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49 questions JAMB 2483 WAEC 1904 NECO 322 CUSTOM 10

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Past Questions

49 questions

Question 1 of 20 49 total questions

Question 1

jamb 2010

The radioisotope \( ^{235}_{92}U \) decays by emitting two alpha particles, three beta particles and a gamma ray. What is the mass and atomic number of the resulting element?

A215 and 88

B91 and 227

C227 and 91

D92 and 238

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Question 2

jamb 2010

An object is weighed at different locations on the Earth. What will be the right observation?

ABoth the mass and weight vary

BThe weight is constant while the mass varies

CThe mass is constant while the weight varies

DBoth the mass and weight are constant

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Question 3

jamb 2010

The process whereby a substance changes from a solid to liquid when heat is applied, is called?

AEvaporation

BVaporization

CFission

DFusion

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Question 4

jamb 2010

In Faradays law of electrolysis, a graph of the mass deposited against the quantity of electricity is plotted. The slope of the graph gives?

Athe energy released

Bthe electrochemical equivalent

Cthe current flowing

Dthe charge released

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Question 5

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 6

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 7

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 8

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 9

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 10

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 11

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 12

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 13

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 14

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 15

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 16

jamb 2010

Which of the following is a pure semiconductor?

Acarbon

Bsilicon

Ctransistor

Dphosphorus

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Question 17

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 18

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 19

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 20

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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