2011 JAMB PHYSICS PAST QUESTIONS AND ANSWER 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 2011 JAMB PHYSICS PAST QUESTIONS AND ANSWER 1 / 50 Category: JAMB Physics 2011 1. $$\text{Which Question Paper Type of Physics is given to you?}$$ a) $$\text{Type A.}$$ b) $$\text{Type B.}$$ c) $$\text{Type C.}$$ d) $$\text{Type D.}$$ $$\text{Paper type is identified by options A to D. Question specifies Type C, making it correct.}$$ 2 / 50 Category: JAMB Physics 2011 2. $$\text{A carpenter dropped a hammer (1.5 kg) from 20 m roof. Kinetic energy before hitting?}$$ a) $$\text{450 J.}$$ b) $$\text{600 J.}$$ c) $$\text{150 J.}$$ d) $$\text{300 J.}$$ $$\text{KE = mgh = 1.5 × 10 × 20 = 300 J. Correct answer is 300 J.}$$ 3 / 50 Category: JAMB Physics 2011 3. $$\text{Positions of balls X (5g) and Y (50kg) after being thrown vertically at 100 ms}^{-1}\text{ after 1 second?}$$ a) $$\text{Both 500m away.}$$ b) $$\text{500m apart.}$$ c) $$\text{Y ahead.}$$ d) $$\text{X ahead.}$$ $$\text{All objects fall under gravity equally; positions will be the same, unaffected by mass difference.}$$ 4 / 50 Category: JAMB Physics 2011 4. $$\text{Why does a man in a descending lift feel weightless?}$$ a) $$\text{No gravity.}$$ b) $$\text{Airtight lift.}$$ c) $$\text{Lift in vacuum.}$$ d) $$\text{No floor reaction.}$$ $$\text{No reaction force from floor; normal force is zero, making the man feel weightless.}$$ 5 / 50 Category: JAMB Physics 2011 5. $$\text{Resultant of vectors at right angles: sides are 5 N and 12 N. Find resultant.}$$ a) $$\text{13.0 N.}$$ b) $$\text{14.0 N.}$$ c) $$\text{10.0 N.}$$ d) $$\text{12.0 N.}$$ $$\text{Resultant } R = \sqrt{(5)^2 + (12)^2} = 13 \text{ N. Use Pythagoras theorem.}$$ 6 / 50 Category: JAMB Physics 2011 6. $$\text{Centripetal force on 2 kg object moving at 10 ms}^{-1}\text{ in 4 m radius circle?}$$ a) $$\text{40 N.}$$ b) $$\text{25 N.}$$ c) $$\text{100 N.}$$ d) $$\text{50 N.}$$ $$\text{F = mv}^2/r\text{ = } 2 \times (10)^2/4 = 50 \text{ N.}$$ 7 / 50 Category: JAMB Physics 2011 7. $$\text{Object falls freely for 3 seconds. Distance covered?}$$ [g = 10 \text{ms}^{-2}]$$ a) $$\text{60 m.}$$ b) $$\text{90 m.}$$ c) $$\text{30 m.}$$ d) $$\text{45 m.}$$ $$\text{s = 0.5gt}^{2}\text{ = 0.5 × 10 × 9 = 45 m. Correct distance is 45 m.}$$ 8 / 50 Category: JAMB Physics 2011 8. $$\text{Position(s) of neutral equilibrium of cone (see diagrams)?}$$ a) $$\text{Y and X.}$$ b) $$\text{Z only.}$$ c) $$\text{X only.}$$ d) $$\text{Y and Z.}$$ $$\text{Neutral equilibrium is when displacement does not alter center of gravity; position Z qualifies.}$$ 9 / 50 Category: JAMB Physics 2011 9. $$\text{Tube of small radius in liquid; what happens if liquid wets or doesn’t wet glass?}$$ a) $$\text{Rise if no wetting.}$$ b) $$\text{Remain same level.}$$ c) $$\text{Fall if wets glass.}$$ d) $$\text{Fall if no wetting.}$$ $$\text{Capillarity causes rise if it wets, fall if it doesn’t wet the glass. Answer depends on liquid property.