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4,719 questions

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Question 1851

waec 1993

A block of material of volume 2 X 10\(^{-5}\)m\(^3\) and density 2.5 x 10\(^3\) kgm\(^{-3}\) is suspended from a spring balance with half volume of the block immersed in water. What is the reading of the spring balance? (Density of water =1.0x10\(^3\) kg m\(^{-3}\) g = 10 ms\(^{-2}\)).

A0.10N

B0.25N

C0.30N

D0.40N

E0.50N

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Question 1852

waec 1993

A particle starts from rest and moves with a constant acceleration of 0.5 ms^-2? Calculate the time taken by the particle to cover a distance of 25m.

A25s

B7.1s

C10.0s

D50.0s

E100.0s.

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Question 1853

waec 1993

A body of mass m = 0.5 kg is suspended by a string and pulled by a horizontal force of 12N as shown in the diagram. Calculate the tension T in the String if the body is in equilibrium. [Take g as 10ms\(^{-1}\)]

A7.0

B10.9

C12.5

D13.0

E17.0

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Question 1854

waec 1993

A body of mass M1 moving with a velocity U collides with a stationary body of mass M2 and both move with a common velocity V lf linear momentum is conserved, which of the following expressions correctly represents V?

M₁ U/M₁ + M₂

M₂ U/M₁ + M₂

M₁ + M₂/M₁ U

M₁ - M₂/M₁ U

M₁ U/M₁ - M₂

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Question 1855

waec 1993

A body timed 20 oscillations of a certain pendulum three times and obtained 44.3s, 45.5s and 45.7s respectively. Calculate the mean period of oscillation of the pendulum

A0.13s

B2.22s

C2.26s

D44.30s

E45.17s

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Question 1856

waec 1993

Which of the following is a derived unit?

AAmpere

BKilogramme

CSecond

DOhm

EKelvin

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Question 1857

waec 1993

A body moves along a circular path with uniform angular speed of 0.6 rad s^-1 and at a constant speed of 3.0ms^-1. Calculate the acceleration of the body towards the centre of the circle.

A25.0ms^-2

B5.4 ms^-2

C5.0ms^-2

D1.8 ms^-2

E0.2ms^-2

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Question 1858

waec 1993

Which of the following is not an example of a force?

ATension

BWeight

CFriction

DMass

EThrust

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Question 1859

jamb 1993

In the network shown above, determine the potential difference across the 5µF capacitor

A3V

B6V

C12V

D18V

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Question 1860

jamb 1993

The current I in the fig above is

A4.00A

B1.30A

C0.80A

D0.75A

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Question 1861

jamb 1993

Two mirrors M1 and M2 are inclined at right angles as shown above calculate the angle of reflection of the ray of light at M2

A\( 30^{\circ} \)

B\( 45^{\circ} \)

C\( 60^{\circ} \)

D\( 90^{\circ} \)

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Question 1862

jamb 1993

In the fig above,A lever of length 200m is used to lift a load of mass 180kg. The pivot at P is 20m from the load. what minimum force F must be applied at the end of the lever [g = 10ms-2]

A9N

B18N

C20N

D200N

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Question 1863

jamb 1993

The diagram above shows a velocity time graph representing the motion of a car. Find the total distance covered during the acceleration and retardation of the motion

A75m

B150m

C300m

D375m

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Question 1864

jamb 1993

The kinetic theory of photoelectron liberated from a metallic surface depends on the

Aintensity of the incident radiation

Btime duration of the incident radiation

Ctemperature of the incident radiation

Dfrequency of the incident radiation

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Question 1865

jamb 1993

An element X of an atomic number 88 and mass number 226 decays to form an element Z by emitting two beta particles and an alpha particle. Z is represented by

A\(^{222}_{82}Z\)

B\(^{222}_{88}Z\)

C\(^{226}_{86}Z\)

D\(^{226}_{80}Z\)

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Question 1866

jamb 1993

Which of the following are produced after a nuclear fusion process? i. one heavy nucleus. ii. neutrons^-1. iii. protons. iv. Energy.

Ai and ii

Bi and iv

Cii and iii

Dii and iv

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Question 1867

jamb 1993

Natural radioactivity is the random spontaneous disintegration of the nuclei of heavy isotopes of certain elements with the emission of

A\(\alpha\), X, and \( \beta\)

B\(\alpha\), \(\beta\) and \(\gamma\)-rays

CX, \(\alpha\), \(\gamma\)-ray

D\(\alpha\), \( \beta\) and X-rays

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Question 1868

jamb 1993

Which of the following statements correctly describe(s) cathode rays? i. they consist of tiny particles carrying negative electric charges. ii. they are deflected in a magnetic field but not in an electric field. iii. they consist of fast moving neutrons and deflected in an electric field.

Ai only

Bii only

Ci and ii only

Dii and iii only

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Question 1869

jamb 1993

Determine the inductive reactance when a 30.0mH inductor with a negligible resistance is connected to a 1.3 x 10³Hz oscillator.

A39.0\(\Omega\)

B122.5\(\Omega\)

C245.0\(\Omega\)

D39000.0\(\Omega\)

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Question 1870

jamb 1993

The primary aim in high tension transmission is to

Aminimize electrical energy losses due to heat production

Bincrease the rate of energy transfer by using high voltage

Cincrease the current in the wire

Dgenerate electricity at high current and low voltage

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