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Showing 7301–7350 of 10710 questions
Instruction
JAMB Physics 2016
JAMB (UTME)
Physics
2016
Q7301.I. Moon II. Sun III. Street light IV. Stars
AI, II and IV only
BI, II and III only
CIII and IV only
DII and IV only
Correct Answer: D
The sun and stars are natural sources of light. The moon reflects light and is not a source.
JAMB (UTME)
Physics
2016
Q7302.An object placed at the bottom of a well full of clear water appears closer to the surface due to
Arefraction
Breflection
Can inverter
Da magnifier
Correct Answer: A
Refraction causes the apparent depth to be less than the real depth.
JAMB (UTME)
Physics
2016
Q7303.A boy drags a bag of rice along a smooth horizontal floor with a force of 2N applied at an angle of 60 degrees to the floor. The work done after a distance of 3m is
A6 J
B4 J
C5 J
D3 J
Correct Answer: D
Work = F d cos theta = 2 x 3 x cos 60 = 6 x 0.5 = 3 J.
JAMB (UTME)
Physics
2016
Q7304.The spheres of masses 5.0 kg and 10.0 kg are 0.3 m apart. Calculate the force of attraction between them.
A3.57 x 10^-8 N
B3.71 x 10^-8 N
C4.00 x 10^-8 N
D2.50 x 10^-8 N
Correct Answer: B
F = G m1 m2 / r^2 = (6.67 x 10^-11 x 5 x 10) / (0.3)^2 = (3.335 x 10^-9) / 0.09 = 3.71 x 10^-8 N.
JAMB (UTME)
Physics
2016
Q7305.When very hot water is poured into two identical thin and thick glass tumblers in equal volumes, the thick one cracks because
Aof the even expansion of glass
Bglass is a good conductor of heat
Cglass is a crystal
Dof the uneven expansion of glass
Correct Answer: D
Thick glass has poor heat conductivity, causing uneven expansion and cracking.
JAMB (UTME)
Physics
2016
Q7306.The diagram above represents the stress-strain for a typical metal rod. What does X represent?
AYield point
BBreaking point
CElastic limit
DProportional limit
Correct Answer: A
X represents the yield point where the material begins to deform plastically.
JAMB (UTME)
Physics
2016
Q7307.Transverse waves can be distinguished from longitudinal waves using the characteristic of
Adiffraction
Breflection
Cpolarization
Drefraction
Correct Answer: C
Polarization is a property of transverse waves only.
JAMB (UTME)
Physics
2016
Q7308.Which of the following pairs of light rays shows the widest separation in the spectrum of white light?
AGreen and yellow
BBlue and red
CIndigo and violet
DOrange and red
Correct Answer: B
Red and violet (or blue) are at the extremes of the visible spectrum.
JAMB (UTME)
Physics
2016
Q7309.Which of the following graphs shows the correct vector diagram for the circuit above?
A[Graph A]
B[Graph B]
C[Graph C]
D[Graph D]
Correct Answer: A
The correct vector diagram for an R-L circuit shows voltage across resistor (V_R) in phase with current, and voltage across inductor (V_L) leading current by 90 degrees.
JAMB (UTME)
Physics
2016
Q7310.A transistor functions mainly as
Aswitch and an amplifier
Brectifier and an amplifier
Ccharge storer and a switch
Dcharge storer and an amplifier
Correct Answer: A
Transistors are used as switches and amplifiers.
JAMB (UTME)
Physics
2016
Q7311.A thin wire with heavy weights attached to both ends is hung over a block of ice resting on two supports. If the wire cuts through the ice block while the block remains solid behind the wire, the process is called
Afusion
Bsublimation
Cregulation
Dcondensation
Correct Answer: C
Regulation is the process where ice melts under pressure and refreezes when pressure is removed.
JAMB (UTME)
Physics
2016
Q7312.The inner diameter of a small test tube can be measured accurately using a
Amicrometer screw gauge
Bpair of Vernier callipers
Cmetre rule
Dpair of dividers
Correct Answer: B
Vernier callipers can measure internal dimensions accurately.
