JAMB UTME - Physics - 1982 | Green Bridge CBT

Question 1 Report

Which of the following statements is NOT true of \(\gamma\)-rays?

\(\gamma\)-rays belong to the electromagnetic spectrum

\(\gamma\)-rays do not carry an electron charge

\(\gamma\)-rays obey the inverse cube law in air Correct answer

the thickness of aluminium which stops b-particule has a negligible effect on \(\gamma\)-radiation

the difference between \(\gamma\)-rays and X-rays is that \(\gamma\)-rays originate from energy charges in the nuclei of atoms, while X-rays comes from energy charges associated with the electron structure of atoms

Answer Details

Read lesson note on Electromagnetic Waves: Types Of Radiation In Electromagnetic Spectrum (WAEC)

Electromagnetic Waves: Types Of Radiation In Electromagnetic Spectrum

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Question 2 Report

An electric iron is rated at 1000watts, 250v. The corresponding maximum resistance and accompanying current is

62.5A, 4.0\(\Omega\)

16.0A, 62.5\(\Omega\)

62.5A, 16.0\(\Omega\)

4.0A, 62.5\(\Omega\) Correct answer

4.0A, 250\(\Omega\)

Answer Details

Read lesson note on Current Electricity (JAMB)

Current Electricity

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Question 3 Report

The force responsible for holding the moon in its orbit around the earth against the gravitational pull of the earth is

centrifugal

rotational

reaction

centripetal Correct answer

tractional

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Question 4 Report

Which of the following statements is NOT true? Thermostats are used to control the temperature of

pressure cookers Correct answer

laundry irons

hot water storage tanks

aquaria for tropical fish

heated apartments

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Question 5 Report

A hot metal ball is suspended in the open air. As it cools it loses heat by

conduction only

convection only Correct answer

radiation only

conduction and convection

convection and evaporation

Answer Details

Read lesson note on Heat Transfer (JAMB)

Read lesson note on Simple A.C Circuits (JAMB)

Heat Transfer

Simple A.C Circuits

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Question 6 Report

If the refractive index of a medium is V2, what is the critical angle?

45^o Correct answer

50^o12'

56^o25'

75^o

90^o

Answer Details

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

Read lesson note on Refraction Of Light Through Plane And Curved Surfaces (JAMB)

Reflection Of Light At Plane And Curved Surfaces

Refraction Of Light Through Plane And Curved Surfaces

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Question 7 Report

The range of accommodation of a normal human eye is

0m to 0.1m

0m to 0.25m

0.10m to 0.25m

0.10m to infinity

0.25m to infinity Correct answer

Answer Details

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Question 8 Report

The value of the series resistor required to convert the above galvanometer into a voltmeter with a full range deflection of 15V is

985 ohms

990 ohms

995 ohms Correct answer

1000 ohms

1005 ohms

Answer Details

Read lesson note on Capacitors (JAMB)

Read lesson note on Simple A.C Circuits (JAMB)

Capacitors

Simple A.C Circuits

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Question 9 Report

The area under a force-distance graph represents

acceleration

velocity

power

work Correct answer

momentum

Answer Details

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

Work, Energy And Power

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Question 10 Report

When equal weights of iron and water are subjected to equal supply of heat, it is found that the piece of iron become more hotter than water after a short time because

the specific heat of iron is higher than that of water

iron is in solid form

water is in liquid form

the specific heat of water is higher than that of iron Correct answer

the specific heat of iron is infinite

Answer Details

Read lesson note on Quantity Of Heat (JAMB)

Read lesson note on Measurements And Units (JAMB)

Quantity Of Heat

Measurements And Units

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Question 11 Report

a body is acted upon by forces applied at points P and Q as shown above their resultant is equal to

2√5N in adirection N 56◦ E

2√5N in adirection N 56◦ W

2√13N in adirection N 56◦ E

Correct answer

2√13N in adirection N 56◦ W

√10N in adirection N 56◦ E

Answer Details

Read lesson note on Scalars And Vectors (JAMB)

Scalars And Vectors

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Question 12 Report

A hydrometer is an instrument for measuring the

depth of water in a vessel

relative density of a liquid by the method of flotation Correct answer

relative dendity of a liquid by finding the apparent loss in weight

relative humidity of the air

atmospheric pressure when the air is humid

Answer Details

A hydrometer is an instrument used to measure the relative density of a liquid by the method of flotation. It consists of a graduated glass tube with a weight at the bottom to make it float vertically in the liquid. The level at which the surface of the liquid touches the scale on the tube is a measure of the relative density of the liquid. Hydrometers are commonly used in industry and laboratories to measure the density of liquids such as acids, alkalis, and electrolytes.

