JAMB UTME - Physics - 1981 | Green Bridge CBT

A closed coil of wire is placed near a magnet. The magnet lies along the axis of the coil. Under which of the following conditions would there be no current in the coil?

When the coil is moved toward the stationary magnet

When the coil is moved away from the stationary magnet

when the coil is held stationary but the magnet is moved towards the coil

when both the coil and the magnet are held stationary

when the coil is held stationary but the magnet is moved away from the cell

Detalhes da Resposta

Read lesson note on Force On A Current-carrying Conductor In A Magneti (JAMB)

Force On A Current-carrying Conductor In A Magneti

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Pergunta 8 Relatório

The effect of closing the key K in the circuit shown above would be to

increase the current by 0.6A

reduce the current by 0.6A

increase the current by 0.4A

keep the current unchanged

Detalhes da Resposta

Read lesson note on Capacitors (JAMB)

Read lesson note on Current Electricity (JAMB)

Read lesson note on Simple A.C Circuits (JAMB)

Capacitors

Current Electricity

Simple A.C Circuits

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Pergunta 9 Relatório

Which type of radiation does not NOT originate within the nucleus?

alpha

beta

gamma

neutron

x-rays

Detalhes da Resposta

Read lesson note on Electric Field (WAEC)

Electric Field

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Pergunta 10 Relatório

The quantity (timbre) of sound depends on

amplitude

frequency

harmonics

velocity

wavelength

Detalhes da Resposta

Read lesson note on Characteristics Of Sound Waves (JAMB)

Characteristics Of Sound Waves

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Pergunta 11 Relatório

Which type of radiation does not NOT originate within the nucleus?

alpha

beta

gamma

neutron

x-rays

Detalhes da Resposta

Read lesson note on Electromagnetic Field (Part 2) (WAEC)

Electromagnetic Field (Part 2)

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Pergunta 12 Relatório

A solid weighs 4.8g in air, 2.8g in water and 3.2g in kerosine. The ratio of density of the solid to that of the kerosine is

\(\frac{3}{2}\)

\(\frac{5}{4}\)

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Pergunta 13 Relatório

When fixed mass of an ideal gas expands at constant temperature, which property of the gas molecule increases?

average number per unit volume

average kinetic energy

average speed

average seperation

average number of collisions per unit time

Detalhes da Resposta

Read lesson note on Gas Laws (JAMB)

Gas Laws

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Pergunta 14 Relatório

Which of the following does NOT describe the image formed by a plane mirror?

erect

laterally inverted

same distance from mirror as object

magnified

virtual

Detalhes da Resposta

Read lesson note on Electrostatics (JAMB)

Electrostatics

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Pergunta 15 Relatório

An inclined plane of angle \(\theta\), acting as a simple machine, has a velocity ratio

sin\(\theta\)

\(\frac{1}{\text{sin}\theta}\)

cos\(\theta\)

\(\frac{1}{\text{cos}\theta}\)

sin\(\theta cos\theta\)

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Pergunta 16 Relatório

A transformer has 300 turns of wire in the primary coil and 30 turns in the secondary coil.If the input voltage is 100 volts, the output voltage is

5 volts

10 volts

15 volts

20 volts

25 volts

Detalhes da Resposta

Read lesson note on Capacitors (JAMB)

Capacitors

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Pergunta 17 Relatório

The resistance of an open series circuit is

zero

half the normal resistance of the circuit

double the normal resistance of the circuit

one

infinite

Detalhes da Resposta

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Pergunta 18 Relatório

The driver in a motor car, of which the total mass is 800kg and which is traveling at 20ms^-1, suddenly observes a stationary dog in his path 50m ahead. If the car brakes can exert a force of 2000N, what will most likely happen?

the car will be able to stop immediately the driver notices the dog

the car will stop 3pm after hitting the dog

the car will stop 20m in front of the dog

the driver will quickly reverse the car

the car will stop 5m beyound the dog

Detalhes da Resposta

Read lesson note on Gravitational Field (JAMB)

Gravitational Field

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Pergunta 19 Relatório

If I is the current passing through a metallic resistor and H is the rate of Heat generated in the resistor at a constant temperature, then

H \(\alpha\) \(\frac{1}{I}\)

H \(\alpha\) \(\frac{1}{I^2}\)

H \(\alpha\) \(\sqrt1\)

H \(\alpha\) I²

none of the above

Detalhes da Resposta

Read lesson note on Current Electricity (JAMB)

Current Electricity

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Pergunta 20 Relatório

If a source of sound is moving, a stationary listener will hear a sound of different frequency. This is called

Doppler effect

Resonance

Ultra sound

Diffraction of sound

Rarefaction

Detalhes da Resposta

Read lesson note on Sound Waves (WAEC)

Sound Waves

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Pergunta 21 Relatório

Heat may be transferred by conduction, convection and radiation. By which of these methods does heat travel through vacuum?

