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139 questions

Question 1 of 20 139 total questions

Question 21

neco 2009

Which of the following statements about the pressure in a liquid is NOT correct? It

Aacts in all direction

Bchanges with the material of the container

Cis the same at all points in the same horizontal plane

Dvaries with the density of the liquid

Evaries with the depth of the liquid

View Explanation & Discuss

Question 22

neco 2009

Determine the value of x from the nuclear reaction below,

\(^{222}_{86}Rn\) → \(^{x}_{88}Ra\) + 2β + energy

A220

B222

C224

D226

E228

View Explanation & Discuss

Question 23

neco 2009

Which of the following substances undergoes sublimation?

AEther

BIce

CIodine

DNaphthalene

ETurpentine

View Explanation & Discuss

Question 24

neco 2009

The space between the two walls of a vacuum flask is completely evacuated to reduce heat loss by

Acondensation

Bconduction

Cconvection

Devaporation

Eradiation

View Explanation & Discuss

Question 25

neco 2009

An observer heard the sound of thunder 5.8s after the lightning flash was seen. How far was he from the source? [Speed of sound in air = 330ms-1]

A957m

B1914m

C3828m

D8700m

E17400m

View Explanation & Discuss

Question 26

waec 2009

An electron of mass 9.1 x 10^-31 kg moves with a speed of 10⁷ms^-1. Calculate the wavelength of the associates wave[h = 6.6 x 10^-34Js]

A9.0 x 10^-24m

B4.55 x 10^-17m

C7.25 x 10^-11m

D6.20 x 10^-8m

View Explanation & Discuss

Question 27

waec 2009

The main difference between x-rays and \(\gamma-rays\) lies in their

Aionizing ability

Babsorption rate

Cmode of production

Dmode of propagation

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Question 28

waec 2009

Two isotopes of uranium are designed as \(^{238}U\) and \(^{235}U\). The numbers 238 and 235 represent their

Aatomic numbers

Bnucleon numbers

Cproton numbers

Dneutron numbers

View Explanation & Discuss

Question 29

waec 2009

An ammeter connected to an a.c circuit records 5.5. The peak current in the circuit is

A7.8A

B7.1A

C3.8A

D3.5A

View Explanation & Discuss

Question 30

waec 2009

An inductor of inductance 1.0H is connected in series with a capacitor of capacitance 2.0\(\mu F\) in an a.c. circuit. to resonate

A112.5Hz

B225.0Hz

C323.5Hz

D707.1Hz

View Explanation & Discuss

Question 31

waec 2009

If the direction of the curent in a straight wire is reversed, the magnetic field

Aremains the same

Bbecomes parallel to the wire

Cceases to exist

Dis oppositely directed

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Question 32

waec 2009

A battery of e.m.f. 12.0V and internal resistance0.5\(\Omega\) is connected to 1.5\(\Omega\) and 4.0\(\Omega\) series resistor. Calculate the terminal voltage of the battery.

A13.0V

B11.0V

C3.0V

D1.0V

View Explanation & Discuss

Question 33

waec 2009

A wire of resistivity 4.40 x 10^-5\(\Omega\) cm has a cross sectional area of 7.50 x 10^-4 cm². Calculate the length of the wire that will be required to make a 4.0\(\Omega\) resistor

A82.50 cm

B68.18cm

C15.90cm

D11.95cm

View Explanation & Discuss

Question 34

waec 2009

A cell of e.m.f. 1.5V is connected in series with a resistor of resistance 3.0\(\Omega\). A voltmeter connected across the cell registers 0.9V. Calculate the internal resistance of the cell

A2.0\(\Omega\).

B3.0\(\Omega\).

C5.0\(\Omega\).

D6.0\(\Omega\).

View Explanation & Discuss

Question 35

waec 2009

A resistor of resistance R is connected to a battery of negligible internal resistance. If a siilar resistor is connected in series with it the

Aeffective resistance of the circuit is halved

Btotal power dissipated is doubled

Ctotal current in the circuit is halved

Dterminal voltage is halved

View Explanation & Discuss

Question 36

waec 2009

An isolated metal sphere of radius R, carrying an electric charge Q, is situated in the medium of relative permitivity, E_r. A test charge is placed at a point p, distance r from the surface of the sphere. Let E_o represent the permitivity of free space. The magnitude of the electric field intensity at P is given by the expression

A\(\frac{Q}{4 \pi E_o E_r r^2}\)

B\(\frac{Q}{4 \pi E_o E_r(R + r)^2}\)

C\(\frac{Q}{4 \pi E_o E_r(R - r)^2}\)

D\(\frac{Q}{4 \pi E_o E_rR^2}\)

View Explanation & Discuss

Question 37

waec 2009

An isolated metal sphere of radius R, carrying an electric charge Q, is situated in the medium of relative permitivity, Er. A test charge is placed at a point p, distance r from the surface of the sphere. Let Eo represent the permitivity of free space. The electric potential at p is given by the expression

A\(\frac{Q}{4 \pi E_o E_r}\)

B\(\frac{Q}{4 \pi E_o E_r (R +r)}\)

C\(\frac{Q}{4 \pi E_o E_r(R - r)}\)

D\(\frac{Q}{4 \pi E_o E_rR}\)

View Explanation & Discuss

Question 38

waec 2009

When a conductor mounted on an insulating stand is charged and left for sometime, the conductor eventually loses all its charges. This is because the

Aelectric charges evaporate from the surface of the conductor

Bcharges are connected to earth

Ccharges on the conductor are neutralized by opposite charges from the surrounding air

Dcharges ionize the surrounding air

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Question 39

waec 2009

A satellite in circular motion around the earth does not have

Aa gravitational force acting on it

Ba uniform velocity

Can acceleration

Da centripetal force acting on it

View Explanation & Discuss

Question 40

waec 2009

Sound interference is necessary to produce the phenomenon of

Abeats

Bdoppler effect

Cacoustic resonance

Decho

View Explanation & Discuss

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