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Physics Past Questions and Answers

Waec Physics Questions

Question 926:

The direction of induced current in a straight wire placed in magnetic field is determined by using

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A Fleming's right hand rule
B Maxwell's screw rule
C Faraday's law
D Lenz's law

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Question 927:

Which of the following statements about an electromagnet is correct?

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A It is a temporary magnet
B Its strength depends on the current
C Its stength depends on the number of turns in its coil
D It has permanent poles

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Question 928:

Which of the following statements is not true of the isotopes of an element? They

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A Are atoms of the same element
B Have the same chemical properties
C Have the same atomic number
D Have the same mass number

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Question 929:

Which of the following statements is true of ultra violet radiations? It

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A Supports the sensation of hearing
B Does not cause the emission of electrons from metals
C Is an electromagnetic wave
D Is not capable of causing sun burns

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Question 930:

A radioactive element has a decay constant of 0.077s^-1, calculate its half life

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A 12.5s
B 9.0s
C 5.1s
D 0.5s

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