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107 questions JAMB 2483 WAEC 1904 NECO 322 CUSTOM 10

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107 questions

Question 1 of 20 107 total questions

Question 31

waec 1990

Which of the following instruments is suitable for making the most accurate measurement of the internal diameter of a test tube?

Ametre rule

BA pair of callipers

CA micrometer screw gauge

DA tape rule

EA set square

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Question 32

jamb 1990

A force of 5N act at a point Y on a rod XYZ as shown in the diagram above, if XY is 2m. What is the moment of the force about point X?

A0Nm

B3Nm

C7Nm

D10Nm

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Question 33

jamb 1990

What is the average velocity of the sprinter whose velocity time graph is as shown above

A85.0ms^-1

B17.0ms^-1

C8.5ms^-1

D1.7ms^-1

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Question 34

jamb 1990

Two horizontal forces, 10N and 8N and another force F1 inclined at 30 to the vertical acting as shown in the diagram above, keep the body P in equilibrium, The weight of the body is

A2√3/3N

B√2N

C4√3/3

D2V3N

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Question 35

jamb 1990

What is the reading of the vernier scale above

A1.88cm

B1.80cm

C1.28cm

D1.97cm

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Question 36

jamb 1990

The photocell works on the principle of the

Avoltaic cell

Bemision of electrons by incident radiation

Cemision of protons by incident electrons

Dphotographic plate

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Question 37

jamb 1990

A substance has a half of 3mins. after 6mins. the count rate was observed to be 400. What was its count rate at zero time?

A200

B1200

C1600

D2400

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Question 38

jamb 1990

What precaution should a manufacturer take to ensure that energy loss in a transformer is minimized?

Athe winding of the transformer should be made of high resistance wire

Bthe core should be made of thin sheets of metal

Cno magnetic material should be used to make the core

Dthe flux linking the primary with the secondary coils should be minimum

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Question 39

jamb 1990

The number of neutrons contained in the nucleus \(^{238}_{92}U\) is

A92

B146

C238

D330

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Question 40

jamb 1990

A 0 - 10mA galvanometer with a coil resistance of 30\(\Omega\) can be converted to a 0 - 10A ammeter by using

A0.03\(\Omega\) series resistor

B0.03\(\Omega\) shunt resistor

C9.99\(\Omega\) shunt resistor

D9.99\(\Omega\) series resistor

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Question 41

jamb 1990

A lamp is rated 240V, 60W. The resistance of the filament is

A960\(\Omega\)

B16\(\Omega\)

C15\(\Omega\)

D4\(\Omega\)

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Question 42

jamb 1990

Electrical power is transmitted at a high voltage rather than low voltage because the amount of energy loss is reduced due to

Aheat dissipation

Bproduction of eddy currents

Cexcessive current discharge

Dexcessive voltage distance

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Question 43

jamb 1990

Which of the following is most suitable for protecting the circuit of 2000W electric iron connected to a 250V mains?

A13A

B8A

C5A

D3A

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Question 44

jamb 1990

Which of the following is an essential physical property of the wires used for making fuses?

Alow density

Bhigh thermal conductivity

Clow electrical resistivity

Dlow melting point

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Question 45

jamb 1990

The total energy required to send a unit positive charge round a complete electrical circuit is the

Akinetic energy

Bpotential difference

Celectromotive force

Delectrical energy

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Question 46

jamb 1990

When a known standard resistor of 2\(\Omega\) is connected to the 0.0cm end of a meter bridge, the balance point is found to be at 55.0cm. What is the value of the unknown resistor?

A1.10\(\Omega\)

B1.64\(\Omega\)

C2.44\(\Omega\)

D27.50\(\Omega\)

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Question 47

jamb 1990

Three cells each of e.m.f. 1.5v and an internal resistance of 1.0\(\Omega\) are connected in parallel across a load resistance of 2.67\(\Omega\). Calculate the current in the load?

A0.26A

B0.41A

C0.50A

D0.79A

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Question 48

jamb 1990

Which of the following is a vector?

AElectric charge

BElectric field

CElectrical potential difference

DElectrical capacitance

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Question 49

jamb 1990

Which of the following statements are true of an insulated charged body carrying positive charge? i. it contains excess positive charges. ii. it creates an electric field. iii. it possesses potential energy. iv. it carries electric current.

Ai and iv only

Bi and ii only

Ci, ii, iii only

Di, ii, iii and iv

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Question 50

jamb 1990

One of the properties of the earth's magnetic field is that the

Anorth pole lies in the northern hemisphere

Bgeographic and magnetic meridians coincide

Cearth's magnetic flux is entirely horizontal at a place where the magnetic dip is zero

Dearth's magnetic flux is entirely vertical at a place where the magnetic dip is zero

View Explanation & Discuss

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