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45 questions JAMB 2483 WAEC 1904 NECO 322 CUSTOM 10

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Past Questions

45 questions

Question 1 of 20 45 total questions

Question 1

jamb 1994

In the curve above, PQRST represents an alternating voltage of frequency 50Hz. The time interval between points P and R on the graph is

A25s

B1/50s

C1/100s

D1/200s

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Question 2

jamb 1994

In the circuit diagram above, calculate the current in the 12 Ω resistor if the cell has an emf of 12V and an internal resistance of 1Ω

A0.8A

B1.0A

C1.6A

D2.4A

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Question 3

jamb 1994

In the fig above, XY is of length 1m, The value of R at balance point Z is

A3.0Ω

B13.3Ω

C15.0Ω

D30.0Ω

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Question 4

jamb 1994

In the fig above if the atmospheric pressure is 760mm, the pressure of the chamber G is

A660mm

B690mm

C830mm

D860mm

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Question 5

jamb 1994

The fig above shows a uniform wood of weight 200Nand length 50m. It is pivoted at one end and suspended by a cord at the other end at an angle of 30 degrees to the wood. calculate the tension in the cord if the wood is horizontal

A10N

B20N

C100N

D200N

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Question 6

jamb 1994

What is the reading of the vernier calipers shown above

A1.79cm

B1.73cm

C1.39cm

D1.34cm

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Question 7

jamb 1994

A spring of length 25cm is extended to 30cm by a load of 150N attached to one of its end, what is the energy stored in the spring?

A3750J

B2500J

C3.75J

D2.50J

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Question 8

jamb 1994

If light with photon energy 2eV is incident suitably on the surface of a metal with work function 3eV, then

Ano electron will be emitted

Bthe few electrons emitted will have a maximum kinetic energy of 1eV

Cthe few electrons emitted will have a maximum kinetic energy of 3eV

Dmany electrons will be emitted

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Question 9

jamb 1994

A certain radioisotope of \(^{235}_{92}U\) emits four alpha particles and three beta particles. The mass number and the atomic number of the resulting elements respectively are

A219 and 87

B84 and 223

C223 and 87

D219 and 81

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Question 10

jamb 1994

If two parallel conductors carry currents flowing in the same direction, the conducts will

Aattract each other

Brepel each other

Cboth move in the same direction

Dhave no effect on each other

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Question 11

jamb 1994

Which of the following are found in the receiver but not in the microphone of a telephone handset? i. Diaphragm. ii. soft iron pole pieces. iii. permanent magnet. iv.carbon blocks

Ai and ii

Bi and iv

Cii and iii

Diii and iv

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Question 12

jamb 1994

Two capacitors R₁ = 4\(\Omega\) and R₂ = 5\(\Omega\) are connected in parallel across a potential difference. If P₁ and P₂ represent power dissipated in R ₁ and R₂ respectively, then the ratio P₁ : P₂ is

A4 : 5

B5 : 4

C16 : 25

D25 : 16

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Question 13

jamb 1994

A capacitor 8\(\mu\)F is charged to a potential difference of 100V. The energy stored by the capacitor is

A1.0 x 10⁴J

B8.0 x 10J

C1.25 x 10J

D4.0 x 10^-2J

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Question 14

jamb 1994

When a biro pen rubbed on a dry silk cloth is moved very close to a piece of paper on a dry table, the pen is found to pick up the paper. This is because

Aboth the pen and the cloth are magnetized

Bthe pen is magnetized but the cloth is not

Cthe pen is charged while the cloth is magnetized

Dboth the pen and the cloth are charged

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Question 15

jamb 1994

Which of the following has the lowest internal resistance when new?

Aleclanche cell

BDaniel cell

CAccumulator

DTorch battery

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Question 16

jamb 1994

If the Nigeria flag (green, white, green) is viewed in pure yellow light, which of the following set of colours would be observed on the flag?

AGreen, yellow, green

BRed, yellow, red

Cblack, yellow, black

DGreen, white, green

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Question 17

jamb 1994

In a projection lantern of focal length f, the object distance u, is such that

Au > 2f > f

Bu < f < 2f

Cu = f < 2f

Df < u < 2f

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Question 18

jamb 1994

An object is placed directly below a glass block of thickness 3.0cm. Calculate the lateral displacement of the object if the refractive index of the glass is 1.5.

A1.0cm

B1.5cm

C2.0cm

D2.5cm

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Question 19

jamb 1994

An object is placed in front of a converging lens of a focal length 20cm. The image is virtual and has a magnification of 2. What is the distance of the object from the lens?

A5cm

B10cm

C30cm

D40cm

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Question 20

jamb 1994

Light of frequency 6.0 x 10\(^{14}\) Hz travelling in air is transmitted through glass or refractive index 1.5. Calculate the frequency of the light in the glass

A4.0 x 10¹⁴Hz

B6.0 x 10¹⁴Hz

C7.5 x 10¹⁴Hz

D9.0 x 10¹⁴Hz

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