# Physics MCQs for Class 12 – Online Test

Physics MCQs for Class 12

Total Questions - 40

Total Marks - 40

Time - 2 Hours

1 / 40

SI unit of electrical capacitance is:

2 / 40

Which of the following remains same while two capacitors are joined in series:

3 / 40

A parallel plate capacitor is charged then the separation between the plates is increased. The potential difference between the plates will be:

4 / 40

Which of the following is not a unit of electrical capacitance:

5 / 40

Potential of earth is:

6 / 40

A, B and C are three hollow spherical conductors. They have some positive charge. C is smallest and A is biggest, then:

7 / 40

Unit of electric potential is :

8 / 40

Magnetic effect of electric current was discovered by:

9 / 40

Which of the following statement is incorrect:

10 / 40

The resistance of a galvanometer is RG, Resistance of ammeter is RA, and that of voltmeter is RV, which of the following statement is correct:

11 / 40

An electric circuit :

12 / 40

I ampere current is flowing through a wire of length 'l'. It is placed parallel to uniform magnetic field. The work done on it will be :

13 / 40

When a current is made to flow through a conductor then it produces:

14 / 40

A moving charge produces:

15 / 40

A current carrying coil acts as magnetic dipole. If area of coil is A and magnetic moment is M, then current flowing through the coil is:

16 / 40

Magnetic field is not produced by:

17 / 40

In the position of null deflection:

18 / 40

The SI unit of potential gradient is:

19 / 40

Internal resistance of cell depends upon:

20 / 40

Unit of specific resistance is:

21 / 40

The specific resistance of a wire depends upon the:

22 / 40

The order of drift velocity of free electrons in m/sec. is :

23 / 40

The relaxation time of free electrons in metals:

24 / 40

Two resistances R1 and R2 are joined in parallel. If their equivalent resistance is R then:

25 / 40

The resistance of a conductor does not depend upon:

26 / 40

Which of the following relation is not correct:

27 / 40

Ampere is unit of:

28 / 40

The flow of electric current through a conductor is:

29 / 40

The intensity of electric field (E) at a distance 'r' from the point charge Q is:

30 / 40

The number of electrons in 1 coulomb are:

31 / 40

The dielectric constant of air is:

32 / 40

The unit of intensity of electric field is:

33 / 40

When a dielectric medium is placed between the two charges instead of vacuum then the force between them:

34 / 40

If a spherical shell is given positive charge then:

35 / 40

The force of repulsion between the two point charges when they are kept at 'r' distance apart from each other is F. If the distance between them is doubted then the force of repulsion will be:

36 / 40

Unit of ϵo​ is :

37 / 40

The electric field due to a dipole is:

38 / 40

Two point charges are first placed in air and then kept in a medium of dielectric constant K as same distance. The ratio of force acting between the charges in the above two conditions be :

39 / 40

The force acting between two charges q1 and q2 is  The force:

40 / 40

If an electron is removed from an isolated body then the charge on that body will be :