}$$ 10 / 50 Category: JAMB Physics 2011 10. $$\text{What determines liquid pressure: density, depth, or surface area?}$$ a) $$\text{I and III only.}$$ b) $$\text{I and II only.}$$ c) $$\text{II and III only.}$$ d) $$\text{I, II, III.}$$ $$\text{Pressure depends on density and depth only (P = ρgh); surface area doesn’t affect it.}$$ 11 / 50 Category: JAMB Physics 2011 11. $$\text{Qualities of a good thermometer: thermal capacity, sensitivity, readability, accuracy?}$$ a) $$\text{II, III, IV.}$$ b) $$\text{I and II.}$$ c) $$\text{I, II, III, IV.}$$ d) $$\text{I, III, IV.}$$ $$\text{All four (I, II, III, IV) are essential qualities of a good thermometer for accurate and readable temperature measurements.}$$ 12 / 50 Category: JAMB Physics 2011 12. $$\text{Machine lifts load of 20N through 10m, efficiency = 40%; find work done.}$$ a) $$\text{120 J.}$$ b) $$\text{80 J.}$$ c) $$\text{500 J.}$$ d) $$\text{300 J.}$$ $$\text{Efficiency = (useful work done / work input) × 100. Work input = 20 × 10/0.4 = 500 J.}$$ 13 / 50 Category: JAMB Physics 2011 13. $$\text{Which of the following is most effective in reducing friction: petrol, kerosene, grease, or water?}$$ a) $$\text{Petrol.}$$ b) $$\text{Kerosene.}$$ c) $$\text{Grease.}$$ d) $$\text{Water.}$$ $$\text{Grease is commonly used to reduce friction in machinery because of its viscosity and staying power on surfaces.}$$ 14 / 50 Category: JAMB Physics 2011 14. $$\text{Copper wire tensile stress is } 7.7 \times 10^7 \text{ Nm}^{-2}, \text{ Young’s modulus } 1.1 \times 10^{11} \text{ Nm}^{-2}. \text{Find strain.}$$ a) $$\text{2.2 } \times 10^{-4}$$ b) $$\text{2.0 } \times 10^{-5}$$ c) $$\text{7.0 } \times 10^{-3}$$ d) $$\text{7.0 } \times 10^{-4}$$ $$\text{Strain = stress/Young’s modulus = } \frac{7.7 \times 10^7}{1.1 \times 10^{11}} \text{ = } 7.0 \times 10^{-4}. $$ 15 / 50 Category: JAMB Physics 2011 15. $$\text{Object weighs 22 kg in water, 30 kg in air; calculate upthrust. g = 10 \text{ms}^{-2}}$$ a) $$\text{80 N.}$$ b) $$\text{50 N.}$$ c) $$\text{520 N.}$$ d) $$\text{220 N.}$$ $$\text{Upthrust = weight in air – weight in water = (30 – 22) × 10 = 80 N.}$$ 16 / 50 Category: JAMB Physics 2011 16. $$\text{30 W heater raises aluminum block temperature by 100 °C in 5 minutes. Find heat capacity.}$$ a) $$\text{200 JK}^{-1}$$ b) $$\text{900 JK}^{-1}$$ c) $$\text{90 JK}^{-1}$$ d) $$\text{100 JK}^{-1}$$ $$\text{Heat = power × time = 30 × 300 = 9000 J. Heat capacity = heat/temp change = 9000/100 = 90 J/K.}$$ 17 / 50 Category: JAMB Physics 2011 17. $$\text{Perfect absorber or emitter of radiant energy is called?}$$ a) $$\text{Red body.}$$ b) $$\text{Conductor.}$$ c) $$\text{Black body.}$$ d) $$\text{White body.}$$ $$\text{Black bodies are ideal emitters/absorbers in radiation physics.}$$ 18 / 50 Category: JAMB Physics 2011 18. $$\text{Which phenomenon demonstrates that pressure lowers melting points?