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Physics

Physics
In MRI machine, which one of the following is used?

X-ray
Ultra-sound wave
Magnetic wave
Sound wave

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Physics
In order to make an electromagnet you need a

All of these
Dry cell batteries
Iron nail
Thin coated copper wire

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Physics
Force of impact is the force

By the speed of the object
None of these
When the objects meet
By the objects weight

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Physics
Sound is heard over longer distances on rainy days because

Moist air does not absorb sound
Moist air absorbs sound
Sound travels faster in moist air
Sound travels slowly in moist air

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Physics
A microscope used in pathological laboratories forms

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

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

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

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