JAMB UTME - Physics - 1979 | Green Bridge CBT

Tambaya 1 Rahoto

Which of the following electromagnetic waves has the shortest wavelength?

Radio waves

X-rays

Infra-red

Blue light

Ultraviolet

Electromagnetic Waves: Types Of Radiation In Elect

Structure Of The Atom (Nigeria Only)

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Tambaya 2 Rahoto

Which of the following statements is correct? Silvered walls of a vacuum flask are used to prevent

heat loss due to conduction

vacuum loss

heat entry into the inner flask due to convection

heat loss due to radiation

heat loss due to convection

Heat Energy

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Tambaya 3 Rahoto

For the wave motion represented above

The wavelength is given by

p

q

r

s

t

Production And Propagation Of Waves

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Tambaya 4 Rahoto

In a given circuit, the cell P has an emf 1.5V and an unknown internal resistance while cell Q has an emf 2.0V and an internal resistance of 1 ohm if the ammeter reads 50m A, Then r is equal to

0.5 ohm

0.62 ohm

1.0 ohm

2.0 ohm

3.0 ohm

Capacitors

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Tambaya 5 Rahoto

Which of the following statements is correct? The magnetized state of an iron bar can be destroyed completely by

heating the bar to a high temperature

breaking the bar

connecting opposite poles with a small piece of iron

placing the bar inside a strong magnetic field

none of the above

Magnets And Magnetic Fields

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Tambaya 6 Rahoto

An air bubble rises from the bottom to the top of a water dam which is 40m deep. The volume of the bubble just below the surface is 2.5cm³. Find its volume at the bottom of the dam, if atmospheric pressure is equivalent to 10m water

0.0cm³

2.0cm³

1.6cm³

0.625cm³

0.5cm³

Motion

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Tambaya 7 Rahoto

An electrical circuit is connected up as shown above, which of the following is correct about the value of current flowing through the 1 ohm resistance?

12/13A

13/12A

1/3A

3A

12/7A

Current Electricity

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Tambaya 8 Rahoto

A uniform bean HK of length 10m and weighing 200N is supported at both ends as shown above. A man weighing 1000N stands at a point P on the beam. If the reactions at point H an K respectively are 800N and 400N, Then the distance HP is

4m

3.5m

3m

6 \frac{2}{3}

m

7m

Equilibrium Of Forces

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Tambaya 9 Rahoto

Consider a thick glass tumbler and a thin glass tumbler which are made of the same kind of glass. Some hot liquid is poured into them. Which of the following statements is correct?

the thick tumbler is less likely to crack because it is stronger

the thick tumbler is less likely to crack because it insulates the heat beter, glass being a poor conductor of heat

Both tumblers are equally likely to crack because they are made of the same kind of glass

the thick tumbler is more likely to crack because uneven expansion persists for a longer time within the thicker glass

the thick tumbler is more likely to crack because it is heavier

Temperature And Its Measurement

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Tambaya 10 Rahoto

Which of the following types of waves cannot travel through a vacuum?

sound waves

light waves

infra-red waves

x-radiation

redio waves

Sound Waves

Electromagnetic Waves: Types Of Radiation In Elect

Types Of Waves

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Tambaya 11 Rahoto

If a given mass at constant pressure obeys the relation...volume is proportional to the absolute temperature...the gas is said to obey

Hooke's Law

Boyle's Law

Dalton's Law

Charles' Law

Newton's Law

Gas Laws

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Tambaya 12 Rahoto

When the vapour of a substance is in equilibrium with its own liquid, it is said to be

gaseous

unsaturated

liquefied

diffused

saturated

Vapours

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Tambaya 13 Rahoto

Two closed vessels contain equal volumes of boiling water and are identical except that one is blackened on the outside while the other is polished. Which of the following is correct?

the polished vessel will cool faster because a polished surface is a good radiator

the polished vessel will cool faster because it will absorbe less heat from the room

the black vessel will cool faster because it is a better conductor of heat

the polished vesselwill cool faster because it reflects heat better

the black vessel will cool faster because a black surface radiates heat faster than a polished one

Heat Energy

Characteristics Of Sound Waves

Pressure

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Tambaya 14 Rahoto

It is known that a neutron exists in a light atomic nucleus. Which of the following also exists in the nucleus?

an electron

a

\beta

-particle

an

\alpha

-particle

a proton

an atom

Wave-particle Paradox

Structure Of The Atom (Nigeria Only)

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Tambaya 15 Rahoto

The temperature at which the water vapour present in the air saturates the air and begins to condense is known as

boiling point

melting point

triple point

dew point

critical temperature

Temperature And Its Measurement

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Tambaya 16 Rahoto

Which of the following statements defines correctly the efficiency of a machine?

the load carried by the machine divided by effort required in carrying the load

the distance moved by the load divided by the distance moved by the effort

the useful work done by the machine divided by the total work put into the machine

the movement of the load divided by the movement of the effort about the same point

the temperature at the end of the application of the machine divided by the initial temperature

Work, Energy And Power

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Tambaya 17 Rahoto

Which of the following statements is correct? The reading of pressure on a mercury barometer is independent of

the cross-sectional area of the tube

the atmospheric pressure

the density of mercury

the temperature of mercury

the acceleration due to gravity

Pressure

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Tambaya 18 Rahoto

A weight of 1000 grams hangs from a lever 20cm to the fulcrum. At the left is a 500-gram weight 20cm from the fulcrum, and a 200-gram weight x cm away from the fulcrum. What is the value of x that will make the lever balanced?

