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Physics

Physics
Electric current is measured by which instrument?

Ammeter
Barometer
Sinometer
Voltmeter

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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
C/7
7C

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Physics
What is the other name of Galileo's law of falling bodies?

Newton's third law
Newton's first law
Law of motion
Newton's second law

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Physics
Sound produced at a point is heard by a person after 5 second, while the same sound is heard by another person after 6 seconds. If the speed of sound is 300 m/s, what could be the maximum and minimum distances between the two persons?

2.2 km, 0.20 km
3.3 km, 0.30 km
1.8 km, 0.15 km
2.8 km, 0.25 km

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Physics
Magnetic keepers are pieces of

Steel
Soft iron
Nickel
Cobalt

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Physics
A convex mirror of focal length f (in air) is immersed in a liquid (u=4/3). The focal length of the mirror in the liquid will be :

F
(4/3)f
(7/3)f
(3/4)f

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