This symbol represents

|
(a) NOT gate |
(b) OR gate |
(c) AND gate |
(d) NOR gate |
This symbol represents

|
(a) NOT gate |
(b) OR gate |
(c) AND gate |
(d) NOR gate |
(a) NOT gate
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Consider an extended object immersed in water contained in a plane trough. When seen from close to the edge of the trough the object looks distorted because:

In the following circuit, 5W resistor develops 45 J/s due to current flowing through it. The power developed per second across 12 W resistor is
|
(a) 16 W |
(b) 192 W |
(c) 36 W |
(d) 64 W |
The electron mobility in N-type germanium is 3900 cm2/v-s and its conductivity is 6.24 mho/cm, then impurity concentration will be if the effect of cotters is negligible
|
(a) 1015 cm3 |
(b) 1013 /cm3 |
(c) 1012 /cm3 |
(d) 1016 /cm3 |
In a Young’s double slit experiment, the slit separation is 0.2 cm, the distance between the screen and slit is 1m. Wavelength of the light used is 5000 Å. The distance between two consecutive dark fringes (in mm) is
|
(a) 0.25 |
(b) 0.26 |
(c) 0.27 |
(d) 0.28 |
If a source of light is moving away from a stationary observer, then the frequency of light wave appears to change because of
|
(a) Doppler's effect |
(b) Interference |
(c) Diffraction |
(d) None of these |
A rectangular coil 20 cm × 20 cm has 100 turns and carries a current of 1 A. It is placed in a uniform magnetic field B = 0.5 T with the direction of magnetic field parallel to the plane of the coil. The magnitude of the torque required to hold this coil in this position is
|
(a) Zero |
(b) 200 N-m |
(c) 2 N-m |
(d) 10 N-m |
The contribution in the total current flowing through a semiconductor due to electrons and holes are
and
respectively. If the drift velocity of electrons is
times that of holes at this temperature, then the ratio of concentration of electrons and holes is
|
(a) 6 : 5 |
(b) 5 : 6 |
(c) 3 : 2 |
(d) 2 : 3 |