Physics
The type of mirrors used in the headlamp of cars is

Cylindrical concave
Parabolic concave
Plane
Spherical convex

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Physics
Two identical solid pieces, one of gold and other of silver, when immersed completely in water exhibit equal weights. When weighed in air (given that density of gold is greater than that of silver)

Both silver and gold pieces weigh equal
Weighing will depend on their masses
The silver piece will weigh more
The gold piece will weigh more

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