JAMB UTME - Physics - 1986 | Green Bridge CBT

Ibeere 1 Ìròyìn

A heavy object is suspended from a string and lowered into water so that it is completely submerged. The object appears lighter because

the density of water is less than that of the object

the pressure is low just below the water surface

it experiences an upthrust

the tension in the string neutralizes part of the weight

Wo Idahun

Ibeere 2 Ìròyìn

In an experiment in which molten naphthalene is allowed to cool, the cooling curve in fig 5 was obtained, the temperature $80^{\circ} C$ is known as

cooling temperature

boiling point

melting point

vaporization point

Quantity Of Heat

Temperature And Its Measurement

Wo Idahun

Ibeere 3 Ìròyìn

When a box of mass 45kg, is given an initial speed of 5ms-1 it slides along a horizontal floor a distance of 3m before coming to a rest. what is the coefficient of kinetic friction between the box and the floor? (G = 10ms-2)

5

6

5

12

1

3

2

3

Work, Energy & Power

Wo Idahun

Ibeere 4 Ìròyìn

Which of the following properties makes metals ideal for cooking utensils?

high coefficient of expansion

good conduction of heat

low specific heat capacity

poor radiation of heat

Heat Transfer

Wo Idahun

Ibeere 5 Ìròyìn

Two objects, one having three times the mass of the other, are dropped at the same time from a tall building. When they are above the ground, the two objects will have the same

Momentum

Kinetic energy

Potential energy

Acceleration

Newton’s Laws Of Motion

Work, Energy And Power

Wo Idahun

Ibeere 6 Ìròyìn

Fig 1 is a graph of force against extension for a spiral spring, the force constant of the spring is given by the

slope of the linear prtion of the graph

length of the linear portion of the graph

area under the linear portion of the graph

area under the entire graph

Elasticity

Wo Idahun

Ibeere 7 Ìròyìn

Which of the following is in a neutral equilibrium?

a heavy weight suspended on a string

a cone resting on its slant edge

a heavy-based table lamp

the beam of a balance in use

Work, Energy & Power

Equilibrium Of Forces

Wo Idahun

Ibeere 8 Ìròyìn

A lens of focal length 12.0cm forms an upright image three times the size of a real object. The distance between the object and the images is

8.0cm

16.0cm

24.0cm

32.0cm

Awọn alaye Idahun

F = 12cm, V = 3u

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

12 = $\frac{u \times 3 u}{u + 3 v}$

u = 16cm, and v = 48cm

therefore, distance between u and v

v = 48 - 16 = 32cm

Ka ìwé ẹ̀kọ́ nípa Electromagnetic Waves: Types Of Radiation In Elect (WAEC)

Electromagnetic Waves: Types Of Radiation In Elect

Wo Idahun

Ibeere 9 Ìròyìn

What is the effect of the increase in the size of the hole of a pin-hole camera on the image? it

gives a blurred image

corrects for chromatic aberration

magnifies the image

brings the image into a sharper focus

Reflection Of Light At Plane And Curved Surfaces

Wo Idahun

Ibeere 10 Ìròyìn

A rectangular tank contains water to a depth of 2m, if the base is 4m x 3m, calculate the force on the base (Density of water = 103kgm-3, g = 10ms-2)

1.4 x 102N

24 x 104N

2.0 x 104N

1.7 x 103N

Wo Idahun

Ibeere 11 Ìròyìn

A uniform meter rule QR is balanced on a knife edge which is 55cm from R, when a mass of 10g is hung at P as shown above, the mass of the meter rule is (Note that QP is 10cm)

550g

350g

70g

35g

Wo Idahun

Ibeere 12 Ìròyìn

Which of the following represents the correct precision if the length of a piece of wire is measured with a meter rule?

35mm

35.0mm

35.00mm

35.01mm

Measurements And Units

Wo Idahun

Ibeere 13 Ìròyìn

A constant force of magnitude F acts on an object of mass 0.04kg initially at rest at a point O. if the speed of the object when it has moved 50m from O is 500ms-1, what is the value of F?

