Physics Past Paper PDF

# PHYSICS ## Multiple Choice Questions 1. Which of the following is an electrolyte? - A. paraffin - B. sugar solution - C. grape juice - D. Alcohol 2. The angular dispersion of a prism depends on - A. the index of refraction only - B. the angle of incidence as well as the index...

# PHYSICS ## Multiple Choice Questions 1. Which of the following is an electrolyte? - A. paraffin - B. sugar solution - C. grape juice - D. Alcohol 2. The angular dispersion of a prism depends on - A. the index of refraction only - B. the angle of incidence as well as the index of refraction - C. the angle of incidence only - D. the thickness of the prism 3. Which of the following methods CANNOT be used to produce a steel magnet? The - A. passing of an electric current through a solenoid - B. repeated stroking of the specimen with a magnet - C. repeated stroking of the specimen in opposite directions with two magnets - D. heating the specimen 4. For the correction of myopic defects in the human eye we require - A. a convex lens - B. a concave lens - C. a combination of concave and convex lenses - D. a prism 5. To determine the weight of an object you could - A. use a beam balance - B. use a spring balance - C. find the force necessary to give it a certain acceleration - D. use none of these methods 6. Which of the following phenomenon CANNOT be explained by the molecular theory of matter? - A. Expansion - B. Conduction - C. Convection - D. Radiation 7. A cell gives a current of 0.15A through a resistance of 8 Ohms and 0.3A. When the resistance is changed to 3 Ohms the internal resistance of the cell is - A. 0.05 Ohms - B. 1.00 Ohms - C. 1.50 Ohms - D. 2.00 Ohms 8. The following are some units: - I. NS - II. NM - III. Nm⁻² - IV. JK⁻¹ - V. Jkg⁻¹ What are the units of latent heat? - A. I - B. II - C. III - D. V 9. The internationally agreed system of units (SI) for physical measurements is - A. lb, ft, sec - B. g, m, sec - C. kg, m, sec - D. cm, g, sec 10. A convex mirror is used as a driver mirror because - I. its image is erect - II. it has large field of view - III. it has along focal length 11. The heat from the sun reaches the earth by the process of - A. insulation - B. precipitation - C. conduction - D. radiation 12. If Abuja Electricity Distribution Company charges 5k per kWh, what is the cost of operating for 24 hours a lamp requiring 1A on a 200V line? - A. 24k - B. 55k - C. 40k - D. 26k 13. The force required to make an object of mass m travelling with velocity v, turn in a circle of radius r is - A. mv²/r - B. mr²/v - C. mr/v - D. mv/r² 14. An object 1cm high is placed on the axis 15cm from a converging lens forms an image 30cm from the lens. The size of the image is - A. 0.5cm - B. 2cm - C. 3cm - D. 2.5cm 15. The density of a solid is defined as the - A. mass of the solid compared to the mass of an equal volume of water - B. amount of water displaced when a unit mass of the solid is immersed in it - C. weight per unit volume of the solid - D. mass per unit volume of the solid 16. A herdsman yelling out to a fellow herdsman heard his voice reflected by a cliff 4s later. What is the velocity of sound in air if the cliff is 600m away? - A. 170m/s - B. 136m/s - C. 340m/s - D. 2.5m/s 17. The electric from Egbin Power Station is transmitted at high voltages of the order of hundreds of kilovolts but is converted to domestic use of about 220 volts by - A. transformers - B. transistors - C. valves and diodes - D. rectifiers 18. In a reverse biased junction diode, current flows in by - A. positive holes alone - B. majority carriers - C. electrons alone - D. minority carriers 19. Two boys are communicating with each other by stretching a string passing through a hole punched in the bottom of each of two tin cans. The physical principle employed is that sound travels - A. mainly through air - B. fainter in stretched string - C. faster through gases than in solids and liquids - D. with greater ease through a string than in air 20. The latent heat of fusion of ice is 80 cal g⁻¹. How much heat is required to change 10g of ice at 