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

Parabolic concave
Spherical convex
Cylindrical concave
Plane

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Physics
Which of the following is not a property of heavy water ?

Freezing point of heavy water is higher than that of ordinary water
Density of heavy water is higher than that of ordinary water
Boiling point of heavy water is lower than that or ordinary water
It produces corrosion

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Physics
The velocity of sound in air

Decreases with increase of temperature
Does not depend on temperature
Decreases with decrease of temperature
Increases with decrease of temperature

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Physics
In the process of magnetisation of a bar

Only some parts of the outer layers of the bar get magnetised
Only the surface of the bar gets magnetised
The entire bulk of the bar gets magnetised
Only the ends of the bar get magnetised

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