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Physics

Physics
Which type of radiation has the lowest penetrating ability?

All of these
Alpha
Beta
Gamma

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Physics
Of the following natural phenomena, tell which one known in Sanskrit as 'deer's thirst'?

Earthshine
Rainbow
Halo
Mirage

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Physics
A circular plate, a cube and a sphere, all made up of same material and having the samemass, are heated to 300°C and left in a room. Which of them will have the slowest rate of cooling?

Cube
All will cool at the same rate
Circular plate
Sphere

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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

7C
14C
C
C/7

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Physics
In Astrophysics, what name is given to a hypothetical hole in outer space from which stars and energy emerge?

Ozone hole
Black hole
White hole
Asteroid belt

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

4
3
1
2

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