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Syllabus

(a) copper (b) mercury (c) carbon (d) platinum.

(a) the total resistance of the circuit, and

(b) the reading of ammeter A.

$21.5Cofchargeiscarriedacrossaconductorhavingpotential\phantom{\rule{0ex}{0ex}}differenceof100V.Howmuchisworkdoneinthisprocess?\left[500Joule\right]\phantom{\rule{0ex}{0ex}}22.Aresis\mathrm{tan}cewireof6\Omega iscutintofourequalparts.\phantom{\rule{0ex}{0ex}}Whatistheresis\mathrm{tan}ceofeachpart?\left[1.5\Omega \right]$

of electrons transferred. Which way these electrons move. Charge on an electron = 1.6 × 10

^{–19}C.25. A sound is produced at one end of a long steel rail. Two distinct sounds are observed on the other end of this rail. Why ? The time gap between these sounds is found to be 0.35 second. What is the length of the rail ? Speed of sound in air = 330 $m{s}^{-1}$. Speed of sound in steel = 5100 $m{s}^{-1}$.

[123.5 m]

Thanks

Q.19. In a circuit given below, find:

(i) Total resistance of the circuit,

(ii) Total current flowing in the circuit, and

(iii) The potential difference across ${R}_{1}$

Q. If a glass rod is rubbed with silk cloth, the glass rod acquires a positive charge of 12.8 C. Calculate number of electrons transferred. Which way these electrons move. Charge on electron = 1.6 x ${10}^{-19}$ C.

Q. What current flows in a resistance of 2kohm when

(i) a p.d. of 9 V and

(ii) a p.d of 6 mV is applied one by one?

Q. What do you mean by electric potential. Explain it by taking the analogy to liquid flow and heat flow.

Q. A current of 5 mA flows through $CuS{O}_{4}$ solution for 40s. How many Cu' ' ions will deposit on cathode of the apparatus?

Q. Two lamps one rated 40 wan at 220 volt and other 60 watt 800 volt are connected in parallel to the Electric Supply at 220 volt.

(a) Draw a circuit diagram to show the connections

(b) Calculate the current drawn from the Electric Supply

(c) Calculate the total energy consumed by the two lamps together when they operate for 1hour.

ANS . b(0.45A) C (356.4 K3)

Q). A 5 coulomb charge is moved from one conductor to other. It does 10 joules of work. What is the potential difference between the two conductors?

[2 V]Q.17. The figure shows two resistors of same material and same cross-section area but having lengths 2l and l respectively. What is the ratio of their resistances?

[Ans. 2 : 1]

Q.14. Velocity of sound in air at 0$\xb0C$ is 330 $m{s}^{-1}$. What is this velocity at temperature 30$\xb0C$?

a. increase

b. decrease

c. first decrease and then increase

d. remain unchanged

Q. If 0.2 C charge passes through cross-section of a conductor is 200 s, calculate the current in the conductor.

Please do not provide any link.

Q.8. Two wires of the same material and same length have radii 1 mm and 2 mm respectively. Compare :

(i) their resistances, (ii) their specific resistance.

Ans. (i) 4 : 1 (ii) 1 : 1

Q.12. A conductor carries 2 ampere current. Calculate the amount of charge flown through a cross-section of this conductor in 10 s.

[20 C]V=k(q/r^2)