JAMB UTME - Physics - 1992 | Green Bridge CBT

Question 1 Report

The speed of light in air is 3 x 108ms-1. What is the speed in glass with a refractive index of 1.50?

1.5 x 108ms-1

3.0 x 108ms-1

2.0 x 108ms-1

6.0 x 108ms-1

Electromagnetic Waves: Types Of Radiation In Electromagnetic Spectrum

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Question 2 Report

Calculate the force acting on an electron of charge 1.6 x 10-19C placed in an electric field of intensity 108Vm-1

1.6 x 10-11N

1.6 x 10-14N

1.6 x 10-16N

1.0 x 10-16N

Electric Field

Properties Of Waves: Reflection, Refraction, Diffraction

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Question 3 Report

A bridge made of steel is 600m long. What is the daily variation in its length if the night-time and daytime temperatures are 10oC and 35oC respectively. The linear expansivity of steel is 0.000012C-1

0.18cm

1.80cm

18.00cm

1800cm

Temperature And Its Measurement

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Question 4 Report

A 5-v battery is connected across the plates of a $2.0\,\mu\text{F}$ uncharged parallel plate capacitor. The charge on the capacitor after a long time is

2.5

μ

C

10.0

μ

C

20.0

μ

C

50.0

μ

C

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Question 5 Report

Which of the following factors has no effect on the e.m.f. of a primary cell?

temperature

size of the cell

nature of the plate

nature of the electrolyte

Electric Cells

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Question 6 Report

A platinum resistance thermometer wire has a resistance of 5 ohms at 0oC and 5.5 ohms at 100oC. Calculate the temperature of the wire when the resistance is 5.2 ohms

80oC

60oC

40oC

10oC

Answer Details

100oC .... 5.5

$θ$ oC .... 5.3

0oC .... 5.0

$\frac{θ - 0}{100 - 0}$ = $\frac{5.5 - 5 .0}{5.5 - 5.0}$

$θ$ = 40oC

Read lesson note on Temperature And Its Measurement (JAMB)

Temperature And Its Measurement

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Question 7 Report

After three half lifes, the fraction of a radioactive material that has decayed is

1

8

1

3

2

3

7

8

Electromagnetic Field (Part 2)

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Question 8 Report

How much heat is absorbed when a block of copper of mass 0.05kg and specific heat capacity 390Jkg-1K-1 is heated from 20oC to 70oC?

39 . 98 x 10-1J

9.75 x 102J

3.98 x 103J

9.75 x 103J

Heat Energy

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Question 9 Report

What is the least possible error in using a rule graduated in centimeters?

0.1cm

0.5cm

1.0cm

2.0cm

Measurements And Units

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Question 10 Report

Which of the following arrangements of the components of electromagnetic spectrum is in ascending order of wavelengths?

Gamma rays, ultraviolet rays, X- rays, infra - red rays

Gamma rays, X-rays, ultraviolet rays, infra-red rays

infra-red rays, ultraviolet rays, X-rays, gamma rays

Gamma rays, ultraviolet rays, infra-red rays, X-rays

Electromagnetic Waves: Types Of Radiation In Electromagnetic Spectrum

Electric Field

Light Waves

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Question 11 Report

A uniform light rod is kept in horizontal equilibrium under the influence of fore forces as shown above, which of the following equations correctly represents the condition of equilibrium for the rod

F1 + F2 = F3 + F4

F1 + F2 - F3 + F = 0

(F1 + F2)ab = (F3 + F4)cd

F1a + F2b - F3c - F4d = 0

Simple A.C Circuits

Equilibrium Of Forces

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Question 12 Report

Which of the following affects the period of a simple pendulum? i. mass of the pendulum bob. ii. length of the pendulum. iii. acceleration due to gravity.

i, ii, and iii

ii and iii only

i and iii only

i and ii only

Gravitational Field

Equilibrium Of Forces

Measurements And Units

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Question 13 Report

A capacitor of 10µF is connected across a cell of 12 volts as shown above, calculate the energy stored in the capacitor

7.2 x 10-4J

1.4 x 10-3J

1.2 x 10-2J

Capacitors

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Question 14 Report

Which of the following properties make the convex mirror useful as a driving mirror? i. the image is real. ii. the image is erect. iii. it has a wide field of view. iv. the image is magnified.

i, ii, and iv

i, ii, iii

ii and iii

i and iii

Electrostatics

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Question 15 Report

A man weight 800N climbs up a stairs to height of 15m in 12.5s. What is the man''s average power output?

667W

810W

960W

15000W

Current Electricity

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Question 16 Report

Which of the following statements is CORRECT about a long-sighted boy who does not put on glasses?

