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2,483 questions JAMB 2483 WAEC 1904 NECO 322 CUSTOM 10

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2,483 questions

Question 1 of 20 2,483 total questions

Question 481

jamb 2010

In the diagram above, if the south-poles of two magnets strokes steel bar, the polarities at T and V will respectively be

Asouth and north

Bnorth and south

Cnorth and north

Dsouth and south

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Question 482

jamb 2010

In the diagram above, a 200 W bulb is lighted by a 240 V a.c mains supply. If 1kwh is sold at N40, the cost of keeping the bulb lighted for a day is?

AN1,920.00

BN192.00

CN19.20

DN1.92

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Question 483

jamb 2010

Three 4Ω resistors connected in parallel have a potential difference of 16 V applied across them. What is the total current in the circuit?

A14 A

B12 A

C10 A

D8 A

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Question 484

jamb 2010

The diagram above shows a balanced metre bridge, the value of x is

A75.0 cm

B66.7 cm

C33.3 cm

D25.0 cm

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Question 485

jamb 2010

A cell of e.m.f 12V and internal resistance 4Ω is connected to an external resistor of resistance 2Ω. Find the current flow.

A5 A

B4 A

C3 A

D2 A

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Question 486

jamb 2010

Three capacitors of capacitance 2μF, 4μFand 8μF are connected in parallel and a P.D of 6V is maintained across each capacitor, the total energy stored is?

A2.52 x 10^-6J

B6.90 x 10^-6J

C2.52 x 10^-4J

D6.90 x 10^-4J

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Question 487

jamb 2010

THe velocity of sound in air at 16oC is 340ms-1. What will it be when the pressure is doubled and its temperature raised to 127ºC?

A400 ms^-1

B4,000 ms^-1

C8,000 ms^-1

D160,000 ms^-1

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Question 488

jamb 2010

Two metals P and Q of length l1 and l2 are heated through the same temperature difference. If the ratio of the linear expansivities of P to Q is 2:3 and the ratio of lengths is 3:4. What is the ratio of increase in length of P to Q?

A7:5

B5:7

C1:2

D2:1

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Question 489

jamb 2010

A bob of weight 0.1 N hangs from a massless string of length 50 cm. A variable horizontal force which increase from zero is applied to pull the bob until the string makes an angle of 60o with the vertical. The work done is?

A0.500 J

B0.250 J

C0.050 J

D0.025 J

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Question 490

jamb 2010

The diagram above represents balls in an undulating surface. Which of the following option represents positions of stable equilibrium?

AIII, IV and VIII

BII, V and VIII

CIII, VI and IX

DI, IV and VII

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Question 491

jamb 2010

The diagram above shows a velocity - time graph. The statement that is true about this motion is that the car?

Ahas no acceleration between point F and G

Bdecelerates between F and H

Chas a constant soeed between points E and F

DAccelerates between points F and G

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Question 492

jamb 2010

Which of the following is a pure semiconductor?

Acarbon

Bsilicon

Ctransistor

Dphosphorus

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Question 493

jamb 2010

Transistors are used for the?

Arectification of signals

Bconversion of a.c to d.c

Camplification of signals

Dconversion of d.c to a.c

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Question 494

jamb 2010

The ground state energy for the hydrogen atom is 5.44 x 10\(^{-19}\)J. If an electron drops from zero energy to the ground state, calculate the frequency of the emitted radiation. [h = 6.6 x 10\(^{-34}\) Js]

A5.0 x 10¹⁶ Hz

B2.0 x 10¹⁶ Hz

C5.0 x 10¹⁵ Hz

D2.0 x 10¹⁵ Hz

ENo correct option

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Question 495

jamb 2010

In a discharge tube, most of the gas is pumped out so that electricity is conducted at?

Alow voltage

Bsteady voltage

Chigh pressure

Dlow pressure

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Question 496

jamb 2010

In alternating current circuit at resonance, the angle of lead or lag is?

Aπ°

B(π)/2°

C(π)/3°

D0°

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Question 497

jamb 2010

Two inductors of inductance 5 mll and 15 mll are connected in series and a current of 5A flows through them. the total energy stored in the inductor is?

A500.0J

B250.0J

C62.5J

D50.0J

Eno correct option

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Question 498

jamb 2010

A galvanometer with full-scale deflection of 10 mA is to be converted to a voltmeter with full-scale deflection of 5v. if a series resistance of 498Ω is used for the conversion, the resistance of the galvanometer is ?

A1Ω

B2Ω

C5Ω

D10Ω

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Question 499

jamb 2010

Power supply is transmitted at a very high voltage and low current in order to?

Amake pass through the trasformers

Bincrease the power supply

Cmake it travel fast

Dprevent overheating of the coil

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Question 500

jamb 2010

When a positively charged rod is brought nearer the cap of a positively charged electroscope, the leaves divergence will?

Abe induced

Bconverge

Cdiverge

Dremain constant

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