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Physics

Physics
Red light has a wavelength of 70 A°. In "nm" it is

0.07 nm
700 nm
7 nm
70 nm

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Physics
The fact that the planets move around the Sun, not in circles but in ellipses, was first demonstrated by

Copernicus
Galileo
Martin Luther
Johannes Kepler

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Physics
Light from the star, Alpha Centauri, which is nearest to the earth after the sun, reaches the earth in

42 years
42 seconds
4.2 seconds
4.2 years

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Physics
Which of the following is an example for cantilever beam?

Common balance
Bridge
See-saw
Diving board

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Physics
What is the effective resistance (in Ω) of two resistors 20 Ω and 30 Ω connected in parallel?

24
50
12
36

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Physics
Which of the following is an example of continous emission spectrum?

Both
Spectrum of an oil frame
None
Spectrum of a water

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