JAMB (UTME)
Physics
2016
Q7313.A platinum resistance thermometer records 3.0 W at 0 degrees C and 8.0 W at 100 degrees C. If it records 6.0 W in a certain environment, the temperature of the medium is
A60 degrees C
B80 degrees C
C50 degrees C
D30 degrees C
Correct Answer: A
Using linear interpolation: (6 - 3) / (8 - 3) = (T - 0) / (100 - 0). 3/5 = T/100. T = 60 degrees C.
JAMB (UTME)
Physics
2016
Q7314.In the diagram above, which of the angles theta1, theta2, theta3 and theta4 is the angle of deviation of a ray of light passing through XYZ?
Atheta2
Btheta1
Ctheta3
Dtheta4
Correct Answer: A
The angle of deviation is the angle between the incident ray and the emergent ray, which is theta2.
JAMB (UTME)
Physics
2016
Q7315.Which of the following is the dimension of pressure?
Q7316.A capacitor 8 microF is charged to a potential difference of 100V. The energy stored by the capacitor is
A1.0 x 10^4 J
B4.0 x 10^-2 J
C1.25 x 10 J
D8.0 x 10 J
Correct Answer: B
E = 1/2 C V^2 = 1/2 x 8 x 10^-6 x 100^2 = 4 x 10^-2 J.
JAMB (UTME)
Physics
2016
Q7317.Which of the following statements correctly describe(s) cathode rays?
AI only
BIII only
CI and II only
DII and III only
Correct Answer: A
Cathode rays are streams of electrons (negative particles) and are deflected by both electric and magnetic fields. Only statement I is correct.
JAMB (UTME)
Physics
2016
Q7318.A concave mirror has a radius of curvature of 36cm. At what distance from the mirror should an object be placed to give a real image three times the size of the object?
A12 cm
B24 cm
C48 cm
D108 cm
Correct Answer: B
f = R/2 = 18 cm. m = v/u = 3, so v = 3u. 1/f = 1/u + 1/v. 1/18 = 1/u + 1/3u = 4/3u. 3u = 72. u = 24 cm.
JAMB (UTME)
Physics
2016
Q7319.The net capacitance in the circuit shown above is
A8.0 microF
B6.0 microF
C2.0 microF
D4.0 microF
Correct Answer: C
The circuit has two 2 microF capacitors in parallel (giving 4 microF) and one 4 microF capacitor in series. The series combination gives (4 x 4)/(4 + 4) = 2 microF.
JAMB (UTME)
Physics
2016
Q7320.A sonometer wire of length 100cm under a tension of 10N has a frequency of 250Hz. Keeping the length of the wire constant, the tension is adjusted to produce a new frequency of 350Hz. The new tension is
A5.1 N
B19.6 N
C14.0 N
D7.1 N
Correct Answer: B
f is proportional to sqrt(T). (f2/f1)^2 = T2/T1. (350/250)^2 = T2/10. (1.4)^2 = T2/10. 1.96 = T2/10. T2 = 19.6 N.
JAMB (UTME)
Physics
2016
Q7321.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
2016
Q7322.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
2016
Q7323.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
2016
Q7324.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
2016
Q7325.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
2016
Q7326.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
2016
Q7327.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
2016
Q7328.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
2016
Q7329.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
2016
Q7330.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
2016
Q7331.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
2016
Q7332.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
2016
Q7333.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
Q7334.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
Q7335.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
Q7336.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
Q7337.Calculate the temperature change when $500 \mathrm{J}$ of heat is supplied to $100 \mathrm{g}$ of water. [Specific heat capacity of water $= 4200 \mathrm{Jkg}^{-1}\mathrm{K}^{-1}$]
Q7338.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
Q7339.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
Q7340.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
Q7341.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
Q7342.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. $[g \approx 10 \mathrm{ms}^{-2}]$
Q7343.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
Q7344.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? $[c = 3.0 \times 10^8 \mathrm{ms}^{-1}]$
Q7345.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
Q7346.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
Q7347.$^{235}_{92}\mathrm{U} + ^{1}_{0}n \rightarrow ^{144}_{56}\mathrm{Ba} + ^{90}_{36}\mathrm{Kr} + 2X$. 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
Q7348.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
Q7349.The refractive index of the medium M in the diagram above is