50cm

20cm

10cm

30cm

70cm

Equilibrium Of Forces

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Tambaya 19 Rahoto

In what range of temperature is the expansion of water anomalous?

+208^oC to +212^oC

-80^oC + -76^oC

-4^oC to 0^oC

+96^oC to +100^oC

0^oC to +4^oC

Temperature And Its Measurement

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Tambaya 20 Rahoto

A concave lens of focal length 20cm form an image 1/2 the size of the object. The object distance is

100cm

\frac{100}{q}

60cm

\frac{60}{7}

None of the above

Electrostatics

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Tambaya 21 Rahoto

Radio carrier waves are generated by causing electrons to oscillate rapidly in

a microphone

a television camera

an antenna

coaxial cables

a transmitter

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Tambaya 22 Rahoto

An electric cell has an internal resistance of 2 ohms. A current of 0.5A is found to flow when a resistor of 5 ohms resistance is connected across it. What is the electromotive force of the cell?

5 volts

3.5 volts

2.5 volts

1 volts

10 volts

Current Electricity

Electric Cells

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Tambaya 23 Rahoto

All the heat generated in a 5 ohms resistor by 2A flowing for 30 seconds is used to evaporate 5g of a liquid at its boiling point. Which of the following is the correct value of the specific latent heat of the liquid?

120J

60Jg^-1

120Jg^-1

1500J

1500Jg^-1

Heat Energy

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Tambaya 24 Rahoto

fig 10 shows a see-saw which is perfectly in balance, the weighs of the people sitting on it are 50kg, xkg and 15kg as shown, the sit at distances of 1.5, 1.5 and 2m from the pivot respectively. The vale of X is

30

35

70

24.25

impossible to find

Equilibrium Of Forces

Motion

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Tambaya 25 Rahoto

Which of the following statements is true? The frequency of a vibrating string is

proportional to its length

inversely proportional to the tension within it

proportional to the aptitude of vibration

inversely proportional to its cross-section

proportional to the square root of the tension within it

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Tambaya 26 Rahoto

The density 400cm³ of palm oil was 0.9gcm^-3 before frying. If the density of the oil was 0.6gm^-3 after frying,assuming no loss of oil due to spilling, its new volume was

360cm³

600cm³

240cm³

800cm³

450cm³

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Tambaya 27 Rahoto

A landlord has eight 40W electric light bulbs, four 60W bulbs and two 100W bulb in his house. If he has all the points on for five hours daily and if N.E.P.A. charges 5k per unit, his bill for 30 days is

N5.70

N7.23

N3.65

N8.05

N4.50

Electrical Energy And Power

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Tambaya 28 Rahoto

Fig 8 shows a current I flowing in a copper wire situated in a magnetic field existing between the pole-pieces of a horse-shoe magnet.
Which of the following statements is correct?

The wire will experience a force in the direction into the paper

The wire will experience a force in the direction out of the paper

The wire will vibrate in a direction into and out of the paper

the wire will move in the direction of the field i.e toward the s-pole

the wire will not move because it is made of copper which is non magnetic

Electric Field

Electromagnetic Field (Part 1)

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Tambaya 29 Rahoto

Which of the following is the correct definition of 'half-life'?

the average life-time of a radioactive material

the time it takes a radioactive material to decay to half of its original quantity

half the period a radioactive material decays completely

half of the decay constant

the decay constant times life-time

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Tambaya 30 Rahoto

The speed of light in air is 3 x 10⁸ms^-1. If the refractive index of light from air-to-water is $\frac{4}{3}$ , then which of the following is the correct value of the speed of light in water?

4 x 10⁸ms^-1

2.25 x 10⁸ms^-1

\frac{4}{9}

x 10⁸ms^-1

2.25 x 10²ms^-1

4.33 x 10⁸ms^-1

Refraction Of Light Through At Plane And Curved

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Tambaya 31 Rahoto

A capacitor and a resistor are connected in series with each other and in series with an accumulator of negligible internal resistance. The potential across the terminals of the capacitor is

twice the e.m.f of the accumulator

less than the e.m.f by the potential drop across the resistor

zero

the same as the e.m.f.

greater than

Capacitors

Simple A.C Circuits

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Tambaya 32 Rahoto

If in a simple pendulum experiment the length of the inextensible string is increased by a factor of four, its period is increased by a factor of

4

\frac{\pi}{2}

\frac{1}{4}

2

\pi

2

Scalars And Vectors

Equilibrium Of Forces

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Tambaya 33 Rahoto

On which of the following is the operation of a moving coil galvanometer based?

