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Physics

Physics
Which of the following is a non renewable source of energy ?

Solar
Biogas
Coal
Wind

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Physics
A bird sitting on a high tension electric wire does not get electrocuted because

It has high resistance
The body is earthed
Its feet are good insulators
It does not form a closed path for the flow of current

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Physics
Hydraulic brakes work on the principle of

Thomson's law
Bernoulli's theorem
Pascal's law
Newton's law

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Physics
When a detergent is added to pure water, its surface tension

Remains constant
Increases
Decreases
Becomes infinite

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Physics
Light travels in a straight line (rectilinear propagation of light). This statement does hold if the medium of travel for light is

Of variable refractive index
Inhomogeneous and transparent
Made up of slabs of different refractive indices
Homogeneous and transparent

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Physics
When an atom loses an electron it becomes

Positive ion
Negative ion
Neutron
None of these

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