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Physics

Physics
Intensity of gravitational field of earth is maximum at

Poles
Centre of earth
Surface
Equator

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Physics
Choose the most appropriate answer: Natural radioactivity was discovered by

Henry Bacquerel
Enrico Fermi
Earnest Rutherford
Marie Curie

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Physics
If you look into a mirror and find that the image (your reflection) is smaller than you, then the type of the mirror is:

Plano-concave mirror
Convex mirror
Concave mirror
Plane mirror

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Physics
A potentiometer wire is 100 cm long and a constant potential difference is maintained across it. Two cells are connected in series first to support one another and then in opposite direction. The balance points are obtained at 50 cm and 10 cm from the positive end of the wire in the two cases. The ratio of the emf's is :

0.12777777777778
0.20902777777778
0.21111111111111
0.12638888888889

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Physics
When an unbalanced force acts on an object

Causes the object to move
The speed & direction of the object will change
All of these
Causes change in motion of the object

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Physics
Which of the following are used for accurately measuring very small time intervals ?

Atomic clocks
Quartz clocks
Pulsars
White dwarfs

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