}$$ a) $$\text{Regelation.}$$ b) $$\text{Sublimation.}$$ c) $$\text{Condensation.}$$ d) $$\text{Coagulation.}$$ $$\text{Regelation (refreezing) happens when ice melts under pressure and refreezes when pressure is released.}$$ 19 / 50 Category: JAMB Physics 2011 19. $$\text{Gas volume increases as temperature decreases at constant pressure. Law obeyed?}$$ a) $$\text{Charles' law.}$$ b) $$\text{Graham's law.}$$ c) $$\text{Boyle's law.}$$ d) $$\text{Pressure law.}$$ $$\text{Charles’ law states V ∝ T (volume directly proportional to temperature at constant pressure).}$$ 20 / 50 Category: JAMB Physics 2011 20. $$\text{Steam burn vs boiling water burn: which is more severe and why?}$$ a) $$\text{Depends on humidity.}$$ b) $$\text{Independent of humidity.}$$ c) $$\text{Steam has higher heat energy.}$$ d) $$\text{Water boils higher.}$$ $$\text{Steam contains latent heat, making burns more severe compared to boiling water of the same temperature.}$$ 21 / 50 Category: JAMB Physics 2011 21. $$\text{Which wave requires a medium for propagation? Sound, light, or radio?}$$ a) $$\text{X-rays.}$$ b) $$\text{Sound waves.}$$ c) $$\text{Light waves.}$$ d) $$\text{Radio waves.}$$ $$\text{Sound waves need a medium, unlike light or radio waves which are electromagnetic and propagate in a vacuum.}$$ 22 / 50 Category: JAMB Physics 2011 22. $$\text{Why is the ground cold at night? Reflection, radiation, or lack of sun?}$$ a) $$\text{Atmosphere reflects sun's energy.}$$ b) $$\text{Atmosphere absorbs sun's energy.}$$ c) $$\text{Earth radiates heat.}$$ d) $$\text{No sunlight.}$$ $$\text{The earth radiates heat to the atmosphere at night, losing heat without sunlight to replenish it.}$$ 23 / 50 Category: JAMB Physics 2011 23. $$\text{Metal volume = 40cm}^3\text{; temperature rises from } 30^{\circ}C \text{ to } 90^{\circ}C; \alpha = 2 \times 10^{-5} \text{ K}^{-1}. \text{Find volume increase.}$$ a) $$\text{0.40 cm}^3$$ b) $$\text{0.14 cm}^3$$ c) $$\text{0.12 cm}^3$$ d) $$\text{1.20 cm}^3$$ $$\text{Volume expansion } \Delta V = \beta V_0 \Delta T, \beta = 3\alpha. \Delta V = 3 \times 2\times 10^{-5} \times 40 \times 60 = 0.12 \text{cm}^3. $$ 24 / 50 Category: JAMB Physics 2011 24. $$\text{Which kinetic theory processes: change of state, diffusion, radiation, osmosis?}$$ a) $$\text{I, II, IV.}$$ b) $$\text{I, II, III, IV.}$$ c) $$\text{I, II, III.}$$ d) $$\text{I, III, IV.}$$ $$\text{Kinetic theory explains state change, diffusion, and radiation based on particle motion, not osmosis.}$$ 25 / 50 Category: JAMB Physics 2011 25. $$\text{What is the defect called when the human eye loses accommodation?}$$ a) $$\text{Long-sightedness.}$$ b) $$\text{Short-sightedness.}$$ c) $$\text{Presbyopia.}$$ d) $$\text{Astigmatism.}$$ $$\text{Presbyopia, often age-related, causes inability to focus on objects at varying distances.