Physics
Point A is at a lower electrical potential than point B. An electron between them on the line joining them will

Move towards A
Remain at rest
Move at right angles to the line joining A and B
Move towards B

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Physics
It is more difficult to walk on a sandy road than on a concrete road because

sand is soft and concreter is hard.
the friction between sand and feet is more than that between concrete and feet.
the sand is grainy but concrete is smooth.
the friction between sand and feet is less than that between concrete and feet.

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Physics
The bats can fly in the dark because

They generate flashes of light
They have weak legs and are likely to be attacked by predators
They generate ultrasonic sound waves
They can see the objects in darkness

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