JAMB UTME - Physics - 1978 | Green Bridge CBT

Question 1 Report

A solid suspended by a piece of string is completely immersed in water. On attempting to lift the solid out of the water, the string breaks when the solid is partly out of the water. This is because

the tension in the string decreases as the solid is lifted

the mass of the solid has increased

the solid apparently weighs less when completely immersed in water than when partially immersed

part of the solid still in water is exerting more force on the string

the solid is no longer in equilibrium with water

Answer Details

Read lesson note on Gravitational Field (WAEC)

Read lesson note on Speed And Velocity (WAEC)

Gravitational Field

Speed And Velocity

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Question 2 Report

Why is it impossible for the lines of force of an electric field to cross one another?

like charges repel each other

a charged particle is deflected by an eletric field

like charges are arranged on the same line of force

a positively charged particle can travel in only one direction at any time

none of these is correct

Answer Details

Read lesson note on Electrostatics (JAMB)

Electrostatics

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Question 3 Report

An air force jet flying with a speed of 335ms-1 went past an anti-aircraft gun. How far is the aircraft 5s later when the gun was fired?

838m

3350m

670m

1675m

67m

Answer Details

Read lesson note on Motion (JAMB)

Motion

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Question 4 Report

The heat from the sun reaches the earth by the process

insulation

precipitation

conduction

convection

radiation

Answer Details

Read lesson note on Heat Energy (WAEC)

Heat Energy

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Question 5 Report

A palm fruit dropped to the ground from the top of a tree 45m tall. How long does it take to reach the ground? (g = 10ms^-2)

4.5s

7.5s

Answer Details

Read lesson note on Gravitational Field (JAMB)

Gravitational Field

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Question 6 Report

A man walks 1km due east and then 1km due north. His displacement is

1 km N15^oE

1 km N30^oE

\(\sqrt 2\)km N 45^oE

\(\sqrt 2\)km N 60^oE

2km N 75^oE

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 7 Report

The force required to make an object of mass m, travelling with velocity v, turn in a circle of radius r is

\(\frac{mv^2}{r}\)

\(\frac{mr^2}{v}\)

\(\frac{mr}{v}\)

\(\frac{mv}{r^2}\)

\(\frac{mv}{r}\)

Answer Details

Read lesson note on Equilibrium Of Forces (WAEC)

Equilibrium Of Forces

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Question 8 Report

an object 1cm high placed on the axis 15cm from a converging lens forms an image 30cm from the lens. The size of the image is

0.5cm

1.5cm

3cm

2.5m

2cm

Answer Details

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

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

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

Refraction Of Light Through Plane And Curved Surfaces

Properties Of Waves: Reflection, Refraction, Diffraction

Electromagnetic Field (Part 2)

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Question 9 Report

The equivalent capacitance for the circuit drawn above is

18µf

4µf

2µf

12µf

13µf

Answer Details

Read lesson note on Capacitors (JAMB)

Capacitors

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Question 10 Report

A string is sustaining a stationary wave when

the frequency of the wave is not proportional to the wavelength of the wave

the amplitude of vibration is always zero

two equal waves are travelling in opposite directions

the waves are longitudinal

the frequency is directly proportional to the length of the string

Answer Details

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Question 11 Report

The electric supply from Kainji Dam is transmitted at high voltages of the order hundreds of kilovolts but is converted to domestic use of about 220 volts by

commutators

transistors

valves and diodes

rectifiers

transformers

Answer Details

Read lesson note on Current Electricity (JAMB)

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

Current Electricity

Simple A.C Circuits

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Question 12 Report

A herdsman yelling out to fellow herdsman heard his voice reflected by cliff 4s later. What is the velocity of sound in air if the cliff is 680m away?