conduction only

convection only

radiation only

non of these methods

Detalhes da Resposta

Read lesson note on Heat Transfer (JAMB)

Heat Transfer

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Pergunta 22 Relatório

The lack of power of accommodation which is mainly due to the hardening of the eye lens and is usual with onset of old age is called?

myopia

hypermyopia

presbyopia

astigmatism

eye ring

Detalhes da Resposta

Read lesson note on Structure Of The Atom (Nigeria Only) (WAEC)

Structure Of The Atom (Nigeria Only)

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Pergunta 23 Relatório

Alternating current can induce voltage because it has a

ripple value

varying magnetic field

weaker magnetic field than direct current

stonger magnetic field than direct current

high peak value

Detalhes da Resposta

Read lesson note on Electric Field (WAEC)

Read lesson note on Electromagnetic Field (Part 2) (WAEC)

Electric Field

Electromagnetic Field (Part 2)

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Pergunta 24 Relatório

Change of state is accompanied by change of

temperature

volume

heat content

temperatureb and volume

volume and heat content

Detalhes da Resposta

Read lesson note on Change Of State (JAMB)

Change Of State

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Pergunta 25 Relatório

The principle of transmissibility of pressure in a fluid at rest in all directions is known as

Archimede's principle

Flotation Principle

Newton's lwa

Pascal's law

Boyle's law

Detalhes da Resposta

Read lesson note on Pressure (JAMB)

Pressure

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Pergunta 26 Relatório

All of the following frequencies are overtones of 320 Hz EXCEPT

960Hz

640Hz

520Hz

1280Hz

1600Hz

Detalhes da Resposta

Read lesson note on Electromagnetic Waves: Types Of Radiation In Elect (WAEC)

Electromagnetic Waves: Types Of Radiation In Elect

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Pergunta 27 Relatório

A body falls freely under gravity (g = 9.8ms^-2) from a height of 40m on to the top of a platform 0.8m above the ground. Its velocity on reaching the platform is

784ms^-1

80ms^-1

78.4ms^-1

39.2ms^-1

27.7ms^-1

Detalhes da Resposta

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Pergunta 28 Relatório

An aircraft travelled from calabar to kano as follows: it flew first to ilorin convering a distance of 300km, 30^o west of North, and then flew 400km, 60^o East of North to kano. What is the resultant displacement?

567km

410km

594km

500km

600km

Detalhes da Resposta

Read lesson note on Motion (JAMB)

Motion

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Pergunta 29 Relatório

The ice and steam points of mercury-in-glass thermometer of centigrade scale and of uniform bore correspond respectively to 3cm and 19cm lengths of the mercury thread when the length is 12cm, the temperature is

32^oC

48^oC

56^oC

65^oC

75^oC

Detalhes da Resposta

Read lesson note on Measurements And Units (JAMB)

Measurements And Units

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Pergunta 30 Relatório

Which of the following is NOT an effect that can be produced by an electric current?

heat

light

sound

motion

none of the above

Detalhes da Resposta

Read lesson note on Current Electricity (JAMB)

Read lesson note on Simple A.C. Circuits (WAEC)

Current Electricity

Simple A.C. Circuits

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Pergunta 31 Relatório

A body of mass 6kg rests on an inclined plane. The normal reaction is R and the limiting frictional force is F as shown in the image above. if F = 30N, and g = 10ms² then the angle of inclination \( \theta \) is

\( 15^{\circ} \)

\( 30^{\circ} \)

\( 45^{\circ} \)

\( 60^{\circ} \)

\( 75^{\circ} \)

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Pergunta 32 Relatório

The mass of a proton is approximately equal to that of

an \(\alpha\)-particle

a \(\beta\)-particle

\(\gamma\)-ray

an electron

a neutron

Detalhes da Resposta

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Pergunta 33 Relatório

The following types of waves are transverse EXCEPT

light waves

radio waves

sound waves

surface waves on water

X-rays

Detalhes da Resposta

Read lesson note on Production And Propagation Of Waves (WAEC)

Read lesson note on Sound Waves (WAEC)

Read lesson note on Properties Of Waves: Reflection, Refraction, Diffraction (WAEC)

Read lesson note on Types Of Waves (WAEC)

Production And Propagation Of Waves

Sound Waves

Properties Of Waves: Reflection, Refraction, Diffraction

Types Of Waves

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Pergunta 34 Relatório

The wave motion above has a frequency

0.1Hz

0.2Hz

5Hz

10Hz

100Hz

Detalhes da Resposta

Read lesson note on Types Of Waves (WAEC)

Types Of Waves

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Pergunta 35 Relatório

A cell of e.m.f 2V and internal resistance 1\(\Omega\) supplies a current of 0.5 amps to a resistance whose value is

0.5\(\Omega\)

