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Showing 7201–7250 of 10710 questions
Instruction
JAMB Physics 2016
JAMB (UTME)
Physics
2015
Q7201.In a sound wave in air, the adjacent rarefactions and compressions are separated by a distance of 17cm. If the velocity of the sound wave is 340 m/s, determine the frequency.
A10 Hz
B20 Hz
C5780 Hz
D1000 Hz
Correct Answer: D
The distance between adjacent compression and rarefaction is half a wavelength. lambda/2 = 17 cm, so lambda = 34 cm = 0.34 m. f = v/lambda = 340/0.34 = 1000 Hz.
JAMB (UTME)
Physics
2015
Q7202.A note is called an octave of another note when
Athe notes have the same fundamental frequency
Bits frequency is half of the first note
Cits frequency is twice that of the first note
Dits periodic time is twice that of the first note
Correct Answer: C
An octave has twice the frequency of the original note.
JAMB (UTME)
Physics
2015
Q7203.A metallic strip of iron and brass was heated. Which of the following diagrams accurately illustrated the shape of the strip after heating?
A[Diagram A]
B[Diagram B]
C[Diagram C]
D[Diagram D]
Correct Answer: A
Brass has a higher linear expansivity than iron, so the bimetallic strip bends with brass on the outer (longer) curve.
JAMB (UTME)
Physics
2015
Q7204.Which of the following is in a neutral equilibrium?
AA ball on a flat surface
BA cone on its apex
CA cone on its base
DA ball in a bowl
Correct Answer: A
A ball on a flat surface is in neutral equilibrium - when displaced, its centre of gravity remains at the same height.
JAMB (UTME)
Physics
2015
Q7205.A convex mirror is used as a driving mirror because
AI and III only
BI and II only
CII and III only
DI, II and III only
Correct Answer: B
Convex mirrors give erect images and have a wide field of view.
JAMB (UTME)
Physics
2015
Q7206.What is the cost of running five 50W lamps and four 100W lamps for 10 hours if electrical energy costs 2 kobo per kWh?
A0.13
B0.65
C3.90
D39.00
Correct Answer: A
Total power = (5 x 50) + (4 x 100) = 250 + 400 = 650 W = 0.65 kW. Energy = 0.65 x 10 = 6.5 kWh. Cost = 6.5 x 2 = 13 kobo = 0.13 naira.
JAMB (UTME)
Physics
2015
Q7207.The specific latent heat of vaporization of a substance is always
Aless than its specific latent heat of fusion
Bequal to its specific latent heat of fusion
Cgreater than its specific latent heat of fusion
Dall of the above depending on the nature of the substance
Correct Answer: C
Latent heat of vaporization is always greater than latent heat of fusion.
JAMB (UTME)
Physics
2015
Q7208.A hydrometer is an instrument for measuring the
Adepth of water in a vessel
Brelative humidity of the air
Crelative density of a liquid by finding the apparent loss in weight
Drelative density of a liquid by the method of flotation
Correct Answer: D
A hydrometer measures relative density by flotation.
JAMB (UTME)
Physics
2015
Q7209.A transformer has 300 turns of wire in the primary coil and 30 turns in the secondary coil. If the input voltage is 240V, the output voltage is
A10 volts
B5 volts
C15 volts
D24 volts
Correct Answer: D
Vs/Vp = Ns/Np. Vs = 240 x (30/300) = 240 x 0.1 = 24 V.
JAMB (UTME)
Physics
2015
Q7210.The activity of a radioactive substance depends on
Atemperature and purity
Bpurity and age
Ctemperature and age
Dage, purity and temperature
Correct Answer: D
Radioactive decay is a nuclear process and is not affected by external factors. The answer key D is incorrect; activity depends only on the number of undecayed nuclei.
JAMB (UTME)
Physics
2015
Q7211.The speed of light in air is 3 x 10^8 m/s. If the refractive index of light from air to water is 4/3, then which of the following is the correct value of the speed of light in water?
A4 x 10^8 m/s
B2.23 x 10^8 m/s
C2.25 x 10^8 m/s
D4/9 x 10^8 m/s
Correct Answer: B
v = c/n = (3 x 10^8) / (4/3) = 3 x 10^8 x 3/4 = 2.25 x 10^8 m/s. The answer key B is incorrect; the correct answer is C.
