# O Level Physics 2016 Solved Past Paper 1

Here is the Solved Past Paper of O Level Physics Summer 2016 Paper 1. You can solve the paper online on our website.

### Solutions:

1. Use head to tail rule. Head of one vector connects with the tail of the other. The resultant runs from the tail of the first to the head of the last vector in the connected diagram. D.
2. Vectors have both, direction and magnitude. A.
3. The circumference can be found by rolling a tape around the ball. D.
4. Acceleration is the rate of change of speed and is depicted by the gradient in a speed-time graph. The gradient is zero (flat line) in the given range, hence D.
5. acceleration = force/mass. Net force = 60-20 = 40N. m=25kg. 40/25=1.6m/s^2. B.
6. Resultant force in circular motion acts towards the center of the circle. B.
7. Newton meter measures gravitational force, in Newtons. A balance, balances two masses. C.
8. Mass is the amount of space it occupies only which is unchangeable. D.
9. Sum of all moments is always 0. 60(20+30)=30w. w=100N.
10. Stability increases as the center of mass is lowered. A.
11. Gravitation potential energy is mass x gravity x height = 250 x 7 = 1750N. This energy will be used in overcoming friction. 1750-1300=450N.
12. Geothermal energy  is extracted from the Earth. Wind and Solar are also renewable. Only Nuclear energy isn’t.
13. Atoms combine in nuclear fission, which is the power source of the Sun. C.
14. Work done = force x distance = 300 x 5 = 1500J.
15. Pressure in liquids = depth x density x gravity. Density and gravity are the same, so compare depths. The depth is greatest in C.
16. P1V1 = P2V2, 6×1=3xX, X=2. A.
17. The heat will give them KE which will cause them to move faster. C.
18. Radiation is infrared which in on the electromagnetic spectrum and has the speed of light. A.
19. Wavefront is all the highest points (crest) joined together.
20. Wavelength is the distance between to troughs, or two crests. D.
21. i and r are both measured from the normal (perpendicular). C.
22. Rays incident on the lens are refracted towards the focal length. B.
23. The refractive index = sin (incidence) / sin (refraction). Using this formula, we can compute the angle of refraction is 34. A.
24. A, C and D are false. B is true. B.
25. Gamma rays are used in radiotherapy. B.
26. Loudness is proportional to amplitude and pitch is proportional to frequency. B.
27. The compass follows the field of the magnet. C.
28. The positive charge on the rod will repel the positive charges in the ball and attract the negative one’s. D.
29. Current = charge / time. Time is 240 seconds. Hence, charge = 2 x 240 = 480C. D.
30. Volt is the work done per unit charge. D.
31. The combined resistance of two resistors in parallel is least. C.
32. Resistance = voltage / current = y-axis / x-axis = gradient. The graph with the larger gradient has the larger resistance. Since resistance is inversely proportional to cross sectional area, the one with the lower resistance has the greater area. B.
33. The switch is placed on the live wire and after the fuse.
34. Since, V=IR. Select an option which gives resistance close to the given 5 Ohm. A.
35. Every half turn, the ring turns and changes the direction. B.
36. A diode let’s current pass on one direction. A is the diagram of a diode. A.
37. We need the LDR to have lowest resistance and thermistor to have highest possible resistance. That is achieved in cold and bright conditions. B.
38. Beta particle is an electron.
39. Two half lives have been spanned so we need to double the count twice. D.
40. It has 7 electrons, 7 protons and 15-7=8 neutrons. C.

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# IGCSE Physics Summer 2016 Paper 1 Solved

The IGCSE Physics Summer 2016 Paper 1  Solved has been solved and explained here. You can solve the IGCSE Physics paper online.

