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Showing 6901–6950 of 10710 questions
Instruction
JAMB Physics 2010
JAMB (UTME)
Physics
2010
Q6901.Heat is radiated by all hot objects in the form of
Alight energy
Bsolar energy
Cinfrared ray
Dx-rays.
Correct Answer: C
All hot objects emit thermal radiation, which is primarily in the infrared region of the electromagnetic spectrum.
JAMB (UTME)
Physics
2010
Q6902.If a container is filled with ice to the brim, what happens to the level of water when the ice completely melts?
AThe water in the glass outflows.
BThe level of water drops.
CThe level of water remains unchanged
DThe level of water goes up.
Correct Answer: C
Ice floats on water and displaces its own mass of water. When it melts, it turns into exactly that mass of water, so the level remains the same.
JAMB (UTME)
Physics
2010
Q6903.The small droplet of water that forms on the grass in the early hours of the morning is
Adew
Bmist
Cfog
Dhail.
Correct Answer: A
Dew is water in the form of droplets that appears on thin, exposed objects in the morning or evening due to condensation.
JAMB (UTME)
Physics
2010
Q6904.A vapour is said to be saturated when
Aa dynamic equilibrium exists such that more molecules return to the liquid than are leaving it.
Bthe vapour pressure is atmospheric
Cthe temperature of the vapour varies
Da dynamic equilibrium exists between liquid molecules and the vapour molecules.
Correct Answer: D
Saturated vapour is in dynamic equilibrium with its liquid, meaning the rate of evaporation equals the rate of condensation.
JAMB (UTME)
Physics
2010
Q6905.The pressure of one mole of an ideal gas of volume $10^{-2} \mathrm{m}^3$ at a temperature of $27^{\circ}\mathrm{C}$ is .... [Molar gas constant $= 8.3 \mathrm{Jmol}^{-1}\mathrm{K}^{-1}$]
Q6908.The sound of an electric bell dies down slowly when air is slowly pumped out from a bottle because
Asound cannot pass through the bottle
Bsound can pass through a vacuum
Csound needs a material medium
Dthe wavelength of sound becomes greater in the bottle.
Correct Answer: C
Sound is a mechanical wave and requires a material medium (like air) to propagate. As air is removed, the sound fades.
JAMB (UTME)
Physics
2010
Q6909.During a thunderstorm, the sound is heard over a long time. This phenomenon is referred to as
Arefraction of sound
Breverberation
Csuperposition
Ddiffraction of sound.
Correct Answer: B
Reverberation is the persistence of sound after the source has stopped, often due to multiple reflections (echoes) in the atmosphere.
JAMB (UTME)
Physics
2010
Q6910.The velocity of sound in air at $16^{\circ}\mathrm{C}$ is $340 \mathrm{ms}^{-1}$. What will it be when the pressure is doubled and its temperature raised to $127^{\circ}\mathrm{C}$?
A$4,000 \mathrm{ms}^{-1}$
B$160,000 \mathrm{ms}^{-1}$
C$8,000 \mathrm{ms}^{-1}$
D$400 \mathrm{ms}^{-1}$
Correct Answer: D
Velocity of sound depends on temperature, not pressure. $v \propto \sqrt{T}$. $\dfrac{v_2}{v_1} = \sqrt{\dfrac{T_2}{T_1}}$. $v_2 = 340 \times \sqrt{\dfrac{400}{289}} = 340 \times \dfrac{20}{17} = 400 \mathrm{ms}^{-1}$.
JAMB (UTME)
Physics
2010
Q6911.In comparing the camera and the human eye, the film of the camera functions as the
Airis
Bpupil
Ccornea
Dretina
Correct Answer: D
The film in a camera captures the image, just as the retina in the human eye receives the image.
JAMB (UTME)
Physics
2010
Q6912.An object $4 \mathrm{cm}$ high is placed $15 \mathrm{cm}$ from a concave mirror of focal length $5 \mathrm{cm}$. The size of the image is
Q6913.An object is embedded in a block of ice, $10 \mathrm{cm}$ below the plane surface. If the refractive index of the ice is $1.50$, the apparent depth of the object below the surface is
Q6914.Which of the following is used for the correction of short-sightedness?
AConcave lens.
BConcave mirror.
CConvex mirror.
DConvex lens.
Correct Answer: A
Short-sightedness (myopia) is corrected using a diverging (concave) lens.
JAMB (UTME)
Physics
2010
Q6915.Dispersion occurs when white light passes through a glass prism because of the
Adifferent speeds of the colours in the glass.
Bhigh density of the glass.
Cdefects in the glass.
Ddifferent hidden colours in the glass.
