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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 2341

jamb 1978

The angular dispersion of a prism depends on

Athe index of refraction only

Bthe angle of incidence as well as the index of refraction

Cthe angle of incidence only

Dthe thickness of the prism

Ethe prism angle

View Explanation & Discuss

Question 2342

jamb 1978

An object is positioned between two plane mirrors inclined at right angles to each other. The object is 1 unit distance from each mirror, the number of images formed is

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Question 2343

jamb 1978

The visible part of light consists of the following colours

Ared, indigo, infra-red, violet, yellow, green and blue

Bred, green, blue, violet, indigo, orange and yellow

Cblue, ultra-violet, infra-red, red, yellow, indigo, violet,green and orange

Dinfra-red and ultra-violet

Ered, orange, yellow, green, blue, indigo and infra-red

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Question 2344

jamb 1978

an object 1cm high placed on the axis 15cm from a converging lens forms an image 30cm from the lens. The size of the image is

A0.5cm

B1.5cm

C3cm

D2.5m

E2cm

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Question 2345

jamb 1978

A herdsman yelling out to fellow herdsman heard his voice reflected by cliff 4s later. What is the velocity of sound in air if the cliff is 680m away?

A170ms^-1

B136ms^-1

C340ms^-1

D680ms^-1

E510ms^-1

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Question 2346

jamb 1978

The boys are communicating with each other by stretching a string passing through a hole punched in the bottom of each of two tin cans. The physical principle employed is that sound travels

Amainly through air

Bfainter in stretched string

Cfaster through gases than in solids and liquids

Dwith greater ease through a string than in air

Enone of the above is correct

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Question 2347

jamb 1978

a guitar string is 75cm long. the wavelength of its fundamental note is

A75cm

B150cm

C37.5cm

D112cm

E50cm

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Question 2348

jamb 1978

An electric charge could be transmitted through

Awood, rubber and stone

Bpaper, clay and plastic

Cglass, acid and cloth

DThe human body, water and metals

Eall of the above

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Question 2349

jamb 1978

Every house supplied with electricity is provided with a box of fuses so that

Athe consumption of electricity can be recorded

Bpeople residing in the house will not have an electric shock if they touch a live wire

Cthe total current drawn from the mains can be limited

Dthe voltage supply can be stabilized

Eit serves as a standby supply when there is a power failure

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Question 2350

jamb 1978

The electric supply from Kainji Dam is transmitted at high voltages of the order hundreds of kilovolts but is converted to domestic use of about 220 volts by

Acommutators

Btransistors

Cvalves and diodes

Drectifiers

Etransformers

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Question 2351

jamb 1978

A potential difference of 6v is used to produce a current of 5A for 200s through a heating coil. The heat produced is

A4800 cal

B6000 cal

C2400J

D240k cal

E6000J

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Question 2352

jamb 1978

Why is it impossible for the lines of force of an electric field to cross one another?

Alike charges repel each other

Ba charged particle is deflected by an eletric field

Clike charges are arranged on the same line of force

Da positively charged particle can travel in only one direction at any time

Enone of these is correct

View Explanation & Discuss

Question 2353

jamb 1978

On an a.c generator, which of the following does not apply?

Afield magnet

Bcommutator

Carmature

Dslip rings

Ecarbon brushes

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Question 2354

jamb 1978

In a D.C. circuit, a 10 microfarad (mf) capacitor is placed in series with a 10 0hm resistor. The total resistance of the combination is

A10 ohms

B1 ohms

Czero

D20 ohms

Einfinite

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Question 2355

jamb 1978

In order to convert a galvanometer into an ammeter

Aa low resistance shunt is connected in parallel

Ba low resistance shunt is connected in series

Ca medium resistance shunt is connected in series

Da high resistance shunt is connected in parallel

Ea high resistance shunt is connected in series

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Question 2356

jamb 1978

A magnet is moved through a coil of wire. The e.m.f. produced in the wire depends on

Athe number of turns in the coil

Bthe strength of the magnet

Cthe speed at which the magnet is moved

Dall of the above

Enone of the above

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Question 2357

jamb 1978

If NEPA charges 5k per kWhr, what is the cost of operating for 24 hours a lamp required 1A on a 200v line?

A24k

B55k

C40k

D26k

E32k

View Explanation & Discuss

Question 2358

jamb 1978

Three 5 ohms resistors connected in parallel have a potential difference of 60v. applied across the combination. The current in each resistor is

A4A

B36A

C12A

D24A

E10A

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Question 2359

jamb 1978

Two resistors R1 and R2 are connected in parallel, R2 being greater than R1. The combined resistance is

Aless than R₁

Bgreater than R₂

Cthe sum of R₁ and R₂

Dthe difference of R₂ and R₁

Egreater thanR₁ but less than R₂

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Question 2360

jamb 1978

The heat from the sun reaches the earth by the process

Ainsulation

Bprecipitation

Cconduction

Dconvection

Eradiation

View Explanation & Discuss

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