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Physics

Physics
The focal length of a concave mirror with a radius of curvature of 20.0 cm is :

20 cm
15 cm
5 cm
10 cm

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Physics
A boat loaded with rocks floats in the middle of a swimming pool. A man in the boat throws the rocks overboard. The level of water in the pool will

Decrease
Remains the same
First decrease and then increase
Increase

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Physics
The absolute zero is a temperature at which ________

Molecular motion in a gas would cease
Water freezes
All gases become solid
All gases become liquid

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Physics
Curie point is the temperature at which

A metal loses magnetic properties.
A metal loses conductivity
Matter becomes radioactive
Transmutation of metal occurs.

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Physics
A microscope used in pathological laboratories forms

Magnified, virtual, erect image
Magnified, virtual and inverted image
Diminished, real and erect image
Diminished, virtual and erect image

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Physics
Light beam which is highly directional is called:

Eraser
Laser
Maser
Grazer

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