Correct Answer: A
Dispersion occurs because different colours of light travel at different speeds in a medium like glass, causing them to refract by different amounts.
JAMB (UTME)
Physics
2010
Q6916.When a positively charged rod is brought nearer the cap of a positively charged electroscope, the leaves divergence will
Aconverge
Bremain constant
Cdiverge
Dbe induced.
Correct Answer: C
Like charges repel. The positive rod repels positive charges onto the leaves, increasing their divergence.
JAMB (UTME)
Physics
2010
Q6917.Three capacitors of capacitance, $2\mu\mathrm{F}$, $4\mu\mathrm{F}$ and $8\mu\mathrm{F}$ are connected in parallel and a p.d of $6\mathrm{V}$ is maintained across each capacitor, the total energy stored is
Q6918.A cell of emf $12\mathrm{V}$ and internal resistance $4\Omega$ is connected to an external resistor of resistance $2\Omega$. Find the current flow.
Q6919.The diagram above shows a balanced metre bridge, the value of $x$ is
A$66.7 \mathrm{cm}$
B$25.0 \mathrm{cm}$
C$33.3 \mathrm{cm}$
D$75.0 \mathrm{cm}$
Correct Answer: C
At balance, $\dfrac{R_1}{R_2} = \dfrac{x}{100 - x}$. The left side has two $8\Omega$ resistors in parallel, so $R_1 = 4\Omega$. The right side has one $8\Omega$ resistor. $\dfrac{4}{8} = \dfrac{x}{100 - x}$. $\dfrac{1}{2} = \dfrac{x}{100 - x}$. $100 - x = 2x$. $3x = 100$. $x = 33.3 \mathrm{cm}$.
JAMB (UTME)
Physics
2010
Q6920.Three $4\Omega$ resistors connected in parallel have a potential difference of $16\mathrm{V}$ applied across them. What is the total current in the circuit?
A$12 \mathrm{A}$
B$8 \mathrm{A}$
C$10 \mathrm{A}$
D$14 \mathrm{A}$
Correct Answer: A
For resistors in parallel, $\dfrac{1}{R} = \dfrac{1}{4} + \dfrac{1}{4} + \dfrac{1}{4} = \dfrac{3}{4}$, so $R = \dfrac{4}{3} \Omega$. $I = \dfrac{V}{R} = \dfrac{16}{4/3} = 16 \times \dfrac{3}{4} = 12 \mathrm{A}$.
JAMB (UTME)
Physics
2010
Q6921.In the diagram above, a $200 \mathrm{W}$ bulb is lighted by a $240 \mathrm{V}$ a.c mains supply. If $1\mathrm{kWh}$ is sold at ₦40, the cost of keeping the bulb lighted for a day is
Q6922.Power supply is transmitted at a very high voltage and low current in order to
Aincrease the power supply
Bprevent overheating of the coil
Cmake it travel fast
Dmake it pass through the transformers.
Correct Answer: B
High voltage and low current reduce power loss $I^2R$ in transmission cables, preventing overheating.
JAMB (UTME)
Physics
2010
Q6923.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
2010
Q6924.A galvanometer with full-scale deflection of $10\mathrm{mA}$ is to be converted to a voltmeter with full-scale deflection of $5 \mathrm{V}$. If a series resistance of $498\Omega$ is used for the conversion, the resistance of the galvanometer is
Q6925.Two inductors of inductances $5 \mathrm{mH}$ and $15 \mathrm{mH}$ are connected in series and a current of $5\mathrm{A}$ flows through them. The total energy stored in the inductors is
A$250.0\mathrm{J}$
B$50.0\mathrm{J}$
C$62.5\mathrm{J}$
D$500.0\mathrm{J}$
Correct Answer: A
Total inductance $L = 5 + 15 = 20 \mathrm{mH} = 0.02 \mathrm{H}$. Energy $= \dfrac{1}{2}LI^2 = \dfrac{1}{2} \times 0.02 \times 5^2 = \dfrac{1}{2} \times 0.02 \times 25 = 0.25 \mathrm{J}$. The answer key is incorrect; the correct answer should be $0.25 \mathrm{J}$, which is not listed. (The answer key provided A, which corresponds to $250 \mathrm{mJ}$).
JAMB (UTME)
Physics
2010
Q6926.In alternating current circuit at resonance, the angle of lead or lag is
A$\dfrac{\pi^2}{2}$
B$0^{\circ}$
C$\dfrac{\pi^2}{3}$
D$\pi^{\circ}$
Correct Answer: B
At resonance, the inductive reactance equals the capacitive reactance, so the circuit is purely resistive. The voltage and current are in phase, so the phase angle is $0^{\circ}$.
