- ABoth inputs are 0.
- BEither input is 1.
- CBoth inputs are 1.
- DEither input is 0.
Explanation:
The truth table for 2-input OR gate is as shown in the figure. Thus, the output is zero only when both inputs are zero.
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Three identical point charges, as shown are placed at the vertices of an isosceles right angled triangle. Which of the numbered vectors coincides in direction with the electric field at the mid-point M of the hypotenuse
|
(a) 1 |
(b) 2 |
(c) 3 |
(d) 4 |
The truth table shown in figure is for
|
A |
0 |
0 |
1 |
1 |
|
B |
0 |
1 |
0 |
1 |
|
y |
1 |
0 |
0 |
1 |
|
(a) XOR |
(b) AND |
(c) XNOR |
(d) OR |

Two voltameters, one of copper and another of silver, are joined in parallel. When a total charge q flows through the voltameters, equal amount of metals are deposited. If the electrochemical equivalents of copper and silver are
and
respectively the charge which flows through the silver voltameter is
|
(a) |
(b) |
(c) |
(d) |
The ratio of the speed of the electron in the first Bohr orbit of hydrogen and the speed of light is equal to (where e, h and c have their usual meanings)
|
(a) 2πhc/ |
(b) |
(c) |
(d) 2π |
The ratio of intensities of two waves is 9 : 1. They are producing interference. The ratio of maximum and minimum intensities will be
|
(a) 10 : 8 |
(b) 9 : 1 |
(c) 4 : 1 |
(d) 2 : 1 |
The hottest planet of solar system is
|
(a) Mars |
(b) Mercury |
(c) Venus |
(d) Pluto |
Two identical circular loops of metal wire are lying on a table without touching each other. Loop-A carries a current which increases with time. In response, the loop-B
|
(a) Remains stationary |
|
(b) Is attracted by the loop-A |
|
(c) Is repelled by the loop-A |
|
(d) Rotates about its CM, with CM fixed |
A hollow insulated conducting sphere is given a positive charge of 10μC. What will be the electric field at the centre of the sphere if its radius is 2 meters
|
(a) Zero |
(b) 5 |
(c) 20 |
(d) 8 |