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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 1011

jamb 1987

Isotopes are nuclei which have

Athe same number of nuetrons and electrons

Bequal number of electrons and protons

Cthe same atomic number but different number of neutrons

Dthe same number of total particles

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Question 1012

jamb 1987

Which of the following statements is TRUE of photoelectric effect?

Ait cannot occur in liquids

Bthe energy of the emitted electrons is independent of the work function of the surface

Cthe energy of the emitted electron depends on the wavelength of the incident light

Dthe greater the intensity of the incuident light, the greater the incident of the emitted electron

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Question 1013

jamb 1987

What type of reaction is represented by the following scheme? \( ^2 _1X \) + \( ^{2} _{1}Y \) + \( ^{3} _{2}Z \) + \( ^{1} _{0}n \) + energy

AFusion reaction

BFission reaction

CChain reaction

DRadioactive decay

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Question 1014

jamb 1987

A galvanometer of resistance 20\(\Omega\) is to be provided with a shunt that \(\frac{1}{10}\) of the whole current in a circuit passes through the galvanometer. The resistance of the shunt is

A2.00\(\Omega\)

B2.22\(\Omega\)

C18.00\(\Omega\)

D18.22\(\Omega\)

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Question 1015

jamb 1987

When two parallel wires carry currents in opposite directions, the force on either wire is

Aaway from the other wire

Bzero, because the currents cancel each other

Ctwice as much as when the currents are in the same direction

Dtowards the other wire

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Question 1016

jamb 1987

The direction of the magnetic field at a point in the vicinity of a bar magnet is

Aalways towards the north pole of the magnet

Balways away from the south pole of the magnet

Calong the line joining the point to the neutral point

Din the direction the north pole of a compass needle would point

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Question 1017

jamb 1987

A current of 0.5A flows through a resistor when connected to a 40-V battery. How much energy is dissipated in 2 minutes?

A1200J

B1500J

C2400J

D96000J

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Question 1018

jamb 1987

When a transformer has more secondary windings than primary windings, it?

Ahas a smaller secondary current

Bhas a greater power output

Cis a step-down transformer

Dincreases the total energy output

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Question 1019

jamb 1987

Two capacitance of 6\(\mu\)F and 8\(\mu\)F are connected in series. What additional capacitance must be connected in series with this combination to give a total of 3\(\mu\)F

A3\(\mu\)F

B16\(\mu\)F

C24\(\mu\)F

D30\(\mu\)F

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Question 1020

jamb 1987

If the angle of declination in a place is 10oE, calculate the true geographic bearing if the compass reads N40oE

AN50^oE

BN40^oE

CN30^oE

DN25^oE

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Question 1021

jamb 1987

Four lenses are being considered for use as a microscope objective. Which of the following focal lengths is most suitable?

A-5mm

B+5mm

C-5cm

D+5cm

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Question 1022

jamb 1987

A ray of light is incident at an angle of 30o on one top surface of a parallel-sided glass block of refractive index 1.5. The ray finally emerges from the lower surface. What is the angular deviation of the emergent ray?

A60^o

B39^o

C28^o

D0^o

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Question 1023

jamb 1987

A pool of water appears to be 1.0m deep when viewed vertically from above. If the refractive index of water is 1.33, what is the actual depth of the pool?

A0.750m

B1.013m

C1.330m

D13.3000m

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Question 1024

jamb 1987

An object 3.0cm high is placed 60.0cm from a converging lens whose focal length is 20.0cm. Calculate the size of the image formed

A0.5cm

B1.5cm

C2.0cm

D6.0cm

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Question 1025

jamb 1987

If an object is placed in front of two mirrors inclined at 90o, how many images will be formed?

Afive

Bfour

Cthree

Dtwo

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Question 1026

jamb 1987

When the length I of a piece of wire under constant tension is varied, the relationship of the frequency of the vibration f\(\alpha\)/ is

Af\(\alpha\)/

Bf\(\alpha \frac{1}{I^2}\)

Cf \(\alpha\sqrt I\)

Df\(\alpha \frac{1}{1}\)

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Question 1027

jamb 1987

Which of the following statements supports the assumption that light travels in straight lines?

Alight can be diffracted

Ba source of light produces distinct shadows of opaque objects

Ca source of light produces interference patterns on a suitably placed screen

Dlight can be reflected

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Question 1028

jamb 1987

The lowest note emitted by a stretched string has a frequency of 40Hz. How many overtones are there between 40Hz and 150Hz?

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Question 1029

jamb 1987

Which of the following instruments has a pure tone?

Aguitar

Bvibrating strings

Ctuning fork

Dsiren

View Explanation & Discuss

Question 1030

jamb 1987

A boat at anchor is rocked by waves whose crest are 100m apart and whose velocity is 25ms^-1. At what interval does the wave crest reach the boat?

A2500.00s

B75.00s

C4.00s

D0.25s

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