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Physics

Physics
An object which absorbs all colours and reflects none appears:

Grey
Black
White
Blue

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Physics
Which of the following supports particle nature of photons ?

Interference
Polarization
Photoelectric effect
Diffraction

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Physics
A parallel-plate capacitor of capacitance C1 is made using two gold plates. Another parallel-plate capacitor of capacitance C2 is made using two aluminium plates with same plate separation, and all the four plates are of same area. If rg and ra are respectively the electrical resistivities of gold and aluminium, then which one of the following relations is correct?

C1pa = C2pg
C1 = C2
C2>C1
C1>C2

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Physics
For a freely falling body, the sum of kinetic energy and potential energy is always

Same
Zero
Unity
Variable

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Physics
The pressure of a fluid varies with depth h as P = PQ+pgh, where p is the fluid density. This expression is associated with

Newton's law
Bernoulli's principle
Archimedes' principle
Pascal's law

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Physics
At constant pressure, the volume of a fixed mass of a gas is directly proportional to its absolute temperature. It is the statement of

Boyle's Law
Charle's Law
Gay-Lussac's Law
Avogadro's Law

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