Important very short and short questions for board exam 12

Very Short Answer Type Questions

1.    What do you mean by quantisation of charge?

2.    Define Coulomb. How many electrons are in there in 1C of charge?

3.    Write the dimension of electric field.

4.    An electron(charge q) of mass  m is accelerated from rest in a uniform elec. Field E. Prove that velosity acquired by the electron in travelling a distance of x is .

5.    What is Gaussian Surface?

6.    What is the electric field inside a charged hollow spherical conductor?

7.    Write the formula of electric field in terms of p.d.

8.    Define Joule and its dimension.

9.    Give the relation b/n permiability of free space and permityvity of free space.

10.                       In nucleous of U-235 two protons are at the distance 6.0 * 10^(-15)m. Calculate their mutual electrostatic potential energy.

11.                       Express 1Med in Joule.

12.                       Relation b/n potential gradient and electric field.

13.                       Define capacitance of a capacitor.

14.                       Name any two dielectric commonly used in c apacitors.

15.                       Write effect of temprature on the dielectric constant  of a dielectric.

16.                       Is the wire current carrying charged?

17.                       In hydrogen atomthe electron makes 6*10^15 revolutions per second around the necleous. What will the current in the orbit?

18.                       Write Kirchhoff’s current rule.

19.                       Define dielectric constant

20.                       Define Lorentz Force. Also write its formula.

21.                       What is curie temprature?

22.                       Write the name of field which is generated by change in motion.

23.                       Write about magnetic dipole. Is it vector? What is its unit and dimension?

24.                       Give the magnitude of Earth’s magnetic field component and angle of Dip at the magnetic north pole of Earth.

25.                       What is angle of Dip?

26.                       Which physical quantity has the unit volt-second?

27.                       If V = 314Sin314, then find the frequency of alternating voltage V.

28.                       Write the unit of resistance.

29.                       Write the unit and dimension of L/C.

30.                       Write the equation of alternating current and voltage. When a capacitor is connected across an A.C. source.

31.                       Why is the core of transformer laminated?

32.                       Write the name of resions of energy losses in transformer.

33.                       Write about electric dipole.

34.                       Define electric dipole moment.