When subjected to a transverse electric field, cathode rays move
|
(a) Down the potential gradient |
(b) Up the potential gradient |
|
(c) Along a hyperbolic path |
(d) Along a circular path |
(b) Up the potential gradient
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How much water should be filled in a container 21 cm in height, so that it appears half filled when viewed from the top of the container (given that a
= 4/3)
|
(a) 8.0 cm |
(b) 10.5 cm |
(c) 12.0 cm |
(d) None of the above |
The relation between a and b parameters of current gains for a transistors is given by
|
(a) α = |
(b) α = |
(c) α = 
|
(d) α = 
|
Which of the following plots may represent the thermal energy produced in a resistor in a given time as a function of the electric current
|
(a) a |
(b) b |
(c) c |
(d) d |
If a wire of resistance R is melted and recasted to half of its length, then the new resistance of the wire will be
|
(a) R/4 |
(b) R/2 |
(c) R |
(d) 2R |
A dip needle lies initially in the magnetic meridian when it shows an angle of dip q at a place. The dip circle is rotated through an angle x in the horizontal plane and then it shows an angle of dip 
. Then 
is
|
(a) |
(b) |
(c) |
(d) cos x |
Calculate the amount of charge flowing in 2 minutes in a wire of resistance 10 W when a potential difference of 20 V is applied between its ends
|
(a) 120 C |
(b) 240 C |
(c) 20 C |
(d) 4 C |