}$$ 26 / 50 Category: JAMB Physics 2011 26. $$\text{Wire frequency changes from 255 Hz under 225 N to 324 N tension. Find new frequency.}$$ a) $$\text{306 Hz.}$$ b) $$\text{512 Hz.}$$ c) $$\text{488 Hz.}$$ d) $$\text{356 Hz.}$$ $$\text{Frequency ratio } \sqrt{F_2/F_1}; \text{new } f = 255 \sqrt{324/225} \approx 306 \text{ Hz.}$$ 27 / 50 Category: JAMB Physics 2011 27. $$\text{Power of converging lens for far-sighted person who can’t see closer than 50 cm, but needs 25 cm.}$$ a) $$\text{0.04 D.}$$ b) $$\text{0.06 D.}$$ c) $$\text{0.02 D.}$$ d) $$\text{0.03 D.}$$ $$\text{Power } P = 1/f; f = (50 \times 25)/(50-25) \text{ cm } = 25 \text{ cm } = 0.04 \text{ D.}$$ 28 / 50 Category: JAMB Physics 2011 28. $$\text{Electromagnetic wave with the highest frequency: X-rays, UV, radio, or infrared?}$$ a) $$\text{X-rays.}$$ b) $$\text{Ultra-violet rays.}$$ c) $$\text{Radio waves.}$$ d) $$\text{Infrared rays.}$$ $$\text{X-rays have the highest frequency among the options, followed by UV, infrared, and radio waves.}$$ 29 / 50 Category: JAMB Physics 2011 29. $$\text{Red rose in blue light appears: yellow, red, blue, or magenta?}$$ a) $$\text{Yellow.}$$ b) $$\text{Red.}$$ c) $$\text{Blue.}$$ d) $$\text{Magenta.}$$ $$\text{Red rose absorbs blue light and appears black or blue depending on dye and pigment absorption.}$$ 30 / 50 Category: JAMB Physics 2011 30. $$\text{Under what condition does a solar eclipse occur?}$$ a) $$\text{Moon's umbra on Earth.}$$ b) $$\text{Moon between sun and Earth.}$$ c) $$\text{Earth between sun and moon.}$$ d) $$\text{Moon not hidden fully.}$$ $$\text{A solar eclipse happens when the moon is between the earth and sun, casting its umbra on the earth.}$$ 31 / 50 Category: JAMB Physics 2011 31. $$\text{Time taken for sound to travel 4.95 km if speed of sound is 333 m/s.}$$ a) $$\text{15 s.}$$ b) $$\text{0 s.}$$ c) $$\text{10 s.}$$ d) $$\text{12 s.}$$ $$\text{Time } t = d/v = 4950/333 = 15 \text{ seconds.}$$ 32 / 50 Category: JAMB Physics 2011 32. $$\text{Upright magnified image from convex lens with } m=3 \text{ and } f=15\text{ cm. Find object distance.}$$ a) $$\text{14 cm.}$$ b) $$\text{10 cm.}$$ c) $$\text{25 cm.}$$ d) $$\text{26 cm.}$$ $$\text{For upright magnified image, } u=f(m+1)/m = 15(3+1)/3 = 20 \text{ cm.}$$ 33 / 50 Category: JAMB Physics 2011 33. $$\text{Capacitance of parallel plate capacitor in air = 20 μF; with dielectric = 60 μF. Find dielectric constant.}$$ a) $$\text{2.0.}$$ b) $$\text{0.3.}$$ c) $$\text{6.0.}$$ d) $$\text{3.0.}$$ $$\text{Dielectric constant } K = C_{\text{with dielectric}} / C_{\text{air}} = 60 / 20 = 3.0. $$ 34 / 50 Category: JAMB Physics 2011 34. $$\text{Three resistors (2Ω, 4Ω, 12Ω) in parallel with 12V across them. Find current through 12Ω resistor.}$$ a) $$\text{9.6 A.}$$ b) $$\text{14.4 A.}$$ c) $$\text{1.0 A.}$$ d) $$\text{3.2 A.}$$ $$\text{Current } I = V/R = 12/12 = 1 \text{ A.}$$ 35 / 50 Category: JAMB Physics 2011 35. $$\text{Find cost of running appliance rated at 2.5 V, 2 A for 6 hours if charge per kWh is } \text{₦4.