Physics
Formation of shadows can be explained by

Reflection
Total internal reflection
Rectilinear propagation of light
Refraction

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Physics
Negative feedback in amplifiers

Increases bandwidth and decreases noise
Increases bandwidth and increases noise
Decreases bandwidth and decreases noise
Decreases bandwidth and increases noise

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Physics
A balloon filled with hydrogen will

Burst after reaching some height
Continue going upwards uninterrupted
Reach a particular height and remain floating
Reach a particular height and start coming down

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Physics
Which statement best describes an igneous intrusion?

Magma explodes to the surface and forms a smooth outer layer of rock
Magma is exported to an open area and forms iron
Magma is injected into surrounding rock forming an igneous intrusive
Igneous intrusion for when ice crystals splash into lava

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