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Physics Past Questions and Answers

Waec Physics Questions

Question 816:

Three identical lamps each power 100W are connected in parallel across a potential difference of 250V. Calculate the current in the circuit

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A 7.5A
B 2.5A
C 1.2A
D 0.8A

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Question 817:

An electric bulb is rated 60W, 220V. Calculate the resistance of its filament when it is operating normally

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A 296.7\(\Omega\)
B 400.0\(\Omega\)
C 512.2\(\Omega\)
D 806.7\(\Omega\)

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Question 818:

The Earth's magnetic equator passes through Jos in Nigeria. At Jos. the

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A Angle of variation is zero
B Magnetic declination is 90^o
C Angle of dip is zero
D Horizontal component of the Earth's magnetic field is zero

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Question 819:

Which of the following statements about magnetic lines of force is not correct?

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A A magnnetic line of force is an imaginary line which the north pole of a magnet would describe if it is free to moves
B Magnetic lines of force do not cross one another
C Magnetic lines of force are closely packed together at neutral point
D The presence of magnetic lines of force in a region indicates the presence of a magnetic field

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Question 820:

The material used for constructing the core of an electromagnet is

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A Iron
B Carbon
C Copper
D Steel

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