Read lesson note on Liquids At Rest (JAMB)

Read lesson note on Measurements And Units (JAMB)

Liquids At Rest

Measurements And Units

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Question 13 Report

what is the resultant resistance in the circuit given above

11Ω

8Ω Correct answer

4Ω

3.6Ω

4.3Ω

Answer Details

Read lesson note on Capacitors (JAMB)

Capacitors

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Question 14 Report

The equation P^xV^yT^z = constant

x = 0, y = 0, z = 1

x = 1, y = 0, z = 0

x = 1, y = 1, z = 0

x = 1, y = 1, z = 1

x = 1, y = 1, z = -1 Correct answer

Answer Details

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Question 15 Report

A 10g mass placed on the pan of a spring balance causes an extension of 5cm. If a 15g mass is placed on the pan of the same spring balance, the extension is

3.3cm

6.5cm

7.5cm Correct answer

10.8cm

15.0cm

Answer Details

Read lesson note on Scalars And Vectors (JAMB)

Read lesson note on Elasticity (JAMB)

Scalars And Vectors

Elasticity

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Question 16 Report

a body of mass 10kg on a smooth inclined plane is connected to a smooth pulley to a mass of 15kg as shown above, the acceleration of the system is

1/4g

8/25g

1/2g

2/5g Correct answer

3/4g

Answer Details

Read lesson note on Scalars And Vectors (JAMB)

Scalars And Vectors

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Question 17 Report

The echo of a sounder from the bottom of an ocean is heard 2.5 seconds later. If the speed of sound in water is 1,400ms^-1, the depth of the ocean is

1,750m Correct answer

3,500m

1,400m

2,800m

2,100m

Answer Details

Read lesson note on Current Electricity (JAMB)

Read lesson note on Sound Waves (WAEC)

Read lesson note on Propagation Of Sound Waves (JAMB)

Current Electricity

Sound Waves

Propagation Of Sound Waves

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Question 18 Report

A high-resistance voltmeter reads 3.0V when connected across the terminals of a battery on open circuit and 2.6V when the battery supplies a current of 0.2A through a lamp. The resistance of lamp is

2.00\(\Omega\)

13.00\(\Omega\) Correct answer

0.52\(\Omega\)

0.13\(\Omega\)

1.50\(\Omega\)

Answer Details

Read lesson note on Electrostatics (JAMB)

Electrostatics

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Question 19 Report

The point beyond which a stretched spring does not return to its original length is called the

breaking point

elastic limit Correct answer

spring constant

elasticity point

release point

Answer Details

Read lesson note on Elasticity (JAMB)

Elasticity

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Question 20 Report

As a positively charge rod is brought nearer to the top cap of a positively charged gold leaf electroscope, the divergence of the leaves will

decrease to zero

steadily increase Correct answer

decrease to zero and then increase

remain constant

increase to a maximum and then decrease

Answer Details

Read lesson note on Electrostatics (JAMB)

Electrostatics

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Question 21 Report

In copper plating, a current of 0.5A is allowed for cathode area of 100cm². If this current is maintained constant for 100 minutes, the thickness of the copper deposited will be approximately (the electrochemical equivalent of copper = 0.0003g/^oC, density of copper = 10^-4g/cm³ )

10^-2mm

10^-3mm

10^-4mm

10^-5mm

10^-6mm Correct answer

Answer Details

Read lesson note on Current Electricity (JAMB)

Current Electricity

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Question 22 Report

The water manometer above is measuring the pressure of gas supply. if the specific gravity of mercury is 13.6 and the atmospheric pressure is 70cm of mercury what is the total pressure of the gas supply in cm of water

