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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 1541

jamb 2000

A radio is operated by eight cells each of e.m.f. 2.0V connected in series. If two of the cells are wrongly connected, the net e.m.f. of the radio is

A8V

B10V

C12V

D16V

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Question 1542

jamb 2000

The main reason for making the cover of a vacuum flask airtight is to prevent heat loss by

Aconvection

Bconduction

Cradiation

Devaporation

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Question 1543

jamb 2000

A metal of mass 0.5kg is heated to 100°C and then transferred to a well-lagged calorimeter of heat capacity 80JK^-1 containing water of heat capacity 420JK^-1 at 15°C. If the final steady temperature of the mixture is 25°C, find the specific heat capacity of the metal.

A877Jkg^-1K^-1

B286Jkg^-1K^-1

C133Jkg^-1K^-1

D92Jkg^-1K^-1

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Question 1544

jamb 2000

One end of a long wire is fixed while a vibrator is attached to the other end. When the vibrator is energized, the types of waves generated in the wire are

Astationary and longitudinal

Bstationary and transverse

Cprogressive and transverse

Dprogressive and longitudinal

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Question 1545

jamb 2000

Dry
Day 1 - 30°C | Day 2 - 29°C | Day 3 - 25°C

Wet
Day 1 - 22°C | Day 2 - 22°C | Day 3 - 21°C

The reading above are for three consecutive days from a wet and dry bulb hygrometer. It can be concluded that the relative humidity for the three days

Adecreased steadily

Bremained unchanged

Cincreased steadily

Dwas least on Day 1

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Question 1546

jamb 2000

A thin wire with heavy weights attached to both ends is hung over a block of ice resting on two supports. If the wire cuts through the ice block while the block remains solid behind the wire, the process is called

Acondensation

Bsublimation

Cregelation

Dfusion

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Question 1547

jamb 2000

A boy observes a piece of stone at the bottom of a river 6.0m deep. If he looks from the surface of the river, what is the apparent distance of the stone from him? [Refractive Index of Water = 4/3]

A8.0m

B5.5m

C5.0m

D4.5m

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Question 1548

jamb 2000

I. Coherence
II. Same frequency
III. Same wavelength
IV. Same Intensity

Which of the conditions above are necessary to produce interference fringes?

AI and III

BI, II and IV

CI, II and III

DII and III

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Question 1549

jamb 2000

A quantity of water at 0°C is heated to about 30°C. At each degree rise in temperature, its density will

Arise steadily

Bfall steadily

Cfall then rise

Drise then fall

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Question 1550

jamb 2000

Total internal reflection occurs when light moves from?

Aa dense medium to a less dense medium

Bair to water

Cwater to glass

Da less dense to a dense medium

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Question 1551

jamb 2000

I. The frictional force is independent of the area of the surfaces in conduct
II. The frictional force depends on the nature of the surfaces in contact
III. The frictional force depends on the speed of sliding
IV. The frictional force is directly proportional to the normal reaction.

Which combination of the above is true of sliding friction?

AI, III and IV

BI, II and IV

CI, II and III

DII, III and IV

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Question 1552

jamb 2000

A rope is being used to pull a mass of 10kg vertically upward. Determine the tension in the rope if, starting from rest, the mass acquires a velocity of 4ms\(^{-1}\) in 8s [g = 10ms\(^{-2}\)]

A5N

B50N

C95N

D105N

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Question 1553

jamb 2000

A stream is flowing at 0.75ms\(^{-1}\) and a boat heading perpendicular for the stream landed at the opposite bank at an angle of 30°. Calculate the velocity of the boat.

A1.50ms^-1

B1.00ms^-1

C0.86ms^-1

D0.65ms^-1

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Question 1554

jamb 2000

A catapult used to hold a stone of mass 500g is extended by 20cm with an applied force F. If the stone leaves with a velocity of 40m/s, the value of F is

A4.0 x 10²N

B2.0 x 10³N

C4.0 x 10³N

D4.0 x 10⁴N

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Question 1555

jamb 2000

If the force and the velocity on a system are each reduced simultaneously by half, the power of the system is

Adoubled

Breduced to a quarter

Creduced by half

Dconstant

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Question 1556

jamb 2000

At a fixed point below a liquid surface, the pressure downwards is P1 and pressure upwards is P2. It can be deduced that?

AP₁ > P₂

BP₁ ≥ P₂

CP₁ < P₂

DP₁ = P₂

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Question 1557

jamb 2000

The velocity ratio of a machine is 5 and its efficiency is 75%. What effort would be needed to lift a load of 150N with the machine?

A20N

B30N

C40N

D50N

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Question 1558

jamb 2000

I. Its velocity is constant
II. No work is done on the body
III. It has constant acceleration directed away from the centre
IV. The centripetal force is directed towards the centre

Which combination of the above is true of a body moving with constant speed in a circular track?

AII and IV

BI and IV

CII and III

DI and III

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Question 1559

jamb 2000

When a ship sails from salt water into fresh water, the fraction of its volume above the water surface will

Aincrease

Bdecrease

Cremain the same

Dincrease then decrease

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Question 1560

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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