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The previously formed igneous and sedimentary rocks under go changes due to metamorhic action of pressure and internal heat to form metamorphic rock. Fill in the blanks

A storey of house completely below ground level is called Cellar of basement.

The size of LED bulb is usually smaller than a CFL bulb.

when the light emits in the forward biased, then it is called light emitting diode

Soon after the electrons are moving from the n-type to the p-type silicon, it combines with the holes, then it disappears. The holes don’t really move of course. It is just fixed positive ions grabbing neighbouring electrons, but it appears as if holes are moving.

The electrons makes the complete atom & more stable and it gives the little burst of energy in the form of a tiny packet or photon of light.

The working principle of the Light emitting diode is based on the quantum theory.

Eq = hf

Invar is generally known as FeNi36. It is a alloy of Nickel-Iron/steel. I t has low thermal coefficient of expansion and used in surveying.

Chain surveying is suitable when:

The ground is fairly leveled and open with simple details.
The area is small in extent.
Plans are required on a large scale.
Hence option D is the correct answer.

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