JAMB UTME - Physics - 1981 | Green Bridge CBT

Question 1 Report

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

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

\(\frac{1}{4}\)

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

\(\sqrt 2\)

Answer Details

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

Newton’s Laws Of Motion

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Question 2 Report

Heat was supplied to a block of ice at 0^oC until half of it melted. Which of the following statements is true?

the temperature rises and the ice expand

the temperature remains constant and the volume of the ice decreases Correct answer

the ice gives out heat as it melts and the temperature decreases

the mass remains constant and the temperature increases

the temperature decreases because some heat is lost

Answer Details

Read lesson note on Heat Energy (WAEC)

Read lesson note on Change Of State (JAMB)

Read lesson note on Temperature And Its Measurement (JAMB)

Heat Energy

Change Of State

Temperature And Its Measurement

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Question 3 Report

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

3 Correct answer

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

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

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Question 4 Report

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 Correct answer

none of them

Answer Details

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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Question 5 Report

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

bent away from the normal

bent towards the normal Correct answer

totally internally reflected

absorbed by the glass

broken into a pure spectrum

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Question 6 Report

Which of the following elements are real magnetic materials?

Iron, steel and nickel Correct answer

copper, steel and iron

lead, iron and brass

glass, lead and steel

stone, air and iron

Answer Details

Read lesson note on Magnets And Magnetic Fields (JAMB)

Magnets And Magnetic Fields

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Question 7 Report

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 Correct answer

Answer Details

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Question 8 Report

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 Correct answer

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Question 9 Report

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

heat

light

sound

motion

none of the above Correct answer

Answer Details

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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Question 10 Report

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 Correct answer

change unit mass of liquid to vapour at constant temperature

raise the temperature of unit mass by 100^oC

Answer Details

Read lesson note on Quantity Of Heat (JAMB)

Quantity Of Heat

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Question 11 Report

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 Correct answer

i and ii only

ii and iv only

all four statements

Answer Details

Read lesson note on Reflection Of Light At Plane And Curved Surfaces (JAMB)

Reflection Of Light At Plane And Curved Surfaces

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Question 12 Report

The resistance of a 240V, 60 watt electric filament bulb is

0.25\(\Omega\)

480\(\Omega\)

60\(\Omega\)

240\(\Omega\)

960\(\Omega\) Correct answer

Answer Details

Read lesson note on Current Electricity (JAMB)

Current Electricity

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Question 13 Report

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

Doppler effect Correct answer

Resonance

Ultra sound

Diffraction of sound

Rarefaction

Answer Details

Read lesson note on Sound Waves (WAEC)

Sound Waves

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Question 14 Report

The following types of waves are transverse EXCEPT

light waves

radio waves

sound waves Correct answer

surface waves on water

X-rays

Answer Details

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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Question 15 Report

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

sin\(\theta\)

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

cos\(\theta\)

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

sin\(\theta cos\theta\)

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Question 16 Report

All of the following frequencies are overtones of 320 Hz EXCEPT

960Hz

640Hz

520Hz Correct answer

1280Hz

1600Hz

Answer Details

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

Electromagnetic Waves: Types Of Radiation In Electromagnetic Spectrum

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Question 17 Report

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 Correct answer

non of these methods

Answer Details

Read lesson note on Heat Transfer (JAMB)

Heat Transfer

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Question 18 Report

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

erect

laterally inverted

same distance from mirror as object

magnified Correct answer

virtual

Answer Details

Read lesson note on Electrostatics (JAMB)

Electrostatics

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Question 19 Report

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

alpha

beta

gamma

neutron

x-rays Correct answer

Answer Details

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

Electromagnetic Field (Part 2)

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Question 20 Report

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 Correct answer

keep the current unchanged

Answer Details

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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Question 21 Report

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 Correct answer

15 volts

20 volts

25 volts

Answer Details

Read lesson note on Capacitors (JAMB)

Capacitors

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Question 22 Report

An example of a scalar quantity is

velocity

weight

electric charge Correct answer

acceleration due to gravity

momentum

Answer Details

Read lesson note on Scalars And Vectors (JAMB)

Read lesson note on Position, Distance And Displacement (WAEC)

Scalars And Vectors

Position, Distance And Displacement

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Question 23 Report

The wave motion above has a frequency

0.1Hz

0.2Hz

5Hz Correct answer

10Hz

100Hz

Answer Details

Read lesson note on Types Of Waves (WAEC)

