Physics
Which of the following is not caused by atmospheric refraction of light ?

Sun becoming visible two or three minutes before actual sunrise
Sun appearing higher in the sky than it actually is
Sun appearing red at sunset
Twinkling of stars at night

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Physics
What is the direction of torque?

Same as the direction of applied force
Parallel to the radius
Opposite to the direction of applied force
Perpendicular to the direction of applied force

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