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