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Physics

Physics
What is the effective resistance (in Ω) of two resistors 20 Ω and 30 Ω connected in parallel?

36
24
12
50

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Physics
Atmospheric pressure exerted on earth is due to

Uneven heating of earth
Gravitational pull
Rotation of earth
Revolution of earth

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Physics
Pipelines in cold countries often burst in winter, because

Temperature of ice is less than that of water
Water freezes and expands in its volume
Pipelines expand due to freezing
Pipelines contract in their volume

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Physics
When a barometer is rising air pressure is

Increasing
Zero
Constant
Decreasing

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Physics
A parallel-plate capacitor,with air in between the plates, has capacitance C. Now the space between the two plates of the capacitor is filled with a dielectric of dielectric constant 7. Then the value of the capacitance will become

14C
C/7
C
7C

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Physics
The size of gear is usually specified by

Pressure angle
Circular pitch
Diametral pitch
Pitch circle diameter

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