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Physics

Physics
Lamberts law is related to

Refraction
Illumination
Interference
Reflection

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Physics
In SONAR which kind of wave is used?

Ultrasonic
Infrasonic
Audible sound
Radio

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Physics
The instrument for measuring intensity of earthquakes is called

Ediograph
Ergograph
Pantagraph
Seismograph

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Physics
Nuclear sizes are expressed in a unit named

Angstrom
Fermi
Newton
Tesla

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Physics
Sound produced at a point is heard by a person after 5 second, while the same sound is heard by another person after 6 seconds. If the speed of sound is 300 m/s, what could be the maximum and minimum distances between the two persons?

1.8 km, 0.15 km
2.2 km, 0.20 km
3.3 km, 0.30 km
2.8 km, 0.25 km

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Physics
The magnifying power of an astronomical telescope can be decreased by

None of these
Increasing the focal length of the eyepiece
Decreasing the focal length of the eyepiece
Increasing the focal length of the objective

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