- AProduct of A and B is Y
- BY exists when A exists or B exists
- CY exists when both A and B exist but not when only A or B exists
- DY exists when A or B exists but not both A and B exist.
Explanation:
In Boolean algebra A.B = Y implies that Y exists when both A and B exist but not when only A or B exists.
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In an hydrogen atom, the electron revolves around the nucleus in an orbit of radius 0.53 . Then the electrical potential produced by the nucleus at the position of the electron is
|
(a) – 13.6 V |
(b) – 27.2 V |
(c) 27.2 V |
(d) 13.6 V |
In a coil of self inductance 0.5 henry, the current varies at a constant rate from zero to 10 amperes in 2 seconds. The e.m.f. generated in the coil is
|
(a) 10 volts |
(b) 5 volts |
(c) 2.5 volts |
(d) 1.25 volts |
The velocity of light emitted by a source S observed by an observer O, who is at rest with respect to S is c. If the observer moves towards S with velocity v, the velocity of light as observed will be
|
(a) c + v |
(b) c - v |
(c) c |
(d) |
A photon and an electron have equal energy E.
is proportional to
|
(a) |
(b) 1/ |
|
(c) 1/E |
(d) Does not depend upon E |
A step up transformer has transformation ration 5 : 3. What is voltage in secondary if voltage in primary is 60 V
|
(a) 20 V |
(b) 60 V |
(c) 100 V |
(d) 180 V |
A galvanometer, having a resistance of 50 W gives a full scale deflection for a current of 0.05 A. The length in meter of a resistance wire of area of cross-section 2.97 X 10–2 cm2 that can be used to convert the galvanometer into an ammeter which can read a maximum of 5 A current is (Specific resistance of the wire = 5 Wm)
|
(a) 9 |
(b) 6 |
(c) 3 |
(d) 1.5 |
The minimum wavelength of X-rays produced by electrons accelerated by a potential difference of volts is equal to
|
(a) |
(b) |
(c) |
(d) |