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Physics

Physics
Negative acceleration is in the opposite direction of:

Force
Distance
Velocity
Momentum

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Physics
Which one of the following wavelengths of light is most effective in photosynthesis ?

Green
Blue
Yellow
Orange

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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
5 R/4
R/5

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Physics
Suitable impurities are added to a semiconductor depending on its use. This is done in order to

increase its electrical conductivity
enable it to withstand higher voltages
increase its life
increase its electrical resistivity

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Physics
Carbon Arc lamps are commonly used in

Vehicles
Cinema projectors
Photography
Domestic lighting

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Physics
What is the wavelength of visible spectrum ?

7800 A° – 8000 A°
3900 A° – 7600 A°
1300 A°–3000 A°
8500 A° – 9800 A°

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