JAMB (UTME)
Physics
2010
Q6927.In Faraday's law of electrolysis, a graph of mass deposited against the quantity of electricity is plotted. The slope of the graph gives
Athe electrochemical equivalent
Bthe charge released
Cthe current flowing
Dthe energy released
Correct Answer: A
According to Faraday's first law, $m = ZQ$. A graph of $m$ against $Q$ has a slope equal to $Z$, the electrochemical equivalent.
JAMB (UTME)
Physics
2010
Q6928.In a discharge tube, most of the gas is pumped out so that electricity is conducted at
Asteady voltage
Bhigh pressure
Chigh pressure
Dlow voltage.
Correct Answer: C
(Note: The options B and C are identical in the source text. The correct principle is that electricity is conducted at low pressure. Assuming a typo, the intended answer is low pressure, but as written, the answer key points to C). The correct answer should be 'low pressure'.
JAMB (UTME)
Physics
2010
Q6929.The radioisotope $^{235}_{92}\mathrm{U}$ decays by emitting two alpha particles, three beta particles and a gamma ray. What is the mass and atomic numbers of the resulting daughter element?
A$91$ and $227$
B$92$ and $238$
C$227$ and $91$
D$215$ and $88$.
Correct Answer: C
Mass number: $235 - (2 \times 4) = 227$. Atomic number: $92 - (2 \times 2) + (3 \times 1) = 92 - 4 + 3 = 91$. So the answer is $227$ and $91$.
JAMB (UTME)
Physics
2010
Q6930.The ground state energy for a hydrogen atom is $5.44 \times 10^{-19} \mathrm{J}$. If an electron drops from zero to ground state, calculate the frequency of the emitted radiation $\left[h = 6.6 \times 10^{-34} \mathrm{Js}\right]$
A$2.0 \times 10^{16} \mathrm{Hz}$
B$2.0 \times 10^{15} \mathrm{Hz}$
C$5.0 \times 10^{15} \mathrm{Hz}$
D$5.0 \times 10^{16} \mathrm{Hz}$
Correct Answer: D
$E = hf$. $f = \dfrac{E}{h} = \dfrac{5.44 \times 10^{-19}}{6.6 \times 10^{-34}} = 0.824 \times 10^{15} = 8.24 \times 10^{14} \mathrm{Hz}$. The provided options are incorrect. The closest option is D, but the calculation yields a different value.
JAMB (UTME)
Physics
2010
Q6931.Transistors are used for the
Aconversion of a.c. to d.c.
Bconversion of d.c. to a.c.
Camplification of signals
Drectification of signals.
Correct Answer: C
Transistors are primarily used for amplification and switching in electronic circuits.
JAMB (UTME)
Physics
2010
Q6932.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 in common-emitter configuration shows collector current $I_c$ increasing with collector-emitter voltage $V_{ce}$ and then flattening out. Graph C represents this.
JAMB (UTME)
Physics
2010
Q6933.Which of the following is a pure semiconductor?
ASilicon
BPhosphorus
CTransistor
DCarbon
Correct Answer: A
Silicon is a pure elemental semiconductor. Phosphorus is a dopant, and a transistor is a device made of semiconductors.
Instruction
JAMB Physics 2011
JAMB (UTME)
Physics
2011
Q6934.Which Question Paper Type of Physics is given to you?
AType A
BType B
CType C
DType D
Correct Answer: C
The answer is C based on the provided answer key.
JAMB (UTME)
Physics
2011
Q6935.A carpenter on top of a roof $20 \mathrm{m}$ high dropped a hammer of mass $1.5 \mathrm{kg}$ and it fell freely to the ground. The kinetic energy of the hammer just before hitting the ground is ....... $[g = 10 \mathrm{ms}^{-2}]$
Q6936.Two balls X and Y weighing $5 \mathrm{g}$ and $50 \mathrm{kg}$ respectively were thrown up vertically at the same time with a velocity of $100 \mathrm{ms}^{-1}$. How will their positions be one second later?
AX and Y will both be $500 \mathrm{m}$ from the point of throw
BX and Y will be $500 \mathrm{m}$ from each other
CY will be $500 \mathrm{m}$ ahead of X
DX will be $500 \mathrm{m}$ ahead of Y.
Correct Answer: B
Both are projectiles under gravity, so their positions depend only on initial velocity and time, not mass. At $t = 1 \mathrm{s}$, both are at the same height. They are at the same position, so the distance between them is $0$. The answer key B is incorrect; the correct answer should be that they are at the same position.
JAMB (UTME)
Physics
2011
Q6937.A man standing on a lift that is descending does not feel any weight because
Athere is no gravitational pull on the man in the lift
Bthe inside of the lift is air tight
Cthe lift is in vacuum
Dthere is no reaction from the floor of the lift.
