2017 JAMB PHYSICS PAST QUESTIONS AND ANSWERS Leave a Comment / Jamb Physics / By Jamb Tutor Report a question What’s wrong with this question? You cannot submit an empty report. Please add some details. 0% 0 votes, 0 avg Created by Jamb TutorJamb Physics 2017 JAMB PHYSICS PAST QUESTIONS AND ANSWERS 1 / 40 Category: JAMB Physics 2017 1. $$\text{The focal length of a concave mirror is 2.0 cm. If an object is placed 8.0 cm from it, the image is at:}$$ a) $$\text{2.3 m.}$$ b) $$\text{2.5 m.}$$ c) $$\text{2.0 m.}$$ d) $$\text{2.7 m.}$$ $$\text{Using the mirror formula, } \frac{1}{f} = \frac{1}{u} + \frac{1}{v}. \text{ Substituting, the image distance v is 2.5 cm.}$$ 2 / 40 Category: JAMB Physics 2017 2. $$\text{PHCN measures its electrical energy in:}$$ a) $$\text{Wh.}$$ b) $$\text{kWh.}$$ c) `textJ.\text{J.}textJ. d) `textW.\text{W.}textW. $$\text{Electric energy is commonly measured in kilowatt-hours (kWh), where 1 kWh represents the use of 1 kilowatt of power for 1 hour.}$$ 3 / 40 Category: JAMB Physics 2017 3. $$\text{The resultant of two forces is 50N. If the forces are perpendicular to each other and one of them makes an angle } 30^{\circ} \text{ with the resultant, find its magnitude.}$$ a) $$\text{100.0 N.}$$ b) `text57.7N.\text{57.7 N.}text57.7N. c) `text25.0N.\text{25.0 N.}text25.0N. d) `text43.3N.\text{43.3 N.}text43.3N. $$\text{Using trigonometry: } F_1 = F_R \times \cos(\theta). \text{ Here, } F_1 = 50 \times \cos(30^{\circ}) = 43.3 N.}$$ 4 / 40 Category: JAMB Physics 2017 4. $$\text{A piece of radioactive material contains 1000 atoms. If its half-life is 20 seconds, the time taken for 125 atoms to remain is:}$$ a) $$\text{20 seconds.}$$ b) $$\text{40 seconds.}$$ c) $$\text{60 seconds.}$$ d) $$\text{80 seconds.}$$ $$\text{After three half-lives (60 seconds), only 125 atoms (1/8th of 1000) remain.}$$ 5 / 40 Category: JAMB Physics 2017 5. $$\text{The correct expression for the potential at a point, distance r from a charge q, in an electric field is:}$$ a) $$\frac{q}{4 \pi \epsilon_0 r}.}$$ b) $$\frac{q}{2 \pi \epsilon_0 r^2}.}$$ c) $$\frac{q}{4 \pi \epsilon_0 r^2}.}$$ d) $$\frac{q}{4 \pi \epsilon_0 r}.}$$ $$\text{Potential is given by } V = \frac{q}{4 \pi \epsilon_0 r}. \text{ This relates charge, distance, and permittivity.}$$ 6 / 40 Category: JAMB Physics 2017 6. $$\text{In a discharge tube, most of the gas is pumped out so that electricity is conducted at:}$$ a) $$\text{Steady voltage.}$$ b) $$\text{High pressure.}$$ c) $$\text{Low pressure.}$$ d) $$\text{Low voltage.}$$ $$\text{Low pressure allows for ionization, enabling gas conduction in the tube. High pressure inhibits conduction.}$$ 7 / 40 Category: JAMB Physics 2017 7. $$\text{Which of these is a natural source of light? I. Moon, II. Sun, III. Streetlight, IV. Stars.}$$ a) $$\text{I, II, IV only.}$$ b) $$\text{I, II, III only.}$$ c) $$\text{III and IV only.}$$ d) $$\text{II and IV only.}$$ $$\text{Natural sources include the Sun and stars, as they emit light due to nuclear fusion. The Moon reflects light.}$$ 8 / 40 Category: JAMB Physics 2017 8. $$\text{An object placed at the bottom of a well full of clear water appears closer to the surface due to:}$$ a) $$\text{Refraction.}$$ b) $$\text{Reflection.}$$ c) $$\text{An inverter.}$$ d) $$\text{A magnifier.