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Physics

Physics
The minimum number of geostationary satellites needed for uninterrupted global coverage is :

3
1
2
4

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Physics
The type of mirrors used in the headlamp of cars is

Spherical convex
Cylindrical concave
Plane
Parabolic concave

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Physics
For which one of the following, ''Diodes' are generally used for?

Amplification
Rectification
Filtration
Modulation

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Physics
Mud houses are cooler in summers and warmer in winters as compared to brick houses because

Mud is a good conductor
Evaporation of water causes cooling in summers and sunlight coming through holes causes warming in winters
Mud is a bad conductor
Mud is a poor insulator

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Physics
Which tube used to produce X-ray?

X-ray tube
None of these
Roentgen
Coolidge tube

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Physics
Which is an example of Phototropism?

Roots growing into the soil
A venus flytrap capturing a fly
Plant bending toward the light
Roots of a plant following water

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