JAMB UTME - Physics - 1988 | Green Bridge CBT

Swali 1 Ripoti

A dynamo primarily combines

mechanical energy into electrical energy

electrical energy into kinetic energy

potential energy into kinetic energy

kinetic energy into potential energy

Tazama Jibu

Swali 2 Ripoti

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

Tazama Jibu

Swali 3 Ripoti

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

90∘

60∘

45∘

30∘

Electrostatics

Tazama Jibu

Swali 4 Ripoti

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

force

power

energy

accelaration

Maelezo ya Majibu

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

= Nm

Soma maelezo ya somo kwenye Measurements And Units (JAMB)

Measurements And Units

Tazama Jibu

Swali 5 Ripoti

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

Tazama Jibu

Swali 6 Ripoti

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

Tazama Jibu

Swali 7 Ripoti

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)

Tazama Jibu

Swali 8 Ripoti

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

Tazama Jibu

Swali 9 Ripoti

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)

Tazama Jibu

Swali 10 Ripoti

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

Maelezo ya Majibu

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

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

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

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

Soma maelezo ya somo kwenye Motion (JAMB)

Motion

Tazama Jibu

Swali 11 Ripoti

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

Tazama Jibu

Swali 12 Ripoti

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%

Maelezo ya Majibu

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

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

= 75%

Soma maelezo ya somo kwenye Current Electricity (JAMB)

Current Electricity

Tazama Jibu

Swali 13 Ripoti

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

Maelezo ya Majibu

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

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

Soma maelezo ya somo kwenye Current Electricity (JAMB)

Soma maelezo ya somo kwenye Scalars And Vectors (JAMB)

Current Electricity

Scalars And Vectors

Tazama Jibu

Swali 14 Ripoti

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

Tazama Jibu

Swali 15 Ripoti

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

Tazama Jibu

Swali 16 Ripoti

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

Tazama Jibu

Swali 17 Ripoti

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)

Tazama Jibu

Swali 18 Ripoti

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

Maelezo ya Majibu

$μ$ mg = ma

$μ$ x 10 x 10 = 10 x 0.2

$μ$ = 0.02

Soma maelezo ya somo kwenye Newton’s Laws Of Motion (WAEC)

Soma maelezo ya somo kwenye Measurements And Units (JAMB)

Newton’s Laws Of Motion

Measurements And Units

Tazama Jibu

Swali 19 Ripoti

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

Maelezo ya Majibu

power = mgh

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

t = 52.8 sec

Soma maelezo ya somo kwenye Work, Energy And Power (WAEC)

Work, Energy And Power

Tazama Jibu

Swali 20 Ripoti

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

Tazama Jibu

Swali 21 Ripoti

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

Maelezo ya Majibu

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

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

= 25m

Soma maelezo ya somo kwenye Motion (JAMB)

Motion

Tazama Jibu

Swali 22 Ripoti

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 Electromagnetic Spectrum

Light Waves

Tazama Jibu

Swali 23 Ripoti

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

Maelezo ya Majibu

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

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

v = 20ms-1

Soma maelezo ya somo kwenye Equilibrium Of Forces (WAEC)

Equilibrium Of Forces

Tazama Jibu

Swali 24 Ripoti

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

Tazama Jibu

Swali 25 Ripoti

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

Tazama Jibu

Swali 26 Ripoti

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

Tazama Jibu

Swali 27 Ripoti

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

Tazama Jibu

Swali 28 Ripoti

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

Tazama Jibu

Swali 29 Ripoti

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 Plane And Curved Surfaces

Tazama Jibu

Swali 30 Ripoti

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

Maelezo ya Majibu

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

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

v = -30cm

Soma maelezo ya somo kwenye Electrostatics (JAMB)

Electrostatics

Tazama Jibu

Swali 31 Ripoti

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

Tazama Jibu

Swali 32 Ripoti

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

Maelezo ya Majibu

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

Soma maelezo ya somo kwenye Work, Energy & Power (JAMB)

Soma maelezo ya somo kwenye Elasticity (JAMB)

Work, Energy & Power

Elasticity

Tazama Jibu

Swali 33 Ripoti

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)

Tazama Jibu

Swali 34 Ripoti

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

Maelezo ya Majibu

Heat lost = heat gained

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

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

= $\frac{7}{3}$

Soma maelezo ya somo kwenye Heat Energy (WAEC)

Heat Energy

Tazama Jibu

Swali 35 Ripoti

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

Maelezo ya Majibu

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

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

v = 360 rev s-1

Soma maelezo ya somo kwenye Motion (JAMB)

Soma maelezo ya somo kwenye Mass And Weight (WAEC)

Motion

Mass And Weight

Tazama Jibu

Swali 36 Ripoti

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

Tazama Jibu

Swali 37 Ripoti

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

Tazama Jibu

Swali 38 Ripoti

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

Tazama Jibu

Swali 39 Ripoti

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

Maelezo ya Majibu

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

F1 = 86.6N

Soma maelezo ya somo kwenye Scalars And Vectors (WAEC)

Scalars And Vectors

Tazama Jibu

Swali 40 Ripoti

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

orange

green

violet

red

Tazama Jibu

Swali 41 Ripoti

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

a proton

an electron

a neutron

a gamma ray

Maelezo ya Majibu

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