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Physics

Physics
Mach number is used in connection with the speed of

ships
spacecraft
sound
aircraft

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Physics
An object covers distance which is directly proportional to the square of the time. Its accelaration is

Zero
Increasing
Decreasing
Constant

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Physics
Parsec is the unit of

Time
Intensity of light
Magnetic line
Distance

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Physics
Which determines the frequency of a sound wave?

Source
Speed
Medium
Amplitude

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Physics
A 4 kg object is moving horizontally with a speed of 5 m/s. To increase its speed to 10 m/s, the amount of net work required to be done on this object is:

50 J
75 J
100 J
150 J

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Physics
Vegetables are cooked in lesser time by adding a pinch of salt while cooking because

Latent heat of vaporization of water decreases
Boiling point of water decreases
Latent heat of vaporization of water increases
Boiling point of water increases

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