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phy - UNIVERSITY ENTRANCE EXAMINATION PHYSICS Duration 2...

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1 UNIVERSITY ENTRANCE EXAMINATION PHYSICS Duration : 2 hours Please read the following instructions carefully. 1. This paper is made up of 50 Multiple-Choice questions and comprises ELEVEN ( 11 ) printed pages. 2. Do not write on the question paper . 3. Answer all questions and indicate your answers on the answer sheet provided. Marks will not be deducted for wrong answers. 4. Do not take any paper, including the question paper or unused answer sheets, out of the examination hall.
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2 Multiple-Choice Questions Answer all questions in this section. 1. A car accelerates uniformly from 10 to 20 ms -1 in a distance of 150m; How long after that will it reach 40 ms -1 ? A 40s . B 20s . C 45s . D 15s . E 30s . 2. A parachuter of mass 75 kg falls towards the earth at a speed of 25 ms -1 . What is the resultant force acting on the person? A 750N . B 450N . C 1,350N . D No net force . E 1,500N . 3. Light travels at different speed through different materials. If it travels at speed c 1 in a medium of refractive index 1.2, what is its speed in a medium of refractive index 1.6? A 1.3c 1 . B 0.67c 1 . C 2c 1 . D 1.7c 1 . E 0.55c 1 . 4. Speed of sound in air is 340ms -1. A shot is fired and the echo is heard 2 s after the shot was fired. How far is the reflecting surface? A 340m . B 680m . C 170m . D 85m . E 34m . 5. The oscillation of a pendulum is simple harmonic when the amplitude is small compared to its length. This is because: A a long pendulum loses less energy . B the restoring force is proportional to displacement at small angles . C friction of the pivot is smaller when the pendulum is long . D a long pendulum is more massive. E it has a higher length to mass ratio.
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3 6. A coil of wire stores energy in the form of A charge . B potential difference . C magnetic field . D A and B . E A and C . 7. The angular frequency of a wave is 2,000 π and its phase velocity is 320ms -1 . Its period is A 10 -3 s . B 5x10 -4 s . C 10 ms . D 100μs . E 0.05s . 8. A motor has both resistance and inductance. A motor rated at 1 hp input operating at 240V draws 4 A of current because A power is lost due to resistance . B magnetic saturation robs power . C inductance does not consume power . D friction in the bearings of the motor. E A and B . 9. A sinusoidal alternating current is fullwave rectified. The rectified current will produce in the same load A the same power . B 0.71 times the power . C 1.41 times the power . D half the power . E twice the power . 10. Capacitance is measured in A Farads . B Henrys . C Ohms. D Pascal . E Watts .
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4 11. Fluorescent lamps use phosphors to produce visible light from UV light. This is done by absorbing the UV light and then re-radiating it using a different wavelength. This is a A one way process . B reversible process. C process that produces continuous spectrum . D process that produces a single wavelength only . E process that is very inefficient . 12. The property of a transparent material that makes it useful as material for a lens is A refraction .
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