Class 12 Physics Objective
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 )
Class 12 Physics Objective
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 )
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 )
16. The magnetic susceptibility of paramagnetic substance is
a. Constant
b. Depends upon magnetic field
c. Infinity
d. Zero
Ans – ( A )
Bihar Board Class 12 Vvi objective
17. The most suitable metal for making permanent magnets is
a. Iron
b. Steel
c. Copper
d. Aluminium
Ans – ( B )
18. Which is more appropriate material for a strong electromagnetic ?
a. Air
b. Alloys of copper and nickel
c. Steel
d. Soft iron
Ans – ( D )
19. Which of the following materials has magnetic susceptibility negative less than 1 in value ?
a. Ferromagnetic
b. Paramagnetic
c. Diamagnetic
d. None of these
Ans – ( C )
20. Above Curie temperature, the ferromagnetic substance becomes
a. Paramagnetic
b. Diamagnetic
c. Semiconductor
d. Insulators
Ans – ( A )
21. The current sensitivity of a moving coil galvanometer Increases with Decrease in :
a. Magnetic field
b. Area of a coil
c. Number of turns
d. None of these
Ans – ( D )
22. The magnetic dipole moment of a current loop does not depend on the
a. Number of turns
b. Magnetic field in which it is kept
c. Current in the loop
d. Area of the loop
Ans – ( D )
23. The universal property of all the diamagnetic, paramagnetic and ferromagnetic substance is
a. Diamagnetism
b. Paramagnetism
c. Ferromagnetism
d. None of these
Ans – ( A )
24. In a moving coil galvanometer, we use a radial magnetic field so that the galvanometer scale is
a. Exponential
b. Linear
c. Algebraic
d. Logarithmic
Ans – ( B )
25. In a cyclotron the angular frequency of the charged particle is independent of the
a. Mass
b. Speed
c. Charge
d. Magnetic field
Ans – ( A )
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