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Physics

Physics
What is the minimum distance (in metres) required to hear an echo?

10
17
21
13

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Physics
An athlete runs before long jump to get advantage on

Principle of moments
Frictional force
Moment of a force
Inertia of motion

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Physics
The shape of our milky way galaxy is

Elliptical
Circular
None of these
Spiral

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Physics
Small bubbles are perfectly spherical because of

Viscosity
Gravity
Pressure
Surface tension

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Physics
A parallel-plate capacitor of capacitance C1 is made using two gold plates. Another parallel-plate capacitor of capacitance C2 is made using two aluminium plates with same plate separation, and all the four plates are of same area. If rg and ra are respectively the electrical resistivities of gold and aluminium, then which one of the following relations is correct?

C1pa = C2pg
C1 = C2
C2>C1
C1>C2

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Physics
When a card placed over a tumbler is flicked with the finger, the coin placed over it falls in the tumbler.

Law of conservation of momentum
Newton's third law of motion
Law of conservation of energy
Law of Inertia

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