Physics
The device which transfer the signal from low resistance region to high resistance region is

Capacitor
Diode
Inductor
Transistor

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Physics
Two identical solid pieces, one of gold and other of silver, when immersed completely in water exhibit equal weights. When weighed in air (given that density of gold is greater than that of silver)

Weighing will depend on their masses
Both silver and gold pieces weigh equal
The silver piece will weigh more
The gold piece will weigh more

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Physics
Which one of the following is the correct sequence of passage of light in a compound microscope?

Objective lens -Condenser -Body tube -Eye piece
Condenser -Objective lens -Eye -piece -Body tube
Condenser -Objective lens -Body tube -Eyepiece
Eyepiece -Objective lens -Body tube -Mirror

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Physics
The bats can fly in the dark because

They generate flashes of light
They have weak legs and are likely to be attacked by predators
They generate ultrasonic sound waves
They can see the objects in darkness

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