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Physics

Physics
These waves cannot be transmitted through vacuum.

Heat
Electromagnetic
Sound
Light

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Physics
The period of revolution of a geostationary satellite is

Changing continuously
365 days
24 hours
30 days

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Physics
A device used for converting a.c. into d.c. is called

Dynamo
Rectifier
Transformer
Induction coil

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Physics
The sounds having a frequency of 20 Hertz to 20,000 Hertz are known as

Ultrasonics
Audible sounds
Megasonics
Infrasonics

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Physics
Find the power of a convex lens if the image formed is at a distance of 25 cm from the lens when the object is placed on the other side of the lens at 12 cm from the optical centre?

4.33 diopters
-12.33 diopters
-4.33 diopters
12.33 diopters

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Physics
Lakes freeze in cold countries in winter, leaving the water underneath at

4°F
0°F
4°C
0°C

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MORE MCQ ON Physics

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