JAMB (UTME)
Physics
2015
Q7212.A magnet is moved through a coil of wire. The e.m.f. produced in the wire depends on
Athe number of turns in the coil
Bthe strength of magnet
Cthe speed at which the magnet is moved
Dall of the above
Correct Answer: D
The induced e.m.f. depends on the number of turns, the strength of the magnet, and the speed of movement.
JAMB (UTME)
Physics
2015
Q7213.A charge of one coulomb liberated 0.0033g of copper in an electrolytic process. How long will it take a current of 2A to liberate 1.98g of copper in such a process?
A30 minutes
B5 minutes
C50 minutes
D60 minutes
Correct Answer: B
m = ZIt. Z = 0.0033 g/C. 1.98 = 0.0033 x 2 x t. t = 1.98 / 0.0066 = 300 s = 5 minutes.
Instruction
JAMB Physics 2017
JAMB (UTME)
Physics
2017
Q7214.What is the least possible error encountered when taking measurement with a meter rule?
A$0.5 \mathrm{mm}$
B$1.0 \mathrm{mm}$
C$0.2 \mathrm{mm}$
D$0.1 \mathrm{mm}$
Correct Answer: A
The least count of a metre rule is $1 \mathrm{mm}$, so the least possible error is half of the least count, which is $0.5 \mathrm{mm}$.
JAMB (UTME)
Physics
2017
Q7215.The electromotive force in the secondary winding is
Astabilizing
Breducing
Cincreasing
Dvarying
Correct Answer: D
In a transformer, the induced e.m.f. in the secondary winding varies with time (a.c.).
JAMB (UTME)
Physics
2017
Q7216.If a pump is capable of lifting $5000 \mathrm{kg}$ of water through a vertical height of $60 \mathrm{m}$ in $15 \mathrm{min}$, the power of the pump is
Q7217.Calculate the temperature change when $500 \mathrm{J}$ of heat is supplied to $100 \mathrm{g}$ of water. [Specific heat capacity of water $= 4200 \mathrm{Jkg}^{-1}\mathrm{K}^{-1}$]
Q7218.Which of the following particles CANNOT be deflected by both electric and magnetic fields?
AGamma rays
BAlpha particles
CWave particles
DBeta particles
Correct Answer: A
Gamma rays are electromagnetic waves with no charge, so they are not deflected by electric or magnetic fields.
JAMB (UTME)
Physics
2017
Q7219.Under which of the following conditions do gasses conduct electricity?
AHigh pressure and low p.d
BLow pressure and high p.d
CLow pressure and low p.d
DHigh pressure and high p.d
Correct Answer: B
Gases conduct electricity at low pressure and high potential difference.
JAMB (UTME)
Physics
2017
Q7220.Dispersion occurs when white light passes through a glass prism because of the
Adefects in the glass
Bhigh density of the glass
Cdifferent speeds of the colours in the glass
Ddifferent hidden colours in the glass
Correct Answer: C
Dispersion occurs because different colours of light travel at different speeds in a medium like glass.
JAMB (UTME)
Physics
2017
Q7221.Calculate the e.m.f of the cell in the above circuit if its internal resistance is negligible.
A$12 \mathrm{V}$
B$36 \mathrm{V}$
C$2 \mathrm{V}$
D$8 \mathrm{V}$
Correct Answer: A
The two resistors ($3\Omega$ and $6\Omega$) are in parallel. $\dfrac{1}{R} = \dfrac{1}{3} + \dfrac{1}{6} = \dfrac{1}{2}$. $R = 2\Omega$. $E = IR = 4 \times 2 = 8 \mathrm{V}$. The answer key A is incorrect; the correct answer is D ($8 \mathrm{V}$).
JAMB (UTME)
Physics
2017
Q7222.An object of mass $80 \mathrm{kg}$ is pulled on a horizontal rough ground by a force of $500 \mathrm{N}$. Find the coefficient of static friction. $[g \approx 10 \mathrm{ms}^{-2}]$
Q7223.The diagram above shows plank RS pivoted at its centre of gravity O and is in equilibrium with the weights P and Q. If a weight 2P is added to P, the plank will be in equilibrium again by
Amoving P nearer to O
Bmoving Q nearer to O
Cadding a weight Q to Q
Dmoving P further away from O
Correct Answer: B
Adding weight to P increases the anticlockwise moment. To restore equilibrium, Q must be moved further from O, or the moment on Q's side must increase. The answer key B is incorrect; moving Q nearer to O would decrease its moment. The correct action is to move Q further from O, or move P nearer to O. The closest correct option is A (moving P nearer to O).
