# IGCSE Physics Winter 2015 Solved Past Paper

IGCSE Physics Winter 2015 past paper has been solved below.

1. With a rule, one can measure the dimensions to calculate volume and a beaker can measure volume directly.
2. Distance traveled in a a speed time graph is the area under the graph, which in this case is, 100m. A
3. Average speed is total distance / total time. 30km / 0.5 hour = 60km/hr. D.
4. Mass is the amount of space an object occupies. The mass will remain the same, only the weight will change because it depends on gravity, which is different among planets.
5. Density is mass / volume, hence, D.
6. Since it’s not moving, the turning effect and resultant forces are both zero.
7. Mass cannot be changed by force. C is the only option without mass. C.
8. Work Done = Force x Distance. B.
9. The fuel reacts in the boiled to turn a turbine which turns the generator. D.
10. The difference C is used.
11. Pressure is force/area. It is Least in B.
12. The decrease in temperature makes the molecules of the gas less ‘excited’. This decreases the kinetic energy. The decrease in kinetic energy corresponds to a decrease in volume, hence pressure. A.
13. The water evaporates by absorbing the heat from her body which makes her cold. D.
14. It’s density decreases because it’s volume increases. A.
15. Thermal capacity correlates to the change in temperature for 1 Joule of energy supplied. A.
16. The air gains heat energy and expands. An increase in volume causes the density to decrease. C.
17. The best conductor would take the least amount of time. B.
18. A wave with high and low points is transverse. The wavelength is the distance between to points of same altitude.
19. Diffraction is uneven reflection. A.
20. The order is in terms of wavelength and frequency. Infrared waves are adjacent to visible light and farther away from gamma waves than radio waves.
21. Ray Y should be perpendicular to the lens. Only X and Z are correctly drawn. B.
22. D.
23. Sound need a medium and light doesn’t. B.
24. Human beings can’t hear sounds below 20Hz and above 20kHz. B.
25. Ferrous means containing iron. D.
26. An alternation current can demagnetize a steel bar.
27. Power is Joule peer unit time, which is equivalent to Watt. D.
28. Resistance in inversely proportional to square of area, and proportional to length of wire. C.
29. R = V/I. The value of R computer using this formula is the same except in B. B.
30. B.
31. Current in a series circuit is same everywhere. B.
32. Light will decrease the resistance of the LDR. Since voltage is proportional to resistance in parallel, it will also decrease.
33. The brightness will be normal because resistance will be least in B, because it is a parallel circuit.
34. Energy loss is minimized at high voltages. D.
35. C.
36. Increasing the number of turns will increase the flux which will increase the turning effect. A.
37. Opposites attract, hence, C.
38. An alpha particle is a Helium nucleus. It’s emission will decrease the proton number by 2. A.
39. The half life should decrease the radiation by half. If it greater then there is background radiation present. C.
40. The subscript is the electron number. B.

# 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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# To do, and how to!

I hereby solemnly acknowledge that I have never been a brilliant student, and probably never adored by my teachers (though the feeling has been mutual). And I stand here (metaphorically) with the audacity to advice all of you who are hopefully brighter than I am. So why should you heed my words? Because a procrastinator can come up with the best short cuts possible.

To start with, understand that all the subjects require very little: logical thinking and a tad bit of hard work (take Physics for example’s sake). The former is probably the least popular, even more when one has been blessed with teachers who teach nothing but abstract concepts transferring their own superfluous understanding to their students. Now, this may seem like a rant of a student who abhors the existence of a subject (and it is half-true). Honestly, it is a rant but of a student who finds the subject’s existence fundamental to understanding from the infinitesimally small particle to the most grandiose of structures and all that lies in the space between. So ending with the digression, how does one (who might have a weak understanding of the subject) get an A in CIE?

Remember that the syllabus is carefully planned out such that if spread throughout the year can be covered comfortably. So I have two advices for the two different sects of students:

1)      For those who find “understanding” concepts essential: Read and Question! It is as simple as that. There is ample time to do the past papers at the end of the academic year. However, it is important to understand how and what one might get questioned on. Otherwise, you will just keep reading without getting prepared.

2)      My teacher says this quite frequently, “CIE’s are all about the money. Money, money, …., money. You give the money, you get the grade.”

And this is undeniably true. Cambridge being a business would want to give you a good grade, unless you work hard to prove that your evolution had intermediary faults. So, there is hope for us! This is my sect, the sect of procrastinating “cool” students. My advice to you: Solve past papers, baby! You can probably learn enough, not by the concepts but from the answers of the Marking Scheme to get an A. Hard work is for nerds anyways, we are too brilliant for it ( Sect 1, hope you are not offended).

Well that ends it. Have fun, enjoy, and study (yeah that too)! Kudos.