PHYSICS SCIENCE SA1 SEPTEMBER 2015
1a) How is the direction of electric current related to the direction of flow of electrons in a wire?
b) Calculate the number of electrons constituting 0.1 Coulomb of Charge?
2.Draw the magnetic field lines of the field produced by a current carrying loop?
3.An air conditioner of rating 2000W ,220 V is operated in a domestic circuit that has a current rating of 5A .What results do you expect .Justify your answer.
4.what would you expect the Ammeter and voltmeter reading from the circuit:
1,3 and 2 ohm and 3v
5.A coil of insulated copper wire is connected to agalvanometer, if magnet is pushed a) towards coil b) away from coil c) held stationary insid the coil.
6. AB is a current carrying conductor is shown in the figure.what are the direction of magnetic fields produced at points P and Q ? Given r1 r2,where the strength of magnetic field is larger?
7.a) Why are electric toaster and electric iron made of alloy rather than pure metal?
b) An electric ironof resistance 20 ohm takes a current of 5A calculate the heat developed in 30 seconds.
8,a)Explain the activity show that current carrying conductor experiences a force when placed in magnetic field.b) State the rule which shows direction of force on the conductor.
9.a)Draw schematic diagram of the common domestic electric circuit which has provision of one light and socket.b) describe the difference between overloading and short circuiting.
10.a)describe the construction and working of Box type solar cooker.Give its advantages and limitations.
b)Charcoal is better fuel than wood.Why?
11.a)What is OTEC? b)What is nuclear energy? Give two advantages and Hazards of Nuclear energy.
12.Write any two problems faced in constructing dams?