- AZero.
- BConstant different from zero.
- CProportional to the distance from the curve.
- DNone of the above.
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A particle of mass m and charge q moves with a constant velocity v along the positive x direction. It enters a region containing a uniform magnetic field B directed along the negative z direction, extending from x = a to x = b. The minimum value of v required so that the particle can just enter the region x > b is
|
(a) qb B/m |
(b) q(b – a) B/m |
(c) qaB/m |
(d) q(b + a)B/2m |
In the nuclear reaction
, the values of A and Z are
|
(a) A = 234, Z = 94 |
(b) A = 234, Z = 90 |
(c) A = 238, Z = 94 |
(d) A = 238, Z = 90 |
In the figure a carbon resistor has bands of different colours on its body as mentioned in the figure. The value of the resistance is

|
(a) 2.2 k W |
(b) 3.3 k W |
(c) 5.6 k W |
(d) 9.1 k W |
For the given combination of gates, if the logic states of inputs A, B, C are as follows A = B = C = 0 and A = B = 1, C = 0 then the logic states of output D are

|
(a) 0, 0 |
(b) 0, 1 |
(c) 1, 0 |
(d) 1, 1 |
A point object O is placed on the principal axis of a convex lens of focal length f = 20cm at a distance of 40cm to the left of it. The diameter of the lens is 10cm. An eye is placed 60cm to right of the lens and a distance h below the principal axis. The maximum value of h to see the image is:
The diagram shows the path of four a-particles of the same energy being scattered by the nucleus of an atom simultaneously. Which of these are/is not physically possible

|
(a) 3 and 4 |
(b) 2 and 3 |
(c) 1 and 4 |
(d) 4 only |
An oscillator is nothing but an amplifier with
|
(a) Positive feed back |
(b) Large gain |
|
(c) No feedback |
(d) Negative feedback |
Through two parallel wires A and B, 10 and 2 ampere of currents are passed respectively in opposite direction. If the wire A is infinitely long and the length of the wire B is 2 m, the force on the conductor B, which is situated at 10 cm distance from A will be
|
(a) 8 |
(a) 8 |
(c) 4 |
(d) 4π |