## Physics O Level #### 1. Which of the following is a suitable device for measuring the internal diameter of a capillary tube with diameter less than 0.5 mm.Metre Rule Vernier CallipersMicrometer Screw GaugeTravelling Microscope #### 2. Which of the following comprises one vector and one scalar quantity?Force, Acceleration Speed, DisplacementDistance, MassMagnetic Field, Velocity #### 3. In the absence of air resistance, what happens to the acceleration of a ball being thrown into the air, as it rises to greater heights?Decreases Remains ConstantIncreasesZero #### 4. If the displacement time graph of a particle's movement is a straight line with gradient m (where m > 0), what can we conclude about its acceleration time graph?Straight line with positive gradient Straight line with negative gradientConstantZero #### 5. A body on a horizontal frictionless surface is acted upon by a 5 N force towards the right, and another 5 N force towards the left. Which of the following CANNOT describe the body's motion?It is stationary It is moving to the leftIt is moving to the rightIt is slowing down #### 6. A 3 N force is to be added to a 8 N force. Which of the following CANNOT be the magnitude of the resultant force?3 N 5 N8 N10 N #### 7. A box slides down a rough incline plane. Which of the following describes how energy is being conserved?Loss in K.E. = Gain in P.E. + Work Done against Friction Gain in K.E. = Loss in P.E. + Work Done against FrictionLoss in P.E. = Gain in K.E. + Work Done against FrictionGain in P.E. = Loss in K.E. + Work Done against Friction #### 8. A rod is balanced horizontally with several weights placed on it. How does its moment at the right end of the rod compare with its moment about its centre of gravity?Moment at right end is greater than at C.G. Moment at right end is less than at C.G.Moment at right end is same as at C.G.Cannot be determined without further information #### 9. The acceleration of free fall on the Moon is 1/6 that on the Earth. Two pieces of rock, A and B, have the same volume. A is placed on the Moon and B on Earth. If both of them have the same weight, what is the ratio of A's density to B's density?1 : 1 1 : 66 : 1Cannot be determined #### 10. Which of the following will cause the height of the mercury column in a barometer to rise?Bring it up the mountain Introduce some air into the barometer, in the space above the mercury columnBring it to the moon and place it out in the openPlacing it inside a manned space station in outer space #### 11. Which of the following DOES NOT result in faster speed of response of a thermometer?Using a bulb with a thinner glass Using a bore with a larger diameterUsing mercury instead of alcoholUsing a smaller bulb #### 12. Which of the following temperature is not possible?868 Degree Celsius 27 Degree Celsius-189 Degree Celsius-386 Degree Celsius #### 13. When substance A and B are both heated with the same heater, the temperature of A rises faster than that of B. What can we conclude about A and B?A has a higher specific heat capacity than B A has a lower specific heat capacity than BA has a higher heat capacity than BA has a lower heat capacity than B #### 14. The specific latent heat of vapourization of water is about 6.7 times that of the specific latent heat of fusion of water. What is the ratio of the latent heat of vapourization of 6.7 kg of water compared to the latent heat of fusion of 1 kg of water?1 : 6.7 6.7 : 11 : 4545 : 1 #### 15. The pressure of air in a container has increased. What could have been the cause of the increase?An increase in the volume of the container A decrease in the temperature of the gasAn increase in the molecules' average kinetic energyA decrease in the molecules' average speed #### 16. When water waves move from a deeper to a shallower region ...Its wavelength decreases Its wavelength increasesIts frequency decreasesIts frequency increases #### 17. A man of height 1.8 m tries to see his whole body with a mirror, from the top of his head to the tip of his toes. What is the minimum length of mirror required?1.8 m 1.5 m1.2 m0.9 m #### 18. A beam of light hits a mirror at an angle. When the mirror is rotated by 10 degrees, by what angle does the reflected beam turn?0 degrees 10 degrees20 degrees40 degrees #### 19. When light in glass strikes the glass-air interface at an angle of incidence less than the critical angle, which of the following statement is true?It is totally reflected back into the glass It totally exits the glassIt is partially reflected back into the glassIt is reflected back along its original path #### 