He cannot see distant objects clearly

Rays of light from a close object are focused in front of his retina

His eye ball is too long

Parallel rays of light are focused behind his retina

Description Property Of Fields

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Question 17 Report

The maximum permissible current through a galvanometer G of internal resistance $10\ \Omega$ is 0.05A. A resistance R is used to convert G into a voltmeter with a maximum reading of 100V. Find the value of R and how it is connected to G

20,000 ohms in parallel

19,990 ohms in series

1990 ohms in series

100 ohms in series

Current Electricity

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Question 18 Report

At constant pressure, the density of a fixed mass of gas is

constant with temperature

proportional to its volume

inversely proportional to its temperature

independent of its volume

Gas Laws

Temperature And Its Measurement

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Question 19 Report

Which of the following apparatus will require the smallest fuse rating for its protection?

60W, 240V

60W, 40V

40W, 12V

40W, 5V

Answer Details

I =

\frac{P}{V}

=

\frac{60}{240}

= 0.25A

I = $\frac{P}{V}$ = $\frac{60}{40}$ = 1.5A

I = $\frac{P}{V}$ = $\frac{40}{12}$ = 3.3A

I = $\frac{P}{V}$ = $\frac{40}{5}$ = 8A

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 20 Report

If a plastic sphere floats in water (density = 1000kgm3) with 0.5 of its volume submerged, and floats in oil with 0.4 of its volume submerged the density of the oil is

800kgm3

1200kgm3

1250kgm3

2000kgm3

Answer Details

R.d =

\frac{0.4}{0.5}

= 0.8

0.8 = $\frac{Density of oil}{Density of water}$

0.8 = $\frac{Density of oil}{1000}$

Density of oil = 800kgm3

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Question 21 Report

A note is the octave of another note if it has

a frequency twice that of the first note

frequency half that of the first note

the same fundamental frequency as the first one

a frequency frequency eight times that of the first note

Characteristics Of Sound Waves

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Question 22 Report

In the diagram above, the hanging mass m2 is adjusted until m1 is on the verge of sliding. The coefficient of static friction between the mass m1 and the table is

m1/m2

m1g/m2

m2/m1

m2g/m1

Friction

Equilibrium Of Forces

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Question 23 Report

The diagram above shows a meter bridge in which two of thee arms contain resistances R and 2Ω. A balance point is obtained at 60cm from the left end , calculate the value of R

1.2Ω

1.3Ω

3.0Ω

6.0Ω

Capacitors

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Question 24 Report

A body starts from rest and moves with uniform acceleration of 6ms-2. What distance does it cover in the third seconds

15m

18m

27m

30m

Motion

Speed And Velocity

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Question 25 Report

The figure above shows the heights of two liquids X and Y when some air is sucked out of the apparatus through the pump P. The diameter of the table in X is twice That of the Tube In Y. What is the relative density of the liquid X with respect to liquid Y

1/3

2/3

3

6

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Question 26 Report

One of the most important applications of bi-metallic strip is found in the construction of

a thermostat

an altimeter

a thermocouple

a hydrometer

Elasticity

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Question 27 Report

The heat produced in a conductor carrying an electric current is

inversely proportional to the current and the resistance

directly proportional to the current, resistance and the time

inversely proportional to of the resistance, current and the time

directly proportional to the square of the current, the resistance and the time

Current Electricity

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Question 28 Report

In A.C circuit theory, the root means square (r.m.s) current, Irms and the peak (maximum)current Io are related by

Io =

\frac{I_{r} m s}{\sqrt{2}}

Io =

\frac{I_{r} m s}{\sqrt{2}}

Irms =

\frac{\frac{I}{I_{o}}}{\sqrt{2}}

Irms =

\frac{I_{r} m s}{\sqrt{2}}

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Question 29 Report

The space between the double glass walls of a thermos flask is evacuated space are silvered. The residual source of heat loss takes place by

convection

radiation from the surface

conduction through the stopper and the glass

conduction across the walls

Heat Transfer

Temperature And Its Measurement

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Question 30 Report

The threshold of frequency for photoelectric effect depends on the

intensity of incident light

frquency of incident light

material of the photocathode

potential difference between the cathode and the anode

Properties Of Waves: Reflection, Refraction, Diffraction

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Question 31 Report

In an experiment to determine Young's Modulus for a wire, several loads are attached to the wire and the corresponding extension measured. The tensile stress in each case depends on the

load and the extension

load and the radius of the wire

radius of the wire and the extension

extension and the original length of the wire

Temperature And Its Measurement

Elasticity

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Question 32 Report

Which of the following characteristics of a wave is used in the measurement of the depth of the sea?