}$$ $$\text{Light rays bend towards the normal as they pass from water to air due to refraction.}$$ 9 / 40 Category: JAMB Physics 2017 9. $$\text{A boy drags a bag of rice along a smooth horizontal floor with a force of 2N at } 60^{\circ} \text{ to the floor. The work done after 3m is:}$$ a) $$\text{6 J.}$$ b) `text4J.\text{4 J.}text4J. c) `text5J.\text{5 J.}text5J. d) `text3J.\text{3 J.}text3J. `\text{Work done } = F \cdot d \cdot \cos(\theta). \text{ Substituting, } W = 2 \cdot 3 \cdot \cos(60^{\circ}) = 3 J.} 10 / 40 Category: JAMB Physics 2017 10. $$\text{The spheres of masses 5.0kg and 10.0kg are 0.3m apart. Calculate the force of attraction between them.}$$ a) $$\text{3.57 x } 10^{-2} \text{ N.}$$ b) $$\text{3.71 x } 10^{-2} \text{ N.}$$ c) $$\text{4.00 x } 10^{-2} \text{ N.}$$ d) $$\text{3.50 x } 10^{-2} \text{ N.}$$ $$\text{Using Newton’s law of gravitation: } F = \frac{G m_1 m_2}{r^2}. \text{ Substituting values, } F = 3.57 \times 10^{-2} \text{ N.}$$ 11 / 40 Category: JAMB Physics 2017 11. $$\text{When very hot water is poured into two identical thin and thick glass tumblers in equal volumes, the thick one cracks because:}$$ a) $$\text{Of the even expansion of glass.}$$ b) $$\text{Glass is a good conductor of heat.}$$ c) $$\text{Glass is a crystal.}$$ d) $$\text{Of the uneven expansion of glass.}$$ $$\text{Uneven expansion due to the thickness causes stress in the material, leading to cracking.}$$ 12 / 40 Category: JAMB Physics 2017 12. $$\text{The diagram above represents the stress-strain curve for a typical metal rod. What does X represent?}$$ a) $$\text{Yield point.}$$ b) $$\text{Breaking point.}$$ c) $$\text{Elastic limit.}$$ d) $$\text{Proportional limit.}$$ $$\text{The elastic limit is the maximum point beyond which permanent deformation occurs.}$$ 13 / 40 Category: JAMB Physics 2017 13. $$\text{Transverse waves can be distinguished from longitudinal waves using the characteristic of:}$$ a) $$\text{Diffraction.}$$ b) $$\text{Reflection.}$$ c) $$\text{Polarization.}$$ d) $$\text{Refraction.}$$ $$\text{Polarization occurs only in transverse waves due to oscillation perpendicular to wave propagation.}$$ 14 / 40 Category: JAMB Physics 2017 14. $$\text{Which of the following pairs of light rays shows the widest separation in the spectrum of white light?}$$ a) $$\text{Green and yellow.}$$ b) $$\text{Blue and red.}$$ c) $$\text{Indigo and violet.}$$ d) $$\text{Orange and red.}$$ $$\text{Red and blue are at the far ends of the visible spectrum, having the greatest wavelength difference.}$$ 15 / 40 Category: JAMB Physics 2017 15. $$\text{A transistor functions mainly as a:}$$ a) $$\text{Switch and amplifier.}$$ b) $$\text{Rectifier and amplifier.}$$ c) $$\text{Charge storer and switch.}$$ d) $$\text{Charge storer and amplifier.}$$ $$\text{Transistors are primarily used as switches to control circuits and amplifiers to enhance signals.}$$ 16 / 40 Category: JAMB Physics 2017 16. $$\text{A thin wire with heavy weights attached to both ends is hung over a block of ice resting on two supports. If the wire cuts through the ice block while the block remains solid behind the wire, the process is called:}$$ a) $$\text{Fusion.}$$ b) $$\text{Sublimation.}$$ c) $$\text{Regelation.}$$ d) $$\text{Condensation.}$$ $$\text{Regelation is the melting of ice under pressure and refreezing when the pressure is removed.