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Past Questions

46 questions

Question 1 of 20 46 total questions

Question 1

jamb 1984

In the diagram above, X and Y have resistances 6 and 4 ohms respectively, if the power dissipation in X is 10W then power dissipation in Y is

A2.4W

C6.0W

D6.7W

E15.0W

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Question 2

jamb 1984

In the circuit Shown above, calculate the effective capacitance between X and Y

A3/4µF

B\( 2 \frac{10}{13} µF\)

C12µF

D\( 4 \frac{12}{13} µF\)

E13µF

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Question 3

jamb 1984

A short bar magnet is placed in earth's magnetic field, as shown above, which of the points II and III are/is possible positions of a neutral point?

AI only

BII only

CIII only

DI and II

EI,II and III

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Question 4

jamb 1984

A force varying linearly with the distance acts on a body as shown above, The work done on the body by the force during the first 10m of motion is

A100J

B150J

C200J

D300J

E600J

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Question 5

jamb 1984

What is the resistance of the circuit shown above

A4Ω

B11Ω

C19/5Ω

D17/4Ω

E8Ω

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Question 6

jamb 1984

A simple pendulum, 0.6m long, has a period of 1.5s. What is the period of a similar pendulum of 0.4m length in the same location?

A\( 1.5 \frac{ \sqrt{2}}{3} \)s

B\( 1.5 \frac{ \sqrt{3}}{2} \)s

C2.25s

D1.00s

E2.00s

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Question 7

jamb 1984

A galvanometer of resistance 5.0Ω has full-scale deflection for a current of 100mA. How would its range be extended to 1.0A? By placing a resistance of

A\(\frac{5}{9}\)\(\Omega\) in parallel

B\(\frac{9}{5}\)\(\Omega\) in series

C45\(\Omega\) in parallel

D45\(\Omega\) in series

E\(\frac{9}{5}\)\(\Omega\) in parallel

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Question 8

jamb 1984

Which of the following statements is (are) NOT true about the emission of the photoelectrons from metallic surfaces?

i. all metallic surfaces emits the same number of photoelectrons in a given light

ii. most metallic surfaces emit the same number of photoelectrons in visible and infra-red light

iii. a metallic surface emits photoelectrons only if the frequency of the incident light is higher than its own characteristics threshold frequency

Ai only

Bii only

Ci and ii

Dii and iii

Eiii only

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Question 9

jamb 1984

What is the cost of running five 50W lamps and four 100W lamps for 10 hours if electrical energy costs 2 kobo per kWh?

AN0.65

BN0.13

CN3.90

DN39.00

EN234.00

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Question 10

jamb 1984

Radio waves have a velocity of 3 x 10⁸ms^-1. A radio station sends out a broadcast on a frequency of 800kHz. The wavelength of the broadcast is

A375.0m

B267.0m

C240.0m

D37.5m

E26.7m

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Question 11

jamb 1984

Which of the following i. \(\beta\)-particles ii. protons iii. neutrons iv. \(\alpha\)-particles. may be found in light nuclei?

Ai and ii

Bi and iii

Cii and iv

Dii and iii

Ei, ii and iii

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Question 12

jamb 1984

A device that converts sound energy into electrical energy is?

Athe horn of a motor car

Ban A.C. generator

Ca microphone

Dthe telephone

Eradio waves

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Question 13

jamb 1984

Cathode rays are

Ahigh-energy electromagnetic waves

Bprotons

Cstreams of electrons

Dneutrons

Eradio waves

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Question 14

jamb 1984

The spectrum of white light consists of coloured lights arranged in the following order

Ablue, red, green, yellow, indigo, violet, orange

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

Cred, orange, yellow, indigo, green, blue, violet

Dindigo, green, blue, violet, yellow, red, orange

Eyellow, blue, green, violet, orange, indigo, red

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Question 15

jamb 1984

What is the apparent colour of a RED SHIRT when viewed in PURE green light?

ARed

BGreen

CYellow

DBlack

EBlue

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Question 16

jamb 1984

If a water pump at Kainji Dam is capable of lifting 1000kg of water through a vertical height of 10m in 10s, the power of the pump is [g = 10ms^-2]

A1.0kW

B10.0kW

C12.5kW

D15.0kW

E20.0kW

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Question 17

jamb 1984

Which of the following is a correct explanation of the inertia of a body?

Aability to overcome the earth's gravity

Breluctance to stop moving

Creadiness to start moving

Dreluctance to start moving and its readiness to stop moving once it has begun to move

Ereluctance to start moving its reluctance to stop moving once it has begun to move

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Question 18

jamb 1984

A gun of mass 2.0kg fires a bullet of mass 16 x 10 ^-2kg due East. If the bullet leaves the nozzle of the gun with a velocity of 150ms^-1, what is the recoil velocity of the gun?

A150ms^-1 due West

B1.2 x 10^-4ms^-1 due West

C1.2ms^-1 due West

D1.2ms^-1 due East

E150ms^-1 due East

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Question 19

jamb 1984

The electromotive force obtained from a simple dynamo may be increased by

Aincreasing the cross-sectional area of the coil

Bwinding the coil on a soft-iron armature so as to decrease the magnetic flux through the coil

Cincreasing the speed of rotation

Dmaking the field magnet longer

Eusing low-resistance copper coils

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Question 20

jamb 1984

A coin is placed at the bottom of a cube of glass t cm thick. If the refractive index of the glass is \(\mu\), how high does the coin appear to be raised to an observer looking perpendicularly into the glass?

A\(\frac{1}{t - \mu}\)

B\(\frac{t(\mu - I)}{\mu}\)

Ct (1 + \(\frac{1}{\mu}\))

D-\(\mu\)

E\(\mu\)t

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