Class 12 Bihar Board Physics :
1. If any ammeter is shunted, then the total resistance of the circuit :
a. Increases
b. Decreases
c. remains same
d. none of these
Ans – ( B )
2. Resistance of ideal ammeter is
a. Infinity
b. Zero
c. 100 ohm
d. 50 ohm
Ans – ( B )
3. The resistance of an ideal ammeter is
a. Small
b. Large
c. Infinite
d. Zero
Ans – ( D )
4. The S.I unit of magnetic field ( or magnetic induction ) is
a. Tesla
b. Weber
c. Henry
d. Farad
Ans – ( A )
5. The magnetic moment of a one turn coil of area A and current I will be
a. IA
b. IAB
c. NIC
d. None
Ans – ( A )
6. When an ammeter is shunted, it’s total conductance
a. Increase
b. Decreases
c. Remains unchanged
d. none of these
Ans – ( A )
7. The magnetic induction line in a toroid is
a. Uniform
b. Circular
c. Straight
d. None of these
Ans – ( B )
8. The substance used for permanent magnet is
a. Steel
b. Soft iron
c. Copper
d. None of these
Ans – ( A )
9. The magnetic susceptibility of air is
a. Positive
b. Positive or negative
c. Negative
d. Zero
Ans – ( D )
10. Which of the following show hysterisis ?
a. Paramagnetic
b. Diamagnetic
c. Ferromagnetic
d. None of these
Ans – ( C )
Bihar Board Exam Questions 2024 Class 12 Bihar Board Physics
11. A plane mirror is used in a deflection magnetometer to
a. Remove parallax
b. Bring in magnetic meridian
c. To view the needle
d. None of these
Ans – ( A )
12. Which of the has a low value in ferrites ?
a. Conductivity
b. Magnetic susceptibility
c. Permeability
d. All of above
Ans – ( A )
13. The relative permeability of diamagnetic substance is
a. Large
b. Very small
c. Zero
d. None of these
Ans – ( B )
14. Copper is
a. Diamagnetic
b. Ferromagnetic
c. Paramagnetic
d. None of these
Ans – ( A )
15. A piece of iron is
a. Paramagnetic
b. Diamagnetic
c. Ferromagnetic
d. None of these
Ans – ( C )
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