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Physics Past Questions and Answers

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Physics Questions

Question 3121:

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 3122:

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 3123:

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 3124:

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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Question 3125:

The minimum energy required to remove an electron from an atom is known as

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A Excitation energy
B Ionization energy
C Binding energy
D Photon energy

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