20. A fish in a pond looks up at a man standing beside the pond. To the fish, the man appears ...Smaller and nearer than he actually is Smaller and further than he actually isLarger and nearer than he actually isLarger and further than he actually is #### 21. The distance between a compression and rarefaction in a sound wave is 0.15 m. The period of the sound wave is 0.20 milliseconds. The speed of the sound is:330 m/s 750 m/s1500 m/s3300 m/s #### 22. At the centre of a rarefaction of a sound wave in air, the pressure is 91,000 Pa. Which is the most likely pressure at the centre of a compression of the same wave?121,000 Pa 111,000 Pa101,000 Pa91,000 Pa #### 23. A metal sphere is given a positive charge. Where do all the charges reside?At the centre of the sphere Evenly spread out within the sphereAt the surface of the sphereOutside the sphere #### 24. What happens when a positively charged rod is brought near a piece of paper?The free electrons in the paper move towards the side nearer the rod The rod causes a distortion of the charge distribution in the paper's atomsThe rod causes the paper atoms to become ionizedThe rod causes a break down of air molecules between the rod and the paper #### 25. Three resistors of finite value R (where R > 0) are connected in series in a circuit. Which of the following combinations of their voltages is NOT possible?3V, 2V, 5V 0V, 3V, 5V0V, 0V, 0V2V, 2V, 2V #### 26. A voltmeter with finite resistance is used to measure the potential difference across a resistor in a circuit. The measured reading of the voltmeter is:Greater than the actual potential difference Equal to the actual potential differenceSmaller than the actual potential differenceNot possible to tell without further information #### 27. Which of the following devices' main purpose is NOT to provide safety to users of electricityEarth Leakage Circuit Breaker Miniature Circuit BreakerFuseTransformer #### 28. How can power loss be reduced in power transmission?Increase the transmitted voltage Decrease the load resistanceIncrease the transmission wire's resistanceDecrease the frequency of the transmitted current #### 29. Which of the following is NOT suitable for use as a transformer core?Iron NickelMu-MetalSteel #### 30. Which of the following actions CANNOT increase the magnetic field strength of an electromagnet with only air within its core?Increasing the current through the coils Increasing the number of turns per unit lengthInserting a piece of soft iron into the coilsIncreasing the diameter of the coils #### 31. A vertical wire carries a current from the floor to the ceiling. To which side of the wire is it possible for the resultant magnetic fied to be zero?To its North To its SouthTo its EastTo its West #### 32. A loop of wire rotates in a magnetic field. Which of the following actions causes an increase in the e.m.f. generated by the coil?Rotating at a slower speed Increasing the number of turnsReducing the area of the coilUsing a weaker magnet #### 33. Which of the following is the most important word in Lenz's Law?Flow ChangeRateOppose #### 34. When both inputs of a NAND gate are joined together into a single input, what gate does it become?NOT NORORAND #### 35. A radioactive source emitting only alpha-particles is placed on a table, with a Geiger-Muller tube pointing at it. The G-M tube records 500 counts per minute. When a 2-cm thick lead plate is placed between the radioactive source and a Geiger-Muller tube, what count rate is to be expected?500 per minute 100 per minute20 per minute0 per minute #### 36. Which of the following affects the activity level of a radioactive source?Increasing the pressure of the surrounding Increasing the temperature of the surroundingImmersing the source in concentrated acidNone of the above #### 37. A radioactive source has a half-life of 24 hours. At 1:00 am, it has an activity 1000 counts per minute. At 1:00 pm on the same day, what is its most likely activity?900 counts per minute 800 counts per minute700 counts per minute600 counts per minute #### 38. Which of the following is not a conclusion of Geiger and Marsden's Alpha Scattering Experiment?The nucleus is small The nucleus is massiveThe nucleus is stableThe nucleus is positive #### 39. Which of the following is a reactant in nuclear fission and a product in nuclear fusion?Deuteron UraniumNeutronHelium #### 40. Einstein's equation E = mc-squared illustrates the:Law of Conservation of Mass Law of Conservation of EnergyLaw of Conservation of Mass-EnergyLaw of Conservation of Momentum

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