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Instruction
JAMB Physics 2017
JAMB (UTME)
Physics
2017
Q7351.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
Q7352.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
Q7353.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
Q7354.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
Q7355.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
Q7356.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
Q7357.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
Q7358.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
Q7359.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
Q7360.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
Q7361.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
Q7362.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
Q7363.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
Q7366.Mercury is suitable as a barometric fluid because it
Aexpands uniformly
Bis several times denser than water
Cis opaque
Dis a good conductor of heat
Correct Answer: B
Mercury is used in barometers because its high density allows a reasonable column height.
JAMB (UTME)
Physics
2017
Q7367.Which of the following features is NOT a characteristic of natural radioactivity?
Aradioactivity is a nuclear phenomenon
Bradioactivity is exhibited only by the element of mass number greater than 206
CThe radioactivity of an element is affected by electric and magnetic fields in the surroundings
DRadioactive substances emit three types of radiations: alpha-rays, beta-rays and gamma-rays
Correct Answer: C
Radioactivity is a nuclear property and is not affected by external electric or magnetic fields.
JAMB (UTME)
Physics
2017
Q7368.Which of the following is a correct explanation of the INERTIA of a body?
AReluctance to start moving at rest and its reluctance to stop moving once it has begun to move
BReluctance to stop moving
CReadiness to start moving
DReluctance to start moving and its readiness to stop moving once it has begun to move
Correct Answer: A
Inertia is the reluctance of a body to change its state of rest or uniform motion.
JAMB (UTME)
Physics
2017
Q7369.If the force on a charge of $0.2 \mathrm{C}$ in an electric field intensity of $4 \mathrm{N/C}$, the force is
A$0.8 \mathrm{N}$
B$20.0 \mathrm{N}$
C$0.8 \mathrm{N/C}$
D$4.2 \mathrm{N/C}$
Correct Answer: A
$F = qE = 0.2 \times 4 = 0.8 \mathrm{N}$.
JAMB (UTME)
Physics
2017
Q7370.The point beyond which a stretched spring does not return to its original length is called the
Abreaking point
Bspring constant
Celastic limit
Delasticity point
Correct Answer: C
The elastic limit is the point beyond which a material will not return to its original shape when the deforming force is removed.
JAMB (UTME)
Physics
2017
Q7371.Which of the following statements is applicable to a real image formed by a concave mirror?
AI, II and III only
BI, II and IV only
CI and III only
DI and II only
Correct Answer: B
A real image can be caught on a screen, is inverted, and is formed by actual convergence of rays. It does not "only seem to exist" (that describes a virtual image).
JAMB (UTME)
Physics
2017
Q7372.Which of the following does not cause a reduction of the surface tension of water?
Asoap solution
Bdetergent
Calcohol
Dgrease
Correct Answer: D
Soap, detergent, and alcohol reduce surface tension. Grease (oil) does not reduce surface tension; it increases it or has little effect.
JAMB (UTME)
Physics
2017
Q7373.In what range of temperature is the expansion of water anomalous?
A$0^{\circ}\mathrm{C}$ to $4^{\circ}\mathrm{C}$
B$4^{\circ}\mathrm{C}$ to $100^{\circ}\mathrm{C}$
C$0^{\circ}\mathrm{C}$ to $100^{\circ}\mathrm{C}$
D$-4^{\circ}\mathrm{C}$ to $0^{\circ}\mathrm{C}$
Correct Answer: A
Water shows anomalous expansion between $0^{\circ}\mathrm{C}$ and $4^{\circ}\mathrm{C}$, where it contracts as temperature increases.
Instruction
JAMB Physics 2018
JAMB (UTME)
Physics
2018
Q7374.A man walks 1 km due east and then 1 km due north. His displacement is
A$\sqrt{2} \mathrm{km}$ N $45^{\circ}$ E
B$1 \mathrm{km}$ N $30^{\circ}$ E
C$1 \mathrm{km}$ N $15^{\circ}$ E
D$\sqrt{2} \mathrm{km}$ N $60^{\circ}$ E
Correct Answer: A
The man walks east then north, so the resultant displacement is $\sqrt{1^2 + 1^2} = \sqrt{2} \mathrm{km}$ in the direction N $45^{\circ}$ E.
