Physics Past Questions

Question 1

waec 1998

It is always not possible to determine exactly and simultaneously the position and momentum of a particle. This statement is known as the

ADe broglie's law

BHeisenberg's uncertainty principle

CCompton effect

DFrank-Hertz experimental law

EWave particle paradox

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Question 2

waec 1998

Two radioactive elements X and Y have half-lives of 100 and 50 years respectively. Samples of X and Y initially contain equal number of atoms. What is the ratio of the number of the remaining atoms of X to that of Y after 200 years?

A4:1

B3:1

C1:1

D1:2

E1:4

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Question 3

waec 1998

The frictional effect between the layers of a moving fluid is called

Acapillarity

Bturbulence

Cdiffusion

Dosmosis

Eviscosity

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Question 4

waec 1998

A radioactive nuclide of proton number X emits a \(\beta\)-particle to form a new nuclide to proton number Y. The correct equation relating X and Y is

AX = Y - 1

BX = Y + 1

CX = 1 - Y

DX = \(\frac{1}{y}\)

EX = Y

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Question 5

waec 1998

The process of increasing the energy of an atom via inelastic collision with an electron is known as

Aionization

Bexcitation

Cfield emission

Dphotoemission

Ethermonic emission

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Question 6

waec 1998

The diagram above represents a section of a pair of vernier calipers. The reading on the instrument is

A5.22cm

B5.24cm

C5.26

D5.35

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Question 7

waec 1998

When light from a source is sent through a gas
I. Certain wavelengths are absorbed.
II. an emission line spectrum results.
III. A dark line is left.
Which of the following is/are correct?

Ai only

Biii only

Ci and ii only

Di and iii only

Eii and iii only

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Question 8

waec 1998

An electron is accelerated from rest through a potential difference of 70kV in a vacuum. Calculate the maximum speed acquired by the electron (electronic charge = -1.6 x 10^-19; mass of an electron = 9.1 x 10^-31kg)

A3.00 x 10⁸ms^-1

B2.46 x 10⁸ms^-1

C1.57 x 10⁸ms^-1

D1.32 x 10⁸ms^-1

E1.11 x 10⁸ms^-1

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Question 9

waec 1998

Which of the following explains the concave meniscus of water in a clean glass tube? the

Aadhension between water and glass molecules is greater than the sdhension between water molecules

Bcohension between water molecules is greater then the adhension between glass and water molecule

Cmolecules of water near the glass move faster than the molecules at the centre of the tube

Dmolecules of water at the water-air boundary are often attracted to the centre of the tube

Eweight of the water pulls the centre part of the surface down

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Question 10

waec 1998

Use the following data to determine the length L of a wire when a fore of 30N is applied, assuming Hooke's law is obeyed
\(\begin{array}{c|c}\text{Force applied/N} & 0 & 5 & 10 & 30\\ \hline \text{length of wire/mm} & 500.0 & 500.0 & 501.0 & L \end{array}\)

A3.0mm

B3.5mm

C503.00mm

D503.5mm

E506.0mm

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Question 11

waec 1998

The diagram below illustrates an a.c.source of 50V(r.m.s.), \(\frac{100}{\pi}\)Hz connected in series with an inductor of inductor of inductance L and a resistor of resistance R. The current in the circuit is 2A and the p.d across L and R are 30V and 40V respectively. Calculate the average power dissipated in the circuit

A100W

B80W

C60W

D20W

E10W

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Question 12

waec 1998

The diagram below illustrates an a.c.source of 50V(r.m.s.), \(\frac{100}{\pi}\)Hz connected in series with an inductor of inductor of inductance L and a resistor of resistance R. The current in the circuit is 2A and the p.d across L and R are 30V and 40V respectively. Calculate the power factor of the circuit

A1.33

B1.25

C0.80

D0.75

E0.60

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Question 13

waec 1998

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

Aalong the line joining the point to the neutral point

Balways away from the south pole of the magnet

Copposite the direction of theresultant field at that point

Dalways towards the north pole of the magnet

Ethe direction towards which the north pole of a compass needle would point

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Question 14

waec 1998

A proton of charge 1.6 x 10\(^{19}\)C is projected into a uniform magnetic field of flux density 5.0 x 10\(^5\)T. If the proton moves parallel to the field with a constant speed of 1.6 x 10\(^6\)ms\(^{-1}\), calculate the magnitude of the force exerted on it by the field

A0.0N

B2.0 x 10^-21N

C1.3 x 10^-17N

D5.1 x 10^-14N

E2.3 x 10¹³N

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Question 15

waec 1998

Lenz's law of electromagnet states that

Athe induced charge is constant for a fixed change of force

Ba force is exerted on a current-carrying conductor in a magnetic field

Cthe magnitude of the induced e.m.f in a circuit is proportional to the rate of change of the number of lines of force linking the circuit

Dthe induced current in a conductor is in such a direction as to oppose the change producing it

Ee.m.f. is induced in a circuit whenever there is a change in the magnetic flux linked with the circuit

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Question 16

waec 1998

The diagram above illustrates a freely suspended bar magnet NS hanging from a point in a horizontal ceiling. The thread used for suspending the magnet and the axis of the magnet are as indicated on the diagram. The angle marked \(\theta\) is called the angle os

Adepression

Bdeclination

Cvariation

Delevation

Edip

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Question 17

waec 1998

Calculate the resistance of the filament of lamp rated at 240V 60W

A240\(\Omega\)

B360\(\Omega\)

C960\(\Omega\)

D144\(\Omega\)

E2880\(\Omega\)

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Question 18

waec 1998

A cell of e.m.f. 1.5v is connected in series with a resistor of 3\(\Omega\). A high resistance voltmeter connected across the cell registers only 0.9v. Calculate the internal resistance of the cell

A5.0\(\Omega\)

B4.5\(\Omega\)

C2.4\(\Omega\)

D2.0\(\Omega\)

E1.8\(\Omega\)

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Question 19

waec 1998

In the electrical method of magnetisation, the polarity of the magnet depends on the

Aamount of current passed

Bdirection of current

Cmagnetic material used

Dsize of the magnetic material

Eorientation of the magnetic material in space

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Question 20

waec 1998

The gravitational force of the moon is one-sixth that of the earth. If a body weighs 6.0N on the moon. Calculate its weight on the earth

A36.0N

B12.0N

C6.0N

D2.0N

E1.0N

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