0.4N

100.0N

250.0N

1000.0N

Awọn alaye Idahun

F = ma and V2 = U2 + 2aX

F = m $\frac{(V^{2} - U^{2})}{2 X}$

= 0.04 $\frac{(500^{2} - 0^{2})}{2 \times 50}$

F = 100N

Ka ìwé ẹ̀kọ́ nípa Current Electricity (JAMB)

Current Electricity

Wo Idahun

Ibeere 14 Ìròyìn

A dentist obtains a linear magnification of 4 of a hole in a tooth by placing a concave mirror at a distance, of 2.0cm from the tooth. The radius of Curvature of the mirror is

5.3cm

3.2cm

2.7cm

1.6cm

Awọn alaye Idahun

v = 4u, if u = 2cm, v = 8cm

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

= $\frac{2 \times 8}{2 + 8}$

= 1.6cm

r = 2F

= 2 x 1.6

= 3.2cm

Ka ìwé ẹ̀kọ́ nípa Measurements And Units (JAMB)

Measurements And Units

Wo Idahun

Ibeere 15 Ìròyìn

In fig 9 the value of R is

3Ω

4Ω

5Ω

6Ω

Scalars And Vectors

Equilibrium Of Forces

Wo Idahun

Ibeere 16 Ìròyìn

Mercury is suitable as a barometric fluid because it

expands uniformly

is opaque

is several times denser than water

is a good conductor of heat

Pressure

Wo Idahun

Ibeere 17 Ìròyìn

A man clapping his hands at regular intervals observes that the echo of a clap coincides with the next clap. If the reflecting cliff is 160m away and the speed of sound is 320ms-1, what is the frequency of the clapping?

1 Hz

2Hz

4Hz

8Hz

Awọn alaye Idahun

Total distance = 2 x 160 = 320cm

Total time = $\frac{320}{320}$ = 1s

F = $\frac{1}{1}$ = $\frac{1}{1}$

= 1Hz

Ka ìwé ẹ̀kọ́ nípa Current Electricity (JAMB)

Current Electricity

Wo Idahun

Ibeere 18 Ìròyìn

Which of the following assumptions is made in a simple pendulum experiment? the

suspending string is inextensible

bob has a finite size

bob has a definite mass

initial angle of oscillation must be large

Scalars And Vectors

Equilibrium Of Forces

Wo Idahun

Ibeere 19 Ìròyìn

Which of the following is true of magnetism?

Iron fillings cling mainly round the ends of a bar magnet

The freely suspended bar magnet comes to rest in the geographic north-south direction

Like poles attract

Iodestone is a non-magnetic oxide

Magnets And Magnetic Fields

Wo Idahun

Ibeere 20 Ìròyìn

The mode of heat transfer which does not require a material medium is

conduction

radiation

convection

propagation

Heat Transfer

Conduction Of Electricity Through

Wo Idahun

Ibeere 21 Ìròyìn

Which of the following is common to evaporation and boiling? They

take place at any temperature

are surface phenomena

involve change of state

take place at a definite pressure

Change Of State

Wo Idahun

Ibeere 22 Ìròyìn

If the inclination at Ibadan is 7oS, this means that

the angle between the geographic meridian and the magnetic meridian at Ibadan is 7o

the earth's magnetic intensity at Ibadan makes angle 7o with the horizontal direction

a magnetic needle will be inclined at 7o to the vertical at Ibadan

the north pole of a magnetic needle dips downward at Ibadan

Electric Field

Wo Idahun

Ibeere 23 Ìròyìn

A pencil is placed vertically between a concave mirror and its focal point. The image of the pencil in the mirror will be

real, inverted and diminished

virtual, inverted and enlarged

real, erect and enlarged

virtual, erect and enlarged

Electrostatics

Wo Idahun

Ibeere 24 Ìròyìn

If the refractive index of glass is 1.5, what is the critical angle at the air-glass interface?

sin-1

\frac{1}{2}

sin-1

\frac{1}{2}

sin-1

\frac{3}{4}

sin-1

\frac{8}{9}

Awọn alaye Idahun

sin ic $\frac{1}{n}$ = $\frac{1}{1 - 5}$

i = sin-1 $\frac{1}{1 - 5}$

= sin-1 $\frac{10}{15}$

= sin-1 $\frac{2}{3}$

Ka ìwé ẹ̀kọ́ nípa Reflection Of Light At Plane And Curved Surfaces (JAMB)

Ka ìwé ẹ̀kọ́ nípa Refraction Of Light Through At Plane And Curved (JAMB)

Reflection Of Light At Plane And Curved Surfaces

Refraction Of Light Through At Plane And Curved

Wo Idahun

Ibeere 25 Ìròyìn

A wave of frequency 10Hz forms a stationary wave pattern in a medium where the velocity is 20cms-1. The distance between adjacent nodes is

