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4,719 questions

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Question 1041

waec 2007

Which of the following statements about solid friction are correct? It i. is a force ii. occurs between the surfaces of two bodies in contact iii. depends on the area in contact

Ai and ii only

Bi adnd iii only

Cii and iii only

Di, ii and iii

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Question 1042

waec 2007

A liquid of volume 2.00 m3 and density 1.00 x 103 is mixed with 3.00 m3 of another liquid of density 8.00 x 103kg m-3. Calculate the density of the mixture [Assuming there is no chemical reaction]

A5.20 x 10² kg m^-2

B1.13 x 10³ kg m^-3

C8.80 x 10² kg m^-3

D5.20 x 10³ kg m^-3

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Question 1043

waec 2007

Which of the following physical quantities is correctly paired with it's corresponding S.I unit?

Adensity[kg m³]

Bpower[Js^-1]

Cspecific latent heat [J kg^-1K^-1

DPressure [Nm^-1]

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Question 1044

waec 2007

Which of the following observations is not an effect of surface tension?

Adroplets of water dripping slowly from a tap

Bmercury spilled on a clean glass plate forms spherical droplets

Can indect walking across the surface of a pond

Dwater flowing out more easily then engine oil from a container

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Question 1045

jamb 2007

A photon of wavelength 6.0 x 10\(^{-7}\) m behaves like a particle of a certain mass. The value of that mass is [h = 6.63 x 10\(^{-34}\) Js, c = 3.0 x 10\(^8\) ms\(^{-1}\)]

A3.5 x 10\(^{-36}\)kg

B2.2 x 10\(^{-35}\)kg

C1.1 x 10\(^{-35}\)kg

D2.2 x 10\(^{-7}\) kg

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Question 1046

jamb 2007

A radioactive substance has a half life of 20 days. What fraction of the original radioactive nuclei will remain after 80 days?

A\( \frac{1}{32} \)

B\( \frac{1}{16} \)

C\( \frac{1}{8} \)

D\( \frac{1}{4} \)

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Question 1047

jamb 2007

A 120V, 60W lamp is to be operated on 220V ac supply mains. calculate the value of non inductive resistance that would be required to ensure that the lamp is run on correct value

A100Ω

B200Ω

C300Ω

D500Ω

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Question 1048

jamb 2007

Lenz's law is a law of conservation of

Aelectric charge

Belectric current

CEnergy

DMomentum

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Question 1049

jamb 2007

Two long parallel wires X and Y carry currents 3A and 5A each. if the force experienced by unit length is 5 x 10-5N. the force per unit length experienced by wire Y is

A3 x 10^-5

B3 x 10^-6

C5 x 10⁵

D5 x 10^-5

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Question 1050

jamb 2007

The instrument that measures both ac and dc is called

AA current balance

Ba moving coil ammenter

Ca moving iron ammeter

Dan inverter

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Question 1051

jamb 2007

A 40KW electric cable was used to transmit electricity through a resistor of resistance 2.00Ω at 800V. The power loss as internal energy is

A4.0 x 10²W

B5.0 x 10²W

C4.0 x 10³W

D5.0 x 10³W

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Question 1052

jamb 2007

A conductor has a diameter of 1.00mm and length of 2.00m. If the resistance of the material is 0.1Ω, the resistivity is

A2.55 * 10⁵ Ωm

B2.55 * 10³ Ωm

C3.93 * 10^-6 Ωm

D3.93 * 10^-8 Ωm

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Question 1053

jamb 2007

If two charged plates are maintained at a potential difference of 3 kv, the work done in taking a charge of 600µc across the field is

A0.8j

B1.8j

C9.0j

D18.0j

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Question 1054

jamb 2007

The difference observed in solids, liquids and gases can be accounted for by

AThe different molecules in each of them

BThe spaces and forces acting between the molecules

CThier melting points

DTheir relative massess

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Question 1055

jamb 2007

Which of the following gas laws is equivalent to the work done?

ABoyle' law

BCharles law

CPressure law

Dvan der Waal's law

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Question 1056

jamb 2007

A string of length 4m is extended by 0.02m when a load of 0.4kg is suspended at its end. What will be the length of the string when the applied force is 15N?

A4.05m

B4.08m

C5.05m

D6.08m

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Question 1057

jamb 2007

A particle of weight 120N is placed on a plane inclined at 300 to the horizontal. If the plane has an efficiency of 60% to the floor what is the force required to push the weight uniformly up the plane?

A50N

B100N

C175N

D210N

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Question 1058

jamb 2007

118.8cm2 surface of the copper cathode of a voltameter is to be coated with 10-6m thick copper of density 9 x 103kgm-3. How long will the process run with 10A constant current?
[3.3 x 10-7kgC-1]

A5.4 min

B10.8 min

C15.0 min

D20.0 min

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Question 1059

jamb 2007

from the diagram above, the inductive reactance and the resistance R are respectively

A50Ω and 45Ω

B25Ω and 51Ω

C20Ω and 50Ω

D10Ω and 50Ω

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Question 1060

jamb 2007

During the nuclear reaction described by

\(^{235}_{92}\)W → \(^{235}_{93}\)X → \(^{231}_{91}\)Y

The particles emitted are respectively

Aα and α

Bα and β

Cβ and β

Dβ and α

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