Physics Past Questions - Myschool

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21

The speed of fast-moving neutrons in a nuclear reactor can be reduced by using?

A. graphite rods
B. concrete shield
C. iron rods
D. boron rods

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22

Arrange the following radiations in order of increasing ionization of air.

I. Alpha

Il. Gamma

IIl. Beta

A. I < III < II
B. II < I < III
C. II < III < I
D. I < II

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23

Gamma rays are produced when?

A. high velocity electrons are abruptly stopped in metals
B. energy changes occur within the nuclei of atoms
C. energy changes occur within the electronic structure of atoms
D. electrons are deflected in very strong magnetic fields

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24

An isotope has an initial activity of 120 Bq. 6 days later its activity is 15 Bq. The half-life is?

A. 3 days
B. 2 days
C. 1 day
D. 4 days

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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts

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