JAMB UTME - Physics - 1988 | Green Bridge CBT

Ibeere 1 Ìròyìn

A cell of internal resistance 2 ohms supplies current to a 6 ohms resistor. The efficiency of the cell is

12.0%

25.0%

33.3%

75.0%

Awọn alaye Idahun

Efficiency = $\frac{I R}{I (R + r)}$ x 100

= $\frac{6}{I (2 + 6)}$ x 100

= 75%

Ka ìwé ẹ̀kọ́ nípa Current Electricity (JAMB)

Current Electricity

Wo Idahun

Ibeere 2 Ìròyìn

When heat is applied to one end of a metal rod, the molecules at the other end soon begin to vibrate with greater amplitude than before because heat has been transferred by

radiation

convection

conduction

evaporation

Heat Transfer

Simple A.C Circuits

Conduction Of Electricity Through

Wo Idahun

Ibeere 3 Ìròyìn

The figure above shows three different ways of hanging a heavy picture from a hook. the tension in the string will be

Greatest in X

Greatest in Y

Greatest in Z

Same in each one

Wo Idahun

Ibeere 4 Ìròyìn

In the figure above, what is the angle of reflection of the ray of light at mirror M?

90∘

60∘

45∘

30∘

Electrostatics

Wo Idahun

Ibeere 5 Ìròyìn

A household refrigerator is rated 200 watts. If electricity costs 5k per kWh, what is the cost of operating it in 20 days?

N4.80

N48.00

N480.00

N4800.00

Electrical Energy And Power

Electromagnetic Field (Part 1)

Wo Idahun

Ibeere 6 Ìròyìn

A 20-toothed gear wheel drives a 60-toothed one. If the angular speed of the smaller wheel is 120 rev s-1, the angular speed of the larger wheel is

3 rev s-1

40 rev s-1

360 rev s-1

2400 rev s-1

Awọn alaye Idahun

$\frac{speed of driver}{speeder driven}$ = $\frac{no. of teeth of driver}{no. of teeth of driven}$

$\frac{120}{V}$ = $\frac{20}{60}$

v = 360 rev s-1

Ka ìwé ẹ̀kọ́ nípa Motion (JAMB)

Ka ìwé ẹ̀kọ́ nípa Mass And Weight (WAEC)

Motion

Mass And Weight

Wo Idahun

Ibeere 7 Ìròyìn

How long will it take a 60kg man to climb a height of 22m if he expended energy at a rate of 0.25kW. [g = ms-2]

5.3s

34.5s

41.6s

52.8s

Awọn alaye Idahun

power = mgh

0.25 x 103 = $\frac{60 \times 10 \times 22}{t}$

t = 52.8 sec

Ka ìwé ẹ̀kọ́ nípa Work, Energy And Power (WAEC)

Work, Energy And Power

Wo Idahun

Ibeere 8 Ìròyìn

The speed of sound in air at sea-level is 340ms-1 while that of light is 300 000kms-1. How far (to the nearest meter) from the center of a thunderstorm is an observer who hears a thunder 2s after a lightening flash?

170ms-1

340ms-1

600ms-1

680ms-1

Current Electricity

Wo Idahun

Ibeere 9 Ìròyìn

When a resistance R is across a cell, the voltage across the terminals of the cell is reduced to two-third of its normal value. The internal resistance of the cell is

\frac{2}{1}

R

\frac{1}{2}

R

\frac{3}{2}

R

5R

Awọn alaye Idahun

IR = $\frac{2}{3}$ I(R + r)

r = $\frac{1}{2}$ R

Ka ìwé ẹ̀kọ́ nípa Current Electricity (JAMB)

Ka ìwé ẹ̀kọ́ nípa Scalars And Vectors (JAMB)

Current Electricity

Scalars And Vectors

Wo Idahun

Ibeere 10 Ìròyìn

Two forces whose resultant is 100N, are at right angle to each other. If one of them makes an angle 30o with the resultant, determine its magnitude.

