of his car after every 2s till the other car overtakes. If the two cars were maintaining their speeds, which of the following statement (s) is/are correct?
$\frac{\text{W}}{2}$
$2^{\frac{1}{3}}$ W at the planet.
Assertion : A parallel plate capacitor is connected across battery through a key. A dielectric slab of constant K is introduced between the plates. The energy which is stored becomes K times.
Reason : The surface density of charge on the plate remains constant or unchanged.
|
(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. |
Two identical point charges are placed at a separation of d. P is a point on the line joining the charges, at a distance x from any one charge. The field at P is E, E is plotted against x for values of x from close to zero to slightly less than d. Which of the following represents the resulting curve
|
(a)
|
(b)
|
(c)
|
(d)
|
An infinitely long, straight conductor AB is fixed and a current is passed through it. Another movable straight wire CD of finite length and carrying current is held perpendicular to it and released. Neglect weight of the wire
|
(a) The rod CD will move upwards parallel to itself |
|
(b) The rod CD will move downward parallel to itself |
|
(c) The rod CD will move upward and turn clockwise at the same time |
|
(d) The rod CD will move upward and turn anti –clockwise at the same time |
In hydrogen atom, the electron is making 6.6 
around the nucleus in an orbit of radius 0.528 Å. The magnetic moment 
will be
|
(a) 1 |
(b) 1 |
(c) 1 |
(d) 1 |
An electron is moving towards x-axis. An electric field is along y-direction then path of electron is
|
(a) Circular |
(b) Elliptical |
(c) Parabola |
(d) None of these |
A convex lens makes a real image 4 cm long on a screen. When the lens is shifted to a new position without disturbing the object, we again get a real image on the screen which is 16 cm tall. The length of the object must be
|
(a) 1/4 cm |
(b) 8 cm |
(c) 12 cm |
(d) 20 cm |
