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4,719 questions

Question 1 of 20 4,719 total questions

Question 1991

waec 1990

A rectangular coil of wire can rotate in a magnetic field. The ends of the coil are soldered to the two halves of a split ring. Two carbon brushes are made to press lightly against the split ring and when these are connected in circuit with a battery and rheostat, the coil rotates. This is a description of

Aa suspended- coil vanometer

Ba moving-cell ammeter

Ca d.c generator

Dan electric motor

Ean induction coil,

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Question 1992

waec 1990

A cell of e.m.f. 1.5 V and internal resistance of 2.59 is connected in series with an ammeter of resistance 0.59 and a resistor of resistance 7.09. Calculate the current in the circuit.

A0.15 A

B0.20 A

C0.60A

D3.00A

E6.67 A.

View Explanation & Discuss

Question 1993

waec 1990

Birds can perch safely on overhead electric power cables without being electrocuted because

Abirds can withstand high p.d. of the electric power cables

Bany accumulated charge on the birds is quickly dissipated

Cthe feet of the birds are well insulated

Dthe current is a.c. and has particular direction

Ethere is no p.d between the birds and the cables

View Explanation & Discuss

Question 1994

waec 1990

Calculate the resistance of the filament of a lamp rates 240 V, 40 W

A240Ω

B360Ω

C720Ω

D1440Ω

E2880Ω

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Question 1995

waec 1990

If the frequency of the ac. circuit illustrated above is 500/π Hz what would be the reactance in the circuit?

(Inductance (L) = 0.9H, Capacitance (C) = \(2 \times 10^{-6}\)

A0.0009Ω/π

B100Ω

C1030Ω

D400Ω

E2500Ω

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Question 1996

waec 1990

A charge of 1.0 x 10^-5 Coulombs experience force of 40N at a certain point in space. What is the electric field intensity?

A8.00 x 10⁶NC^-1

B4.00 x 10⁶NC^-1

C4.00 x 10^-4NC^-1

D2.00 x 10^-4NC^-1

E2.50 x 10^-1NC^-1

View Explanation & Discuss

Question 1997

waec 1990

What is the value of R when G shows no deflection in the circuit illustrated above?

A80Ω

B75Ω

C45Ω

D20Ω

E10Ω

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Question 1998

waec 1990

A work of 30 joules is done is transferring 5 millicoulombs of charge from a point B to a point A in an electric Held. The potential difference between B and A is

A1.7 x 10^-4V

B3.4x10^-4V

C1.5x10^-1V

D6.0 x10³V

E1.2 x10⁴V

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Question 1999

waec 1990

What is the electric potential energy between two protons each of charge q and at a distance of r apart? (Permittivity of free space = εo)

A4πε_oq²r

Bqr/4πε_o

Cq/4πε_or

Dq²/4πε_or

Eq²/4πε_o

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Question 2000

waec 1990

Calculate the current in the 3Ω resistor shown in
the diagram above.

A3.0A

B4.0A

C4.3A

D12.0A

E39.0A

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Question 2001

waec 1990

Given that the gravitational constant is 7 X 10^-11 Nm2kg^-2, what is the force of attraction between 10⁶kg mass of lead hanging one metre away from a 10³kg mass of iron?

A7 x10^-20N

B7 x 10^-5N

C7x10^-2N

D7x10³N

E7x10⁰N

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Question 2002

waec 1990

Which of the following pairs of light rays shows the widest separation in the spectrum of white light?

AYellow and red

BOrange and green

CViolet and blue

DBlue and green

ERed and indigo

View Explanation & Discuss

Question 2003

waec 1990

A simple microscope forms an image twice the size of the object. If the focal length of the lens of the microscope is 20m, how far is the object from the lens?

A10m

B20m

C30m

D40m

E60m

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Question 2004

waec 1990

The eye defect illustrated by the diagram above is

Aastigmatism

Blong sightedness

Closs accommodation

Dshort sightedness

Ecolour blindness

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Question 2005

waec 1990

The eye defect illustrated by the diagram above is

Aastigmatism

Blong sightedness

Closs accommodation

Dshort sightedness

Ecolour blindness

View Explanation & Discuss

Question 2006

waec 1990

The diagram above shows an incident ray A, inclined at angle of 50º to the interface CB. The ray OB is found to lie along the surface. What is the refractive index of the medium X with respect to air?

Asin50^o/sin40^o

Bsin40^osin50^o

Csin90^o/sin50^o

Dsin40^o/sin90^o

Esin90^o/sin40^o

View Explanation & Discuss

Question 2007

waec 1990

The diagram above shows an incident ray A, inclined at angle of 50^o to the interface CB. The ray OB is found to lie along the surface. What is the refractive index of the medium X with respect to air?

Asin50^o/sin40^o

Bsin40^osin50^o

Csin90^o/sin50^o

Dsin40^o/sin90^o

Esin90^o/sin40^o

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Question 2008

waec 1990

A parallel beam of light is to be obtained from the headlamp ofa car. At which of the following positions should the source of light be placed from the pole of its spherical minor?

AAt the focal point

BAt the centre of curvature

CBeyond the centre of curvature

DBetween the focal point and the pole

EBetween the focal point and the center of curvature

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Question 2009

waec 1990

Where will the image of the object OB shown in the diagram above be located after reflection from the mirror?

AAt F

BBeyond C

CBetween O and P

DBetween P and F

EBetween F and C

View Explanation & Discuss

Question 2010

waec 1990

A concave mirror of radius of curvature 20cm has a pin placed at 15cm from its pole. What will be the magnification of the image formed?

A4.00

B2.00

C1.33

D1.50

E0.25

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