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Physics

Physics
Sound waves cannot travel in

Glass
Water
Hydrogen gas
Vacuum

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Physics
An ice block with a piece of lead embeded in it floats in water. If ice melts the water level

Falls first and then rises
Remains same
Rises
Falls

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Physics
Surface tension in a liquid is due to :

Cohesive force between molecules
Gravitational force between molecules
Adhesive force betweenmolecules
Electrical force between molecules.

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Physics
Which of the following device is best suited for measuring the temperature inside metallurgical furnaces?

Thermistor
Thermometer
Thermocouple
Pyrometer

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Physics
The large collection of stars, dust and gas held together by gravitational attraction between components is known as

Cluster
Sun Family
Atmosphere
Galaxy

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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:

150 J
100 J
50 J
75 J

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