Magnetic effect of electric current

Electromagnetic induction

Chemical reaction produced by electricity

Force on current carrying conductor in a magnetic field

Electrical energy and power

Newton’s Laws Of Motion

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Tambaya 34 Rahoto

A 500kg car which was initially at rest travelled with an acceleration of 5m sec^-2, its kinetic energy after 4 seconds was

10⁵J

2.5 x 10³J

2 x 10³J

5 x 10³J

5 x 10^5J`

Newton’s Laws Of Motion

Motion

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Tambaya 35 Rahoto

An object is placed 30cm from a concave mirror of focal length 15cm. the linear magnification of the image produced is

o

\frac{2}{3}

1

2

3

Electrostatics

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Tambaya 36 Rahoto

What are the units of thermal conductivity?

kg.m.sec²

Joule sec^-1m^-1k^-1

kg.m

Newton sec^-1m²

m³

Measurements And Units

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Tambaya 37 Rahoto

The diagram shows lens arrangement in

A Compound Microscope

astronomical telescope

binocular

periscope

projection lantern

Optical Instruments

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Tambaya 38 Rahoto

Which of the following statements about radioactivity are true? i. alpha particle is positively charged ii. Beta particle is negatively charged iii. Gamma ray is neutral iv. Beta particle has the same mass as helium atom v. Gamma ray is charged

i, ii, iii and iv only

iv and v only

i, ii and iii only

i, ii and v only

all

Structure Of The Atom (Nigeria Only)

Electromagnetic Field (Part 2)

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Tambaya 39 Rahoto

In a resonance tube experiment, which is illustrated above, the velocity of sound in air is 327.68m/s, the frequency of the turning fork used is therefore

128HZ

256HZ

512HZ

768HZ

1024HZ

Rectilinear Acceleration

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Tambaya 40 Rahoto

The heights of the mercury thread in a mercury-in-glass thermometer when in melting ice and then in steam are 3cm and 18cm respectively. At a temperature of 60^oC the height would be

7.5cm

9cm

10.8cm

12cm

12.6cm

Temperature And Its Measurement

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Tambaya 41 Rahoto

Which of the following statements is incorrect? The sensitivity of a galvanometer which incorporates an optical lever arrangement may be increased by providing

a larger number of turns in the coil

a thinner suspension with a small torsional control

a special alloy permanent magnet which gives a high magnetic flux

all of the above

a light source with a greater intensity

Capacitors

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Tambaya 42 Rahoto

fig 12 shows the velocity time graph of a car which starts from rest and is accelerated uniformly at the rate of 3m sec^-2 for 5 seconds. It attains a velocity which is maintained for a minute, The car is then brought to rest by a uniform retardation after another 3 seconds. calculate the total distance covered

900m

1920m

960m

860m

Motion

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Tambaya 43 Rahoto

A man standing between two parallel mirrors in a barber's shop will see the following number of his own image

eight

two

four

one

infinite

Electrostatics

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Tambaya 44 Rahoto

If the wavelength of a wave travelling with a velocity of 360ms^-1 is 60cm, the period of the wave is

6s

3.6s

0.17s

0.61s

3s

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Tambaya 45 Rahoto

In an electrolysis experiment, a cathode of mass 5g is found o weigh 5.01g after a current of 5A flows for 50 seconds. What is the electrochemical equivalent of the deposited substance?

0.00004g/C

0.00002g/C

0.02500g/C

0.05000g/C

0.00001g/C

Electrostatics

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Tambaya 46 Rahoto

A body is released from rest and allowed to fall freely from a given height under gravity. The kinetic energy at its half-way point is

a little above half of its initial energy

a little below half of its initial energy

a half of its initioal energy

a little above its initial energy

a little below its initial energy

Gravitational Field

Work, Energy And Power

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Tambaya 47 Rahoto

An air column 10cm in length is trapped into the sea end of a capillary tube by a 15cm column of mercury with the tube held vertically as shown above. On inverting the tube the air column becomes 15cm long. The atmospheric pressure during the experiment is

90cm

76cm

75cm

60cm

50cm

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Tambaya 48 Rahoto

The bulb of a motorcycle head-lamp is marked 40W, 6V. The resistance of the filament when it is switched on is

\frac{6^2}{40^2}

ohms

\frac{40}{6^2}

ohms

\frac{40}{6}

ohms

6 x 40 ohms

\frac{6^2}{40}

ohms

Current Electricity

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