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4,719 questions

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Question 1261

jamb 2004

The particle and wave nature of matter are demonstrated in the equation

Aλ = ^hc/_E

Bλ = ^h/_P

Cλ = ^c/_f

Dλ = 2 d sin θ

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Question 1262

jamb 2004

A moving coil galvanometer has a full-scale deflection of 3A equivalent to 30o deflection. The sensitivity of the instrument is

A33.0

B0.1

C90.0

D10.0

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Question 1263

jamb 2004

X rays can be used in the study of crystal structure because they

Ahave a very long-reaching wavelength

Bhave extremely short wavelength

Care invisible

Dare very fast

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Question 1264

jamb 2004

For semi conductor to have negative temperature coefficient of resistance implies that

Atheir resistance decrease with temperature

BThe resistance increase with temperature

Ctheir resistance is constantly changing with temperature

Dthey have electrons and holes at high temperature

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Question 1265

jamb 2004

An a.c circuit of e.m.f 12V has a resistor of resistance 8Ω connected in series to an inductor of inductive reactance 16Ω and a capacitor capacitive reactance 10Ω. The current flow in the circuit is

A1.4A

B1.2A

C12.0A

D14.0A

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Question 1266

jamb 2004

A radioisotope has a decay constant of 10\(^{-7}\)s\(^{-1}\). The average life of the radioisotope is

A1.00 x 10⁷s

B6.93 x 10⁶s

C1.00 x 10^-7s

D6.93 x 10⁷s

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Question 1267

jamb 2004

A generator manufacturing company was contracted to produce an a.c dynamo but inadvertently produced a d.c dynamo. To correct this error, the

Aarmature coil should be made of silver

Bcommutator should be replaced with slip ring

Ccommutator should be replaced with split rings

Darmature coil should be made of aluminium

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Question 1268

neco 2003

A sheet of white paper viewed through blue glass appears blue because

Ablue is a primary colour

Bthe glass absorbs all colours except the blue colour

Cthe glass reflects blue colour

Dthe paper reflects blue colour only

Ewhite light is easily absorbed by the glass

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Question 1269

neco 2003

Which of the following statements is NOT true?

AA lead-acid accumulator can deliver a large current because of its very large internal resistance.

BA secondary cell can be recharged.

CAs a lead-acid accumulator is being charged, the density of the acid in it increases.

DThe chemical action in a primary cell is irreversible.

EThe conventional current in a circuit rlows from the positive to the negative terminal of the battery.

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Question 1270

neco 2003

The volume of a given mass of gas is 40cm³ at 27° C. What is its volume at 90° C if its pressure remains constant?

A32.84cm³

B40.02cm³

C48.40cm³

D57.44cm³

E72.84cm³

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Question 1271

neco 2003

Water in an open container boils at a lower temperature when heated at the top of a mountain than at sea-level because at the top of a mountain

Apressure is increased

Bpressure is reduced

Cthe rays of the sun add more heat to the water

Dthe saturation vapour pressure of water is higher than at sea-level

Ethe temperature is lower than at sea-level

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Question 1272

neco 2003

J.J. Thomson’s model of the atom was abandoned because

Ait could not explain the scattering of alpha particles

Bit did not account for the neutron

Cit did not account for the size of the atom

Dit was known as plum-pudding model

Ethe model was not similar to any observable phenomena

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Question 1273

neco 2003

An evidence of the wave nature of matter is

ABrowniam motion

BCompton effect

Cdiffraction

Ddiffusion

Ephoto electricity

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Question 1274

neco 2003

Which of the following properties is NOT exhibited by sound waves?

ADiffraction

Binterference

CPolarisation

DReflection

ERefraction

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Question 1275

neco 2003

An object is placed 30 cm in front of a concave mirror of focal length 20cm. Calculate the distance between the object and the image.

A90cm

B40cm

C30cm

D20cm

E10cm

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Question 1276

neco 2003

Lenz’s law of electromagnetic induction states that

Aa force is exerted on a current carrying conductor in a magnetic field

Bthe induced current in a conductor is in such a direction as to oppose the change producing it

Cthe magnitude of the induced electromotive force in a circuit is proportional to the rate of change of the number of lines of force linking the circuit

Dthe magnitude of the induced electromotive force is proportional to the current producing the magnetic flux

Ewhenever there is a change in the magnetic flux linked with the circuit, an electromotive is induced

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Question 1277

neco 2003

Which of the following statement(s) is/are correct about the isotopes of an elements? They have the same

I. chemical properties
II. nucleon number
III proton number

AI only

BII only

CI and II only

DI and III only

EI,II and III

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Question 1278

neco 2003

Which of the following statement(s) is/are correct?

I. When a liquid expands its density falls
II. When a mercury-in-glass thermometer is placed in a hot liquid, the mercury level first descends and then rises.
III. The apparent expansion of a liquid is greater than its real expansion.

AI only

BII only

CIII only

DI and II only

EII and III only

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Question 1279

neco 2003

A ball of mass m moving at velocity u collides with another ball of equal mass at rest. If the two balls move off together after the impact, calculate their common velocity.

A\(\frac{u}{v}\)

B\(\frac{u}{2}\)

D2u

E\(\frac{u}{m}\)

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Question 1280

neco 2003

A body is launched from the earth’s surface, of radius R, so that it just escapes from the gravitational influence of the earth; If the gravitational constant is G and the mass of the earth is M, what is the escape velocity of the boby.

A\(\sqrt{2GM}\) ÷ R

B\(\frac{\sqrt{2GM}}{R}\)

C\(\frac{\sqrt{2G}}{MR}\)

D\(\sqrt{2GMR}\)

E\(\frac{\sqrt{R}}{2GM}\)

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