GYSS 4E Prelim Physics P1_answer

1 The approximate diameter of the earth is 13 x 106 m and the diameter of a nitrogen atom is 15 x 10-11 m. How are these values expressed with prefixes? diameter of the Earth diameter of nitrogen atom A 1.3 x 10-2 Mm 1.5 x 10-1 µm B 1.3 x 10-2 Gm 1.5 x 10-1 µm C 1.3 x 10-2 Mm 1.5 x 10-1 nm D 1.3 x 10-2 Gm 1.5 x 10-1 nm 2 The list below shows several physical quantities. length, acceleration, density, speed, velocity, time, mass How many base quantities and scalar quantities are there? base quantities vector quantities A 2 2 B 2 5 C 3 2 D 3 5 3 A pendulum makes 20 complete oscillations in 15 seconds. What is the frequency of the oscillations? A 0.75 Hz. B 1.33 Hz C 1.50 Hz D 2.67 Hz X Y

4 The displacement–time graph of a car is shown. At what time does the car make a U-turn? A at 2 s B at 4 s C at 10 s D at 16 s 5 A pulley is used to lift a mass of 5.0 kg at an acceleration of 0.20 m/s2 as shown. What is the tension in the string? A 1.0 N B 10.0 N C 50.0 N D 51.0 N 6 A car of mass 500 kg starts from rest on a level road. If the effective horizontal force from engine is 2000 N, determine the time taken for the car to reach a speed of 25 m/s? Assume that all frictional forces are negligible. A 3.13 s B 6.25 s C 20.0 s D 78.0 s a = 0.20 m/s2 5 kg 2 4 10 16 displacement/m t/s

7 Oxygen is compressed in the sealed end of a long J-tube by means of a column of mercury open to the atmosphere where atmospheric pressure is 76 cm Hg. What is the pressure of oxygen acting on the mercury? A 120 cm Hg B 125 cm Hg C 201 cm Hg D 236 cm Hg 8 Newton’s third law of motion applies to an action-reaction pair of forces. Which statement concerning the pair of forces is not correct? A The two forces are acting on the same body. B The two forces are acting on different bodies. C The two forces are always opposite in direction. D The two forces are at all times equal in magnitude. 9 Which pair of forces are contact forces? A gravitational force and air resistance B magnetic force and air resistance C normal force and friction D tension and electrostatic force 155 cm 40 cm 35 cm oxygen mercury 160 cm

10 Which of the following is a renewable source of energy? A Coal B Natural gas C Petroleum D Tidal energy 11 Which of the following objects has the highest inertia? object density / gcm-3 volume / cm3 A 6 4.6 B 9 3.6 C 14 2.6 D 18 1.6 12 Gas inside a cylinder is heated slowly to a higher temperature. The pressure inside the cylinder remains constant as the piston moves outwards. How do the speed of the gas molecules and their rate of collision with the piston compare with their initial values at the lower temperature? rate of collision speed of molecules A greater greater B reduced grea