# 10th Class Physics MCQS Chapter 5

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The combined resistance of two identical resistors, connected in series is 8?. Their combined resistance in a parallel arrangement will be:
12?
8?
4?
2?

Resistance of conductor is directly proportional to:
All of these
Pressure
Length
Area

Electron gun has an electrode called for controlling the flow of electrons in the beam:
Screen
Filament
Grid
Plate

The index of refraction depends on:
The image distance
The object distance
The focal length
The speed of light

The A.C. used in our houses has frequency _____ cycle/sec
30
130
50
60

The S.I unit of electric power is:
Volt
Joule
Ampere
Watt

The equivalent resistance in parallel combination is:
Rc=1/R1+1/R2+1/R3+……………..+1/Rn
Rc=R1+R2+R3 +……………..+Rn
a and b
None of these

An electric current in conductors is due to the flow of:
Positive ions
free electron
Negtive ions
Positive charge

As the temperature of a conductor rises, its resistance.
None of these
Does not change
Increase
Decrease

Which one is a safety device?
Fuse
Switch
Circuit breaker
Both B and C

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