1.0cm

1.5cm

2.0cm

5.0cm

Awọn alaye Idahun

$λ$ = $\frac{v}{f}$

= $\frac{20}{10}$

= 2cm ; distance between adjacent nodes

Wo Idahun

Ibeere 26 Ìròyìn

In fig 3, three forces F1, F2, and F3 acting at O are in equilibrium. If the magnitude of F1 is 10N,and the magnitude of F2 is 5N, find the magnitude of F3

26.4N

15.0N

13.2N

10.0N

Equilibrium Of Forces

Wo Idahun

Ibeere 27 Ìròyìn

Which of the following is true of the loudness of sound? It

depends on the square of the amplitude of the vibrating body

is proportional to the distance of the observer from the source of the sound

is greatest in vacuum

is dependent in vacuum

Description Property Of Fields

Wo Idahun

Ibeere 28 Ìròyìn

In which of the following arrangements is the wavelength in an increasing order?

Gamma rays, infra-red rays, x-rays, radiowaves

Gamma rays, x-rays, infra-red ray, radiowaves

Radiowaves, x-rays, gamma ray, infra-red rays

Infra-red rays, radiowaves, x-rays, gamma rays

Electromagnetic Waves: Types Of Radiation In Elect

Wave-particle Paradox

Structure Of The Nucleus

Types Of Waves

Wo Idahun

Ibeere 29 Ìròyìn

When two objects P and Q are supplied with the same quantity of heat, the temperature change in P is observed to be twice that of Q. The ratio of the specific heat capacity of P to Q is

1 : 4

4 : 1

1 : 1

2 : 1

Awọn alaye Idahun

$θ$ p = 2 $θ$ q

mq = 2mp

Cp X mp X $θ$ p = Cq x mq x $θ$ q

$\frac{C_{p} m_{q} θ q}{C_{q} m_{p} θ q}$ = $\frac{θ q \times 2 m p}{2 θ q m p}$

$\frac{C_{p}}{C q}$ = $\frac{2}{2}$

Ka ìwé ẹ̀kọ́ nípa Quantity Of Heat (JAMB)

Quantity Of Heat

Wo Idahun

Ibeere 30 Ìròyìn

Fig 4 represents a block-and-tackle pulley system on which an effort of W newtons supports a load of 120.0N if the efficiency of the system is 40% then the value of W is

28.0N

48.0N

50.0N

288.0N

Simple Machines

Wo Idahun

Ibeere 31 Ìròyìn

A gas occupies a volume of 300cm3at a temperature of 27oC. What is its volume at 54oC, when the pressure is constant?

150cm3

273cm3

327cm3

600cm3

Awọn alaye Idahun

$\frac{V_{1}}{T_{1}}$ = $\frac{V_{2}}{T_{2}}$

$\frac{300}{27 + 273}$ = $\frac{V_{2}}{54 + 273}$

V2 = 327cm3

Ka ìwé ẹ̀kọ́ nípa Quantity Of Heat (JAMB)

Quantity Of Heat

Wo Idahun

Ibeere 32 Ìròyìn

Which of the following is true of sounds?

sound travels faster in air at 20oC than at 30oC

the frequency of a given sound wave changes when it crosses the boundary seperating two media

the wavelength of a given sound wave in air decreases as the temperature increases

sound waves cannot be reflected

Current Electricity

Wo Idahun

Ibeere 33 Ìròyìn

A 1000kg elevator is descending vertically with an acceleration of 1.0ms-2, if the acceleration due to gravity is 10ms-2, the tension in the suspending cable is

1.0N

10.0N

9000.0N

11 000N

Motion

Position, Distance And Displacement

Equilibrium Of Forces

Wo Idahun

Ibeere 34 Ìròyìn

If the fig above E is an accumulator with negligible internal resistance. and the EMF 9.0V, The the total current is

0.3A

0.8A

1.0A

1.8A

Current Electricity

Electric Cells

Wo Idahun

Ibeere 35 Ìròyìn

The sign of the change on a charged glass rod may be determined with

a charged electroscope

an uncharged electroscope

a galvanometer

an electrometer

Wo Idahun

Ibeere 36 Ìròyìn

In fig 6, a ray of light in air strikes a glass plate at an angle of incidence 60 degrees, the reflected ray is observed to be perpendicular to the refracted ray, what is the refractive index of the glass

1.73

1.50

0.87

0.57