JAMB UTME - Physics - 1993 | Green Bridge CBT

Ibeere 1 Ìròyìn

Which of the following waves can propagate through a vacuum?

High velocity sound waves

Ultrasonic waves

Acoustic waves

Infra-red waves

Electromagnetic Waves: Types Of Radiation In Electromagnetic Spectrum

Wo Idahun

Ibeere 2 Ìròyìn

In the figure above,A lever of length 200m is used to lift a load of mass 180kg. The pivot at P is 20m from the load. what minimum force F must be applied at the end of the lever [g = 10ms-2]

9N

18N

20N

200N

Measurements And Units

Wo Idahun

Ibeere 3 Ìròyìn

The terminal voltage of a battery is 4.0V when supplying a current of 2.0A, and 2.0V when supplying a current of 3.0A. The internal resistance of the battery is

0.5

Ω

1.0

Ω

2.0

Ω

4.0

Ω

Current Electricity

Wo Idahun

Ibeere 4 Ìròyìn

Natural radioactivity is the random spontaneous disintegration of the nuclei of heavy isotopes of certain elements with the emission of

α

, X, and

β

α

,

β

and

γ

-rays

X,

α

,

γ

-ray

α

,

β

and X-rays

Electromagnetic Waves: Types Of Radiation In Electromagnetic Spectrum

Electric Field

Refraction Of Light Through Plane And Curved Surfaces

Wo Idahun

Ibeere 5 Ìròyìn

An object of mass 400g and density 600kgm-3 is suspended with a sting so that half of it is immersed in paraffin of density 900kgm-3. The tension in the string is

1.0N

3.0N

4.0N

5.0N

Awọn alaye Idahun

volume of object =

\frac{400 \times 10^{- 2}}{600}

= 0.00067m3

volume of paraffin displaced = $\frac{1}{2}$ x 0.00067

= 0.00034m3

mass of paraffin = 900 x 34 x 10-5

= 0.3kg

weight of paraffin = 0.3 x 10

= 3N = upthrust = tension in the string

Ka ìwé ẹ̀kọ́ nípa Measurements And Units (JAMB)

Measurements And Units

Wo Idahun

Ibeere 6 Ìròyìn

Which of the following statements correctly describe(s) cathode rays? i. they consist of tiny particles carrying negative electric charges. ii. they are deflected in a magnetic field but not in an electric field. iii. they consist of fast moving neutrons and deflected in an electric field.

i only

ii only

i and ii only

ii and iii only

Structure Of The Atom (Nigeria Only)

Electrostatics

Wo Idahun

Ibeere 7 Ìròyìn

An element X of an atomic number 88 and mass number 226 decays to form an element Z by emitting two beta particles and an alpha particle. Z is represented by

22282Z

22288Z

22686Z

_{80}^{226} Z

Structure Of The Atom (Nigeria Only)

Wo Idahun

Ibeere 8 Ìròyìn

200g of water at 90oC is mixed with 100g of water at 30oC. What is the final temperature?

50oC

60oC

70oC

80oC

Awọn alaye Idahun

Heat lost = heat gained

200 x c x (90 - $θ$ )

$θ$ = 70oC

Ka ìwé ẹ̀kọ́ nípa Temperature And Its Measurement (JAMB)

Temperature And Its Measurement

Wo Idahun

Ibeere 9 Ìròyìn

The kinetic theory of photoelectron liberated from a metallic surface depends on the

intensity of the incident radiation

time duration of the incident radiation

temperature of the incident radiation

frequency of the incident radiation

Electromagnetic Field (Part 2)

Thermal Expansion

Wo Idahun

Ibeere 10 Ìròyìn

Which of the following may be used to explain a mirage? i. layers of air near the road surface have varying refractive indices in hot weather. ii. road surfaces sometimes become good reflectors in hot weathers. iii. light from the sky can be reflected upwards after coming close to the road surface.

ii only

ii and iii only

i and iii only

i, ii, and iii only

Refraction Of Light Through Plane And Curved Surfaces

Properties Of Waves: Reflection, Refraction, Diffraction

Wo Idahun

Ibeere 11 Ìròyìn

The thermometric properties of the thermocouple is that is

e.m.f. changes with temperature

resistance changes with temperature

volume changes with temperature

pressure changes with resistance

Electrostatics

Wo Idahun

Ibeere 12 Ìròyìn

Two mirrors M1 and M2 are inclined at right angles as shown above calculate the angle of reflection of the ray of light at M2

30∘

45∘

60∘

90∘

Electrostatics

Wo Idahun

Ibeere 13 Ìròyìn

Which of the following expressions gives the linear magnification produced by a concave mirror of radius of curvature r, if U and V are the object and image distances respectively?