}$$ a) $$\text{₦24.}$$ b) $$\text{₦0.12.}$$ c) $$\text{₦12.}$$ d) $$\text{₦16.}$$ $$\text{Energy } E = VIt; \text{Cost } = E \times \text{rate}. \text{ E = 2.5} \times 2 \times 6/1000 = 0.03 \text{ kWh; cost } = 0.03 \times 4 = \text{₦12.}$$ 36 / 50 Category: JAMB Physics 2011 36. $$\text{Expression for potential at distance } r \text{ from charge } q \text{ in electric field.}$$ a) $$\text{q / } 4GOr^2. $$ b) $$\text{q / } 4GOr. $$ c) $$\text{q/2 } 4GOr^2. $$ d) $$\text{q/2 } 4GOr. $$ $$\text{Potential } V = q / (4\pi\epsilon_0 r). $$ 37 / 50 Category: JAMB Physics 2011 37. $$\text{Three 2V cells with 2Ω resistance each connected in parallel. Find total emf and resistance.}$$ a) $$\text{6 V, 0.7Ω.}$$ b) $$\text{6 V, 6.0Ω.}$$ c) $$\text{2 V, 0.7Ω.}$$ d) $$\text{2 V, 6.0Ω.}$$ $$\text{Total emf in parallel = single emf = 2 V; resistance in parallel: } 1/R = 1/2 + 1/2 + 1/2 \Rightarrow R=2/3Ω. $$ 38 / 50 Category: JAMB Physics 2011 38. $$\text{Why are electrical appliances connected in parallel in homes?}$$ a) $$\text{Less voltage.}$$ b) $$\text{Parallel doesn't heat wires.}$$ c) $$\text{Series needs high voltage.}$$ d) $$\text{Less current.}$$ $$\text{Parallel connection ensures each appliance receives full voltage, improving efficiency and independence.}$$ 39 / 50 Category: JAMB Physics 2011 39. $$\text{Two resistors } (5Ω \text{ and } 10Ω) \text{ in series then parallel to 24V. Find power ratio series:parallel.}$$ a) $$\text{3:5.}$$ b) $$\text{5:3.}$$ c) $$\text{1:50.}$$ d) $$\text{50:1.}$$ $$\text{Series: } R_{\text{total}} = 15Ω; \text{Parallel: } 1/R_{\text{total}} = 1/5 + 1/10 \Rightarrow R_{\text{total}}=10/3Ω. \text{Power ratio } P_s:P_p = (V^2/R_s):(V^2/R_p) = 3:5. $$ 40 / 50 Category: JAMB Physics 2011 40. $$\text{In electrolysis, when metal X is used, the anode and cathode arrangements include high current usage. Identify X’s role.}$$ a) $$\text{Y anode with high current.}$$ b) $$\text{X anode with high current.}$$ c) $$\text{X cathode and Y anode.}$$ d) $$\text{Y cathode and X anode.}$$ $$\text{Metal X acts as the cathode, while Y serves as the anode in electrolysis. The high current is crucial for the reaction’s progression.}$$ 41 / 50 Category: JAMB Physics 2011 41. $$\text{Radioactive isotope decay constant = } 10^{-5} \text{ s}^{-1}. \text{Find its half-life.}$$ a) $$6.93 \times 10^4 \text{ s.}$$ b) $$6.93 \times 10^{-6} \text{ s.}$$ c) $$6.93 \times 10^{-5} \text{ s.}$$ d) $$6.93 \times 10^5 \text{ s.}$$ $$\text{Half-life } T_{1/2} = \ln(2) / \lambda = 0.693 / 10^{-5} = 6.93 \times 10^4 \text{ s.}$$ 42 / 50 Category: JAMB Physics 2011 42. $$\text{Properties of steel include?}$$ a) $$\text{Easily magnetized/demagnetized.}$$ b) $$\text{Cannot retain magnetism.}$$ c) $$\text{Used for temporary magnets.}$$ d) $$\text{Ideal for permanent magnets.}$$ $$\text{Steel is ideal for making permanent magnets due to its ability to retain magnetism longer than iron.