Physics
Which of these is true of all simple machines?

None of these
These make work easier
Work input > work output
Both A & B

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Physics
Planets do not twinkle because

They are very far away from the earth resulting in decrease in intensity of light
They are nearer to earth and hence we receive a greater amount of light.
Their distance from the earth does not change with time
They emit light of a constant intensity

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Physics
What is a neuron ?

Basic unit of nervous system
Particle released during radioactivity
Basic unit of energy
The anti-particle of neutron

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