1\(\Omega\)

2\(\Omega\)

2.5\(\Omega\)

3\(\Omega\)

Detalhes da Resposta

Read lesson note on Electric Cells (JAMB)

Electric Cells

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Pergunta 36 Relatório

A liquid-in-glass thermometer should quickly register temperature changes. This is achieved by choosing a liquid that

is opaque

has high density

has regular expansion

has a high thermal conductivity

can wet glass

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Pergunta 37 Relatório

The latent heat of fusion of a substance is the heat required to

raise the temperature of unit mass of the substance by 1 ^oC

maintain unit mass of the substance at constant temperature

change unit mass of substance from solid to liquid at constant temperature

change unit mass of liquid to vapour at constant temperature

raise the temperature of unit mass by 100^oC

Detalhes da Resposta

Read lesson note on Quantity Of Heat (JAMB)

Quantity Of Heat

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Pergunta 38 Relatório

When a ray of light passes from water to glass, it is

bent away from the normal

bent towards the normal

totally internally reflected

absorbed by the glass

broken into a pure spectrum

Detalhes da Resposta

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Pergunta 39 Relatório

in a light experiment with a convex lens a student plotted a graph as shown above of the reciprocal of object distance (1)/u against the reciprocal of image distance (1)/v . the focal length of the lens is given as

slope of line PQ

Reciprocal of either OP or OQ

Length OP or OQ

area under the graph E ratio OP/OQ

Detalhes da Resposta

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Pergunta 40 Relatório

Which of the following elements are real magnetic materials?

Iron, steel and nickel

copper, steel and iron

lead, iron and brass

glass, lead and steel

stone, air and iron

Detalhes da Resposta

Read lesson note on Magnets And Magnetic Fields (JAMB)

Magnets And Magnetic Fields

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Pergunta 41 Relatório

The absolute refractive indices of glass and water are \(\frac{3}{2}\) and \(\frac{4}{3}\) respectively. The refractive index at the interface when a ray travels from water to glass is

\(\frac{1}{2}\)

\(\frac{8}{9}\)

\(\frac{9}{8}\)

\(\frac{17}{12}\)

Detalhes da Resposta

Read lesson note on Refraction Of Light Through At Plane And Curved (JAMB)

Read lesson note on Optical Instruments (JAMB)

Refraction Of Light Through At Plane And Curved

Optical Instruments

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Pergunta 42 Relatório

The relationship between the period T and the length T of a smile pendulum is T = 2\( \pi \) \( ( \frac{I}{g}) ^{ \frac{1}{2} } \). From experiment data of T and I, one can obtain the following graphs, i. T vs.I ii. T vs I² iii. T² vs. I iv. T vs \( \sqrt{I} \) v. logT vs logI. Which of the following graphs, are linear?

all

only i and ii

only iii and iv

iii,iv and v

none of them

Detalhes da Resposta

Read lesson note on Simple Harmonic Motion (WAEC)

Read lesson note on Simple A.C Circuits (JAMB)

Read lesson note on Propagation Of Sound Waves (JAMB)

Simple Harmonic Motion

Simple A.C Circuits

Propagation Of Sound Waves

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Pergunta 43 Relatório

An object placed on the principle axis of a convex lens of focal length 10m produces a real image of double magnification. The image distance from the lens is

30cm

25cm

20cm

15cm

10cm

Detalhes da Resposta

Read lesson note on Structure Of The Atom (Nigeria Only) (WAEC)

Read lesson note on Electrostatics (JAMB)

Structure Of The Atom (Nigeria Only)

Electrostatics

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Pergunta 44 Relatório

Two particles X and Y starting from rest cover the same distance. The acceleration of X is twice that of Y. the ratio of the time taken by X to that taken by Y is

\(\frac{1}{2}\)

\(\frac{1}{\sqrt2}\)

\(\sqrt 2\)

Detalhes da Resposta

Read lesson note on Newton’s Laws Of Motion (WAEC)

Newton’s Laws Of Motion

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Pergunta 45 Relatório

Which of the following statements is CORRECT?

charges generated on glass rubbed with silk are called negative

charges in various media can be carried by protons detached from their atom

the magnitude of any charge is a multiple of the charge of an electron

the intensity of an electric field is a scalar quantity

if 500 joules of work are required to move a 2-coulomb charge between two points, the potential difference between the two point is 100V

Detalhes da Resposta

Read lesson note on Properties Of Waves: Reflection, Refraction, Diffraction (WAEC)

Properties Of Waves: Reflection, Refraction, Diffraction

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Pergunta 46 Relatório

Which of the following statements is applicable to a real image formed by a concave mirror? i. it can be observed on a screen ii. it is always inverted and in front of the mirror iii. it only seams to exist IV. it is formed by the actual converging of rays of light

i, ii and iii

i, ii and iv only

i and ii only