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Physics

Physics
At what temperature (in Fahrenheit) pure water freezes?

48
32
37

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Physics
Stars are held together by

Ionic forces
Gravitational forces
Electrical forces
Magnetic forces

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Physics
Sound waves in air are

polarised
electromagnetic
transverse
longitudinal

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Physics
A light ray travelling from denser to rarer medium at an angle of incidence more than critical angle of concerned media pair suffers.

Diffraction
Total internal reflection
Reflection
Refraction

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Physics
Which of the following is a device designed to protect electrical devices from voltage spikes?

Surge protector
Voltage unloader
Heat protector
Current unloader

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Physics
Cloudy nights are warmer compared to clear cloudless nights, because clouds mainly

Produce heat and radiate it toward earth
Absorb heat from the atmosphere send it towards earth
Reflect back the heat given by earth
Prevent cold waves from the sky descending on earth

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