- 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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A copper disc of radius 0.1 m is rotated about its centre with 10 revolutions per second in a uniform magnetic field of 0.1 Tesla with its plane perpendicular to the field. The e.m.f. induced across the radius of disc is
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(a) |
(b) |
(c) π |
(d) 2π |
Assertion : The surface charge densities of two spherical conductors of different radii are equal. Then the electric field intensities near their surface are also equal.
Reason : Surface charge density is equal to charge per unit area.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
A power transformer is used to step up an alternating e.m.f. of 220 V to 11 kV to transmit 4.4 kW of power. If the primary coil has 1000 turns, what is the current rating of the secondary ? Assume 100% efficiency for the transformer
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(a) 4 A |
(b) 0.4 A |
(c) 0.04 A |
(d) 0.2 A |

Asteroids are
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(a) Small planets |
(b) Shooting stars |
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(c) Found in a belt between Earth ad Venus |
(d) None of these |
How should people wearing spectacles work with a microscope
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(a) They cannot use the microscope at all |
(b) They should keep on wearing their spectacles |
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(c) They should take off spectacles |
(d) (b) and (c) is both way |