GYSS 4E Prelim Physics P1 Question

2 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 shows several physical quantities. length, acceleration, density, speed, velocity, time, mass How many base quantities and vector 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

3 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

4 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

5 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 greater C same greater D greater same air piston cylinder gas molecules

6 13 The diagram shows a 4 N non-uniform metre rule suspended freely by a string at 45 cm mark. Two weights are hanging on the metre rule to keep it horizontal. Which marking would indicate the position of centre of gravity of the metre rule? A 2.5 cm B 27.5 cm C 42.5 cm D 72.5 cm 14 The change in the gravitational potential store (Ep) and kinetic store (Ek) possessed by an object was recorded and the results are shown. Which of the following correctly identifies the object? I A book falling off the table. II A ball rolling across the floor. III A ball that has been kicked upwards. IV A car driving uphill at a constant speed. A I only B III only C III and IV only D II, III and IV only 45.0 cm 85.0 cm 15.0 cm 5 N 1 N amount of energy /J time / s Ep Ek

7 15 An escalator carries 20 passengers of average mass of 60 kg. It travels 4.2 m in height in one minute for each floor. What is the minimum power of the escalator for its operation to lift these passengers from the first floor to the third floor? A 252 W B 840 W C 5040 W D 50 400 W 16 Pollen grains are placed in a transparent illuminated box and water is added. The pollen grains are seen to move randomly on the surface of the water when viewed with a microscope. What is the cause of the random motion of the pollen grains? A The pollen grains absorb light and this increase their kinetic store. B The pollen grains are moving randomly because they have internal store. C The pollen grains are moving randomly because they collide with the water molecules. D The pollen grains are moving due to convection currents caused by the water being heated by the light. 17 The diagram shows a beaker of water placed near a burning candle. How does energy transfer from the candle to the water in the beaker? A convection and conduction B convection and radiation C radiation and conduction D radiation, conduction and convection burning candle beaker water

8 18 The diagram shows a graph of temperature against time when 0.50 kg of solid is being heated. If energy is supplied to the solid at a constant rate of 175 W, what is the specific latent heat of fusion of the solid? A 5.3 × 103 J/kg B 7.0 × 104 J/kg C 2.1 × 105 J/kg D 2.8 × 105 J/kg 19 The diagram shows a water wave in a ripple tank. The wave has a speed of 16 cm/s at R. The water waves crosses a boundary PQ where the distance between crests changes from 4.0 cm to 2.5 cm. What is the velocity of the wave at point S? A 6.4 cm/s B 10 cm/s C 16 cm/s D 40 cm/s temperature / °C time / s 0 20 60 200 800 R S P Q

9 20 The graph shows the I–V characteristic for a semiconductor diode. Which statement can be deduced from the graph? A Above a certain positive potential difference the diode obeys Ohm’s law. B Current is directly proportional to potential difference when the current in the diode is in one direction. C The diode has zero resistance when the current in the diode is in one direction. D The resistance of the diode depends upon the potential difference across it. 21 The diagram shows a light ray passing from air to glass. What is the critical angle of the glass? A 34.5 o B 36.5 o C 49.4 o D 57.9 o air glass 52 o 68.5 o

10 22 Sound contain energy in different frequency ranges. Different animals can hear different frequency ranges of sound. The table shows information about some animals. animal frequent range / Hz bird 250 – 21 000 dolphin 50 – 300 000 elephant 5 – 10 000 mouse 1 000 – 100 000 How many of the animals can detect ultrasound? A 1 B 2 C 3 D 4 23 Part of the electromagnetic spectrum is shown. radio wave microwaves P visible light What is a possible application of P? A cancer treatment B intruder alarm C radar communication D sterilisation of medical equipment 24 Blocks of silver are made by pouring hot, liquefied silver into moulds. The silver cools to its melting point and begins to solidify. What happens to its temperature and its internal energy as it solidifies? A Its temperature drops and its internal energy decreases. B Its temperature drops and its internal energy remains unchanged. C Its temperature remains constant and its internal energy remains unchanged. D Its temperature remains constant and its internal energy decreases.

11 25 The circuit diagram shows a 2.0 Ω resistor connected in series with a parallel arrangement of a 1.0 Ω resistor and a 2.5 Ω resistor. The currents in the two parallel resistors are shown. What is the reading on the voltmet