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1,904 questions

Question 1 of 20 1,904 total questions

Question 611

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 612

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 613

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 614

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 615

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 616

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 617

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 618

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 619

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 620

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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Question 621

waec 2000

The region around a magnet in which the magnetic influence is experienced is called

Amagnetic flux

Bmagnetic field

Cmagnetic meridian

Dmagnetic declination

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Question 622

waec 2000

An immersion heater is rated 120W. How long does it take the heater to raise the temperature of 1.2kg of water by 15oC. (Assuming heat lost to the surrounding is negligible. Specific heat capacity of water = 4200 Jkg-1K-1C)

A65.0 minutes

B60.0 minutes

C52.5 minutes

D10.5 minutes

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Question 623

waec 2000

In the diagram above, the current passing through the 6\(\Omega\) resistor is 1.5A. Calculate the current in the 3\(\Omega\) resistor

A1.20A

B0.90A

C0.75A

D0.60A

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Question 624

waec 2000

The capacitance of a parallel-plate capacitor is increased by making the area of the plates

Asmall and their seperation large

Blarge and their seperation small

Cand their seperation small

Dand their seperation equal

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Question 625

waec 2000

An object is situated within the Earth's gravitational field. Which of the following factor does not affect the acceleration of free fall g?

Athe distance of the object from the centre of the earth

Bthe latitude of the earth on which the object is situated

Crotation of the earth

Dthe mass of the object

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Question 626

waec 2000

the factor which enables the ear to distinguish between a note played on different instruments is the

Apitch

Bspeed

Charmonics

Dloudness

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Question 627

waec 2000

loudness increases as a vibrating tuning fork is brought nearer the end of a pipe containing air column due to

Aresonance

Becho

Creverberation

Ddiffraction

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Question 628

waec 2000

A turning fork of frequency 600Hz is sounded over a closed resonance tube. If the first and second resonant positions are 0.130m and 0.413m respectively, calculate the speed of sound in air

A508.4ms^-1

B480.0ms^-1

C339.6ms^-1

D169.8ms^-1

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Question 629

waec 2000

In which of the following media does sound travel faster?

Awater

Bbrass

Cair

Dwood

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Question 630

waec 2000

When white light passes through a triangular glass prism, there is dispersion because of

Adiffraction of light

Bpolarisation of light

Cthe difference in speed of the components of light

Dthe interference of light waves in glass

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