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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 1861

jamb 1993

Which of the following devices may be used to step up the voltage in a d.c. circuit?

Aa step-up transformer

Ba d.c. generator

Ca wattmeter

Dan induction coil

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Question 1862

jamb 1993

A 40-W instrument has a resistance of 90\(\Omega\). On what voltage should it be operated normally?

A60V

B150V

C225V

D3600V

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Question 1863

jamb 1993

A parallel plate capacitor of area 10cm² in vacuum has a capacitance of 10^-2\(\mu\)F. What is the distance between the plates?(e = 9 x 10^-12fm)

A9 x 10^-13m

B9 x 10^-7m

C9 x 10^-3m

D9 x 10⁷m

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Question 1864

jamb 1993

A current of 100mA passes through a conductor for 2 minutes. The quantity of electricity transported is

A200C

B50C

C12C

D0.002C

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Question 1865

jamb 1993

The terminal voltage of a battery is 4.0V when supplying a current of 2.0A, and 2.0V when supplying a current of 3.0A. The internal resistance of the battery is

A0.5 \(\Omega\)

B1.0\(\Omega\)

C2.0\(\Omega\)

D4.0\(\Omega\)

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Question 1866

jamb 1993

A simple cell with mercury-amalgamated zinc electrode prevents

Alocal actions

Bpolarization

Cbuckling

Ddegradation

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Question 1867

jamb 1993

A current carrying conductor experiences a force when placed in a magnetic field because the

Aconductor is magnetized

Bmagnetic field of the current interacts with external magnetic field

Cforce is due to the motor principle

Delectric field of the current interacts with the external magnetic field

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Question 1868

jamb 1993

Which of the following correctly explains why soft iron is proffered to steel in electromagnets? i. soft iron is more readily magnetized than steel. ii. soft iron is more readily demagnetized than steel. iii. soft iron retains magnetism more than steel.

Ai only

Bii and iii only

Ci and ii only

Di, ii, and iii.

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Question 1869

jamb 1993

Which of the following correctly explain(s) why a green leaf appears green in bright day light? i. it absorbs only the green component of sunlight. ii. it absorbs all colour of sunlight except green. iii. it reflects only the green component of sunlight.

Ai only

Bii only

Ci and iii only

Dii and iii only

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Question 1870

jamb 1993

The property of the eye known as its power of accommodation is controlled by the

Apupil

Bvirteous humour

Ciris

Dciliary muscles

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Question 1871

jamb 1993

A beam of light is incident from air to water at an angle of 30^oC. Find the angle of refraction if the refractive index of water is \(\frac{4}{3}\)

A15^oC

B18^oC

C22^oC

D24^oC

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Question 1872

jamb 1993

Which of the following may be used to explain a mirage? i. layers of air near the road surface have varying refractive indices in hot weather. ii. road surfaces sometimes become good reflectors in hot weathers. iii. light from the sky can be reflected upwards after coming close to the road surface.

Aii only

Bii and iii only

Ci and iii only

Di, ii, and iii only

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Question 1873

jamb 1993

If the focal length of a camera lens is 20cm, the distance from the film at which the lens must be set to produce a sharp image of an object 100cm away is

A17cm

B20cm

C25cm

D100cm

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Question 1874

jamb 1993

Which of the following expressions gives the linear magnification produced by a concave mirror of radius of curvature r, if U and V are the object and image distances respectively?

A\(\frac{V}{r}\) - 1

B\(\frac{2V}{r}\) - 1

C\(\frac{U}{r}\) - 1

D\(\frac{2U}{r}\) - 1

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Question 1875

jamb 1993

Radio waves emitted from an antenna are picked up by a radar after reflection from an aircraft in 4 x 10\(^{-3}\)S. How far is the aircraft from the antenna? [c = 3 x 10\(^8\)ms\(^{-1}\) ]

A6.0 x 10\(^2\)km

B1.2 x 10³km

C3.0 x 10³km

D6.0 x 10 ⁵km

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Question 1876

jamb 1993

Which of the following waves can propagate through a vacuum?

AHigh velocity sound waves

BUltrasonic waves

CAcoustic waves

DInfra-red waves

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Question 1877

jamb 1993

Determine the distance between the consecutive antinodes XX if the wavelength is 60cm

A15cm

B30cm

C60cm

D120cm

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Question 1878

jamb 1993

The relationship between L and the wavelength I of the stationary wave is

A2L = \(\lambda\)

BL = \(\lambda\)

CL = \(\frac {\lambda}{3}\)

D4L = 3 \(\lambda\)

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Question 1879

jamb 1993

200g of water at 90°C is mixed with 100g of water at 30°C. What is the final temperature?

A50^oC

B60^oC

C70^oC

D80^oC

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Question 1880

jamb 1993

When the volume of a given mass of gas is halved and its temperature doubled, the pressure

Aremains constant

Bincreases by a factor of 4

Cincreases by a factor of 3

Ddecreases by a factor of 4

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