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1,904 questions JAMB 2483 WAEC 1904 NECO 322 CUSTOM 10

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1,904 questions

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Question 631

waec 2000

The driver of a car moving with uniform speed of 40ms-1 observes a truck approaching from the opposite direction with a speed of 20ms-1. Calculate the speed of the car relative to that of the truck

A.5ms^-1

B2.0ms^-1

C20.0ms^-1

D60.0ms^-1

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Question 632

waec 2000

A ball bearing is gently released from rest and allowed to fall through a viscous fluid. Which of the following statements about the motion is correct?

Aits acceleration decreases before terminal velocity is attained

Bwhen terminal velocity is attained the acceleration of the fluid becomes zero

Cits velocity increases before terminal velocity is attained

Dthere is no resultant force on the ball before it attains terminal velocity

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Question 633

waec 2000

A wooden block of mass 1.6kg rests on a rough horizontal surface if the limiting friction force between the block and the surface is 8N. Calculate the coefficient of friction. (g = 10ms-2)

A0.6

B0.5

C0.3

D0.2

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Question 634

waec 2000

The apparent weight of a body wholly immersed in water is 32N and its weight in air is 96N. Calculate the volume of the body. (Density of water = 1000kgm-3, g = 10ms\(^{-2}\))

A8.9 x 10^-3m³

B6.4 x 10^-3m³

C3.2 x 10^-3m³

D3.0 x 10^-3m³

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Question 635

waec 2000

A uniform cylindrical hydrometer of mass 20g and cross sectional area 0.54cm2 floats upright in a liquid. If 25cm of its length is submerged, calculate the relative density of the liquid. (Density of water = 1 gcm-3)

A1.54

B1.48

C1.25

D0.80

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Question 636

waec 2000

An iron rod is moved from the earth to the moon. Which of the following properties of the rod would remain unchanged? i. mass ii. weight iii. relative density

Ai only

Bii only

Ciii only

Di and iii only

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Question 637

waec 2000

The diagram above illustrates three forces T\(_1\), T\(_2\) and 100N in equilibrium. Determine the magnitude of T\(_1\).

A100 tan 30^o

B\(\frac{100}{\cos 30^o}\)

C200 sin 30¹

D\(\frac{200}{tan 30^o}\)

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Question 638

waec 1999

Which of the following is not a safety precaution in a nuclear station?

ARadioactive materials are stored in glass casings

BRadioactive materials are handled with remote-controlled tongs

CTechnicians in nuclear stations wear radio-sensitive badges which are checked regularly.

DRadioactive materials are kept in thick-walled lead containers

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Question 639

waec 1999

Which of the following are the essential parts of an atomic bomb?

AUranium and neutrons

BRadium and polonium

CNitrogen and neutrons

Dranium and α - particles.

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Question 640

waec 1999

A sheet of paper is placed in the path of the following radiations: I. Alpha particles II. Beta particles III. Gamma rays. Which of the radiations will pass through the sheet of paper?

AI only

BII only

CI and II only

DII and III only

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Question 641

waec 1999

The half-life of a radioactive element is 5 Calculate its decay constant

A0.113s^-1

B0.436 s^-1

C0.139 s^-1

D0.193 s^-1.

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Question 642

waec 1999

The half-life of a radioactive substance is

Aits average life time

Bone-half the value of its decay constant.

Cthe length of time needed by the substance to decay completely

Dthe length of time during which the activity of the substance reduces by 50%.

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Question 643

waec 1999

A metal has work function of 4.375 eV Calculate its threshold frequency. (h = 6.6 x 10^-34Js; 1eV = 1.6 x 10^-19J)

A2.01 X 10¹⁵Hz

B1.06x10¹⁵Hz

C6.30 x 10¹⁴Hz

D1.60 x 10¹⁴Hz

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Question 644

waec 1999

I. All elements emit and absorb characteristic spectra. II. Spectral analysis is an important method of identifying environmental pollutants. III. The chemical composition of stars could be determined using spectral analysis. Which of the statements above are correct?

AI, II and III

BII and III only

CI and III only

DI and II only

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Question 645

waec 1999

Which of the transitions will produce the emission of highest frequency?

BIV

CIII

DII

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Question 646

waec 1999

The diagram above illustrates the energy transitions of five electrons of an atom. Which of the transitions will produce the emission of longest wavelength?

BII

CIII

DIV

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Question 647

waec 1999

Bohr’s atomic model proves most successful for the explanation of the. I. structure of the hydrogen atom; II. line spectra of the hydrogen atom; III. Multi-electron atoms. Which of the statements above is/are correct?

AI only

BII only

CI and II only

DI and III only

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Question 648

waec 1999

A point charge of magnitude 2μC is moved through a distance of 0.02 m against uniform field of intensity 25 Vm^-1 Calculate the work done on the charge

A5.0 x 10⁶J

B1.0 x10^-6J

C5.0 x10^-7J

D1.0 x 10^-2J

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Question 649

waec 1999

A 10 Ω coil takes 21 s to melt 10g of ice at 0ºC. Assuming no heat losses, determine the current in the coil. (Specific latent heat of fusion of ice = 336 Jg\(^{-1}\))

A16A

B5A

C4A

D3A

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Question 650

waec 1999

In a uniform electric field, the magnitude of the force on a charge of 0.2 C is 4N. Calculate the electric field intensity

A20 N C^-1

B8 N C^-1

C5 N C^-1

D2 N C^-1

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