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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 251

jamb 2019

The conductivity of gases at low pressure can be termed as
I. hot cathode emission
II. thermo ionic emission
III. cold cathode emission
IV. Field emission

AI & II

BII & III

CIII & IV

DIV & V

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Question 252

jamb 2019

In the molecular explanation of conduction, heat is transferred by the

AFree electrons

BFree atoms

CFree molecules

DFree solids

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Question 253

jamb 2019

The statement 'Heat lost by the hot body equals that gained by the cold one' is assumed when determining specific that heat capacity by the method of mixtures. Which of the following validates the assumption?
I. Lagging the Calorimeter
II. Ensuring that only S.I units are used
III. Weighing the calorimeter, the lid and the stirrer.

AI only

BI & II only

CI & III only

DII & III only

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Question 254

jamb 2019

During the transformation of matter from the solid to the liquid state, the heat supplied does not produce a temperature increase because

Athe heat energy is quickly conducted away

Bthe heat capacity has become very large as the substance melts

Cthe heat gained is equal to the heat lost by the substance

Dall the heat is used to break the bonds holding the molecules of the solid together

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Question 255

jamb 2019

The limiting frictional force between two surfaces depends on
I. the cohesive force of the material
II. the nature of the surfaces in contact
III. the relative velocity between the surfaces

AI only

BII only

CIII only

DI & IV only

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Question 256

jamb 2019

An alternating current can induce voltage because it has

Aripple value

Bvarying magnetic field

Cweaker magnetic field than direct current

Dhigh peak value

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Question 257

jamb 2019

A thermocouple thermometer is connected to a millivoltmeter which can read up to 10mV. When one junction is in ice at 0°C and the other is steam at 100°C, the millivoltmeter reads 4mV. What is the maximum temperature which this arrangement can measure

A100\(^o\)C

B248\(^o\)C

C250\(^o\)C

D350\(^o\)C

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Question 258

jamb 2019

A vibrator causes water ripples to travel across the surface of a tank. The wave travels 50cm in 2s and the distance between successive crests is 5cm. Calculate the frequency of the vibrator

A5Hz

B6Hz

C5.2Hz

D25Hz

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Question 259

jamb 2019

A supply of 400V is connected across capacitors of 3μf and 6μf in series. Calculate the charge

A8 x 10\(^{-4}\)C

B4 x 10\(^{-2}\)C

C8 x 10\(^{-3}\)C

D4 x 10\(^{-8}\)C

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Question 260

jamb 2019

The diagram above represents the stress-strain graph of a loaded wire. Which of these statements is correct?

AAt J, the wire becomes plastic

BJ is the yield point

CL is the elastic limit

DAt K, the wire breaks

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Question 261

jamb 2019

Aluminium is sometimes used as the leaf of an electroscope because it

Ais a light material

Bis a good conductor

Cis a good insulator

Dcan be converted into thin sheets

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Question 262

jamb 2019

When the downward current flows in a straight vertical conductor, the direction of its magnetic field at a point due north of the wire is?

AUpward

BNorth

CSouth

DWest

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Question 263

jamb 2019

The pitch of a screw jack is 0.45cm and the arm is 60cm long. If the efficiency of the Jack is 75/π %, calculate the mechanical advantage.

A400

B300

C200

D150

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Question 264

jamb 2019

A straight wire 15cm long, carrying a current of 6.0A is in a uniform field of 0.40T. What is the force on the wire when it is at right angle to the field

A0.46N

B0.35N

C0.36N

D0,24N

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Question 265

jamb 2019

The pin-hole camera produces a less sharply defined image when the

Apin-hole is larger

Billumination is less

Cscreen is further from the pin-hole

Dobject is further from the pin-hole

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Question 266

jamb 2019

A ray of light passes through the centre of curvature of a concave mirror and strikes the mirror. At what angle is the ray reflected?

A180\(^o\)

B90\(^o\)

C0\(^o\)

D60\(^o\)

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Question 267

jamb 2019

The distance between an object and its real image in a convex lens is 40cm. If the magnification of the image is 3, calculate the focal length of the lens

A6.5 cm

B7.5 cm

C8.5 cm

D4.5 cm

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Question 268

jamb 2019

When the temperature of a liquid is increased, its surface tension?

Aincreases

Bdecreases

Cremain constant

Dincreases then decreases

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Question 269

jamb 2019

Ripple in a power supply unit is caused by

Ausing an alternating current source

Bforward voltage drop

Cheavy load

Dusing a zener diode

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Question 270

jamb 2019

Which of the following equations is the correct definition of the reactance of an indicator L?

AReactance = (Amplitude of voltage) \(\div\) (Amplitude of current)

BReactance = (Amplitude of voltage) x (Amplitude of current)

CReactance = (Amplitude of current)\(^2\) \(\div\) (Amplitude of voltage)

DReactance = (Amplitude of current)\(^2\) \(\div\) (Amplitude of voltage)\(\frac{1}{2}\)

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