170ms^-1

136ms^-1

340ms^-1

680ms^-1

510ms^-1

Answer Details

Read lesson note on Electrostatics (JAMB)

Electrostatics

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Question 13 Report

The angular dispersion of a prism depends on

the index of refraction only

the angle of incidence as well as the index of refraction

the angle of incidence only

the thickness of the prism

the prism angle

Answer Details

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Question 14 Report

To determine the weight of an object you could

use a beam balance

use a spring balance

find the force necessary

use none of these methods

use any of these methods

Answer Details

Read lesson note on Time (WAEC)

Read lesson note on Measurements And Units (JAMB)

Time

Measurements And Units

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Question 15 Report

A temperature 20^oC is the same as

36^oF

60^oF

11.1^oF

43.1^oF

25^oF

Answer Details

Read lesson note on Temperature And Its Measurement (JAMB)

Temperature And Its Measurement

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Question 16 Report

A piece of rubber 10cm long stretches 6mm when a load of 100N is hung from it. What is the strain?

6 x 10^-2

6 x 10^-3

0.6

Answer Details

Read lesson note on Elasticity (JAMB)

Elasticity

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Question 17 Report

The amount of heat required to raise the temperature of a body is

Thermal energy

thermal conduction

heat loss

specific heat capacity

thermal capacity

Answer Details

Read lesson note on Temperature And Its Measurement (JAMB)

Temperature And Its Measurement

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Question 18 Report

For the correction of myopic defects in the human eye we require

a convex lens

a concave lens

a combination of concave and convex lenses

a prism

a concave mirror

Answer Details

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

Structure Of The Atom (Nigeria Only)

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Question 19 Report

A gas at pressure PN-m^-2 and temperature 27^oC is heated to 77^oC at constant volume. The new pressure is

0.85 PN-m^-2

0.86 PN-m^-2

1.16 PN-m^-2

1.18 PN-m^-2

2.85 PN-m^-2

Answer Details

Read lesson note on Quantity Of Heat (JAMB)

Quantity Of Heat

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Question 20 Report

On an a.c generator, which of the following does not apply?

field magnet

commutator

armature

slip rings

carbon brushes

Answer Details

Read lesson note on Capacitors (JAMB)

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

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

Capacitors

Simple A.C. Circuits

Simple A.C Circuits

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Question 21 Report

The boys are communicating with each other by stretching a string passing through a hole punched in the bottom of each of two tin cans. The physical principle employed is that sound travels

mainly through air

fainter in stretched string

faster through gases than in solids and liquids

with greater ease through a string than in air

none of the above is correct

Answer Details

Read lesson note on Sound Waves (WAEC)

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

Read lesson note on Propagation Of Sound Waves (JAMB)

Read lesson note on Electrostatics (JAMB)

Sound Waves

Refraction Of Light Through Plane And Curved Surfaces

Propagation Of Sound Waves

Electrostatics

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Question 22 Report

Two resistors R1 and R2 are connected in parallel, R2 being greater than R1. The combined resistance is

less than R₁

greater than R₂

the sum of R₁ and R₂

the difference of R₂ and R₁

greater thanR₁ but less than R₂

Answer Details

Read lesson note on Scalars And Vectors (JAMB)

Read lesson note on Equilibrium Of Forces (WAEC)

Scalars And Vectors

Equilibrium Of Forces

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Question 23 Report

An electric charge could be transmitted through

wood, rubber and stone

paper, clay and plastic

glass, acid and cloth

The human body, water and metals

all of the above

Answer Details

Read lesson note on Electrostatics (JAMB)

Electrostatics

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Question 24 Report

mercury is a better barometric fluid than water because i. it needs no colouring ii. its density is many times greater than that of water iii. it does not wet glass iv. it has a high vapour pressure v. it has a high boiling point. which of the above statements are true?

i and ii only

i, ii and iii only

iii and iv only

iv and v only

iii, iv and v only

Answer Details

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

Read lesson note on Vapours (JAMB)

Read lesson note on Pressure (JAMB)

Position, Distance And Displacement

Vapours

Pressure

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Question 25 Report

The net charge on the atom is zero because

the electrons and the protons that are charged are in the nucleus

the total charge on the electrons is equal to the total charge on the protons

the neutrons from a shield around the charged protons

the number of electrons in an atom is half the number of protons

A and B above

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

The angular dispersion of a prism depends on

the index of refraction only

the angle of incidence as well as the index of refraction

the angle of incidence only

the thickness of the prism

the prism angle

Answer Details

Read lesson note on Electrostatics (JAMB)