8.66N

50.0N

57.7N

86.6N

Awọn alaye Idahun

COS 30o = $\frac{F_{1}}{100}$

F1 = 86.6N

Ka ìwé ẹ̀kọ́ nípa Scalars And Vectors (WAEC)

Scalars And Vectors

Wo Idahun

Ibeere 11 Ìròyìn

The product PV where P is pressure and V is volume has the same unit as

force

power

energy

accelaration

Awọn alaye Idahun

PV = $\frac{N}{m^{2}}$ x $\frac{m^{2}}{1}$

= Nm

Ka ìwé ẹ̀kọ́ nípa Measurements And Units (JAMB)

Measurements And Units

Wo Idahun

Ibeere 12 Ìròyìn

Which of the following properties is/are common to all waves? i. Diffraction ii. Refraction iii. Interference

i only

ii only

ii and iii

i, ii, and iii

Properties Of Waves: Reflection, Refraction, Diffraction

Wo Idahun

Ibeere 13 Ìròyìn

The figure above shows two waveforms X and Y. If the frequency of X is 30Hz what is the frequency of Y

12Hz

19Hz

60Hz

75Hz

Propagation Of Sound Waves

Wo Idahun

Ibeere 14 Ìròyìn

A lorry travels 10km northwards, 4km eastwards, 6km southwards, 4km westwards to arrive at a point T. What is the total displacement?

6km south

4km north

6km north

4km east

Scalars And Vectors

Position, Distance And Displacement

Wo Idahun

Ibeere 15 Ìròyìn

Which of the following phenomena explains the formation of a mirage? i. Reflection ii. Refraction iii. Diffraction

i and ii only

ii and iii only

i and iii only

i, ii, and iii only

Reflection Of Light At Plane And Curved Surfaces

Refraction Of Light Through At Plane And Curved

Wo Idahun

Ibeere 16 Ìròyìn

The principle of operation of an induction coil is based on

Ohm's law

Amphere's law

Faraday's law

Columbs law

Electric Field

Properties Of Waves: Reflection, Refraction, Diffraction

Wo Idahun

Ibeere 17 Ìròyìn

Which of the following quantities are scalars? i. Electrical potential ii. Torque iii. Momentum iv. Kinetic energy

ii and iii only

i and ii only

iii and iv only

i and iv only

Scalars And Vectors

Wo Idahun

Ibeere 18 Ìròyìn

A particle starts from rest and moves with a constant acceleration of 0.5ms-2. The distance covered by the particle in 10s is

2.5m

5.0m

25.0m

50.0m

Awọn alaye Idahun

X = ut + $\frac{1}{2}$ at

= (0 x 10) + ( $\frac{1}{2}$ x 0.05 x 10 x 10)

= 25m

Ka ìwé ẹ̀kọ́ nípa Motion (JAMB)

Motion

Wo Idahun

Ibeere 19 Ìròyìn

To obtain a magnification of 2.5, how far should an object be placed from the pole of a thin converging lens of focal length 10.20m?

0.13m

0.25m

0.28m

0.50m

Awọn alaye Idahun

v = 2.5u

F = $\frac{u v}{u + v}$

0.2 = $\frac{u \times 2.5 u}{u + 2.5 u}$

u = 0.28m

Ka ìwé ẹ̀kọ́ nípa Reflection Of Light At Plane And Curved Surfaces (JAMB)

Ka ìwé ẹ̀kọ́ nípa Simple A.C Circuits (JAMB)

Ka ìwé ẹ̀kọ́ nípa Electrostatics (JAMB)

Reflection Of Light At Plane And Curved Surfaces

Simple A.C Circuits

Electrostatics

Wo Idahun

Ibeere 20 Ìròyìn

Which of the following ammeters may be used to measure alternating currents? i. moving-coil ammeter ii. moving-iron ammeter iii. hot-wire ammeter

i and ii only

ii and iii only

i and iii only

i, ii, and iii

Capacitors

Electrostatics

Wo Idahun

Ibeere 21 Ìròyìn

The figure above shows displacement-time graphs for three different motions. which of the following statements is correct

graph 2 corresponds to the highest velocity

graph 1 corresponds to zero gravity

graph 3 corresponds to a particle moving in the negative x direction

graph 2 corresponds to a particle moving in the positive x direction

Scalars And Vectors

Wo Idahun

Ibeere 22 Ìròyìn

A tap supplies water at 25oC while another supplies water at 75oC. If a man wishes to bathe with water at 40oC, the ratio of the mass of cold water to the mass of hot water required is

1 : 3

15 : 8

7 : 3

3 : 1

Awọn alaye Idahun

Heat lost = heat gained

mh x c x (75 - 40) = mc x c x (40 - 25)

$\frac{m_{h}}{m_{c}}$ = $\frac{35}{15}$

= $\frac{7}{3}$

Ka ìwé ẹ̀kọ́ nípa Heat Energy (WAEC)

Heat Energy

Wo Idahun

Ibeere 23 Ìròyìn

Which of the following factors affects the speed of sound in air? i. Temperature ii. pressure iii. Frequency

i only

ii only

i and ii only

ii and iii only

Description Property Of Fields

Electromagnetic Field (Part 2)