diffraction

interference

refraction

reflection

Production And Propagation Of Waves

Refraction Of Light Through Plane And Curved Surfaces

Properties Of Waves: Reflection, Refraction, Diffraction

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Question 33 Report

A block of ice floats on water inside a container. If the block of ice gets completely melted, the level of water in the container will

increase

remain the same

decrease

first decrease and then increase

Fluid At Rest

Change Of State

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Question 34 Report

In alternating current theory, the units of impedance, r.m.s. voltage and resonance frequency are respectively equal to

volt, ampere and hertz

ohms, volt and hertz

watt, ohms and radian

ohms, hertz and joule

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Question 35 Report

A stone, Q is thrown with velocity U at an angle of 75o to the horizontal. Another stone R is thrown with the same velocity U but with an angle of 15o to the horizontal. The ranges covered by the stones will be

greater for Q

greater for R

the same for Q and R

greater for the heavier of the two stones

Answer Details

Range =

\frac{U^{2} s i n 2 θ}{g}

RangeQ = $\frac{U^{2} s i n 150}{g}$

RangeR = $\frac{U^{2} s i n 30}{g}$

Since, sin30o = sin150o

therefore, RQ = RR

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Question 36 Report

The equation of a wave is y = 0.005 sin[x(0.5X - 200t)] where x and y are in meters and t is in seconds. What is the velocity of the wave?

4000ms-1

400ms-1

250ms-1

40ms-1

Answer Details

y = 0.005 sin[x(0.5X - 200t)]

compare to Y = A sin(kx - wt)

$λ$ = $\frac{2 π}{k}$ and F = $\frac{w}{2 π}$

V= $λ$ F

= $\frac{2 π}{0.5}$ x $\frac{200}{2 π}$

= 400ms-1

Read lesson note on Types Of Waves (WAEC)

Types Of Waves

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Question 37 Report

A concave mirror has a radius of curvature of 36cm. At what distance from the mirror should an object be placed to give a real image three times the size of the object?

12cm

24cm

48cm

108cm

Answer Details

F =

\frac{u v}{u + v}

v = 3u

18 = $\frac{3 u \times u}{3 u + u}$

u = 24cm

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

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

Reflection Of Light At Plane And Curved Surfaces

Properties Of Waves: Reflection, Refraction, Diffraction

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Question 38 Report

A wire of length $15\text{ m}$ made of a material of resistivity $1.8 \times 10^{-6}\ \Omega\text{m}$ has a resistance of $0.27\ \Omega$. Determine the area of the wire

1.5 x 10-4m2

1.0 x 10-4m2

2.7 x 10-5m2

7.3 x 10-6m2

Answer Details

Resistivity =

\frac{Resiatance x Area}{l e n g t h}

1.6 x 10-6 = $\frac{15 \times A r e a}{0.27}$

Area = 1.0 x 10-4m2

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Question 39 Report

The angle between the direction of the earth's magnetic field and the horizontal is called the

angle of deviation

magnetic declination

magnetic meridian

angle of dip

Magnets And Magnetic Fields

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Question 40 Report

A boy sits in a train moving with uniform speed on a straight track. If from his outstretched palm he gently tosses his coin upwards, the coin will fall

in front of his palm

behind his palm

beside his palm

into his palm

Scalars And Vectors

Motion

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Question 41 Report

A machine requires 1000J of work to raise a load of 500N through a vertical distance of 1.5m. Calculate the efficiency of the

80%

75%

50%

33%

Answer Details

\frac{500 \times 1.5}{100.0}

x 100%

= 75%

Read lesson note on Work, Energy And Power (WAEC)

Work, Energy And Power

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Question 42 Report

If the refractive index of a medium in air is 2.0, what is the critical angle for this medium?

30o

42o

45o

50o

Refraction Of Light Through Plane And Curved Surfaces

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Question 43 Report

What is the frequency of the sound made by a siren having a disc with 32 holes and making 25 revolution per seconds?

80Hz

600Hz

800Hz

1600Hz

Propagation Of Sound Waves

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Question 44 Report

The circuit diagram above contains four ammeters W, X, Y and Z, Which of the following statements about the ammeter readings is correct

The reading of W is equal to that of Y and twice that of X

The reading of Y is greater than that of Z

The readings of W and Y are equal and each is greater than that of X

The reading of Z is equal to the sum of the readings of Y and W

Current Electricity

Capacitors

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Question 45 Report

When an ebolite rod is rubbed with fur, it has

no charge at all

a negative charge

a positive charge

negative and positive charges

Properties Of Waves: Reflection, Refraction, Diffraction

Electrostatics

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Question 46 Report

When an object is placed very close to the pole of a concave mirror, the virtual image obtained is

diminished and upright

diminished and inverted

enlarged and inverted

enlarged and upright

Reflection Of Light At Plane And Curved Surfaces

Refraction Of Light Through Plane And Curved Surfaces

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Question 47 Report

The diagram above represents the field pattern obtained by bringing the poles of two magnets together.The poles must be

S-S poles

S-N poles

N-S poles

N-N poles

Magnetic Field (Part 2)

Electric Field

Magnets And Magnetic Fields

Electromagnetic Field (Part 2)

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Question 48 Report

PQRS is rectangular cell with PQ perpendicular to the magnetic field as shown above. If a current flows in the the direction PQRS in what direction will the coil move

Upwards

Downwards

TOwards The North Pole

Towards The South Pole

Electric Field

Electromagnetic Field (Part 2)

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