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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 701

jamb 2002

A copper cube weighs 0.25 N in air, 0.17N when completely immersed in paraffin oil and 0.15 N when completely immersed in water.The ratio of upthrust in oil to upthrust in water is

A3 : 5

B4 : 5

C7 : 10

D13 : 10

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Question 702

jamb 2001

Which of the following graphs correctly represents the variation of mass of a given material deposited with time for constant current in Faraday's Law of Electrolysis?

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Question 703

jamb 2001

What is the angle of dip at the magnetic equator

A\( 45^{\circ} \)

B\( 0^{\circ} \)

C\( 90^{\circ} \)

D\( 180^{\circ} \)

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Question 704

jamb 2001

A bread toaster uses a current of 4A when plugged in a 240V line. it takes 1 minute to toast slices of bread. what is the energy consumed by the toaster

A5.76 x 10⁴J

B1.60 x 10⁴J

C3.60 x 10³J

D1.60 x 10²J

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Question 705

jamb 2001

Find the frequencies of the first three harmonics of a piano string of length 1.5m, if the velocity of the wave on the string is 120ms-1

A40Hz, 80Hz, 120Hz

B80Hz, 160Hz, 240Hz

C180Hz, 360Hz, 540Hz

D369Hz, 180Hz, 90Hz

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Question 706

jamb 2001

In the diagram above, determine the r.m.s current

A31A

B48A

C60A

D80A

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Question 707

jamb 2001

In the circuit diagram above , the ammeter reads a current of 3A when R is 5Ω and 6A when R is 2Ω. Determine the value of x

A8Ω

B2Ω

C10Ω

D4Ω

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Question 708

jamb 2001

The diagram above shows a closed side 0.5m in a uniform electric field E in the direction shown by the arrows. What is the flux Φ for the box?

A0.5 E

B2.0 E

C0.2 E

D0.0 E

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Question 709

jamb 2001

The diagram above shows the capacitors C\(_1\), C\(_2\) and C\(_3\) 2μF, 6μF and 3μF respectively. The potential difference across C\(_1\), C\(_2\) and C\(_3\) respectively are

A4V, 6V and 2V

B2V, 6V and 4V

C6V, 4V and 2V

D6V, 2V and 4V

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Question 710

jamb 2001

The diagram above shows two capacitors P and Q of capacitance 2μF and 4μF respectively connected to a d.c source. The ratio of energy stored in P to Q is

A4:1

B2:1

C1:4

D1:2

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Question 711

jamb 2001

In the diagram above , the current I is

A³/₈

B⁹/₁₁

C¹¹/₉

D⁸/₃

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Question 712

jamb 2001

If ray travelling in air is incident on a transparent medium as shown in the diagram, the refractive index of the medium is given as

Acosα / sinβ

Bsinα / sinβ

Ccosβ / sinα

Dsinβ / sinα

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Question 713

jamb 2001

The diagram above is a block and tackle pulley system in which an effort of 80N is use to lift a load of 240N. The efficiency of the machine is

A60%

B50%

C40%

D33%

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Question 714

jamb 2001

In the diagram above, which of the simple pendula will resonate with P when set into oscillation

CR and T

DQ and R

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Question 715

jamb 2001

The magnetic force on a charged particle moving with velocity v is

Aproportional to both the magnitude of the charge and the velocity v

Bindependent of the magnitude of the charge

Cproportional to the velocity v only

Dproportional to the magnitude of the charge only

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Question 716

jamb 2001

A capacitor of 20 x 10\(^{-12}\)F and an inductor are joined in series. The value of the inductance that will give the circuit a resonance frequency of 200 kHz is

A\(\frac{I}{16}\) H

B\(\frac{I}{8}\) H

C\(\frac{I}{64}\) H

D\(\frac{I}{32}\) H

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Question 717

jamb 2001

Energy losses through eddy currents are reduced by using

Alow resistance wires

Binsulated soft iron wires

Cfew turns of wires

Dhigh resistance wires

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Question 718

jamb 2001

A transistor function mainly as a

Aswitch and amplifier

Brectifier and an amplifier

Ccharge storer and an amplifier

Dcharge storer and a switch

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Question 719

jamb 2001

The force on a current carrying conductor in a magnetic field is greatest when the

Aconductor makes an angle of 60° with the field

Bforce is independent of the angles between the fields and the conductor

Cconductor is parallel with the field

Dconductor is at right angle with the field

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Question 720

jamb 2001

At reasonance, the phase angle in an a.c. circuit is

A90°

B60°

C0°

D180°

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