Wo Idahun

Ibeere 24 Ìròyìn

In the circuit diagram above, the ammeter reads a current of 3A when R is 5 ohms and 6A when R is 6 ohms,the value of the unknown resistance X is

1

2

3

4

Scalars And Vectors

Simple A.C Circuits

Wo Idahun

Ibeere 25 Ìròyìn

When white light is dispersed by a spectrometer, the component having the shortest wavelength is

orange

green

violet

red

Wo Idahun

Ibeere 26 Ìròyìn

The wire X in the figure above is at right angles to the plane of the paper and carries a current into the paper. at which of the points labelled 1-4, will the magnetic flux density due to this current be in the same direction as that of the horizontal component of earth's magnetic field

1

2

3

4

Newton’s Laws Of Motion

Electromagnetic Field (Part 2)

Gravitational Field

Wo Idahun

Ibeere 27 Ìròyìn

Which of the following are the correct SI units of the quantities indicated? i.N(Force) II. Mn-1 (Torque) iii. watt(Power) iv. kgms-2

i and ii only

i, ii and iii only

i, ii, and iv only

i and iii only

Position, Distance And Displacement

Measurements And Units

Wo Idahun

Ibeere 28 Ìròyìn

A note is called an octave of another note when

its frequency is twice that of the first note

its frequency is half of the first note

the notes have the same fundamental frequency

its periodic time is twice that of the first note

Sound Waves

Propagation Of Sound Waves

Wo Idahun

Ibeere 29 Ìròyìn

A particle is injected perpendicularly into an electric field, it travels along a curved path as depicted in the image above,the particle is

gamma ray

electron

neutron

proton

Electric Field

Wo Idahun

Ibeere 30 Ìròyìn

A slight loading of a tuning fork has the effect of

decreasing its amplitude

increasing its amplitude

decreasing its frequency

increasing its frequency

Newton’s Laws Of Motion

Simple Harmonic Motion

Motion

Wo Idahun

Ibeere 31 Ìròyìn

An object is placed 10cm in front of a concave mirror of focal length 15cm. What is the position and nature of the image formed?

30cm and virtual

6cm and real

6cm and virtual

30cm and real

Awọn alaye Idahun

F = $\frac{u v}{u + v}$

15 = $\frac{10 \times v}{10 + v}$

v = -30cm

Ka ìwé ẹ̀kọ́ nípa Electrostatics (JAMB)

Electrostatics

Wo Idahun

Ibeere 32 Ìròyìn

Which of the following media allow the transmission of sound wave through them i. Air. ii. Liquids. iii. Solids.

i and ii only

i and iii only

ii and iii only

i,ii and iii

Reflection Of Light At Plane And Curved Surfaces

Propagation Of Sound Waves

Wo Idahun

Ibeere 33 Ìròyìn

When taking a penalty kick, a footballer applies a force of 30.0N for a period of 0.05s. if the mass of the ball is 0.075kg, calculate the speed with which the ball moves off.

4.50ms-1

11.25ms-1

20.00ms-1

45.00ms-1

Awọn alaye Idahun

F = $\frac{m (v - u)}{T}$

30 = $\frac{0.75 (v - 0)}{0.05}$

v = 20ms-1

Ka ìwé ẹ̀kọ́ nípa Equilibrium Of Forces (WAEC)

Equilibrium Of Forces

Wo Idahun

Ibeere 34 Ìròyìn

Two strings of the same length and under the same tension gives notes of frequencies in the ratio 4 : 1. The masses of the strings are in the corresponding

2 : 1

1 : 2

1 : 4

1 : 16

Awọn alaye Idahun

F = $\frac{1}{2 L}$ $\sqrt{\frac{T}{m}}$

$\frac{F_{1}}{F_{2}}$ = $\sqrt{\frac{m_{2}}{m_{1}}}$

$\frac{1}{4}$ = $\sqrt{\frac{m_{2}}{m_{1}}}$

$\sqrt{\frac{m_{2}}{m_{1}}}$ = $\frac{1}{2}$

Ka ìwé ẹ̀kọ́ nípa Motion (JAMB)

Motion

Wo Idahun

Ibeere 35 Ìròyìn

The amount of heat needed to raise the temperature of 10kg of copper by 1k is its

specific heat capacity

heat capacity

latent heat

internal energy

Heat Energy

Wo Idahun

Ibeere 36 Ìròyìn

A dynamo primarily combines

mechanical energy into electrical energy

electrical energy into kinetic energy

potential energy into kinetic energy

kinetic energy into potential energy

Wo Idahun

Ibeere 37 Ìròyìn

A force, 10N, drags a mass 10kg on a horizontal table with an acceleration of 0.2ms. If the acceleration due to gravity is 10ms-1, the coefficient of friction between the moving mass and the table is

