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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 381

waec 2019

An electron of mass 9.1 x 10\(^{-31}\) kg moves with a speed of 2.0 x 10\(^6\) ms\(^{-1}\) round the nucleus of an atom in a Circular path of radius 6.1 x 10(^{11}\) m. Determine the angular speed of the electron.

A3.28 x 10\(^{16}\) rad s\(^{-1}\)

B8.55 x 10\(^{3}\) rad s\(^{-1}\)

C9.11 x 10\(^{13}\) rad s\(^{-1}\)

D5.22 x 10\(^{15}\) rad s\(^{-1}\)

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Question 382

waec 2019

Which of the following devices is used for storing electric charges?

ATransformer

BAmmeter

CPotentiometer

DCapacitor

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Question 383

waec 2019

The diagram above illustrates a meter bridge circuit underbalanced conditions. Determine the value of x.

A50.cm

B10.0 cm

C28.6 cm

D57.2 cm

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Question 384

waec 2019

Which of the following statements is the correct reason for using soft iron in making the armature or an electric bell?

AIt is a diamagnetic material

BIt loses its magnetism readily

CIt is not easily magnetized

DIt retains its magnetism for a long time

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Question 385

waec 2019

An a.c. the generator can be converted to a d.c. generator by replacing the

Acommutator with an armature

Barmature with a commutator

Ccommutator with slip rings

Dslip rings with a commutator

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Question 386

waec 2019

The maximum and minimum thermometer reads the

Athe maximum temperature during the day and the minimum temperature at night at all times.

Bthe maximum temperature at night and minimum temperature during the day at all times

Dthe maximum temperature during the day and minimum temperature at night from the last reset

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Question 387

waec 2019

The mass of a load is doubled while the force acting on it is halved. The resulting acceleration of the load is

Aquadrupled

Bquartered

Chalved

Ddoubled

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Question 388

waec 2019

An 800 kg car moving at 80 km hr\(^{-1}\) collides with a 1200 kg car moving at 40 km hr\(^{-1}\) in the same direction. If the cars stick together, calculate their common velocity.

A60 km hr\(^{-1}\)

B8 km hr\(^{-1}\)

C40 km hr\(^{-1}\)

D56 km hr\(^{-1}\)

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Question 389

waec 2019

Which of the following graphs gives the correct relationship between energy and mass when mass is converted to energy.

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Question 390

waec 2019

Which of the following characteristics of waves can a ripple tank be used to demonstrate?
I. Reflection
II. Refraction
III. Diffraction

AI, II and Ill

Bll and ll only

Cl and lII only

DI and II only

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Question 391

waec 2019

In which of the following media is the speed of sound the least?

AAir

BBrass

CWater

DWood

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Question 392

waec 2019

A transverse pulse of frequency 9 Hz traves 4.5m in 0.6 s. Calculate the wavelength of the pulse.

A3.33 m

B0.30 m

C0.83 m

D1.20 m

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Question 393

waec 2019

The wire of a platinum resistance thermometer has d resistance of 3.5\(\Omega\) at 0 °C and 10.52\(\Omega\) at 100°C. Calculate the temperature of the wire when its resistance is 7.5\(\Omega\).

A78 °C

B25 \(^o\)C

C30\(^o\)C

D57 \(^o\)C

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Question 394

waec 2019

Calculate the quantity of heat needed to change the temperature of 60g of ice at 0 °C to 80 °C. [specific latent heat of fusion of ice= 3.36 x 10\(^5\) Jkg\(^{-1}\) specific heat capacity of water 4.2 x 10\(^3\) J kg\(^{-1}\) K\(^{-1}\)]

A4.80 kJ

B20.16 kJ

C40.32 kJ

D22.17 kJ

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Question 395

waec 2019

A small amount of air is introduced into the vacuum above the mercury in a mercury barometer tube. The mercury level goes down because the air molecules

Aheat the mercury and make it expand

Bincrease the pressure above the mercury.

Ccool the mercury and make it contract.

Ddecrease the pressure above the mercury

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Question 396

waec 2019

Which of the following graphs above of a charge Q against potential difference V across the capacitor is correct?

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Question 397

waec 2019

A freshly demagnetized bar magnet is placed in the East-West direction to ensure that

Athe molecular magnets remain randomly arranged.

Bthe molecular magnets are properly aligned

Cit is affected by the earth's magnetic field

Dthe magnetic domains are within the earth's field

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Question 398

waec 2019

If the efficiency of a transformer is 100%, which of the following equations would be correct?

AN\(_p\)E\(_p\) = N\(_s\)E\(_s\)

BN\(_s\)I\(_p\)= N\(_p\)I\(_s\)

CN\(_s\)I\(_s\) = N\(_p\)I\(_p\)

DI\(_p\)E\(_s\) = I\(_s\)E\(_p\)

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Question 399

waec 2019

Which of the following statements about a moving object is correct?

AWhen accelerating, the resultant force acting on it must be equal to zero.

BThere must always be a non-zero resultant force acting on it.

CAt a steady velocity, the resultant force acting on it must be equal to zero

DAt a steady velocity, the air resistance must be equal to zero.

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Question 400

waec 2019

The diagram above represents an experimental set-up for verifying?

Alens formula

Brefraction laws

Creflection laws

Dmirror formula

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