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Physics

Physics
The distance between node and adjacent antinode is 30 cm. The wavelength is

90 cm.
60 cm.
120 cm.
30 cm.

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Physics
Who enunciated the laws of planetary motion?

Isaac Newton
Nicolaus Copernicus
Galileo
Johannes Kepler

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Physics
The angle between the ________ and the incident ray is called the angle of incidence.

Tangent
Surface
Reflected ray
Normal

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Physics
The wavelength of a wave is the distance between

Trough and Trough
Both B & C
Crest and Trough
Crest and Crest

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Physics
For which one of the following, ''Diodes' are generally used for?

Rectification
Amplification
Filtration
Modulation

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Physics
A copper wire of radius r and length l has a resistance of R. A second copper wire with radius 2r and length l is taken and the two wires are joined in a parallel combination. The resultant resistance of the parallel combination of the two wires will be

5 R/4
R/5
4 R/5
5 R

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