67cm

73cm Correct answer

949cm

952cm

955cm

Answer Details

Read lesson note on Pressure (JAMB)

Read lesson note on Measurements And Units (JAMB)

Pressure

Measurements And Units

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Question 23 Report

A Uniform beam PQ of mass 20kg and length 5m is balanced as shown above, a man of weight 800N stands at M such that QM = 2m. The reaction at P and Q respectively are(take g = 10ms^-2)

300N and 500N

420N and 580N Correct answer

220N and 380N

580N and 420N

382N and 220N

Answer Details

Read lesson note on Scalars And Vectors (JAMB)

Read lesson note on Equilibrium Of Forces (WAEC)

Scalars And Vectors

Equilibrium Of Forces

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Question 24 Report

A mango fruit drops from a branch 10m above the ground, just before hitting the ground its velocity is (g = 10ms^-2)

10√2ms^-1 Correct answer

10ms^-1

100ms^-1

5√2ms^-1

200ms^-1

Answer Details

Read lesson note on Motion (JAMB)

Motion

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Question 25 Report

A rocket burns 0.01kg of fuel each second and ejects it as a gas with a velocity of 5,000m/s. What force does the gas exert on the rocket?

500,000N

500N

50N Correct answer

5,000N

50,000N

Answer Details

Read lesson note on Gravitational Field (JAMB)

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

Gravitational Field

Work, Energy And Power

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Question 26 Report

Two mirrors of the same length are arranged as shown above, a ray of light NO strikes the system at O and emerges along PQ. The emergent ray has been deviated through

220 degrees

200 degrees

210 degrees

180 degrees Correct answer

230 degrees

Answer Details

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

Reflection Of Light At Plane And Curved Surfaces

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Question 27 Report

in the image above, an incident ray XY makes an angle of 15\( ^{\circ} \) with a fixed line AY which is normal to surface of a plane mirror if the mirroe is turned as indicated by the arrow through \( 40^{\circ} \) what angle will the reflected ray make with AY

\( 25^{\circ} \)

\( 40^{\circ} \)

\( 15^{\circ} \)

\( 55^{\circ} \) Correct answer

\( 95^{\circ} \)

Answer Details

Read lesson note on Electrostatics (JAMB)

Electrostatics

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Question 28 Report

A man stands on a spring scale placed in a lift. The lift descends at constant velocity. As a result, the scale reads a weight

greater than the weight of the man

the same as the weight of the man Correct answer

of zero

less than the weight of the man

greater than the weight of the man by 1kg

Answer Details

Read lesson note on Gravitational Field (JAMB)

Gravitational Field

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Question 29 Report

The hatch door of a submarine has an area of 0.5m². The specific gravity of sea water is 1.03. Assume that g = 10ms^-1,and neglect the atmospheric pressure. The force exerted by the sea water on the hatch door at a depth of 200m is

1.03 x 10⁵N

1.03 x 10⁴Nm^-2

1.06 x 10⁵Nm^-2

2.06 x 10⁶N

1.03 x 10³N Correct answer

Answer Details

Read lesson note on Pressure (JAMB)

Pressure

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Question 30 Report

the arrow represents an object in front of a convex mirror whose focal points are X and Y. The image formed is

between X and P

Between P and Y Correct answer

Between Y and Z

Outside W

Outside Z

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Question 31 Report

Why does a piece of cork float on water?

there is no upthrust on it when completely immersed in water

the upthrust on it when completely immersed in water is greater than its weight in air

the upthrust on it when completely immersed in water is less than its weight in air Correct answer

its specific gravity is greater than that of water

its specific gravity is the same as that of water

Answer Details

Read lesson note on Measurements And Units (JAMB)

Measurements And Units

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Question 32 Report

A heater marked 50W will evaporate 0.005kg of boiling water in 50 seconds. The specific latent heat of vaporization of water in J/kg is

5.0 x 10⁶

1.0 x 10⁶

2.5 x 10⁶

2.5 x 10⁵

5.0 x 10⁵ Correct answer

Answer Details

Read lesson note on Quantity Of Heat (JAMB)