Types Of Waves

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Question 24 Report

Alternating current can induce voltage because it has a

ripple value

varying magnetic field Correct answer

weaker magnetic field than direct current

stonger magnetic field than direct current

high peak value

Answer Details

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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Question 25 Report

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 Correct answer

astigmatism

eye ring

Answer Details

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

Structure Of The Atom (Nigeria Only)

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Question 26 Report

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 Correct answer

600km

Answer Details

Read lesson note on Motion (JAMB)

Motion

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Question 27 Report

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 Correct answer

none of the above

Answer Details

Read lesson note on Current Electricity (JAMB)

Current Electricity

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Question 28 Report

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 Correct answer

25cm

20cm

15cm

10cm

Answer Details

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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Question 29 Report

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 Correct answer

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

Answer Details

Read lesson note on Force On A Current-Carrying Conductor In A Magnetic Field (JAMB)

Force On A Current-Carrying Conductor In A Magnetic Field

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Question 30 Report

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

\( 15^{\circ} \)

\( 30^{\circ} \) Correct answer

\( 45^{\circ} \)

\( 60^{\circ} \)

\( 75^{\circ} \)

Answer Details

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Question 31 Report

a balloon inflated with helium gas at ground level is released. As it rises through a constant temperature atmosphere.

its pressuren reduces but volume remains constant

te product of pressure and volume remains constant Correct answer

both pressure and volume increases

its pressure remains constant but the volume decreases

both pressure and volume remains constant

Answer Details

Read lesson note on Gas Laws (JAMB)

Read lesson note on Pressure (JAMB)

Gas Laws

Pressure

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Question 32 Report

The quantity (timbre) of sound depends on

amplitude

frequency

harmonics Correct answer

velocity

wavelength

Answer Details

Read lesson note on Characteristics Of Sound Waves (JAMB)

Characteristics Of Sound Waves

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Question 33 Report

A vapour is said to be saturated when

moer molecules return to the liquid than leave it

a dynamic equilibrium exists between the liquid molecules and the vapour molecules at a given temperature Correct answer

the vapour pressure is atmospheric

the temperature of the vapour varies

all molecules are moving with the same speed

Answer Details

Read lesson note on Vapours (JAMB)

Vapours

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Question 34 Report

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 Correct answer

Boyle's law

Answer Details

Read lesson note on Pressure (JAMB)

Pressure

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Question 35 Report

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 Correct answer

the driver will quickly reverse the car

the car will stop 5m beyound the dog

Answer Details

Read lesson note on Gravitational Field (JAMB)

Gravitational Field

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Question 36 Report

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 Correct answer

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

Answer Details

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

Properties Of Waves: Reflection, Refraction, Diffraction

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Question 37 Report

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 Correct answer

Answer Details

Read lesson note on Gas Laws (JAMB)

Gas Laws

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Question 38 Report

The mass of a proton is approximately equal to that of

an \(\alpha\)-particle

a \(\beta\)-particle

\(\gamma\)-ray

an electron

a neutron Correct answer

Answer Details

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Question 39 Report

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 Correct answer

65^oC

75^oC

Answer Details

Read lesson note on Measurements And Units (JAMB)

Measurements And Units

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Question 40 Report

The extension in a spring when 5g wt was hung from it was 0.56cm. If Hooke's law is obeyed, What is the extension caused by a load of 20g wt?

1.12m

2.14cm

2.52cm

2.80cm

2.24cm Correct answer

Answer Details

Read lesson note on Elasticity (JAMB)

Elasticity

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Question 41 Report

Change of state is accompanied by change of

temperature

volume

heat content Correct answer

temperatureb and volume

volume and heat content

Answer Details

Read lesson note on Change Of State (JAMB)

Change Of State

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Question 42 Report

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

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

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

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

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

Answer Details

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

Read lesson note on Optical Instruments (JAMB)

Refraction Of Light Through Plane And Curved Surfaces

Optical Instruments

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Question 43 Report

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 Correct answer

can wet glass

Answer Details

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Question 44 Report

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 Correct answer

Length OP or OQ

area under the graph E ratio OP/OQ

Answer Details

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Question 45 Report

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\(\Omega\)