The Resistivity of the Material of a Given Wire Using a Metre Bridge NEET Questions

Physics - Experimental Skills

The Resistivity of the Material of a Given Wire Using a Metre Bridge MCQ Questions


7.
Why is the metre bridge wire made of an alloy like constantan or manganin?
A.
Because they look attractive
B.
Because they are cheap
C.
These have low temperature coefficient and uniform thickness, ensuring resistance per unit length stays constant
D.
Because they conduct very well
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ANSWER :
C. These have low temperature coefficient and uniform thickness, ensuring resistance per unit length stays constant
8.
In a Wheatstone bridge at balance, no current flows through the galvanometer because:
A.
The galvanometer is broken
B.
The galvanometer's resistance is infinite
C.
Points B and D (galvanometer terminals) are at the same potential
D.
The battery voltage is zero
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ANSWER :
C. Points B and D (galvanometer terminals) are at the same potential
9.
If the galvanometer in a Wheatstone bridge is replaced by a battery and the battery by a galvanometer, then:
A.
The balance condition remains the same
B.
Bridge cannot be balanced
C.
The balance condition reverses
D.
Galvanometer is destroyed
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ANSWER :
A. The balance condition remains the same
10.
In the metre bridge, when the bridge is balanced, the unknown resistance X is given by:
A.
X = R × l × (100-l)
B.
X = R / (l(100-l))
C.
X = R × (l/(100-l))
D.
X = R × ((100-l)/l)
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ANSWER :
C. X = R × (l/(100-l))
11.
The metre bridge wire is generally made of:
A.
Aluminium
B.
Pure copper
C.
Iron
D.
Constantan or manganin (or sometimes nichrome)
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ANSWER :
D. Constantan or manganin (or sometimes nichrome)
12.
The two L-shaped copper strips on a metre bridge serve to:
A.
Increase the temperature
B.
Add capacitance
C.
Increase the bridge's resistance
D.
Provide thick, low-resistance connections (so all the resistance is in the wire and the gap-resistors)
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ANSWER :
D. Provide thick, low-resistance connections (so all the resistance is in the wire and the gap-resistors)