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Question 21

neco 2000

Which of the following is used in a nuclear reactor to slow down fast moving neutrons?

Agraphite rods

Bcarbon dioxide gas

Cliquid sodium metal

Dconcrete shield

Eboron rods

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Question 22

neco 2000

The half-life of a radioactive substance is 2 seconds. Calculate the decay constant.

A2.890 s^-1

B1 .445 s^-1

C0.576 s^-1

D0.347s^-1

E0.152 s^-1

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Question 23

neco 2000

A piece of stone weights 180 N in air and 150 N in a beaker containing 160 N of methylated spirit. What is the up thrust exerted on the stone?

A50N

B40N

C30N

D20N

E10N

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Question 24

neco 2000

When a metal is heated to a high temperature, electrons are emitted from its surface. The process is known as

Aphotoelectric effect

Bthermionic emission

Cfield emission

Dsecondary emission

Eradioactive emission

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Question 25

neco 2000

The helium isotope \(^3_2He\)

Ahas three pro tons and two neutrons

Bhas two protons and one neutron

Chas two protons and three neutrons

Dhas one proton and two neutrons

Ecannot exist because it has the same mass number as tritium

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Question 26

neco 2000

A particle of charge q and mass m moving with a velocity v enters a uniform magnetic field B in the direction of the field. The force on the particle is

ABqv

BBq\(\frac{v}{m}\)

CBqvm

Dmv\(\frac{B}{q}\)

E\(\frac{mv}{Bq}\)

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