}$$ 17 / 40 Category: JAMB Physics 2017 17. $$\text{The inner diameter of a small test tube can be measured accurately using a:}$$ a) $$\text{Micrometer screw gauge.}$$ b) $$\text{Pair of Vernier calipers.}$$ c) $$\text{Metre rule.}$$ d) $$\text{Pair of dividers.}$$ $$\text{Vernier calipers are precise tools for measuring small diameters, including the inner dimensions of test tubes.}$$ 18 / 40 Category: JAMB Physics 2017 18. $$\text{A platinum resistance thermometer records } 3.0W \text{ at } 0^{\circ}C \text{ and } 8.0W \text{ at } 100^{\circ}C. \text{ If it records } 6.0W \text{ in a certain environment, the temperature of the medium is:}$$ a) $$\text{60}^{\circ}\text{C.}$$ b) $$\text{80}^{\circ}\text{C.}$$ c) $$\text{50}^{\circ}\text{C.}$$ d) $$\text{30}^{\circ}\text{C.}$$ `\text{Temperature is proportional to resistance. Solving: } T = \frac{(R – R_0)}{(R_{100} – R_0)} \times 100. \text{ The result is } 60^{\circ}C.} 19 / 40 Category: JAMB Physics 2017 19. $$\text{Which angle is the angle of deviation of a ray of light passing through XYZ?}$$ a) $$\theta_1$$ b) $$\theta_2$$ c) $$\theta_3$$ d) $$\theta_4$$ $$\text{The angle of deviation is } \theta_2 \text{ in the diagram, representing the change in the path of the light ray.}$$ 20 / 40 Category: JAMB Physics 2017 20. $$\text{Which of the following is the dimension of pressure?}$$ a) $$M L^2 T^{-3}$$ b) $$M L T^{-2}$$ c) $$M L^{-1} T^{-2}$$ d) $$M L^{-3}$$ $$\text{Pressure } P = \frac{F}{A} = \frac{M L T^{-2}}{L^2} = M L^{-1} T^{-2}.}$$ 21 / 40 Category: JAMB Physics 2017 21. $$\text{A capacitor of } 8 \mu F \text{ is charged to a potential difference of } 100V. \text{ The energy stored by the capacitor is:}$$ a) $$1.0 \times 10^4 J$$ b) $$4.0 \times 10^{-2} J$$ c) $$1.25 \times 10 J$$ d) $$8.0 \times 10 J$$ $$\text{Energy stored in a capacitor is given by } E = \frac{1}{2} C V^2. \text{ Substituting the values: } E = 0.04 J.$$ 22 / 40 Category: JAMB Physics 2017 22. $$\text{Which of the following statements correctly describe(s) cathode rays?}$$ a) $$\text{I only.}$$ b) $$\text{III only.}$$ c) $$\text{I and II only.}$$ d) $$\text{II and III only.}$$ $$\text{Cathode rays consist of negatively charged particles (electrons) and are deflected in magnetic and electric fields.}$$ 23 / 40 Category: JAMB Physics 2017 23. $$\text{A concave mirror has a radius of curvature of } 36cm. \text{ At what distance from the mirror should an object be placed to give a real image three times the size of the object?}$$ a) $$12cm$$ b) $$24cm$$ c) $$48cm$$ d) $$108cm$$ $$\text{Using the mirror formula and magnification, the object distance is calculated as } 24cm.$$ 24 / 40 Category: JAMB Physics 2017 24. $$\text{The net capacitance in the circuit shown above is:}$$ a) $$8.0 \mu F$$ b) $$6.0 \mu F$$ c) $$2.0 \mu F$$ d) $$4.0 \mu F$$ $$\text{Capacitors in series add reciprocally: } \frac{1}{C_{total}} = \frac{1}{C_1} + \frac{1}{C_2}. \text{ The net capacitance is } 2.0 \mu F.$$ 25 / 40 Category: JAMB Physics 2017 25. $$\text{A sonometer wire of length } 100cm \text{ under a tension of } 10N \text{, has a frequency of } 250Hz. \text{ Keeping the length constant, the tension is adjusted to produce a new frequency of } 350Hz. \text{ The new tension is:}$$ a) $$5.1N$$ b) $$19.6N$$ c) $$14.0N$$ d) $$7.1N$$ $$\text{Tension is proportional to the square of frequency: } T_2 = T_1 \left( \frac{f_2}{f_1} \right)^2. \text{ Solving gives } 19.6N.$$ 26 / 40 Category: JAMB Physics 2017 26. $$\text{In a sound wave in air, the adjacent rarefactions and compressions are separated by a distance of } 17cm. \text{ If the velocity of the sound wave is } 340ms^{-1}, \text{ determine the frequency.}$$ a) $$10Hz$$ b) $$20Hz$$ c) $$5780Hz$$ d) $$2000Hz$$ $$\text{Frequency is } f = \frac{v}{\lambda}. \text{ Substituting values gives } f = 2000Hz.$$ 27 / 40 Category: JAMB Physics 2017 27. $$\text{A note is called an octave of another note when:}$$ a) $$\text{The notes have the same fundamental frequency.}$$ b) $$\text{Its frequency is half of the first note.}$$ c) $$\text{Its frequency is twice that of the first note.}$$ d) $$\text{Its periodic time is twice that of the first note.}$$ $$\text{An octave has a frequency twice that of the original note.}$$ 28 / 40 Category: JAMB Physics 2017 28. $$\text{A metallic strip of iron and brass was heated. Which of the following diagrams accurately illustrates the shape of the strip after heating?}$$ a) $$\text{Diagram A.}$$ b) $$\text{Diagram B.}$$ c) $$\text{Diagram C.}$$ d) $$\text{Diagram D.}$$ $$\text{Different expansion rates cause the strip to curve towards the metal with the lower coefficient of expansion.}$$ 29 / 40 Category: JAMB Physics 2017 29. $$\text{Which of the following is in a neutral equilibrium?}$$ a) $$\text{A heavy weight suspended on a string.}$$ b) $$\text{The beam of a balance in use.}$$ c) $$\text{A heavy-based table lamp.}$$ d) $$\text{A cone resting on its slant edge.}$$ $$\text{An object is in neutral equilibrium if its center of gravity does not change when disturbed.}$$ 30 / 40 Category: JAMB Physics 2017 30. $$\text{A convex mirror is used as a driving mirror because:}$$ a) $$\text{I and III only.}$$ b) $$\text{I and II only.}$$ c) $$\text{II and III only.}$$ d) $$\text{I, II and III only.}$$ $$\text{It provides an erect image and a large field of view, making it ideal for driving.}$$ 31 / 40 Category: JAMB Physics 2017 31. $$\text{What is the cost of running five } 50W \text{ lamps and four } 100W \text{ lamps for 10 hours if electrical energy costs 2 kobo per kWh?}$$ a) $$₦0.13$$ b) $$₦0.65$$ c) $$₦3.90$$ d) $$₦39.00$$ $$\text{Energy used = Power × Time. Calculate the total energy, then multiply by the cost per unit. The cost is ₦0.13.}$$ 32 / 40 Category: JAMB Physics 2017 32. $$\text{The specific latent heat of vaporization of a substance is always:}$$ a) $$\text{Less than its specific latent heat of fusion.}$$ b) $$\text{Equal to its specific latent heat of fusion.}$$ c) $$\text{Greater than its specific latent heat of fusion.}$$ d) $$\text{All of the above, depending on the nature of the substance.}$$ $$\text{The specific latent heat of vaporization is generally greater than its latent heat of fusion, as more energy is required to overcome intermolecular forces during vaporization.}$$ 33 / 40 Category: JAMB Physics 2017 33. $$\text{A hydrometer is an instrument for measuring the:}$$ a) $$\text{Depth of water in a vessel.}$$ b) $$\text{Relative humidity of the air.}$$ c) $$\text{Relative density of a liquid by finding the apparent loss in weight.}$$ d) $$\text{Relative density of a liquid by the method of flotation.}$$ $$\text{A hydrometer measures the relative density of liquids based on the principle of flotation.}$$ 34 / 40 Category: JAMB Physics 2017 34. $$\text{A transformer has 300 turns of wire in the primary coil and 30 turns in the secondary coil. If the input voltage is } 100V, \text{ the output voltage is:}$$ a) $$10V$$ b) $$5V$$ c) $$15V$$ d) $$20V$$ $$\text{Using the transformer formula: } \frac{V_s}{V_p} = \frac{N_s}{N_p}, \text{ the output voltage is } 10V.$$ 35 / 40 Category: JAMB Physics 2017 35. $$\text{The activity of a radioactive substance depends on:}$$ a) $$\text{Temperature and purity.}$$ b) $$\text{Purity and age.}$$ c) $$\text{Temperature and age.}$$ d) $$\text{Age, purity, and temperature.}$$ $$\text{Radioactive activity is influenced by the age and purity of the sample but not significantly by temperature.}$$ 36 / 40 Category: JAMB Physics 2017 36. $$\text{The speed of light in air is } 3 \times 10^8 m/s. \text{ If the refractive index of light from air to water is } \frac{4}{3}, \text{ the speed of light in water is:}$$ a) $$4 \times 10^8 m/s$$ b) $$2.23 \times 10^8 m/s$$ c) $$2.25 \times 10^8 m/s$$ d) $$\frac{4}{9} \times 10^8 m/s$$ $$\text{Speed of light in water } = \frac{\text{Speed of light in air}}{\text{Refractive index}}. \text{ Substituting values gives } 2.25 \times 10^8 m/s.$$ 37 / 40 Category: JAMB Physics 2017 37. $$\text{A magnet is moved through a coil of wire. The e.m.f produced in the wire depends on:}$$ a) $$\text{The number of turns in the coil.}$$ b) $$\text{The strength of the magnet.}$$ c) $$\text{The speed at which the magnet is moved.}$$ d) $$\text{All of the above.}$$ $$\text{Faraday’s law of electromagnetic induction states that e.m.f depends on the number of turns, magnet strength, and the speed of movement.}$$ 38 / 40 Category: JAMB Physics 2017 38. $$\text{A charge of one coulomb liberates } 0.0033g \text{ of copper in an electrolytic process. How long will it take a current of } 2A \text{ to liberate } 1.98g \text{ of copper in such a process?}$$ a) $$30 \text{ minutes}$$ b) $$5 \text{ minutes}$$ c) $$50 \text{ minutes}$$ d) $$60 \text{ minutes}$$ $$\text{Using the formula: mass deposited } = ZIt, \text{ the time is calculated as } 50 \text{ minutes.}$$ 39 / 40 Category: JAMB Physics 2017 39. $$\text{If a metal wire } 4m \text{ long and cross-sectional area } 0.8 \, mm^2 \text{ has a resistance of } 60 \Omega, \text{ find the resistivity of the wire.}$$ a) $$5.3 \times 10^{-7} \Omega \cdot m$$ b) $$3.0 \times 10^{-5} \Omega \cdot m$$ c) $$1.2 \times 10^{-6} \Omega \cdot m$$ d) $$3.2 \times 10^{-6} \Omega \cdot m$$ $$\text{Using the formula: } \rho = R \frac{A}{L}, \text{ the resistivity is calculated as } 1.2 \times 10^{-6} \Omega \cdot m.$$ 40 / 40 Category: JAMB Physics 2017 40. $$\text{What range of temperature is the expansion of water anomalous?}$$ a) $$+208^\circ C \text{ to } +212^\circ C$$ b) $$-80^\circ C \text{ to } -76^\circ C$$ c) $$0^\circ C \text{ to } 4^\circ C$$ d) $$-4^\circ C \text{ to } 0^\circ C$$ $$\text{Water exhibits anomalous expansion between } 0^\circ C \text{ and } 4^\circ C, \text{ where it expands as it cools and contracts as it heats.}$$ Your score is The average score is 0% LinkedIn Facebook Twitter VKontakte 0% Restart quiz Anonymous feedback Send feedback
