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Question 4 The planet Venus can very occasionally be observed to cross the face of the Sun. These transits of Venus occur 8 years apart followed by a gap of 110 years (approximately). These are rare events because A. often an observer on Earth is facing away from the Sun ' B. the rotation of the Sun makes observation difcult C. the periods of orbit of the Earth and Venus are very similar so they rarely line up " D. the planes of the orbits are parallel but Venus orbits higher up E. the plane ofVenus' orbit is not the same plane as the Earth's orbit Question 5 When a car is approaching you and is about 30 m away, what is its approximate angular width subtended at your eye? A. 0.010 ' 3.0.050 c.o.2 D.1 E. 4 Question 7 An object of mass 24 kg lies on a smooth horizontal surface. Two light wires at right angles to each other are attached to the object and tensions of 40 N and 40 N are exerted on the object through the wires. The magnitude of the acceleration is A. 0.0 m s2 ' B. 1.7 m 5'2 ' C. 2.4 m 3'2 7' D. 3.3 m 5'2 ' E. 4.7 m 3'2 Question 8 A lift travels with a downward acceleration of 5.8 m 5'2. Take g = 9.8 m s'2 for this question. A ball held 2 m above the floor of the lift is released. The time taken for the ball to reach the oor of the lift is A. 15 B.s C.s D.s E.s NUDE? Question 10 The circuit contains two 6 V cells of negligible internal resistance, connected to two 15 resistors and an ammeter. Which of the following gives the correct reading on the ammeter? 6V 6V 159 159 A. 0.0A ' B.0.4A ' C.0.8A ' D. 2.5A E. 5.0A Question 11 The resistance in ohms of a 100 W, 240 V light bulb at its operating temperature is A. 2.40 x B. 41.7 \\ C100 \\ D. 576 \\ E. 2300 Question 12 An object of mass 2 kg moves in a straight line with a speed of 12 m 5'1. It collides with a stationary object of mass Mand sticks to it. The combined object now moves with a speed of 3 m 5'1. What is the value of M? A.2kg " B.3kg 'C.4kg " D.5kg 'E.6kg Question 14 A small object of mass m is thrown vertically upwards through the air. It experiences a drag force, kv, proportional to its speed v. kis a constant. It rises, reaches its maximum height and then falls. Its accelerations on the way up and on the way down are Acceleration on the way_up Acceleration on the wag/M A. Less than 9.8 m s2 Greater than 9.8 m 5'2 B. Less than 9.8 m 5'2 Less than 9.8 m 5'2 C. Equal to 9.8 m 5'2 Less than 9.8 m 5'2 D. Greater than 9.8 m s2 Greater than 9.8 m 5'2 E. Greater than 9.8 m 5'2 Less than 9.8 m 5'2 WPDPJ?' Question 15 A motor is able to lift a 5.6 kg block through a vertical height of 16 m with an efciency of 80%. The current is 3.0 A and the voltage of the motor is 12.0 V. How long does it take to lift the block? A. 2.05 B. 2.55 c.205 D. 30s E.1o3s Question 16 A large metal sphere of radius 15 cm is supported on an insulating pillar. It is charged with a charge density of 40 pC m'Z. The sphere is connected through a large value resistor Rto earth. The charge leaks away slowly and reduces exponentially, mathematically like in the radioactive decay of an isotope. The charge density falls to 20 pC m'2 in 30 seconds. How long from the start does it take for the charge density to reduce to 5 pC m'Z? A.455 \\B.605 'c.905 'o.120s ' E.210s Question 17 In a conducting wire of varying cross sectional area, a current [flows The diameter of the wire at B is half the diameter at A. An incorrect statement relating to this example is that A. the total rate of flow of charge through A is equal to that through B B. the number of charge carriers per unit volume at A is four times that at B ' C. the drift speed of the electrons at A is one quarter of that at B D. the resistance per unit length of wire at A is one quarter of that at B \\ E. the potential difference across unit length of wire at B is four times that at A Question 18 Waves of frequency 250 Hz travel in air at a speed of 50 m 5'1. Two points separated by 5 cm along the line of propagation of the waves will oscillate with a phase difference of A. zero radians I " B. 11/4 radians \\ C. 11/2 radians D. 311/4 radians \\ E. 11 radians