}$$ 43 / 50 Category: JAMB Physics 2011 43. $$\text{Threshold frequency } f_0 = 1.3 \times 10^{15} \text{ Hz. Work function? (h = 6.6 \times 10^{-34} \text{ Js})}$$ a) $$8.85 \times 10^{-18} \text{ J.}$$ b) $$8.58 \times 10^{-19} \text{ J.}$$ c) $$8.58 \times 10^{-15} \text{ J.}$$ d) $$8.58 \times 10^{-17} \text{ J.}$$ $$\text{Work function } \phi = hf_0 = (6.6 \times 10^{-34}) \times (1.3 \times 10^{15}) = 8.58 \times 10^{-19} \text{ J.}$$ 44 / 50 Category: JAMB Physics 2011 44. $$\text{In an AC circuit, what is the ratio of RMS current to peak current?}$$ a) $$1/\sqrt{2}. $$ b) $$\sqrt{2}. $$ c) $$2. $$ d) $$1/2. $$ $$\text{The RMS value is } I_{\text{rms}} = I_{\text{peak}} / \sqrt{2}. \text{ Thus, the ratio is } 1/\sqrt{2}. $$ 45 / 50 Category: JAMB Physics 2011 45. $$\text{Inductors of 4H and 8H in series with 10A current. Find stored energy.}$$ a) $$250 \text{ J.}$$ b) $$500 \text{ J.}$$ c) $$50 \text{ J.}$$ d) $$133 \text{ J.}$$ $$\text{Energy stored } E = \frac{1}{2} L I^2. \text{ Total } L = 4 + 8 = 12 \text{ H. Energy } E = \frac{1}{2} \times 12 \times 10^2 = 600 \text{ J.}$$ 46 / 50 Category: JAMB Physics 2011 46. $$\text{Conditions under which gases conduct electricity.}$$ a) $$\text{High pressure, high p.d.}$$ b) $$\text{Low pressure, low p.d.}$$ c) $$\text{Low pressure, high p.d.}$$ d) $$\text{High pressure, low p.d.}$$ $$\text{Gases conduct electricity efficiently under low pressure and high potential difference.}$$ 47 / 50 Category: JAMB Physics 2011 47. $$\text{Instrument used to measure high-frequency AC.}$$ a) $$\text{Hot wire ammeter.}$$ b) $$\text{DC ammeter.}$$ c) $$\text{Moving coil ammeter.}$$ d) $$\text{Moving iron ammeter.}$$ $$\text{A hot wire ammeter is designed specifically to measure high-frequency alternating currents.}$$ 48 / 50 Category: JAMB Physics 2011 48. $$\text{Bond between silicon and germanium.}$$ a) $$\text{Electrovalent.}$$ b) $$\text{Covalent.}$$ c) $$\text{Ionic.}$$ d) $$\text{Dative.}$$ $$\text{The bond between silicon and germanium is covalent as both are semiconductors sharing electrons.}$$ 49 / 50 Category: JAMB Physics 2011 49. $$\text{Which materials increase resistance with temperature?}$$ a) $$\text{Electrolyte.}$$ b) $$\text{Water.}$$ c) $$\text{Metals.}$$ d) $$\text{Wood.}$$ $$\text{Metals experience increased resistance with a rise in temperature due to increased ion-electron collision.}$$ 50 / 50 Category: JAMB Physics 2011 50. $$\text{Adding impurities to germanium to alter its electrical properties is called?}$$ a) $$\text{Doping.}$$ b) $$\text{Saturation.}$$ c) $$\text{Bonding.}$$ d) $$\text{Amplification.}$$ $$\text{The process of adding impurities to semiconductors like germanium to modify their properties is known as doping.}$$ Your score is The average score is 0% LinkedIn Facebook Twitter VKontakte 0% Restart quiz Anonymous feedback Send feedback