JAMB (UTME)
Physics
2018
Q7375.The density of $400 \mathrm{cm}^3$ of palm oil was $0.9 \mathrm{g/cm}^3$ before frying. If the density of the oil was $0.6 \mathrm{g/cm}^3$ after frying, assuming no loss of oil to spilling, its new volume was
A$360 \mathrm{cm}^3$
B$600 \mathrm{cm}^3$
C$240 \mathrm{cm}^3$
D$800 \mathrm{cm}^3$
Correct Answer: B
Mass $= \rho V = 0.9 \times 400 = 360 \mathrm{g}$. After frying, $V = \dfrac{m}{\rho} = \dfrac{360}{0.6} = 600 \mathrm{cm}^3$.
JAMB (UTME)
Physics
2018
Q7376.Which of the following is true of an electrical charge?
APositive charge means deficit electrons
BNegative charge means excess of electrons
CElectric current means movement of electrons
DAll of the above
Correct Answer: D
All three statements are correct. Positive charge = deficit of electrons, negative charge = excess of electrons, and electric current is the movement of electrons.
JAMB (UTME)
Physics
2018
Q7377.Natural radioactivity consists of the emission of
Aalpha-particles and beta-rays
Balpha-particles and X-rays
Calpha-particles, beta-rays and gamma-rays
Dgamma-rays and X-rays
Correct Answer: C
Natural radioactivity involves the emission of alpha particles, beta particles, and gamma rays.
JAMB (UTME)
Physics
2018
Q7378.Which of the following does NOT describe the image formed by a plane mirror?
AErect
BLaterally inverted
CSame distance from mirror as object
DMagnified
Correct Answer: D
A plane mirror forms an image that is the same size as the object, not magnified.
JAMB (UTME)
Physics
2018
Q7379.What is the resultant resistance of the circuit given above?
A$8 \Omega$
B$11 \Omega$
C$4 \Omega$
D$3.6 \Omega$
Correct Answer: A
The $2 \Omega$ and $2 \Omega$ resistors are in parallel, giving $1 \Omega$. Then $3 \Omega$, $1 \Omega$, and $4 \Omega$ are in series: $3 + 1 + 4 = 8 \Omega$.
JAMB (UTME)
Physics
2018
Q7380.Which of the following best describes the energy changes which take place when a steam engine drives a generator which lights a lamp?
Steam engine: heat to kinetic. Generator: kinetic to electrical. Lamp: electrical to heat and light.
JAMB (UTME)
Physics
2018
Q7381.Cathode rays are
AHigh-energy electromagnetic waves
Bprotons
Cneutrons
Dstreams of electrons
Correct Answer: D
Cathode rays are streams of electrons.
JAMB (UTME)
Physics
2018
Q7382.A narrow beam of white light can be split into different colours by a glass prism. The correct explanation is that
Awhite light is an electromagnetic wave
Bthe prism has all the colours of the white light
Cdifferent colours of white light travel with different speeds in glass
Dwhite light has undergone total internal reflection in the prism.
Correct Answer: C
Dispersion occurs because different colours travel at different speeds in glass.
JAMB (UTME)
Physics
2018
Q7383.Figure 2 represents a block-and-tackle pulley system on which an effort of W Newtons supports a load of 120.0 N. If the efficiency of the machine is 40%, then the value of W is
A$28.0 \mathrm{N}$
B$48.0 \mathrm{N}$
C$288.0 \mathrm{N}$
D$50.0 \mathrm{N}$
Correct Answer: D
From the diagram, the velocity ratio is 6 (6 rope segments). Efficiency $= \dfrac{MA}{VR}$. $0.4 = \dfrac{120/W}{6}$. $2.4 = \dfrac{120}{W}$. $W = 50 \mathrm{N}$.
JAMB (UTME)
Physics
2018
Q7384.What type of reaction is represented by the following scheme? $^2_1X + ^2_1Y \rightarrow ^3_2Z + ^1_0n + \text{energy}$
AFusion reaction
BFission reaction
CChain reaction
DRadioactive decay
Correct Answer: A
Two light nuclei combine to form a heavier nucleus, releasing energy. This is nuclear fusion.