\frac{V}{r}

- 1

\frac{2 V}{r}

- 1

\frac{U}{r}

- 1

\frac{2 U}{r}

- 1

Temperature And Its Measurement

Gravitational Field

Wo Idahun

Ibeere 14 Ìròyìn

If the focal length of a camera lens is 20cm, the distance from the film at which the lens must be set to produce a sharp image of an object 100cm away is

17cm

20cm

25cm

100cm

Structure Of The Nucleus

Wo Idahun

Ibeere 15 Ìròyìn

Radio waves emitted from an antenna are picked up by a radar after reflection from an aircraft in 4 x 10-3S. How far is the aircraft from the antenna? [c = 3 x 108ms-1 ]

6.0 x 102ms-1

1.2 x 103km

3.0 x 103km

6.0 x 10 5km

Electromagnetic Waves: Types Of Radiation In Electromagnetic Spectrum

Wo Idahun

Ibeere 16 Ìròyìn

The external and internal diameter of a tube are measured as (32 ± 2)mm and (21 ± 1)mm respectively. Determine the percentage error in the thickness of the tube.

27%

14%

9%

3%

Awọn alaye Idahun

Actual thickness = 34 - 22 = 12

error thickness = 30 - 20 = 10

error = 12 - 10 = 2mm that is, (11 ± 1)mm

%error = $\frac{1}{11}$ x $\frac{100}{1}$

= 9%

Ka ìwé ẹ̀kọ́ nípa Measurements And Units (JAMB)

Measurements And Units

Wo Idahun

Ibeere 17 Ìròyìn

The current I in the fig above is

4.00A

1.30A

0.80A

0.75A

Current Electricity

Simple A.C Circuits

Wo Idahun

Ibeere 18 Ìròyìn

When the volume of a given mass of gas is halved and its temperature doubled, the pressure

remains constant

increases by a factor of 4

increases by a factor of 3

decreases by a factor of 4

Gas Laws

Wo Idahun

Ibeere 19 Ìròyìn

Which of the following devices may be used to step up the voltage in a d.c. circuit?

a step-up transformer

a d.c. generator

a wattmeter

an induction coil

Electric Field

Electromagnetic Field (Part 2)

Wo Idahun

Ibeere 20 Ìròyìn

A beam of light is incident from air to water at an angle of $30^\circ\text{C}$. Find the angle of refraction if the refractive index of water is $\frac{4}{3}$

15oC

18oC

22oC

24oC

Awọn alaye Idahun

\frac{4}{3}

=

\frac{s i n 30}{s i n r}

r = 22oC

Wo Idahun

Ibeere 21 Ìròyìn

Determine the inductive reactance when a 30.0mH inductor with a negligible resistance is connected to a 1.3 x 103Hz oscillator.

39.0

Ω

122.5

Ω

245.0

Ω

39000.0

Ω

Wo Idahun

Ibeere 22 Ìròyìn

In the network shown above, determine the potential difference across the 5µF capacitor

3V

6V

12V

18V

Wo Idahun

Ibeere 23 Ìròyìn

Which of the following correctly explains why soft iron is proffered to steel in electromagnets? i. soft iron is more readily magnetized than steel. ii. soft iron is more readily demagnetized than steel. iii. soft iron retains magnetism more than steel.

i only

ii and iii only

i and ii only

i, ii, and iii.

Electric Field

Wo Idahun

Ibeere 24 Ìròyìn

Two forces of magnitudes 7N and 3N act at right angles to each other. The angle $ \theta $ between the resultant and the 7N force is given by

cos

θ

=

\frac{3}{7}

sin

θ

=

\frac{3}{7}

tan

θ

=

\frac{3}{7}

cot

θ

=

\frac{3}{7}

Awọn alaye Idahun

θ

= tan-1

\frac{3}{7}

Wo Idahun

Ibeere 25 Ìròyìn

Which of the following are produced after a nuclear fusion process? i. one heavy nucleus. ii. neutrons-1. iii. protons. iv. Energy.

i and ii

i and iv

ii and iii

ii and iv

Magnetic Field (Part 2)

Wo Idahun

Ibeere 26 Ìròyìn

The primary aim in high tension transmission is to

minimize electrical energy losses due to heat production

increase the rate of energy transfer by using high voltage

increase the current in the wire

generate electricity at high current and low voltage

Electric Cells

Wo Idahun

Ibeere 27 Ìròyìn

The force experienced by an object of mass 60.0kg in the moon's gravitational field is 1.002 x 102N. What is the intensity of the gravitational field?

