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Physics

Physics
Mach number is used in connection with the speed of

ships
aircraft
sound
spacecraft

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Physics
Which combination of colour is the most convenient during day and night time ?

Yellow and blue
Organe and blue
Red and green
White and black

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Physics
Friction is caused by the ________ on the two surfaces in contact.

Irregularities
Smoothness
Gaps
Densities

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Physics
Supercooling is cooling of liquid ________

Below freezing point
At melting point
Above melting point
Below melting point

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Physics
Which one of the following animals can hear ultrasonic sound ?

Bat
Rat
Cat
Squirrel

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Physics
Which one of the following determines the sharpness of image in a camera ?

The exposure time
Size of the camera
The focal length of the lens
The aperture

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