Resistance and Figure of Merit of a Galvanometer By Half Deflection Method NEET Questions

Physics - Experimental Skills

Resistance and Figure of Merit of a Galvanometer By Half Deflection Method MCQ Questions


13.
In the half deflection method, when only G is in the circuit (shunt key open), the current through G is:
A.
I_g = E + R
B.
I_g = E/R
C.
I_g = E/(R + G)
D.
I_g = E/G
😑 View Answer Rough Work Error
ANSWER :
C. I_g = E/(R + G)
14.
In the half deflection method, when shunt S is connected in parallel with G, the effective resistance of (G || S) is:
A.
G - S
B.
G × S
C.
G + S
D.
GS/(G + S)
😑 View Answer Rough Work Error
ANSWER :
D. GS/(G + S)
15.
In the half deflection method, the condition for the galvanometer reading to halve when shunt is connected is:
A.
The current through galvanometer becomes half its original value
B.
Voltage halves
C.
Power halves
D.
Resistance halves
😑 View Answer Rough Work Error
ANSWER :
A. The current through galvanometer becomes half its original value
16.
When the shunt S is added and deflection is halved, the relation derived for G is:
A.
G = R/S
B.
G = R × S/(R - S)
C.
G = R - S
D.
G = R + S
😑 View Answer Rough Work Error
ANSWER :
B. G = R × S/(R - S)
17.
The formula G = RS/(R - S) is derived under the assumption that:
A.
G = S
B.
The cell is ideal
C.
R is very small
D.
The current through R is essentially unchanged when shunt is added (true if R >> G, S)
😑 View Answer Rough Work Error
ANSWER :
D. The current through R is essentially unchanged when shunt is added (true if R >> G, S)
18.
Why is the formula G = RS/(R - S) considered an approximation?
A.
It uses wrong physics
B.
It is dimensionally wrong
C.
It neglects the small change in total circuit current when shunt is added
D.
It is exact
😑 View Answer Rough Work Error
ANSWER :
C. It neglects the small change in total circuit current when shunt is added