Physics
If objects appear enlarged and inverted in a rear view mirror, then which type of mirror is used?

Plane
Cylindrical
Convex
Concave

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Physics
Planets are

luminous heavenly bodies that do not twinkle
luminous heavenly bodies revolving around a star
luminous heavenly bodies that twinkle
non-luminous heavenly bodies

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Physics
Why are we able to hear short wave broadcasts better than long wave broadcasts ?

Short waves are unaffected by atmospheric disturbances.
Short wave broadcasts are made by nearby radio stations.
Short waves are more energetic than long waves.
By convention, short waves are meant for long distances, whereas long waves are reserved for short distances.

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