Test Chapter No.13 current electricity 2nd year F.Sc Long questions

                                                                Long Questions

Q.No.3: -  Explain the following question.  Attempt all  ( Mark 3+3=6 each question)

Q.No.1:- (i) Find the power dissipation in a resistor also give its units.

(ii) How many electron pass through an electric bulb in one minute if the 300mA current is passing through it?

Q.No.2: -(i) State and explain electromotive force and internal resistance of a source of emf. Also calculate the emf for a source of emf. Why potential difference is less than the emf. 

(ii) A charge of 90 C passes through a wire in 1 hour and 15 minutes. What is the current in the wire?

Short Questions for fsc 2nd year 13 chapter current electricity

Q.No.2: -Write the brief answers of the following questions.  Attempt Any 4  (mark 8)

(i) Why does the resistance of a conductor rise with temperature?

(ii) Do bends in a wire affects its electrical resistance?

(iii) Is the filament resistance lower or higher in a 500W, 220V light bulb in a 100W bulb?
(iv) How the heat produced when current flows in a conductor, on which factors the heat of the resistance depends?

(v) Define ohm law. Why the ohmic device doesn’t exist?

(vi) Draw the graph between current and voltage for semiconductor diode and also describe that why the graph turn towards current axis and not toward the voltage axis?

(vii) Define current also write its unit.

M.C.Q's Chapter No 13 Current Electricity 2nd year

Q.No.1: - Tick the correct answer.                        Mark 10

(i) Which type of energy is stored in a cell?

(a) Heat energy       (b) Potential energy     (c) Kinetic Energy        (d) Chemical energy

(ii) The pattern of magnetic field formed around a straight conductor is

(a) Circular              (b) elliptical                 (c) bar magnetic            (d) non of these

(iii) We can find resistance from the Ohm law by using the relation

(a) R=VI                  (b) R=V/I                     (c) V=IR                       (d) No of these

(iv) When the resistors are connected in series then the equivalent resistance will be equal to the

(a) sum of resistances   (b) sum of the reciprocal of all the resistances (c) average of the resistances (d) zero

(v) the units of conductivity is

(a) (ohm.m)^-1           (b) mho.m^-1                 (c) m.ohm^-1                    (d) both (a) and (b)

(vi) The resistivity is directly proportional to the

(a) Square of the area of the conductor (b) inverse of the resistance of the conductor

(c) Inverse of length of conductor (d) current of the conductor

(vii) On the resistor the silver band shows the tolerance of

(a) 5%                    (b) 7%                          (c) 10%                          (d) 20%

(viii) The power dissipation in a resistor is equal to

(a) P=VI                (b) P=V²I                     (c) P=R²I                       (d) P=V²/I

(ix) The resistance of a resistor with color code first “red” second “violet” third “orange” forth “silver”

(a) 47000 Ω           (b) 4000 Ω                    (c) 2700 Ω                     (d) 3700 Ω

(x) The color code of “Yellow” on a resistor is

(a) 1                       (b)4                               (c)8                                  (d) 3