Electrostatics

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Question 27 Report

The statements below were made by some students describing what happened during the determination of the melting point of solids.
i. the temperature of the solid was solid until melting started
ii. the temperature of the solid rose until melting started
iii. during melting, the temperature was rising
iv. during melting, the temperature was constant
v. the temperature continued to rise after all the solid had melted
vi. the temperature stopped rising after all the solid had melted. Which of the following gives correct statements in the right order?

ii, iv, and v

ii, iii and vi

i, iii and vi

i, iii and v

i, iv and v

Answer Details

Read lesson note on Friction (JAMB)

Read lesson note on Quantity Of Heat (JAMB)

Read lesson note on Temperature And Its Measurement (JAMB)

Friction

Quantity Of Heat

Temperature And Its Measurement

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Question 28 Report

The latent heat of fusion of ice is 80cal g^-1. How much heat is required to change 10g of ice at Q^oC into water at the same temperature?

80 cal

10 cal

8 cal

800 cal

400 cal

Answer Details

Read lesson note on Quantity Of Heat (JAMB)

Quantity Of Heat

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Question 29 Report

The visible part of light consists of the following colours

red, indigo, infra-red, violet, yellow, green and blue

red, green, blue, violet, indigo, orange and yellow

blue, ultra-violet, infra-red, red, yellow, indigo, violet,green and orange

infra-red and ultra-violet

red, orange, yellow, green, blue, indigo and infra-red

Answer Details

Read lesson note on Light Energy (JAMB)

Light Energy

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Question 30 Report

A machine gun with a mass of 5kg fires a 50g bullet at speed of 100ms^-1. The recoil speed of the machine gun is

0.5 msec^-1

1.5 msec^-1

1 msec^-1

2 msec^-1

4 msec^-1

Answer Details

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

Newton’s Laws Of Motion

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Question 31 Report

A magnet is moved through a coil of wire. The e.m.f. produced in the wire depends on

the number of turns in the coil

the strength of the magnet

the speed at which the magnet is moved

all of the above

none of the above

Answer Details

Read lesson note on Magnets And Magnetic Fields (JAMB)

Magnets And Magnetic Fields

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Question 32 Report

An object is positioned between two plane mirrors inclined at right angles to each other. The object is 1 unit from each mirror. The number of images formed is

Answer Details

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Question 33 Report

If NEPA charges 5k per kWhr, what is the cost of operating for 24 hours a lamp required 1A on a 200v line?

24k

55k

40k

26k

32k

Answer Details

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Question 34 Report

In order to convert a galvanometer into an ammeter

a low resistance shunt is connected in parallel

a low resistance shunt is connected in series

a medium resistance shunt is connected in series

a high resistance shunt is connected in parallel

a high resistance shunt is connected in series

Answer Details

Read lesson note on Current Electricity (JAMB)

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

Read lesson note on Motion (JAMB)

Current Electricity

Properties Of Waves: Reflection, Refraction, Diffraction

Motion

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Question 35 Report

The internationally agreed system of units(SI) for physical measurements are

Ib, ft, sec

g, m, sec

kg, m, sec

cm, g, sec

kg, cm, sec

Answer Details

Read lesson note on Fundamental And Derived Quantities And Units (WAEC)

Fundamental And Derived Quantities And Units

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Question 36 Report

In The Diagram, what is the value of W?