1. Note the reading at the end and beginning of the feather. 29-10=19mm. Answer, A.
2. Speed is distance/time. 60/20 = 3km/minute = 3000m/60seconds = 50m/s
3. Both have the same speed according to graph so A is correct. Acceleration is the gradient of the graph, Runner 1 graph has non-zero gradient, so B is false. TO check overtaking, we need to measure the area under the graph, which is distance traveled. Runner has lesser area under the graph, so C is false. Slowing down implies negative acceleration, hence negative gradient, since the gradient is positive, D is false.
4. Due to evaporation, some of the liquid is gone, so the mass and weight is less.
5. If the weight is 10N for 1kg mass, the for 50kg it will be 50×10=500N. Likewise, on the other planet, 4×50=200N. D.
6. Density=mass/volume. the volume of the liquid changes after the stone is lowered. The change is caused by the volume of the stone, hence is equal to it. Volume of Stone = Final Reading – Initial Reading. Denisty = mass/Final Reading – Initial Reading
7. A through C are quantities derived from force. Only Weight, D, is the force exerted by gravity on an object.
8. Moments = force1 x distance1 = force2 x distance2. Hence, C.
9. The difference is the dissipated energy. B.
10. Geothermal energy is heat extracted from the ground, hence coal is chemical energy. Any moving object has kinetic energy. Hence, B.
11. Power = change in energy / time. change in energy = mass x gravity x height. Since gravity and height are the same for all four, we don’t need that for our comparison. Calculate mass/time for all. 8/3, 2, 12/5, 14/3. D has largest value. Answer is D.
12. Pressure in liquids = height x density  gravity. Since all 3 are the same for the three vases, D is the answer.
13. When the atmosphere pushes on the mercury, the level on W will rise hence increasing the distance between W and Y. B is the answer.
14. When molecules leave a liquid, the take energy from the rest of the liquid to gain enough energy to take flight. This decreases the temperature of the rest. A is the answer.
15. The molecules will move more because of the heat energy, increase in movement = increase in KE.
16. It’s a gas initially. The first flat line shows, it became a liquid. After that, the liquid cooled further, hence C is the answer. It can’t be D, because the liquid will solidify when the graph flat lines again.
17. Impurities in a substance adjust the boiling and melting points. Pure water and ice should be used. D.
18. The thermal capacity dictates how much heat energy a substance can store for one degree of temperature change. C.
19. Density decreases because volume increases. Heat is ransferred in liquids and gases as convection currents.
20. C because Copper is a better conductor of heat than glass.
21. Light and X ray are on the electromagnetic spectrum, which is transverse. Sound is longitudinal.
22. Diffraction is caused by an uneven surface. The hill is uneven. A.
23. One can observe from the reflection of the ray that the focal length is 40cm. A.
24. Lowest frequency is at the top, highest frequency is at the bottom. Red has lowest and violet has highest. Yellow is in the middle.
25. Human beings can hear from 20 Hz through 20 kHz. Ultrasound is beyond 20 kHz. B.
26. Loudness is proportional to Amplitude. Pitch is proportional to frequency. D.
27. B. Plastic is neither repelled or attracted by magnets.
28. Soft Iron makes a temporary magnet. A permanent one is formed by hard steel.
29.  Volt is measured in parallel, Ampere in series. Since both devices are connected in parallel, it’s Volts. D.
30. The Rod is negative, so there has to be in influx of electrons. Which would come from the cloth, causing a majority of protons, causing a positive charge.
31. Relays, when turned on, turn on a larger circuit. A.
32. Current will complete it’s circuit by entering the battery through Z.
33. LDR increase resistance when it gets dark. PD is proportional to resistance when current is constant.
34. Live wire, because that’s where the current enters. It disconnects the circuit because the wire melts when the current exceeds 30 A.
35. The magnet gets weaker and attracts less pins.
36. The change factor is 800/40=20. The entered current will decrease by the same factor. 240/20=12V. B
37. Number of neutrons = nucleons – protons. number of protons = number of electrons. 37-17=20.
38. The number of protons is same among isotopes.
39. Both change the number of protons in the nucleons. This change is the same as having a new element.
40. Every 20 minutes, the count is halved by 2. Hence the half-life is 2mins.

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