Quantity Of Heat

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Question 33 Report

The accurate measurement of the relative density of substances in powder or granular form can be done using a beam balance and a

pipette

burette

measuring cylinder

density

bottle Correct answer

Answer Details

Read lesson note on Temperature And Its Measurement (JAMB)

Read lesson note on Measurements And Units (JAMB)

Temperature And Its Measurement

Measurements And Units

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Question 34 Report

Which of the following statements is true of a body which is moving in a straight line with uniform acceleration? The velocity of the body

is also uniform

must always be zero when the body stops accelerating

will increase with time in the direction of the acceleration Correct answer

is equal to the quotient of distance travelled and time

is the product of the distance travelled and time

Answer Details

Read lesson note on Simple Harmonic Motion (WAEC)

Read lesson note on Motion (JAMB)

Read lesson note on Equilibrium Of Forces (WAEC)

Simple Harmonic Motion

Motion

Equilibrium Of Forces

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Question 35 Report

One of the following readings represents the measurement of the length of a metal rod using vernier callipers, Taking the reading accuracy into consideration, the most likely one is

5.15cm Correct answer

5.165cm

5.0cm

5.160cm

5cm

Answer Details

Read lesson note on Measurements And Units (JAMB)

Measurements And Units

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Question 36 Report

250g of lead at 170^oC is dropped into 100g of water at 0^oC. If the final temperature is 12^oC, the specific heat of lead is (specific heat of water is 4,200J/kg^oC)

39.5J/kg^oC

50.4J/kg^oC

127.6J/kg^oC Correct answer

154.6J/kg^oC

173.4J/kg^oC

Answer Details

Read lesson note on Temperature And Its Measurement (JAMB)

Temperature And Its Measurement

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Question 37 Report

The tyre pressure of a car was found to be 150cmHg in the morning at a temperature of 27°C. Hard driving in the afternoon raised the temperature of the tyres by 57°C. The tyre pressure had by the afternoon was

increased by 15.0cm Hg Correct answer

decreased by 15.0cm Hg

increased by 22.50cm

decreased by 22.50cm Hg

remained constant

Answer Details

Read lesson note on Pressure (JAMB)

Pressure

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Question 38 Report

In a radioactive series

\( ^{235} _{92}L \to ^{235} _{92}M \to ^{231} _{90}N \to ^{231} _{91}\phi \)

The particles emitted are respectively

\( \beta , \beta , \alpha \)

\( \alpha , \gamma , \beta \)

\( \gamma , \alpha , \beta \) Correct answer

\( \alpha , \alpha , \beta \)

\( \beta , \alpha , \beta \)

Answer Details

Read lesson note on Structure Of The Atom (Nigeria Only) (WAEC)

Structure Of The Atom (Nigeria Only)

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Question 39 Report

An object 15cm high is 30cm from pin-hole camera. If the height of the image formed at the back of the camera is 10cm, the image distance is

20cm Correct answer

45cm

54cm

63cm

70cm

Answer Details

Read lesson note on Fluid At Rest (WAEC)

Fluid At Rest

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Question 40 Report

what is the resultant capacity of the circuit

1.5µF Correct answer

18.0µF

6.0µF

6.8µF

8.83µF

Answer Details

Read lesson note on Capacitors (JAMB)

Read lesson note on Simple A.C Circuits (JAMB)

Capacitors

Simple A.C Circuits

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Question 41 Report

Two taxis leave benin and agbor some 80km apart at 1200hr as shown above. from the distance time graph shown the distance of their meeting point P, from Benin and the time of their meeting are

27km, 1218hr

29km, 1315hr Correct answer

40km, 1418hr

53km, 1436hr

60km, 1500hr

Answer Details

Read lesson note on Motion (JAMB)

Motion

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Question 42 Report

A magnetic needle is suspended first at the earth's north magnetic pole and then at a point on the magnetic equator. The respective angles between the needle and the horizontal are

0^o and 0^o

60^o and 60^o

90^o and 90^o

90^o and 0^o Correct answer

0^o and 90^o

Answer Details

Read lesson note on Magnets And Magnetic Fields (JAMB)

Magnets And Magnetic Fields

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Question 43 Report

The combination of sound waves with different frequencies is known as

interference