0.60Nkg-1

1.67Nkg-1

6.12 x 102Nkg-1

9.81ms-2

Gravitational Field

Wo Idahun

Ibeere 28 Ìròyìn

Which of the following quantities has the same unit as the watt?

Force x time

Force x distance

Force x acceleration

Force x velocity

Wo Idahun

Ibeere 29 Ìròyìn

The diagram above shows a velocity time graph representing the motion of a car. Find the total distance covered during the acceleration and retardation of the motion

75m

150m

300m

375m

Motion

Wo Idahun

Ibeere 30 Ìròyìn

A plane inclined at angle $ \theta $ has a velocity ratio of 10 : 1. The inclination of the plane to the horizontal is given by

tan

θ

=

\frac{1}{10}

cot

θ

=

\frac{1}{10}

cos

θ

=

\frac{1}{10}

sin

θ

=

\frac{1}{10}

Awọn alaye Idahun

V.R =

\frac{1}{s i n θ}

= 10

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

Ka ìwé ẹ̀kọ́ nípa Scalars And Vectors (JAMB)

Scalars And Vectors

Wo Idahun

Ibeere 31 Ìròyìn

A rocket burns fuel at the rate of 10kgs-1 and ejects it with velocity of 5 x 103ms-1. The thrust exerted by the gas on the rock is

2.5 x 107N

5.0 x 104N

5.0 x 102N

2.0 x 10-3N

Friction

Wo Idahun

Ibeere 32 Ìròyìn

The property of the eye known as its power of accommodation is controlled by the

pupil

virteous humour

iris

ciliary muscles

Structure Of The Atom (Nigeria Only)

Wo Idahun

Ibeere 33 Ìròyìn

A metal rod 800mm long is heated from 10oC to 95oC. If it expands by 1.36mm, the linear expansivity of the metal is

2.0 x 102K-1

6.0 x 102K-1

5.0 x 10-3K-1

2.0 x 10-5K-1

Temperature And Its Measurement

Wo Idahun

Ibeere 34 Ìròyìn

Determine the distance between the consecutive antinodes XX if the wavelength is 66cm

15cm

30cm

60cm

120cm

Awọn alaye Idahun

Distance XX =

\frac{1}{2}

λ

= $\frac{1}{2}$ x $\frac{60}{1}$

= 30cm

Ka ìwé ẹ̀kọ́ nípa Propagation Of Sound Waves (JAMB)

Propagation Of Sound Waves

Wo Idahun

Ibeere 35 Ìròyìn

A current of 100mA passes through a conductor for 2 minutes. The quantity of electricity transported is

200C

50C

12C

0.002C

Current Electricity

Heat Energy

Light Waves

Wo Idahun

Ibeere 36 Ìròyìn

A current carrying conductor experiences a force when placed in a magnetic field because the

conductor is magnetized

magnetic field of the current interacts with external magnetic field

force is due to the motor principle

electric field of the current interacts with the external magnetic field

Force On A Current-Carrying Conductor In A Magnetic Field

Wo Idahun

Ibeere 37 Ìròyìn

A 40-W instrument has a resistance of $90\ \Omega$. On what voltage should it be operated normally?

60V

150V

225V

3600V

Current Electricity

Wo Idahun

Ibeere 38 Ìròyìn

A weightless vessel of dimensions 4m x 3m x 2m is filled with a liquid of density 1000kgm-3 and sealed. What is the maximum pressure this container can exert on a flat surface? [g = 10ms-2]

9 x 104NM-2

4 x 104NM-2

3 x 104NM-2

2 x 104NM-2

Pressure

Wo Idahun

Ibeere 39 Ìròyìn

A simple cell with mercury-amalgamated zinc electrode prevents

local actions

polarization

buckling

degradation

Electric Cells

Electrostatics

Wo Idahun

Ibeere 40 Ìròyìn

A parallel plate capacitor of area $10\text{cm}^2$ in vacuum has a capacitance of $10^{-2}\,\mu\text{F}$. What is the distance between the plates? $(e = 9 x 10^{-12}\text{fm})$

9 x 10-13m

9 x 10-7m

9 x 10-3m

9 x 107m

Awọn alaye Idahun

C =

\frac{ε_{o} A}{d}

10-2 x 10-6 = $\frac{9 \times 10^{- 12}}{d}$ x 10-4

= 9 x 10-7m

Ka ìwé ẹ̀kọ́ nípa Capacitors (JAMB)

Capacitors

Wo Idahun

Ibeere 41 Ìròyìn

Which of the following correctly explain(s) why a green leaf appears green in bright day light? i. it absorbs only the green component of sunlight. ii. it absorbs all colour of sunlight except green. iii. it reflects only the green component of sunlight.

i only

ii only

i and iii only

ii and iii only