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141 questions JAMB 2483 WAEC 1904 NECO 322 CUSTOM 10

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141 questions

Question 1 of 20 141 total questions

Question 21

neco 2001

Notes of the same frequency sounded on a piano and on a flute may differ in

I. pitch
II. quality
III. Loudness

AI only

BII only

CI and III only

DII and III only

EI, II and III

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Question 22

neco 2001

What is the energy stored in a 10μ F capacitor if the potential difference between the plates is 40 V?

A2.0 × 10^-4J

B8.0 ×10^-4J

C4.0 × 10^-3J

D8.0 × 10^-3J

E1.6 × 10^-2J

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Question 23

neco 2001

Totally reflecting prisms are preferred to mirrors in periscopes because

I. mirror gives multiple images
II. silvering on mirrors is easily damaged
III. mirrors reflect less light than totally reflecting prisms

AI only

BI and II only

CI and III only

DII and III only

EI,II and III

View Explanation & Discuss

Question 24

neco 2001

Which scientist discovered natural radioactivity?

AEnrico Fermi

BHenri Becquerel

CMarie Curie

DMicheal Faraday

ENiels Bohr

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Question 25

neco 2001

50cm\(^3\) of air at a pressure of 5Nm\(^{-2}\) is enclosed in a metal tube by a piston. If the piston is pushed in a distance of 10cm, what will the pressure of the air become, if the cross-sectional area of the tube is 2cm\(^{-2}\)? (Assume that the temperature remains constant throughout)

A12.5 Nm^-2

B8.7 Nm^-2

C8.3 Nm^-2

D3.8Nm^-2

E3.0Nm^-2

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Question 26

neco 2001

The invisible part of the spectrum of white light consists of

AInfra-red and ultra-violet only

BInfra-red, ultra-violet and blue only

Cred, orange and green only

Dred and violet only

Eyellow and indigo only

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Question 27

waec 2001

Electrons passing through crystals are diffracted because they

Aare repelled by the atoms in the crystal

Bare attracted by the atoms in the crystals

Cpossess wave properties

Dare particles

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Question 28

waec 2001

A nitrogen nucleus bombarded with an alpha particle produces an oxygen nucleus and a proton. The nuclear reaction for this process is \(^4_2H + ^{14}_2N \to ^{17}_{8}O + ^1_1H + Q\). Which of the following statements about the reaction is not correct?

Athe bombardment results into a nucleus with greater proton number

Bit is an induced nuclear reaction

Cit is a natural radioactive decay

Dthe sum of the final nucleon numbers

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Question 29

waec 2001

Production of x-ray tube begins with

Aphoto electric emission

Bcollision of electrons

Cthermionic emission

Dfield emission of electrons

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Question 30

waec 2001

Calculate the reactance of the inductor in the circuit diagram shown above [\(\pi = \frac{22}{7}\)]

A132\(\Omega\)

B214\(\Omega\)

C264\(\Omega\)

D269\(\Omega\)

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Question 31

waec 2001

In the circuit diagram above. Calculate the energy stored in the inductor at resonance

A0.100J

B0.050J

C0.010J

D0.005J

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Question 32

waec 2001

The material used for constructing the core of an electromagnet is

Airon

Bcarbon

Ccopper

Dsteel

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Question 33

waec 2001

Which of the following statements about magnetic lines of force is not correct?

Aa magnnetic line of force is an imaginary line which the north pole of a magnet would describe if it is free to moves

Bmagnetic lines of force do not cross one another

Cmagnetic lines of force are closely packed together at neutral point

Dthe presence of magnetic lines of force in a region indicates the presence of a magnetic field

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Question 34

waec 2001

The Earth's magnetic equator passes through Jos in Nigeria. At Jos. the

Aangle of variation is zero

Bmagnetic declination is 90^o

Cangle of dip is zero

Dhorizontal component of the Earth's magnetic field is zero

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Question 35

waec 2001

An electric bulb is rated 60W, 220V. Calculate the resistance of its filament when it is operating normally

A296.7\(\Omega\)

B400.0\(\Omega\)

C512.2\(\Omega\)

D806.7\(\Omega\)

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Question 36

waec 2001

Three identical lamps each power 100W are connected in parallel across a potential difference of 250V. Calculate the current in the circuit

A7.5A

B2.5A

C1.2A

D0.8A

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Question 37

waec 2001

What is the total energy stored by the capacitors?

A2.0 x 10^-4J

B1.0 x 10^-4J

C9.0 x 10^-2J

D1.0 x 10^-2J

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Question 38

waec 2001

What is the effective capacitance in the circuit?

A2\(\mu F\)

B6\(\mu F\)

C18\(\mu F\)

D216\(\mu F\)

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Question 39

waec 2001

As the plates of a charged variable capacitor are moved closer together, the potential difference between them

Aincreased

Bdecrease

Cremains the same

Dis doubled

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Question 40

waec 2001

The magnitude of the gravitational force between two particles 0.10m apart is 10N. If the distance between them is increased to 0.20m, calculate the magnitude of the new force

A40.0N

B20.0N

C5.0N

D2.5N

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