0.02

0.08

0.20

0.80

Awọn alaye Idahun

$μ$ mg = ma

$μ$ x 10 x 10 = 10 x 0.2

$μ$ = 0.02

Ka ìwé ẹ̀kọ́ nípa Newton’s Laws Of Motion (WAEC)

Ka ìwé ẹ̀kọ́ nípa Measurements And Units (JAMB)

Newton’s Laws Of Motion

Measurements And Units

Wo Idahun

Ibeere 38 Ìròyìn

A spectrum of sunlight is said to be impure when

it is made of only three colours

it has no red colour in it

the different colours in it overlap

it does not contain white light

Light Waves

Properties Of Waves: Reflection, Refraction, Diffraction

Electromagnetic Field (Part 2)

Wo Idahun

Ibeere 39 Ìròyìn

A body whose mass is 2kg and has a volume of 500cm just floats when completely immersed in a liquid. Calculate the density of the liquid

4.0 x 102kgm-3

4.0 x 103kgm-3

1.0 x 103kgm-3

1.0 x 106kgm-3

Awọn alaye Idahun

since the object floats, density of liquid = density of object

D = $\frac{m}{v}$

= $\frac{2}{500 \times 10}$

= 4.0 x 103kgm-3

Ka ìwé ẹ̀kọ́ nípa Pressure (JAMB)

Pressure

Wo Idahun

Ibeere 40 Ìròyìn

Which of the following symbolic representations is correct for an atom X with 22 electrons and 43 neutrons?

43	X
22

22	X
43

_{43}^{65} X

_{22}^{65} X

Structure Of The Atom (Nigeria Only)

Wo Idahun

Ibeere 41 Ìròyìn

In a certain fusion reaction, a deuteron ( $_{1}^{2} H$ ) interacts with a triton ( $_{1}^{3} H e$ ) and produces an a-particle ( $_{2}^{4} H e$ ) and a second product. The second product is

a proton

an electron

a neutron

a gamma ray

Awọn alaye Idahun

$_{1}^{2} H$ + $_{1}^{3} H$ $\to$ $_{2}^{4} H e$ + $_{0}^{1} H e$

Ka ìwé ẹ̀kọ́ nípa Structure Of The Atom (Nigeria Only) (WAEC)

Structure Of The Atom (Nigeria Only)

Wo Idahun

Ibeere 42 Ìròyìn

Which of the following statement is TRUE of ultraviolet, visible and infra-red rays?

they are all electromagnetic waves with the same wavelength

ultra-violet rays have shorter wavelengths than infra-red rays and produce flourescence

infrared rays have shorter wavelength than visible light and produce the sensation of heat

the wavelenghts increase in the sequence: visible, ultra-violet, infra-red

Sound Waves

Electromagnetic Waves: Types Of Radiation In Elect

Light Waves

Wo Idahun

Ibeere 43 Ìròyìn

A piano wire 0.5m long has a total mass of 0.01kg and is stretched with a tension of 800N. Calculate the frequency of the wire when it sounds its fundamental note

200Hz

100Hz

4Hz

2Hz

Awọn alaye Idahun

F = $\frac{1}{2 L}$ $\sqrt{\frac{T}{m}}$

N:B m is mass per length

= $\frac{0.01}{0.5}$

= 0.02kgm-1

F = $\frac{1}{2 \times 0.5}$ $\sqrt{\frac{800}{0.02}}$

= 200Hz

Ka ìwé ẹ̀kọ́ nípa Work, Energy & Power (JAMB)

Ka ìwé ẹ̀kọ́ nípa Elasticity (JAMB)

Work, Energy & Power

Elasticity

Wo Idahun

Ibeere 44 Ìròyìn

When one arm of a U-tube manometer is connected to a gas supply, the levels of mercury in the two arms of the U-tube is shown in the figure above, if the atmospheric pressure is 76.0cm hg, the gas pressure is

62.6cm hg

72.5cm hg

79.5cm hg

85.9cm hg

Measurements And Units

Wo Idahun

Ibeere 45 Ìròyìn

E, F and G are yellow, red and cyan transparent light filters respectively. The color of a white opaque object when viewed through the arrangement of the filters above is

yellow

red

black

blue

Structure Of The Nucleus

Wo Idahun






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