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146 questions

Question 1 of 20 146 total questions

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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Question 27

waec 2000

The duality of matter implies that matter

Aexists as a particle of dual composition

Bhas momentum and energy

Chas both wave and particle properties

Dis made up of dual materials

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Question 28

waec 2000

In a nuclear reactor, electricity can be generated through the following processes. Arrange the processes in the correct order. i. The steam is used to drive turbines. ii. The heat energy released is removed by passing water through the reactor. iii. The turbines in turn generate electricity. iv. The water then passes through some form of heat exchanger to produce steam

Aii, iv, i and iii

Bi, ii, iii and iv

Ciii, i, iv and ii

Div, i, iii and ii

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Question 29

waec 2000

The nucleon number and the proton number of a neutral atom of an element are 23 and 11 respectively. How many neutrons are present in the atom?

A11

B12

C23

D34

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Question 30

waec 2000

A proton of wavelength \(\lambda_o\) is emitted when an electron in an atom makes a transition from a level of energy 2E. If the electron transits from \(\frac{4}{3}E_k\) to E level, determine the wavelength of the photon that would be emitted

A3\(\lambda_o\)

B2\(\lambda_o\)

C\(\frac{3}{4}\)\(\lambda_o\)

D\(\frac{1}{3}\)\(\lambda_o\)

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Question 31

waec 2000

In which of the following transitions is the largest quantum of energy liberated by an hydrogen atom when the electron changes energy levels? [n is the quantum number]

An = 2 to n = 1

Bn = 1 to n = 2

Cn = 2 to n = 3

Dn = 3 to n = 2

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Question 32

waec 2000

Absorption line spectra exhibited by atoms is a result of

Achange in the kinetic energy of a movimg atom

Binstability of the nucleons

Cexcitation of an electron in the atom

Dtransition of an electron from a higher to a lower energy level

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Question 33

waec 2000

A material of mass 1.0 x 10\(^{-2}\)kg undergoes a fission process which decreases its mass by 0.02 percent. Calculate the amount of energy released in the process. (c = 3.0 x 10\(^{8}\)ms\(^{-1}\))

A1.8 x 10²⁰J

B1.8 x 10¹³J

C1.8 x 10¹¹J

D1.8 x 10¹⁰J

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Question 34

waec 2000

The half life of a radioactive substance is 14 days. If 48g of this substance is stored, after how many days will 1.5g of the original substance remain?

A84 days

B70 days

C56 days

D40 days

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Question 35

waec 2000

A nuclide \(^{202}_{84} Y\) emits in succession an \(\alpha-particle\) and a \(\beta-particle\). The atomic number of the resulting nuclide is

A198

B83

C82

D80

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Question 36

waec 2000

Borh's theory provides evidence for the

Astructure of the atom

Bpositive charge of an electron

Cexistence of energy level in the atom

Dpositive charge on a proton

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Question 37

waec 2000

calculate the inductance of an inductor whose reactance is one ohm at 50 Hz.

A2.00 x 10^-2H

B6.36 x 10^-2H

C3.18 x 10^-3H

D4.55 x 10^-2H

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Question 38

waec 2000

An inductor of inductance 10H carries a current of 0.2A. Calculate the energy stored in the inductor

A0.1J

B0.2J

C1.0J

D2.0J

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Question 39

waec 2000

If a bar magnet is accidentally broken into three pieces as shown in the diagram above, the polarities of P and Q respectively, are

AS and S

BN and S

CN and N

DS and N

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Question 40

waec 2000

A device used to prevent wearing away of the make and-brake contacts of an induction coil is called a\an

Afuse

Belectroscope

Cresistor

Dcapacitor

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