0°C into water at the same temperature? - A. 80 cal - B. 10 cal - C. 8 cal - D. 800 cal 21. An air force jet flying with a speed of 335ms⁻¹ went past an antiaircraft gun. How far is the aircraft 5s later when the gun was fired? - A. 838m - B. 3350m - C. 670m - D. 1675m 22. The visible part of light consists of the following colours: - A. red, indigo, infra-red, violet, yellow, green and blue - B. red, green, blue, violet, indigo, orange, and yellow - C. blue, ultra-violet, infra-red, red, yellow, indigo, violet, green and orange - D. infra-red and ultra-violet 23. A palm fruit dropped to the ground from the top of a tree 45m tall. How long does it take to reach the ground? (Given that g=10ms⁻²) - A. 9s - B. 4.5s - C. 6s - D. 3s 24. The amount of heat required to raise the temperature of a body is - A. thermal energy - B. thermal conduction - C. heat lost - D. specific heat capacity 25. Three 5 ohm resistors connected in parallel have a potential difference of 60V applied across the combination. The current in each resistor is - A. 4A - B. 36A - C. 12A - D. 24A 26. Two lamps rated 40W and 220V each are connected in series. The total power dissipated in both lamp is - A. 10 W - B. 20W - C. 40W - D. none of the above 27. A radio isotope had a decay constant of 10⁻⁷s⁻¹. The average life of the radio isotope is - A. 1.00 x10⁷s - B. 6.93 x 10⁸s - C. 1.00 x 10⁻⁷s - D. 6.93 x 10⁻⁷s 28. A few grains of table salt were put in a cup of cold water kept at constant temperature and left undisturbed. Eventually all the water tasted salty. This action is due to - A. convection - B. osmosis - C. capillarity - D. diffusion 29. A metal block of mass 5kg lies on a rough horizontal platform. If a horizontal force of 8N applied to the block through its centre of mass just slides the block on the platform, then the coefficient of limiting friction between the block and the platform is - A. 0.16 - B. 0.63 - C. 0.80 - D. 1.60 30. A potential difference of 6V is used to produce a current of 5A for 200s through a heating coil. The beat produced is - A. 4800 cal - B. 6000 cal - C. 2400J - D. 240 kcal 31. Two resistors R₁ and R₂ are connected in parallel, R₂ being greater than R₁. The combined resistance is - A. less than R₁ - B. greater than R₂ - C. the sum of R₁ and R₂ - D. the difference of R₂ and R₁ 32. Two masses 40g and 60g respectively are attached firmly to the ends of a light metre rule. The centre of gravity of the system is - A. at the mid-point of the metre rule - B. 40cm from the lighter mass - C. 40cm from the heavier mass - D. 60cm from the heavier mass 33. A charge of one coulomb liberates 0.0033g of copper in an electrolytic process. How long will it take a current of 2A to liberate 1.98g of copper in such a process? - A. 5 minutes - B. 30 minutes - C. 50 minutes - D. 60 minutes 34. A temperature of 20°C is the same as - A. 36°F - B. 68°F - C. 43.1°F - D. 11.10F 35. Which of the following is NOT a force - A. Friction - B. Tension - C. Up thrust - D. Impulse 36. An electric kettle connected to a 240V mains, produces 6.0 x 10⁵J of heat energy to boil a quantity of water in 5 minutes. Find the resistance of the kettle - A. 14.4 Ohms - B. 28.8 Ohms - C. 144 Ohms - D. 288 Ohms 37. A magnet is moved through a coil of wire. The e.m.f produced in the wire depends on - A. the number of turns in the coil - B. the strength of the magnet - C. the speed at which the magnet is moved - D. all of the above 38. Electrical appliances in homes are normally earthed so that - A. the appliances are maintained at a lower p.d. than the earth - B. both a.c. and d.c sources can be used - C. a person touching the appliances is safe from electric shock - D. the appliances are maintained at a higher p.d than the earth 39. In a gass experiment, the pressure of the gas is plotted against the reciprocal of the volume of the gas at a constant temperature. The unit of the slope of the resulting curve is - A. force - B. force/m - C. work - D. force/m² 40. Water shows anomalous behaviour - A. below 0°C - B. between 0°C and 4°C - C. at exactly 4°C - D. between 4°C and 100°C