JAMB (UTME)
Physics
2017
Q7224.A glass plate $0.9 \mathrm{cm}$ thick has a refractive index of $1.50$. How long does it take for a pulse of light to pass through the plate? $[c = 3.0 \times 10^8 \mathrm{ms}^{-1}]$
Q7225.The main purpose of the transformer in an a.c radio set is to
Aincrease power to the radio
Bconvert energy from a.c. to d.c
Cstep up the voltage
Dstep down the voltage
Correct Answer: D
A transformer in a radio set steps down the voltage from the mains to a lower voltage suitable for the radio.
JAMB (UTME)
Physics
2017
Q7226.The energy associated with the emitted photon when a mercury atom changes from one state to another is $3.3 \mathrm{eV}$. Calculate the frequency of the photon. $[h = 6.6 \times 10^{-34} \mathrm{Js}, 1 \mathrm{eV} = 1.6 \times 10^{-19} \mathrm{J}]$
A$3.2 \times 10^{-53} \mathrm{Hz}$
B$3.1 \times 10^{-53} \mathrm{Hz}$
C$1.3 \times 10^{-53} \mathrm{Hz}$
D$8.0 \times 10^{-53} \mathrm{Hz}$
Correct Answer: A
$E = hf$. $f = \dfrac{E}{h} = \dfrac{3.3 \times 1.6 \times 10^{-19}}{6.6 \times 10^{-34}} = \dfrac{5.28 \times 10^{-19}}{6.6 \times 10^{-34}} = 8.0 \times 10^{14} \mathrm{Hz}$. The answer key A is incorrect; the correct answer is $8.0 \times 10^{14} \mathrm{Hz}$, which is not listed.
JAMB (UTME)
Physics
2017
Q7227.$^{235}_{92}\mathrm{U} + ^{1}_{0}n \rightarrow ^{144}_{56}\mathrm{Ba} + ^{90}_{36}\mathrm{Kr} + 2X$. In the reaction above, $X$ is
Aelectron
Bneutron
Cneutrino
Dproton
Correct Answer: B
Balancing mass numbers: $235 + 1 = 144 + 90 + 2A$. $236 = 234 + 2A$. $A = 1$. Balancing atomic numbers: $92 + 0 = 56 + 36 + 2Z$. $92 = 92 + 2Z$. $Z = 0$. So X is a neutron.
JAMB (UTME)
Physics
2017
Q7228.To protect a material from the influence of an external magnetic field, the material should be kept in a
Asoft iron ring
Bloop of copper wire
Ctriangular zinc ring
Dsquare steel ring
Correct Answer: A
A soft iron ring provides magnetic shielding by diverting magnetic field lines around the enclosed space.
JAMB (UTME)
Physics
2017
Q7229.The refractive index of the medium M in the diagram above is
Q7230.Thermal equilibrium between two objects exists when
Athe heat capacities of both objects are the same
Bthe quantity of heat in both objects are the same
Cthe temperature of both objects are equal
Done object loses heat continuously to the other
Correct Answer: C
Thermal equilibrium exists when there is no net heat flow between objects, which occurs when their temperatures are equal.
JAMB (UTME)
Physics
2017
Q7231.Which of the following is a characteristic of stationary waves?
AThe antinode is a point of minimum displacement
BThe distance between two successive nodes is one wavelength
CThey can be transverse or longitudinal
DThey are formed by two identical waves travelling in opposite directions
Correct Answer: D
Stationary waves are formed by the superposition of two identical waves travelling in opposite directions.
JAMB (UTME)
Physics
2017
Q7232.The height at which the atmosphere ceases to exist is about $80 \mathrm{km}$. If the atmospheric pressure at a height of $20 \mathrm{km}$ above the ground level is
A$480 \mathrm{mmHg}$
B$570 \mathrm{mmHg}$
C$190 \mathrm{mmHg}$
D$380 \mathrm{mmHg}$
Correct Answer: A
Assuming pressure decreases linearly with height: $P = 760 \times \left(1 - \dfrac{20}{80}\right) = 760 \times 0.75 = 570 \mathrm{mmHg}$. The answer key A is incorrect; the correct answer is B.
JAMB (UTME)
Physics
2017
Q7233.A metal of mass $0.5 \mathrm{kg}$ is heated to $100^{\circ}\mathrm{C}$ and then transferred to a well-lagged calorimeter of heat capacity $80 \mathrm{JK}^{-1}$ containing water of heat capacity $420 \mathrm{JK}^{-1}$ at $20^{\circ}\mathrm{C}$. If the final steady temperature of the mixture is $40^{\circ}\mathrm{C}$, find the specific heat capacity of the metal.
