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4,719 questions JAMB 2483 WAEC 1904 NECO 322 CUSTOM 10

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4,719 questions

Question 1 of 20 4,719 total questions

Question 1111

jamb 2006

When an a.c. voltage is applied to a capacitor, no power is consumed because the current

Aleads the voltage by 90°

Blags behind the voltage by 90°

Cand voltage are in phase

Dand voltage are 180° out of phase

View Explanation & Discuss

Question 1112

jamb 2006

If the capacitance of a capacitor is C = \(\frac{(εA)}{d}\) which of the following parameters is varied when a variable capacitors is used for tuning radio sets?

Aconstant (ε) and area

Barea and distance.

Cconstant (ε) only

Ddistance only

View Explanation & Discuss

Question 1113

jamb 2006

An electric heater with a p.d of 240 V connected across its terminals has a total resistance of 960Ω. find the power rating of the heater.

A0.25 W

B4.00 W

C38.40W

D60.00W

View Explanation & Discuss

Question 1114

jamb 2006

The main purpose of the transformer in an a.c radio set is to?

Aincrease power to the radio

Bstep up the voltage

Cconvert energy from a.c to d.c

Dstep down the voltage

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Question 1115

jamb 2006

The production and type of charge of a body can only be accounted for by the?

Adeficiency or surplus of electrons

Bequibrium in protons and neutrons

Cdeficiency or surplus of protrons

Ddeficiency or surplus of neutrons

View Explanation & Discuss

Question 1116

jamb 2006

A cell of internal resistance r is connected to an external resistor R. The condition for maximum power transfer is?

AR < r

BR = r

CR = 2r

DR > r

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Question 1117

jamb 2006

A drop of petrol makes a finger colder than a drop of water would because?

Apetrol takes its latent heat of veporization from the finger

Bpetrol takes its latent heat of fusion from the finger

Cwater is more viscious than petrol

Dwater has higher surface tension dan petrol

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Question 1118

jamb 2006

what is likely to happen if the glass of a thermometer expands more upon heating than the liquid inside?

Athe glass will break

Bthe glass will shrink

Cthe liquid will rise up in the stem

Dthe liquid will go down in the stem

View Explanation & Discuss

Question 1119

jamb 2006

The thermos flask is designed to?

Aprevent heat loss or gain by conduction, convection and radiation

Bstore hot tea or water

Cprevent heat gain by conduction, convection and radiation

Dprevent heat lost by conduction, convention and radiation

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Question 1120

jamb 2006

An immersion heater rated 2.0A, 240V is used to boil water from temperature 52°c to 100°c. If the mass of the water is 2.5kg. determine the time taken to boil the water.

[specific heat capacity of water = 4.2 x 10³ jkg^-1 k^-1]

A1.05 x 10³s

B1.05 x 10⁵s

C1.05 x 10²s

D1.05 x 10⁴s

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Question 1121

jamb 2006

The thermometric property of a constant volume thermometer is?

Achange in volume

Bdifferential expanssion

Cchange in pressure

Dchange in length

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Question 1122

jamb 2006

If the relative density of gold is 19.2, the volume of 2.4kg of gold is?

A8.00 x 10^-3 m³

B1.25 x 10^-4 m³

C1.92 x 10^-4 m³

D4.61 x 10^-3 m³

View Explanation & Discuss

Question 1123

jamb 2006

At low humidity in an environment, the human skin is usually?

Adamp and rough

Bdamp and smooth

Cdry and rough

Ddry and smooth

View Explanation & Discuss

Question 1124

jamb 2006

A uniform solid cube material 10cm on each side of mass 700g is submerged in water. which of the following best described the behavior of the cube water?

Athe cube will melt after a period of time

Bthe cube will float

Cthe cube will sink in water

Dthe cube will rest at an equilibrium position in water

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Question 1125

neco 2005

The most suitable instrument for measuring the diameter of a thin wire is a

Ameter rule

Bmicrometer screw gauge

Cpair of dividers

Dpair of engineer’s calipers

Evenire calipers

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Question 1126

neco 2005

The wave theory of light does not explain photoelectricity because

Alight waves carry little energy

Bparticles cannot be emitted by waves

Cthe frequency of light waves too high

Dthere is a threshold wavelength for electron emission

Ethe wavelength of Light waves is too short.

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Question 1127

neco 2005

The amplitude of oscillation of a simple pendulum bob diminishes slowly because

Aenergy is applied by some external agencies

Bfrictional forces dissipate the energy of motion

Cthe frequency of oscillation increases with the mass of the bob

Dthe frequency of oscillation varies with time

Ethe period of oscillation varies with time.

View Explanation & Discuss

Question 1128

neco 2005

Notes of the same frequency sounded on a guitar and trumpet may differ in

I. loudness
II. Pitch
III. quality Which of the statements above is correct?

AI only

BII only

CIII only

DI and II only

EI, II and III

View Explanation & Discuss

Question 1129

neco 2005

The motion of the wheel of a bicycle moving on a smooth straight road is

Aoscillatory and random

Boscillatory and translational

Crotational and oscillatory

Drotational and random

Erotational and translational

View Explanation & Discuss

Question 1130

neco 2005

Which of the following is NOT a component of a slide projector?

AConcave mirror

BCondenser

CConvex mirror

Dlight source

EScreen.

View Explanation & Discuss

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