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Physics Pre-Mock Question Paper

Physics Pre-Mock

Course:Secondary Level

Exam Year:2011

NAIVASHA HIGH SCHOOL

PRE-MOCK

TERM ONE

DATE:5/3/2011

PHYSICS

INSTRUCTIONS:
1.All questions are compulsory.
2.Read and answer questions accordingly.

Q.1.Name two substances that are strongly attracted by magnets. (2 marks)
Q.2.Name two paramagnetic substances. (2 marks)
Q.3.Define the term 'line of force' as applied in magnetic fields.
(2 marks)
Q.4.Explain using domain theory of magnetism how magnetization is achieved by hammering an iron bar when it is pointing in the N-S direction. (2 marks)
Q.5.State two factors that affect the strength of an electromagnet. (2 marks)
Q.6.In a practical motor, the coil is usually wound on a laminated soft iron core.
a) State one advantage of a soft iron core. (2 marks)
b)State one problem that arises as the coils rotates in the magnetic fields. (1 mark)
Q.7.A transformer with 400 turns in the secondary circuit and 20 turns in the primary circuit has a p.d. of 240V in the primary circuit.What is the P.d. in the secondary circuit?
(5 marks)
Q.8.A step-down transformer has 600 turns in the primary circuit and N turns in the secondary circuit.If it is connected to a 240 mains supply and the voltage in the secondary circuit is 12V,determine the value of N. (2 marks)
Q.9.A heater rated 4 W,12 V is connected to the secondary circuit of a transformer with 600 turns in the primary circuit.If the primary circuit of the transformer is connected to 240 V mains,determine the number of turns in the secondary circuit and the current in the primary circuit.(2 marks)
Q.10.A radio has a transformer with an output of 6 V,and a power rating of 9 W.If the primary circuit has 120 turns and is connected to 240 V mains,determine:
a)the current in the secondary circuit. (2 marks)
b)the number of turns in the secondary circuit
(2 marks)
Q.11.A step-up transformer connected to a 20 V source delivers energy at 250V.If the efficiency of the transformer is 95%,determine the current in the primary circuit when the output terminals are connected to a lamp rated 250V,100W. (5 marks)

Physics Pre-Mock Question Paper

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