- ALight Carrying Diode
- BLiquid Crystal Display
- CLong Crystal Display
- DLight Crystal Display
Explanation:
LCD stands for "Liquid Crystal Display".
LCD is a special thin flat panel that can let light go through it, or can block the light. (Unlike an LED it does not produce its own light).
The panel is made up of several blocks, and each block can be in any shape. Each block is filled with liquid crystals that can be made clear or solid, by changing the electric current to that block.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Half-life of a radioactive substance is 20 minutes. Difference between points of time when it is 33% disintegrated and 67% disintegrated is approximately
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(a) 10 min |
(b) 20 min |
(c) 30 min |
(d) 40 min |
Assertion : Magnetic field interacts with a moving charge and not with a stationary charge.
Reason : A moving charge produces a magnetic field.
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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. |
The given truth table is of

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(a) OR gate |
(b) AND gate |
(c) NOT gate |
(d) None of above |
Positive rays consists of
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(a) Electrons |
(b) Neutrons |
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(c) Positive ions |
(d) Electro magnetic waves |
Assertion : If a charged particle is moving on a circular path in a perpendicular magnetic field, the momentum of the particle is not changing,.
Reason : Velocity of the particle in not changing in the magnetic field.
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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 helium nucleus makes a full rotation in a circle of radius 0.8 metre in two seconds. The value of the magnetic field B at the centre of the circle will be
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(a) |
(b) |
(c) 2 |
(d) |
When a ray of light passes from a denser to a rarer medium, some part of it gets ....... into the denser medium: