2015 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 2015 JAMB PHYSICS PAST QUESTIONS AND ANSWERS 1 / 40 Category: JAMB Physics 2015 1. $$\text{A piece of rubber 10cm long stretches 6mm when a load of 100N is hung from it. What is the strain?}$$ a) $$6 \times 10^{-3}.}$$ b) $$6.}$$ c) $$60.}$$ d) $$6.0 \times 10^{-3}.}$$ $$\text{Strain is defined as the ratio of extension to original length: } \frac{6 \text{mm}}{10 \text{cm}} = 6 \times 10^{-3}.}$$ 2 / 40 Category: JAMB Physics 2015 2. $$\text{The diagram above shows the lens arrangement in which optical instrument?}$$ a) $$\text{Compound microscope.}$$ b) $$\text{Binocular.}$$ c) $$\text{Astronomical telescope.}$$ d) $$\text{Periscope.}$$ $$\text{The lens arrangement matches that of an astronomical telescope.}$$ 3 / 40 Category: JAMB Physics 2015 3. $$\text{What is the total resistance in the circuit shown in the diagram?}$$ a) $$5 \Omega.}$$ b) $$25 \Omega.}$$ c) $$15 \Omega.}$$ d) $$35 \Omega.}$$ $$\text{Total resistance for resistors in series is } R = R_1 + R_2 + R_3 = 5 \Omega + 10 \Omega + 10 \Omega = 25 \Omega.}$$ 4 / 40 Category: JAMB Physics 2015 4. $$\text{A 6kg body rests on an inclined plane. The angle of inclination, } \theta \text{, is:}$$ a) $$15^{\circ}.}$$ b) $$60^{\circ}.}$$ c) $$45^{\circ}.}$$ d) $$30^{\circ}.}$$ $$\text{Given } F = mg\sin\theta, F = 30N, m = 6kg, g = 10ms^{-2}. \sin\theta = \frac{30}{60} = 0.5. \theta = 30^{\circ}.}$$ 5 / 40 Category: JAMB Physics 2015 5. $$\text{The speed of light in air is } 3.0 \times 10^{8} \text{ms}^{-1}. \text{ In glass (refractive index } 1.65)\text{?}$$ a) $$1.82 \times 10^{8} \text{ms}^{-1}.}$$ b) $$3.00 \times 10^{8} \text{ms}^{-1}.}$$ c) $$4.95 \times 10^{8} \text{ms}^{-1}.}$$ d) `1.65 \times 10^{8} \text{ms}^{-1}.} `\text{Speed of light in glass is } \frac{3.0 \times 10^{8}}{1.65} = 1.82 \times 10^{8} \text{ms}^{-1}.} 6 / 40 Category: JAMB Physics 2015 6. $$\text{Longitudinal waves do not exhibit which of these phenomena?}$$ a) $$\text{Refraction.}$$ b) $$\text{Polarization.}$$ c) $$\text{Diffraction.}$$ d) $$\text{Reflection.}$$ $$\text{Polarization is a property of transverse waves, not longitudinal waves.}$$ 7 / 40 Category: JAMB Physics 2015 7. $$\text{Which device converts sound energy into electrical energy?}$$ a) $$\text{Horn of a motor car.}$$ b) $$\text{Telephone earpiece.}$$ c) $$\text{Loudspeaker.}$$ d) $$\text{Microphone.}$$ $$\text{A microphone converts sound energy into electrical energy.}$$ 8 / 40 Category: JAMB Physics 2015 8. $$\text{What is an essential property of a good calorimeter?}$$ a) $$\text{Low specific heat capacity and low heat conductivity.}$$ b) $$\text{High specific heat capacity and low heat conductivity.}$$ c) $$\text{High specific heat capacity and low heat conductivity.}$$ d) $$\text{Low specific heat capacity and high heat conductivity.}$$ $$\text{A good calorimeter should have low specific heat capacity and low heat conductivity to minimize energy loss.}$$ 9 / 40 Category: JAMB Physics 2015 9. $$\text{Which of the following is most strongly deflected by a magnetic field?}$$ a) $$\beta\text{-particles.}$$ b) $$\chi\text{-particles.}$$ c) $$\gamma\text{-rays.}$$ d) $$\chi\text{-rays.}$$ $$\text{Beta particles are negatively charged and are most strongly deflected by magnetic fields.}$$ 10 / 40 Category: JAMB Physics 2015 10. $$\text{The water surface at the glass-water interface is not horizontal due to?}$$ a) $$\text{Friction.}$$ b) $$\text{Surface tension.}$$ c) $$\text{Viscosity.}$$ d) $$\text{Evaporation.}$$ $$\text{Surface tension causes the water to curve at the glass-water interface.}$$ 11 / 40 Category: JAMB Physics 2015 11. $$\text{What does a dynamo primarily do?}$$ a) $$\text{Potential energy to kinetic energy.}$$ b) $$\text{Electrical energy to kinetic energy.}$$ c) $$\text{Mechanical energy to electrical energy.}$$ d) $$\text{Kinetic energy to potential energy.}$$ $$\text{A dynamo converts mechanical energy into electrical energy through electromagnetic induction.}$$ 12 / 40 Category: JAMB Physics 2015 12. $$\text{A particle is injected into an electric field and follows a curved path. It is most likely?}$$ a) $$\text{Gamma ray.}$$ b) $$\text{Proton.}$$ c) $$\text{Neutron.}$$ d) $$\text{Electron.}$$ $$\text{An electron, being negatively charged, curves due to the force exerted by the electric field.}$$ 13 / 40 Category: JAMB Physics 2015 13. $$\text{In which diagram does the tube length equal one wavelength?}$$ a) $$\text{Correct diagram showing one wavelength.}$$ b) $$\text{Incorrect diagrams showing other conditions.}$$ c) $$\text{Incorrect diagrams showing partial wavelengths.}$$ d) $$\text{Incorrect diagrams with no wave representation.}$$ $$\text{For one wavelength, the diagram must show the full cycle of a wave.}$$ 14 / 40 Category: JAMB Physics 2015 14. $$\text{Why is a calibrated potentiometer used to measure e.m.f. of a cell?}$$ a) $$\text{Internal resistance is small compared to potentiometer.}$$ b) $$\text{Potentiometer takes no current from the cell.}$$ c) $$\text{Potentiometer has a linear scale.}$$ d) $$\text{Potentiometer resistance is less than voltmeter.}$$ $$\text{A potentiometer does not draw current from the cell, ensuring accurate e.m.f. measurement.}$$ 15 / 40 Category: JAMB Physics 2015 15. $$\text{Which of these is a vector quantity?}$$ a) $$\text{Electric charge.}$$ b) $$\text{Electric potential difference.}$$ c) $$\text{Electric field.}$$ d) $$\text{Electrical capacitance.}$$ $$\text{Electric field is a vector quantity because it has both magnitude and direction.}$$ 16 / 40 Category: JAMB Physics 2015 16. $$\text{The photocell operates on which principle?}$$ a) $$\text{Voltaic cell.}$$ b) $$\text{Photographic plate.}$$ c) $$\text{Emission of protons.}$$ d) $$\text{Emission of electrons.}$$ $$\text{A photocell emits electrons when exposed to incident radiation, based on the photoelectric effect.}$$ 17 / 40 Category: JAMB Physics 2015 17. $$\text{An atom becomes what after losing or gaining a charge?}$$ a) $$\text{Electron.}$$ b) $$\text{Neutron.}$$ c) $$\text{Proton.}$$ d) $$\text{Ion.}$$ $$\text{An atom that gains or loses electrons becomes an ion.}$$ 18 / 40 Category: JAMB Physics 2015 18. $$\text{Which wave property measures sea depth?}$$ a) $$\text{Diffraction.}$$ b) $$\text{Reflection.}$$ c) $$\text{Refraction.}$$ d) $$\text{Interference.}$$ $$\text{Reflection is used in sonar technology to measure the depth of the sea.}$$ 19 / 40 Category: JAMB Physics 2015 19. $$\text{What does a nuclear fusion process produce?}$$ a) $$\text{One heavy nucleus and neutrons.}$$ b) $$\text{Neutrons and protons.}$$ c) $$\text{Heavy nucleus and energy.}$$ d) $$\text{Neutrons and energy.}$$ $$\text{Nuclear fusion results in neutrons and energy being released as products.}$$ 20 / 40 Category: JAMB Physics 2015 20. $$\text{Which kettle cools down faster: soot-covered or polished?}$$ a) $$\text{Both cool down at the same rate.}$$ b) $$\text{Polished kettle cools faster.}$$ c) $$\text{Soot-covered kettle cools faster.}$$ d) $$\text{Soot cools by convection.}$$ $$\text{Soot-covered kettles radiate heat more efficiently than polished ones.}$$ 21 / 40 Category: JAMB Physics 2015 21. $$\text{What condition results in a total eclipse of the sun?}$$ a) $$\text{Moon between sun and earth.}$$ b) $$\text{Sun between moon and earth.}$$ c) $$\text{Earth between moon and sun.}$$ d) $$\text{Ozone layer threatened.}$$ $$\text{A total solar eclipse occurs when the moon is positioned between the sun and the earth.}$$ 22 / 40 Category: JAMB Physics 2015 22. $$\text{Which color pair provides the widest spectrum separation?}$$ a) $$\text{Green and yellow.}$$ b) $$\text{Red and violet.}$$ c) $$\text{Red and indigo.}$$ d) $$\text{Yellow and violet.}$$ $$\text{Red and violet have the widest separation in the spectrum due to their vastly different wavelengths.}$$ 23 / 40 Category: JAMB Physics 2015 23. $$\text{What is in phase for a body in simple harmonic motion?}$$ a) $$\text{Displacement and velocity.}$$ b) $$\text{Displacement and force.}$$ c) $$\text{Velocity and acceleration.}$$ d) $$\text{Force and acceleration.}$$ $$\text{Force and acceleration are in phase because both depend on displacement.}$$ 24 / 40 Category: JAMB Physics 2015 24. $$\text{Where should a force of 2N be placed to balance a uniform meter rule pivoted at 30 cm?}$$ a) $$\text{95 cm.}$$ b) $$\text{5 cm.}$$ c) $$\text{20 cm.}$$ d) $$\text{25 cm.}$$ $$\text{To balance the moments about the pivot, the force must be placed at 95 cm from the pivot.}$$ 25 / 40 Category: JAMB Physics 2015 25. $$\text{What is the relative density of a liquid where a solid weighs 10N in air and 7N when immersed?}$$ a) $$\text{3/4.}$$ b) $$\text{4/3.}$$ c) $$\text{5/3.}$$ d) $$\text{7/10.}$$ $$\text{Relative density is calculated as (Weight in air – Weight in liquid) / (Weight in air – Weight in water).}$$ 26 / 40 Category: JAMB Physics 2015 26. $$\text{What content does a maximum and minimum thermometer contain?}$$ a) $$\text{Air, alcohol, and mercury.}$$ b) $$\text{Alcohol, mercury, and alcohol.}$$ c) $$\text{Mercury, alcohol, and mercury.}$$ d) $$\text{Air, mercury, and alcohol.}$$ $$\text{Maximum and minimum thermometers typically use mercury, alcohol, and air for measurements.}$$ 27 / 40 Category: JAMB Physics 2015 27. $$\text{What energy production process occurs in the sun?}$$ a) $$\text{Nuclear fission.}$$ b) $$\text{Nuclear fusion.}$$ c) $$\text{Electron collision.}$$ d) $$\text{Radioactive decay.}$$ $$\text{The sun’s energy comes from nuclear fusion, combining hydrogen nuclei to form helium.}$$ 28 / 40 Category: JAMB Physics 2015 28. $$\text{What particle is responsible for nuclear fission in reactors?}$$ a) $$\text{Electron.}$$ b) $$\text{Photon.}$$ c) $$\text{Proton.}$$ d) $$\text{Neutron.}$$ $$\text{Neutrons trigger nuclear fission by splitting atomic nuclei.}$$ 29 / 40 Category: JAMB Physics 2015 29. $$\text{What is the uncertainty in momentum for a particle with position uncertainty of $5×10^{-10}$ m?}$$ a) $$\text{1.32 × 10^{-24} Ns.}$$ b) $$\text{3.30 × 10^{-44} Ns.}$$ c) $$\text{1.32 × 10^{-44} Ns.}$$ d) $$\text{3.30 × 10^{-24} Ns.}$$ $$\text{Using Heisenberg’s uncertainty principle, ΔxΔp ≥ ℏ/2, calculate momentum uncertainty.}$$ 30 / 40 Category: JAMB Physics 2015 30. $$\text{What is the volume change when 450 kg of ice melts completely?}$$ a) $$\text{0.50 m^3.}$$ b) $$\text{0.45 m^3.}$$ c) $$\text{4.50 m^3.}$$ d) $$\text{0.05 m^3.}$$ $$\text{Volume change depends on the densities of ice and water, using mass/density for both states.}$$ 31 / 40 Category: JAMB Physics 2015 31. $$\text{What happens to conductivity when impurities are added to a semiconductor?}$$ a) $$\text{Conductivity increases.}$$ b) $$\text{Conductivity decreases.}$$ c) $$\text{Conductivity fluctuates.}$$ d) $$\text{No effect on conductivity.}$$ $$\text{Adding impurities (doping) increases conductivity by introducing additional charge carriers.}$$ 32 / 40 Category: JAMB Physics 2015 32. $$\text{What is the term for free electrons leaving a hot metal’s surface?}$$ a) $$\text{Photo emission.}$$ b) $$\text{Thermionic emission.}$$ c) $$\text{Photon emission.}$$ d) $$\text{Electron emission.}$$ $$\text{Thermionic emission refers to electron release from heated metal surfaces.}$$ 33 / 40 Category: JAMB Physics 2015 33. $$\text{What setup ensures a pure light spectrum is produced?}$$ a) $$\text{Triangular prism only.}$$ b) $$\text{Triangular prism and concave lens.}$$ c) $$\text{Glass prism and pin.}$$ d) $$\text{Triangular prism with convex lenses.}$$ $$\text{A triangular prism with two convex lenses ensures dispersion of light into its component colors for a pure spectrum.}$$ 34 / 40 Category: JAMB Physics 2015 34. $$\text{Why do petrol tankers have chains attached?}$$ a) $$\text{Conduct excess charges to earth.}$$ b) $$\text{Ensure tanker balance.}$$ c) $$\text{Warn against overspeeding.}$$ d) $$\text{Generate more friction.}$$ $$\text{Chains help conduct excess static charges to the ground, preventing buildup and sparking.}$$ 35 / 40 Category: JAMB Physics 2015 35. $$\text{What is a perfect emitter or absorber of radiant energy called?}$$ a) $$\text{White body.}$$ b) $$\text{Red body.}$$ c) $$\text{Conductor.}$$ d) $$\text{Black body.}$$ $$\text{A black body perfectly absorbs and emits all radiant energy.}$$ 36 / 40 Category: JAMB Physics 2015 36. $$\text{What is the effective e.m.f. of six identical cells, each of 2V, connected as shown?}$$ a) $$\text{4V.}$$ b) $$\text{0V.}$$ c) $$\text{6V.}$$ d) $$\text{12V.}$$ $$\text{Depending on their configuration, the combined e.m.f. equals 4V.}$$ 37 / 40 Category: JAMB Physics 2015 37. $$\text{What is the power of a pump lifting 5000kg of water through 60m in 50 minutes?}$$ a) $$\text{2.5 × 10^5 Js^{-1}.}$$ b) $$\text{3.3 × 10^3 Js^{-1}.}$$ c) $$\text{2.5 × 10^4 Js^{-1}.}$$ d) $$\text{3.3 × 10^2 Js^{-1}.}$$ $$\text{Power = (Work done)/(Time). Use work-energy principle and g = 10m/s^2.}$$ 38 / 40 Category: JAMB Physics 2015 38. $$\text{What is the frequency of a wave with a 15cm wavelength and 300ms^{-1} velocity?}$$ a) $$\text{4.5 × 10^5 Hz.}$$ b) $$\text{4.5 × 10^2 Hz.}$$ c) $$\text{2.0 × 10^3 Hz.}$$ d) $$\text{2.0 × 10^2 Hz.}$$ $$\text{Frequency = Velocity/Wavelength. Convert cm to meters for wavelength.}$$ 39 / 40 Category: JAMB Physics 2015 39. $$\text{How much energy is generated by a 240V, 60W electric lamp in one hour?}$$ a) $$\text{3.86 × 10^5 J.}$$ b) $$\text{2.16 × 10^5 J.}$$ c) $$\text{1.80 × 10^4 J.}$$ d) $$\text{3.56 × 10^5 J.}$$ $$\text{Energy = Power × Time. Convert time into seconds for calculation.}$$ 40 / 40 Category: JAMB Physics 2015 40. $$\text{What part of the eye corresponds to the film in a camera?}$$ a) $$\text{Iris.}$$ b) $$\text{Pupil.}$$ c) $$\text{Retina.}$$ d) $$\text{Cornea.}$$ $$\text{The retina in the human eye functions like the film in a camera, capturing the image.}$$ Your score is The average score is 0% LinkedIn Facebook Twitter VKontakte 0% Restart quiz Anonymous feedback Send feedback
