- Asum of A and B is Y.
- BY exists when A exists or B exists or both A and B exist.
- CY exists only when A and B both exist.
- DY exists when A or B exist but not when both A and B exist.
Explanation:
In Boolean algebra, A + B = Y implies that Y exists when A exists or B exists or both A and B exist.
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Two rods of same material and length have their electric resistance in ratio 1 : 2. When both rods are dipped in water, the correct statement will be
|
(a) A has more loss of weight |
(b) B has more loss of weight |
|
(c) Both have same loss of weight |
(d) Loss of weight will be in the ratio 1 : 2 |
The e.m.f. of a standard cell balances across 150 cm length of a wire of potentiometer. When a resistance of 2 Ω is connected as a shunt with the cell, the balance point is obtained at 100 cm. The internal resistance of the cell is
|
(a) 0.1 Ω |
(b) 1 Ω |
(c) 2 Ω |
(d) 0.5 Ω |
Assertion : In high latitude one sees colourful curtains of light hanging down from high altitudes.
Reason : The high energy charged particles from the sun are deflected to polar regions by the magnetic field of the earth.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
In electromagnetic induction, the induced charge in a coil is independent of
|
(a) Change in the flux |
(b) Time |
|
(c) Resistance in the circuit |
(d) None of the above |
Lenz’s law applies to
|
(a) Electrostatics |
(b) Lenses |
|
(c) Electro-magnetic induction |
(d) Cinema slides |
The intensity of electric field required to balance a proton of mass 1.7
and charge 1.6
is nearly
|
(a) |
(b) 1 |
(c) 1 |
(d) 1 |