Multiple choice question XIX — task. Science CBSE, Class 10.

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1. Which of the following has least penetrating power?

Alpha particles
Gamma rays
Beta particles
All have the same penetrating power

2. Acid rain happens because

sun leads to heating of upper layer of atmospehre
burning of fossil fuels release oxides of carbon, nitrogen and sulphur in the atmosphere
electical charges are produced due to friction
None of these

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