A$92 \mathrm{Jkg}^{-1}\mathrm{K}^{-1}$
B$286 \mathrm{Jkg}^{-1}\mathrm{K}^{-1}$
C$133 \mathrm{Jkg}^{-1}\mathrm{K}^{-1}$
D$887 \mathrm{Jkg}^{-1}\mathrm{K}^{-1}$
Correct Answer: D
Heat lost by metal = Heat gained by calorimeter + water. $0.5 \times c \times (100 - 40) = (80 + 420) \times (40 - 20)$. $30c = 500 \times 20 = 10000$. $c = 333.3 \mathrm{Jkg}^{-1}\mathrm{K}^{-1}$. The answer key D is incorrect; the correct answer is not listed.
JAMB (UTME)
Physics
2017
Q7234.In the series a.c circuit shown below, the p.d across the inductor is $8 \mathrm{V}$ r.m.s and across the resistor is $6 \mathrm{V}$ r.m.s. The effective voltage is
Q7235.In a closed organ pipe producing a musical note, an antinode will always be produced at
Athe closed end
Bthe middle
Cthe open end
Dall the parts of the pipe
Correct Answer: C
In a closed pipe, an antinode is always formed at the open end.
JAMB (UTME)
Physics
2017
Q7236.What happens when a certain quantity of pure ice is completely changed to water at $0^{\circ}\mathrm{C}$?
ALatent heat is absorbed, the mass decreases and the volume increases
BLatent heat is absorbed, the mass remains constant and the volume decreases
CLatent heat is given out, the mass increases and the volume remains constant
DLatent heat is given out, the mass remains constant and the volume decreases
Correct Answer: B
Ice absorbs latent heat of fusion, mass remains constant, and volume decreases (ice is less dense than water).
JAMB (UTME)
Physics
2017
Q7237.In the diagram above, P, Q and R are vectors. Which of the following options gives the correct relationship between the vectors?
A$P = Q + R$
B$P = Q - R$
C$P = R - Q$
D$P + Q + R = 0$
Correct Answer: A
The diagram shows a triangle of vectors. P is the resultant of Q and R, so $P = Q + R$.
JAMB (UTME)
Physics
2017
Q7238.If two parallel conductors carry currents flowing in the same direction, the conductors will
Aattract each other
Brepel each other
Chave no effect on each other
Dbe perpendicular to each other
Correct Answer: A
Parallel currents in the same direction attract each other.
JAMB (UTME)
Physics
2017
Q7239.Which of the following correctly explain(s) why a green leaf appears green in bright daylight?
AI only
BII and III only
CI and II only
DII only
Correct Answer: B
A green leaf reflects green light and absorbs all other colours.
JAMB (UTME)
Physics
2017
Q7240.Which of the following factors has no effect on the e.m.f of a primary cell?
Anature of plate
Bsize of the cell
Ctemperature
Dnature of the electrolyte
Correct Answer: B
The e.m.f. of a primary cell depends on the nature of the electrodes and electrolyte, but not on the size of the cell.
JAMB (UTME)
Physics
2017
Q7241.When the bottom tip of a vibrating tuning fork is held in contact with a wooden box, a louder sound is heard. This phenomenon is known as
Abeats
Bechoing
Creverberation
Dresonance
Correct Answer: D
The wooden box resonates with the tuning fork, amplifying the sound.
JAMB (UTME)
Physics
2017
Q7242.A particle of mass m which is at rest splits up into two. If the mass and the velocity of one of the particles are m and v respectively, calculate the velocity of the second particle.
A$\dfrac{mv}{M}$
B$\dfrac{mv}{M - m}$
C$\dfrac{mv}{M + m}$
D$\dfrac{mv}{M - m}$
Correct Answer: B
By conservation of momentum: $0 = mv + (M - m)v_2$. $v_2 = -\dfrac{mv}{M - m}$. The velocity is $\dfrac{mv}{M - m}$.
JAMB (UTME)
Physics
2017
Q7243.The electrochemical equivalent of silver is $0.0012 \mathrm{g/C}$. If $36.0 \mathrm{g}$ of silver is to be deposited by electrolysis on a surface by passing a steady current for $5.0$ minutes, the current must be