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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 541

jamb 2008

An object of heights 5 cm is placed at 20 cm from a concave mirror of focal length 10 cm. the image height is?

A20 cm

B15 cm

C10 cm

D5 cm

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Question 542

jamb 2008

An object of height 4cm is placed in front of a cuboid pinhole camera of size 6 cm. if the image formed is 2 cm high, how far is the object from the pinhole?

A3.0 cm

B8.0 cm

C12.0 cm

D16.0 cm

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Question 543

jamb 2008

I. Total internal reflection of light.
II. Conservation of light energy.
III. Relative motion of the earth, sun and moon.
IV. Rectilinear propagation of light.
which of the above is a phenomenon of total solar eclipse?

AI and IV only

BII and IV only

CI and III only

DIII and IV only

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Question 544

jamb 2008

The fundamental property of a propagating wave which depends only on the source and not the medium of propagation is the?

Awavelength

Bharmonics

Cfrequency

Dvelocity

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Question 545

jamb 2008

Given the progressive wave equation y = 5 sin (2000 πt - 0.4x), calculate wave length

A12.4 m

B15.7 m

C17.5 m

D18.6 m

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Question 546

jamb 2008

In a good thermos flask, heat loss is reduced through the following features EXCEPT?

Athe lens surface

Bthe insulating cork

Csilvered walls

Dthe cork lid

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Question 547

jamb 2008

If the partial pressure of water vapour at 27°C is 18 mm Hg and the saturated vapour pressure of the atmosphere at the same temperature is 24 mm Hg, the relative humidity at this temperature is?

A25%

B33%

C75%

D82%

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Question 548

jamb 2008

A block of aluminum is heated electrically by a 25 W heater. if the temperature rises by 10°C in 5 minutes, the heat capacity of the aluminum is?

A850 JK^-1

B750 JK^-1

C650 JK^-1

D500 JK^-1

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Question 549

jamb 2008

A sealed flask contains 600cm3 of air at 27°C and is heated to 35°C at constant pressure. The new volume is?

A508 cm³

B516 cm³

C608 cm³

D616 cm³

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Question 550

jamb 2008

During summer, the balance wheel of a clock expands.what effect does this have on the accuracy of the clock?

Athe clock gians time

Bthe accuracy of the clock is not affected

Cthe clock losses time

Dthe clock stops working

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Question 551

jamb 2008

The thermometric properties of a thermocouple is the change in?

Aequivalent resistance

Belectromotive force

Ccolour

Dpressure

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Question 552

jamb 2008

An empty density bottle weighs 2 N. if it weighs 5 N when filled with water and 4 N when filled with olive oil, the relative density of olive oil is?

A(1)/3

B(2)/3

C(1)/5

D(2)/5

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Question 553

jamb 2008

When cold water is poured on a can containing hot water, the can collapses because the?

Asteam condeses and occupies the partial vacuum in the can

Bexternal air pressure counter balances the pressure within the can

Csteam expands to occupy the vacuum remaining in the can

Dexternal pressure becomes greater than the pressure within the can.

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Question 554

jamb 2008

In the hare's apparatus, water rises to a height of 26.5 cm in one limb. if a liquid rises to a height of 20.4 cm in the other limb, what is the relative density of the liquid?

A0.8

B1.1

C1.2

D1.3

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Question 555

jamb 2008

A spring of force constant 500 Nm\(^{-1}\) is compressed such that its length shortens by 5cm. The energy stored in the spring is?

A0.625 J

B6.250 J

C62.500 J

D625.000 J

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Question 556

jamb 2008

A motorcycle of mass 100kg moves round in a circle of radius 10m with a velocity of 5 ms\(^{-1}\). find the coefficient of friction between the road and the tyres.

A25.00

B2.50

C0.50

D0.25

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Question 557

jamb 2008

Counting of currency notes with moist fingers is based on the principles of?

Adiffusion

Bcohesion

Cadhesion

Dviscosity

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Question 558

jamb 2008

If a body mass 5kg is thrown vertically upwards with velocity u,at what height will the potential energy equal to the kinetic energy?

Ah =(u)²/g

Bh = (u)²/4g

Ch = (2u)²/g

Dh = (u)²/2g

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Question 559

jamb 2008

What is the frequency of vibration if the balance wheel of a wrist watch makes 90 revolutions in 25 s?

A0.01 Hz

B0.04 Hz

C2.27 Hz

D3.60 Hz

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Question 560

jamb 2008

I. All the three forces must be concurrent.
II. The upward force is equal to the downward force.
III. The algebraic sum of the moment about any point must be zero.

which of the above conditions must hold for a body acted upon by a system of three coplanar forces equilibrium?

AI and II only

BI and III only

CII and III only

DI, II and III

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