JAMB UTME - Physics - 1979 | Green Bridge CBT

Question 1 Rapport

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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Question 2 Rapport

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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Question 3 Rapport

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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Question 4 Rapport

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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Question 5 Rapport

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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Question 6 Rapport

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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Question 7 Rapport

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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Question 8 Rapport

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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Question 9 Rapport

The diagram shows lens arrangement in

A Compound Microscope

astronomical telescope

binocular

periscope

projection lantern

Optical Instruments

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Question 10 Rapport

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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Question 11 Rapport

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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Question 12 Rapport

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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Question 13 Rapport

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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Question 14 Rapport

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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Question 15 Rapport

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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Question 16 Rapport

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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Question 17 Rapport

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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Question 18 Rapport

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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Question 19 Rapport

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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Question 20 Rapport

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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Question 21 Rapport

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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Question 22 Rapport

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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Question 23 Rapport

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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Question 24 Rapport

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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Question 25 Rapport

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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Question 26 Rapport

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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Question 27 Rapport

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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Question 28 Rapport

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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Question 29 Rapport

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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Question 30 Rapport

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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Question 31 Rapport

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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Question 32 Rapport

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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Question 33 Rapport

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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Question 34 Rapport

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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Question 35 Rapport

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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Question 36 Rapport

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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Question 37 Rapport

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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Question 38 Rapport

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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Question 39 Rapport

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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Question 40 Rapport

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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Question 41 Rapport

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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Question 42 Rapport

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