Correct Answer: D
Weight is felt due to the normal reaction from the floor. If the lift descends freely, the normal reaction becomes zero (apparent weightlessness).
JAMB (UTME)
Physics
2011
Q6938.The diagram above shows two vectors at right angles to each other. The value of the resultant vector is
Q6939.An object of mass $2 \mathrm{kg}$ moves with a velocity of $10 \mathrm{ms}^{-1}$ round a circle of radius $4 \mathrm{m}$. Calculate the centripetal force on the object.
Q6940.If it takes an object $3 \mathrm{s}$ to fall freely to the ground from a certain height, what is the distance covered by the object? $[g = 10 \mathrm{ms}^{-2}]$
Q6941.The diagrams above show the positions of a cone. The position which can be described as neutral equilibrium is represented as
AY and X
BZ only
CX only
DY and Z.
Correct Answer: B
A cone resting on its side (Z) is in neutral equilibrium. When displaced, its centre of gravity remains at the same height.
JAMB (UTME)
Physics
2011
Q6942.If a tube of small radius opened at both ends is placed in a liquid, the liquid will
Arise above the liquid level if the liquid does not wet the glass
Bremain at the same level irrespective of whether the liquid wets the glass or not
Cfall below the liquid level if the liquid wets the glass
Dfall below the liquid level if the liquid does not wet the glass.
Correct Answer: D
Capillary depression occurs when the liquid does not wet the glass (e.g., mercury in glass), causing the liquid level to fall below the outside level.
JAMB (UTME)
Physics
2011
Q6943.I. Density of the liquid
AI and III only
BI and II only
CII and III only
DI, II and III.
Correct Answer: B
Pressure in a liquid depends on depth ($h$), density ($\rho$), and gravity ($g$): $P = \rho g h$. It does not depend on surface area.
JAMB (UTME)
Physics
2011
Q6944.I. High thermal capacity
AII, III and IV
BI and II
CI, II, III and IV
DI, III and IV.
Correct Answer: A
A good thermometer needs high sensitivity, easy readability, and accuracy over a wide range. High thermal capacity is not a desirable quality as it would make it slow to respond.
JAMB (UTME)
Physics
2011
Q6945.A machine is used to lift a load of $20 \mathrm{N}$ through a height of $10 \mathrm{m}$. If the efficiency of the machine is $40\%$, how much work is done?
Q6946.Which of the following could be effectively used to reduce friction?
APetrol
BKerosene
CGrease
DWater.
Correct Answer: D
(Note: The provided answer key says D, but grease is the best lubricant for reducing friction. Water is a poor lubricant compared to grease. However, following the key, the answer is D). Grease is the most effective among the options.
JAMB (UTME)
Physics
2011
Q6947.A copper wire was subjected to a tensile stress of $7.7 \times 10^{7} \mathrm{Nm}^{-2}$. Calculate the tensile strain of the wire. $[\text{Young modulus} = 1.1 \times 10^{11} \mathrm{Nm}^{-2}]$
Q6948.An object weighs $22 \mathrm{kg}$ in water and $30 \mathrm{kg}$ in air. What is the up thrust exerted by the liquid on the object? $[g = 10 \mathrm{ms}^{-2}]$
A$80 \mathrm{N}$
B$50 \mathrm{N}$
C$520 \mathrm{N}$
D$220 \mathrm{N}$.
Correct Answer: A
Upthrust = Weight in air - Weight in water = $(30 - 22) \times 10 = 8 \times 10 = 80 \mathrm{N}$.
JAMB (UTME)
Physics
2011
Q6949.A block of aluminium is heated electrically by a $30 \mathrm{W}$ heater. If the temperature rises by $100^{\circ}\mathrm{C}$ in $5$ minutes, the heat capacity of the aluminium is
A$200 \mathrm{JK}^{-1}$
B$900 \mathrm{JK}^{-1}$
C$90 \mathrm{JK}^{-1}$
D$100 \mathrm{JK}^{-1}$
Correct Answer: B
Heat supplied $= Pt = 30 \times 5 \times 60 = 9000 \mathrm{J}$. Heat capacity $C = \dfrac{Q}{\Delta T} = \dfrac{9000}{100} = 90 \mathrm{JK}^{-1}$. The answer key is incorrect; the correct answer is C.
JAMB (UTME)
Physics
2011
Q6950.A perfect emitter or absorber of radiant energy is a
Ared body
Bconductor
Cblack body
Dwhite body.
Correct Answer: C
A black body is a perfect emitter and absorber of radiation.