JAMB (UTME)
Physics
2018
Q7385.The amount of heat needed to raise the temperature of $10 \mathrm{kg}$ of copper by $1 \mathrm{K}$ is its
Aspecific heat capacity
Blatent heat
Cheat capacity
Dinternal energy
Correct Answer: C
Heat capacity is the heat required to raise the temperature of a body by $1 \mathrm{K}$.
JAMB (UTME)
Physics
2018
Q7386.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
Shadows and eclipses are formed because light travels in straight lines.
JAMB (UTME)
Physics
2018
Q7388.Which of the following obeys Ohm's Law?
AAll metals
BDiode only
CAll electrolytes
DGlass
Correct Answer: A
Metals obey Ohm's law at constant temperature.
JAMB (UTME)
Physics
2018
Q7389.Which of the following statements are TRUE of ISOTOPES?
AI and II only
BI and III only
CII and III only
DI, II and III
Correct Answer: D
All three statements are true of isotopes.
JAMB (UTME)
Physics
2018
Q7390.In the diagram above, the hanging mass $m_2$ is adjusted until $m_1$ is on the verge of sliding. The coefficient of static friction between mass $m_1$ and the table is
A$\dfrac{m_1}{m_2}$
B$\dfrac{m_1 g}{m_2}$
C$\dfrac{m_2}{m_1}$
D$\dfrac{m_2 g}{m_1}$
Correct Answer: C
At the verge of sliding, friction force equals the hanging weight: $\mu m_1 g = m_2 g$. $\mu = \dfrac{m_2}{m_1}$.
JAMB (UTME)
Physics
2018
Q7391.Which of the following may be used to explain a mirage?
AI and III only
BII and III only
CII only
DI, II and III
Correct Answer: D
All three statements explain the phenomenon of mirage.
JAMB (UTME)
Physics
2018
Q7392.In the diagram below, if the atmospheric pressure is $760 \mathrm{mmHg}$, the pressure in the chamber G is
A$660 \mathrm{mmHg}$
B$830 \mathrm{mmHg}$
C$690 \mathrm{mmHg}$
D$860 \mathrm{mmHg}$
Correct Answer: B
The pressure in G is greater than atmospheric by the height of the mercury column. $P_G = 760 + 70 = 830 \mathrm{mmHg}$.
JAMB (UTME)
Physics
2018
Q7393.Which of the following has the lowest internal resistance when new?
ALeclanche cell
BDaniel cell
CTorch battery
DAccumulator
Correct Answer: D
An accumulator (lead-acid battery) has the lowest internal resistance.
JAMB (UTME)
Physics
2018
Q7394.The pitch of an acoustic device can be increased by
Adecreasing the loudness
Bincreasing the amplitude
Cincreasing the frequency
Ddecreasing the intensity
Correct Answer: C
Pitch is determined by frequency. Increasing frequency increases pitch.
JAMB (UTME)
Physics
2018
Q7395.One of the features of the fission process is that
Ait leads to chain reaction
Bits products are not radioactive
Cneutrons are not released
Dthe sum of the masses of the reactants equals the sum of the masses of the products
Correct Answer: A
Nuclear fission can lead to a chain reaction.
JAMB (UTME)
Physics
2018
Q7396.The linear expansivity of brass is $2 \times 10^{-5} \mathrm{K}^{-1}$. If the volume of a piece of brass is $15.00 \mathrm{cm}^3$ at $0^{\circ}\mathrm{C}$, what is the volume at $100^{\circ}\mathrm{C}$?
Q7397.A lead bullet of mass $0.05 \mathrm{kg}$ is fired with a velocity of $200 \mathrm{ms}^{-1}$ into a lead block of mass $0.95 \mathrm{kg}$. Given that the lead block can move freely, the final kinetic energy after impact is
Q7398.In a series R-L-C circuit at resonance, the voltages across the resistor and the inductor are $20 \mathrm{V}$ and $40 \mathrm{V}$ respectively. What is the voltage across the capacitor?
A$30 \mathrm{V}$
B$70 \mathrm{V}$
C$50 \mathrm{V}$
D$40 \mathrm{V}$
Correct Answer: D
At resonance, the voltage across the inductor equals the voltage across the capacitor. So $V_C = V_L = 40 \mathrm{V}$.
JAMB (UTME)
Physics
2018
Q7399.If the fraction of the atoms of a radioactive material left after 120 years is $\dfrac{1}{64}$, what is the half-life of the material?