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Physics

Physics
The sudden fall of atmospheric pressure indicates

Cold weather
Fair weather
Storm
Rain

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Physics
Minimum number of unequal vectors which can give zero resultant are

two
four
three
more than four

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Physics
In a particular system, the units of length, mass and time are chosen to be 10 cm, 10 g and 0.1 s respectively. The unit of force in this system will be equivalent to

100 N
0.1 N
10 N
1 N

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Physics
Least audible sound for most of the human ear is :

0.0002 µ bar
10.0 µ bar
5.0 µ bar
0.005 µ bar

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Physics
Mist is caused by

Dry ice
Water vapour at low temperature
Ice at low temperature
Carbon-monoxide in solid form

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Physics
In spherical polar coordinates (l, q, a), q denotes the polar angle around z-axis and a denotes the azimuthal angle raised from x-axis . Then the y-component of P is given by

Pcosq cosa
Psinq cosa
Pcosq sina
Psinq sina

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