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Showing 7251–7300 of 10710 questions
Instruction
JAMB Physics 2017
JAMB (UTME)
Physics
2017
Q7251.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
Q7252.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
Q7253.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
Q7254.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
Q7255.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
Q7256.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
Q7257.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
Q7258.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
Q7259.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
Q7260.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
Q7261.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
Q7262.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
Q7263.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
Q7264.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
Q7265.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
Q7266.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
Q7268.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
Q7269.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
Q7270.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
Q7271.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
Q7272.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
Q7273.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
Q7274.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
Q7275.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
Q7276.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 $100^{\circ}\mathrm{C}$?
Q7277.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
Q7278.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
Q7279.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?
Q7280.In the diagram below, which of the simple pendula will resonate with P when set into oscillation?
AU
BT
CR and T
DQ and R
Correct Answer: B
Resonance occurs when the lengths of the pendula are equal. Pendulum T has the same length as P.
JAMB (UTME)
Physics
2018
Q7281.The time rate of loss of heat by a body is proportional to the
Atemperature of its surroundings
Btemperature of the body
Cdifference in temperature between the body and its surroundings
Dratio of the temperature of the body to that of its surroundings
Correct Answer: C
According to Newton's law of cooling, the rate of heat loss is proportional to the temperature difference between the body and its surroundings.
JAMB (UTME)
Physics
2018
Q7282.A positively charged rod X is brought near an uncharged metal sphere Y and is then touched by a finger with X still in place. When the finger is removed, the result is that Y has
Ano charge and a zero potential
Ba positive charge and a zero potential
Ca negative charge and a positive potential
Da negative charge and a negative potential
Correct Answer: D
This is charging by induction. The sphere acquires a negative charge and a negative potential.
JAMB (UTME)
Physics
2018
Q7283.Electrical appliances in homes are normally earthed so that
Aa person touching the appliances is safe from electric shock
Bboth the a.c. and d.c. sources can be used
Cthe appliances are maintained at a higher p.d. than the earth
Dthe appliances are maintained at a lower p.d. than the earth
Correct Answer: A
Earthing provides a safe path for current to flow to the ground in case of a fault, preventing electric shock.
JAMB (UTME)
Physics
2018
Q7284.The process whereby a liquid turns spontaneously into vapour is called
Aregulation
Bevaporation
Cboiling
Dsublimation
Correct Answer: B
Evaporation is the spontaneous change of a liquid into vapour at any temperature.
JAMB (UTME)
Physics
2018
Q7285.Which of the following diagrams represents correctly an n-p-n transistor?
A[Diagram A]
B[Diagram B]
C[Diagram C]
D[Diagram D]
Correct Answer: D
The correct symbol for an n-p-n transistor shows the arrow on the emitter pointing outwards (away from the base).
JAMB (UTME)
Physics
2018
Q7286.The differences observed in solids, liquids and gases may be accounted for by
Atheir relative masses
Btheir melting points
Cthe spacing and forces acting between the molecules
Dthe different molecules in each of them
Correct Answer: C
The differences in properties arise from the spacing and intermolecular forces between molecules.
JAMB (UTME)
Physics
2018
Q7287.Convex mirrors are used as driving mirrors because images formed are
Aerect, diminished and virtual
Berect, magnified and real
Cinverted, diminished and virtual
Dinverted, magnified and real
Correct Answer: A
Convex mirrors form erect, diminished, and virtual images, giving a wide field of view.
JAMB (UTME)
Physics
2018
Q7288.Musical instruments playing the same note can be distinguished from one another owing to the differences in their
Aquality
Bpitch
Cintensity
Dloudness
Correct Answer: A
Quality (timbre) distinguishes different instruments playing the same note.
JAMB (UTME)
Physics
2018
Q7289.In the diagram above, if the south-poles of two magnets stroke a steel bar, the polarities at T and V will respectively be
Anorth and south
Bsouth and south
Cnorth and north
Dsouth and north
Correct Answer: C
The end of the bar stroked by the S-pole becomes a N-pole. Since both magnets are stroked from the centre outwards, T and V both become N-poles.
JAMB (UTME)
Physics
2018
Q7290.In homes, electrical appliances and lamps are connected in parallel because
Aless current will be used
Bless voltage will be used
Cparallel connection does not heat up the wires
Dseries connection uses high voltage
Correct Answer: C
(Note: The main reason is that each appliance gets the full voltage and can be operated independently. The answer key C is a weak explanation). The correct reason is that each appliance receives the full supply voltage.
JAMB (UTME)
Physics
2018
Q7291.An object moves in a circular path of radius $0.5 \mathrm{m}$ with a speed of $1 \mathrm{ms}^{-1}$. What is its angular velocity?
Q7293.Calculate the effective capacitance of the circuit above.
A$4 \mu\mathrm{F}$
B$3 \mu\mathrm{F}$
C$2 \mu\mathrm{F}$
D$1 \mu\mathrm{F}$
Correct Answer: D
The circuit has two $2 \mu\mathrm{F}$ capacitors in parallel (giving $4 \mu\mathrm{F}$) and one $4 \mu\mathrm{F}$ capacitor in series. The series combination gives $\dfrac{4 \times 4}{4 + 4} = 2 \mu\mathrm{F}$. Then two $2 \mu\mathrm{F}$ capacitors in parallel give $4 \mu\mathrm{F}$, and finally two $4 \mu\mathrm{F}$ in series give $2 \mu\mathrm{F}$. The answer key D is incorrect; the correct answer is $2 \mu\mathrm{F}$ (Option C).
Instruction
JAMB Physics 2016
JAMB (UTME)
Physics
2016
Q7294.The focal length of a concave mirror is 2.0 cm. If an object is placed 8.0 cm from it, the image is at
Electrical energy is measured in kilowatt-hours (kWh).
JAMB (UTME)
Physics
2016
Q7296.The resultant of two forces is 50N. If the forces are perpendicular to each other and one of them makes an angle of 30 degrees with the resultant. Find its magnitude.
A100.0 N
B57.7 N
C25.0 N
D43.3 N
Correct Answer: D
F1 = R cos theta = 50 x cos 30 = 50 x 0.866 = 43.3 N.
JAMB (UTME)
Physics
2016
Q7297.A piece of radioactive material contains 1000 atoms. If its half-life is 20 seconds, the time taken for 125 atoms to remain is
A20 seconds
B40 seconds
C60 seconds
D80 seconds
Correct Answer: C
N = N0 (1/2)^n. 125 = 1000 (1/2)^n. (1/2)^n = 1/8 = (1/2)^3. n = 3. t = 3 x 20 = 60 s.
JAMB (UTME)
Physics
2016
Q7298.The correct expression for the potential at a point, distance r from a charge q, in an electric field is
Aq / (4 pi epsilon0 r)
Bq^2 / (4 pi epsilon0 r^2)
Cq / (4 pi epsilon0 r^2)
Dq^2 / (4 pi epsilon0 r)
Correct Answer: A
Electric potential V = q / (4 pi epsilon0 r).
JAMB (UTME)
Physics
2016
Q7299.A typical transistor characteristic is represented as
A[Graph A]
B[Graph B]
C[Graph C]
D[Graph D]
Correct Answer: C
The characteristic curve for a transistor shows collector current increasing with collector-emitter voltage and then flattening out. Graph C represents this.
JAMB (UTME)
Physics
2016
Q7300.In a discharge tube, most of the gas is pumped out so that electricity is conducted at
Asteady voltage
Bhigh pressure
Clow pressure
Dlow voltage
Correct Answer: C
Gases conduct electricity at low pressure and high potential difference.