Physics
Which one of the following is not a feature of Indifference Curve?

They are concave to each other
They do not intersect each other
They slope downwards to the right
They are parallel to each other

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Physics
Stationary wave is formed by

A transverse wave superposing a longitudinal wave
Two waves of same frequency travelling in the same direction
Two waves of same frequency travelling in the opposite direction
Two waves of the same speed superposing

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