Physics
A boy sitting in an open car moving with the constant speed throws a ball straight up into the air. The ball falls

In front of him
Into his hand
Behind him
By his side

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

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.
sand is soft and concreter is hard.

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Physics
Analog synthesis refers to a technology based on

Placing brief digital recordings of live sounds under the control of a synthesizer keyboard.
Representing data in terms of measurable physical quantities.
Interfacing synthesizer equipment.
Representing physical quantities as numbers.

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Physics
Why does the sea appear blue in colour?

Scattering of the sunlight by water molecules
Interference of the sun light from water surface
Refraction of the sun light
Reflection of the sun light from water surface

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