10N

15N

20N

30N

Answer Details

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Question 37 Report

Every house supplied with electricity is provided with a box of fuses so that

the consumption of electricity can be recorded

people residing in the house will not have an electric shock if they touch a live wire

the total current drawn from the mains can be limited

the voltage supply can be stabilized

it serves as a standby supply when there is a power failure

Answer Details

Read lesson note on Electrostatics (JAMB)

Electrostatics

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Question 38 Report

A potential difference of 6v is used to produce a current of 5A for 200s through a heating coil. The heat produced is

4800 cal

6000 cal

2400J

240k cal

6000J

Answer Details

Read lesson note on Current Electricity (JAMB)

Read lesson note on Electrical Energy And Power (JAMB)

Current Electricity

Electrical Energy And Power

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Question 39 Report

Two lamps are rated 40W and 220V each are connected in series. The total power dissipated in both lamps is

10W

20W

40W

80W

None of the above

Answer Details

Read lesson note on Current Electricity (JAMB)

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

Current Electricity

Simple A.C Circuits

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Question 40 Report

An object is positioned between two plane mirrors inclined at right angles to each other. The object is 1 unit distance from each mirror, the number of images formed is

Answer Details

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Question 41 Report

The following are some units i. Ns ii. Mm iii. Nm^-2 iv. J^oK^-1. What are the units of latent heat?

iii

Answer Details

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Question 42 Report

An ice cube floats in a glass of water filled to the brim. What happens when the ice melts?

The water level remains the same

there is a drop in the level of water in the glass due to condensation on its outside

the water in the glass overflows

the level of water drops because melted ice occupies less volume

none of the above is correct

Answer Details

Read lesson note on Friction (JAMB)

Read lesson note on Fluid At Rest (WAEC)

Friction

Fluid At Rest

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Question 43 Report

a guitar string is 75cm long. the wavelength of its fundamental note is

75cm

150cm

37.5cm

112cm

50cm

Answer Details

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Question 44 Report

The factional force between two bodies

exists only when there is relative motion or tendency for motion

acts so as to oppose the motion

depends on the normal reaction between the two surfaces

is relatively independent of the area in contact

has all of these characteristics

Answer Details

Read lesson note on Friction (JAMB)

Read lesson note on Pressure (JAMB)

Friction

Pressure

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Question 45 Report

Of the following which is different from the other?

x-rays

gamma-rays

cathode rays

ultra violet rays

infrared rays

Answer Details

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

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

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

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

Read lesson note on Types Of Waves (WAEC)

Electromagnetic Waves: Types Of Radiation In Electromagnetic Spectrum

Properties Of Waves: Reflection, Refraction, Diffraction

Structure Of The Atom (Nigeria Only)

Electromagnetic Field (Part 2)

Types Of Waves

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Question 46 Report

Three 5 ohms resistors connected in parallel have a potential difference of 60v. applied across the combination. The current in each resistor is

36A

12A

24A

10A

Answer Details

Read lesson note on Capacitors (JAMB)

Read lesson note on Current Electricity (JAMB)

Read lesson note on Concepts Of Matter (WAEC)

Capacitors

Current Electricity

Concepts Of Matter

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Question 47 Report

A few grains of table salt were put in a cup of water, kept at constant temperature and left undisturbed. Eventually all the water tasted salty. The action is due to

convection

osmosis

capillarity

diffusion

conductivity

Answer Details

Read lesson note on Scalars And Vectors (JAMB)

Read lesson note on Temperature And Its Measurement (JAMB)

Scalars And Vectors

Temperature And Its Measurement

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Question 48 Report

The density of a solid is defined as the

mass of the solid compared to the mass of an equal volume of water

amount of water displaced when a unit mass of thesolid is immersed in it

weight per unit volume of the solid

volume per unit mass of the solid

mass per unit volume of the solid

Answer Details

Read lesson note on Characteristics Of Sound Waves (JAMB)

Read lesson note on Pressure (JAMB)

Read lesson note on Measurements And Units (JAMB)

Characteristics Of Sound Waves

Pressure

Measurements And Units

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Question 49 Report

Which of the following is true for the image formed by a convex mirror? i. the image is always virtual ii. the image is always erect iii. the image lies between pole and focus iv. the image is never magnified v. the focus length is negative

i only

i and ii only

ii and iii only

i, ii, iii and iv only

all five

Answer Details

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

Refraction Of Light Through Plane And Curved Surfaces

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Question 50 Report

In a D.C. circuit, a 10 microfarad (mf) capacitor is placed in series with a 10 0hm resistor. The total resistance of the combination is

10 ohms