# IGCSE Grade 9 Physics- Important Questions

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In this article, we are providing you important IGCSE Grade 9 Physics questions. Answering these questions would require thorough knowledge of basic Physics concepts. You should be knowing answers and concepts behind these questions in order to perform well in this class. Since Physics is the foundation of a career in many fields like engineering, computer, medical etc, you should be well versed with it.

## IGCSE Grade 9 Physics- Important Questions

1. (a) A student changes the current in a filament lamp. She measures the current and the potential difference (p.d.) across the lamp.

Fig. 1.1 is an incomplete circuit diagram

Fig. 1.1

(i) On Fig. 1.1, complete the unfinished circuit symbols.

(ii) One pair of readings for the lamp is shown in the table

Calculate the resistance of the filament in the lamp for these readings.

resistance of filament = ……………………………………………….Ω [3]

(iii) After many hours of use, the filament wire in a lamp becomes thinner. State the effect, if any, on the resistance of the lamp.

(b)(i) Complete the circuit in Fig. 1.2 to show a battery connected to three lamps arranged in parallel.

Fig. 1.2

(ii) Describe two advantages of connecting these lamps in parallel with the battery. …………………………………………………………………………………………………………………………. ………………………………………………………………………………………………………………………[2]

2. Three types of ionising radiation are alpha, beta and gamma.

(a) Draw one straight line from each type of radiation to a property of that radiation.

(b) Polonium-210 has the nuclide notation 210 84 Po.

For one neutral atom of polonium-210,

(i) determine the number of protons, ………………………………………………[1]

(ii) determine the number of neutrons. …………………………………………….[1]

(c) Fig. 2.1 shows a decay curve for polonium-210.

Fig. 2.1

Use the graph to determine the half-life of polonium-210.

half-life = ……………………………………….. weeks [2]

3. A student uses a bar magnet to distinguish between an unlabelled magnet and an iron bar.

(a) Describe how the student identifies which is the magnet and which is the iron bar. ……………………………………………………………………………………………….. ……………………………………………………………………………………………….. ……………………………………………………………………………………………….      [2] (b) The student suspends the iron bar near to a coil, as shown in Fig. 3.1. The iron bar is free to move.

Fig. 3.1

Describe and explain what happens when the switch S is closed. …………………………………………………………………………………………………….. ……………………………………………………………………………………………………..

(c) Fig. 3.2 shows a wire passing through a piece of card.

Fig. 3.2

There is a current in the wire in the direction of the arrow.

On Fig. 3.3, draw the pattern of the magnetic field lines due to the current in the wire. Include the direction of the field.

Fig. 3.3

4. Fig. 4.1 shows a room with a heater

Fig. 4.1

(a) The temperature in the room is hottest near to the ceiling. Explain why. ……………………………………………………………………………………………………………………………………………………………………………………………………………..[2]

(b) The ceiling of the room is made from an insulating material as shown in Fig. 4.2.

Fig. 4.2

Explain how this reduces the transfer of thermal energy through the ceiling. ………………………………………………………………………………………………………. ……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………                        [4]

5. Waves from different regions of the electromagnetic spectrum have different uses. (a) Draw one line from each type of electromagnetic wave to its use.

(b) Many years ago, some shoe shops used X-ray machines to make images of feet, as shown in Fig. 5.1.

Fig.5.1

Explain the risk to health of using these X-ray machines. ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………..[2]

6. (a) Some students want to determine the speed of sound in air. Describe a method they could use. Include the measurements they must make. ……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………..[4]

(b) The graph in Fig. 6.1 represents a sound wave.

Fig. 6.1

(i) Which distance represents the amplitude of the wave? Circle your answer.     [1]

AC AF BE DE CF

(ii) Which distance represents the wavelength of the wave? Circle your answer. [1] AC AF BE DE CF

(iii) Another sound wave, of the same wavelength, is louder.

On Fig. 8.1, draw this wave.                                                                        [2]

7. Fig. 7.1 shows a wave-powered generator. It generates electricity from the movement of sea waves

Fig. 7.1

(a) The sentences below describe how the wave-powered generator works.

A. Air is pushed through the turbine, making it spin.

B. Water rises and falls in the chamber.

C. The turbine turns a generator.

D. The generator produces electrical energy.

E. Waves travel towards the chamber.

Write letters in the boxes below to arrange the sentences in the correct order. The first one is done for you.

(b) More electricity needs to be generated from renewable sources instead of from burning fossil fuels. State three benefits of generating electricity from renewable sources rather than from fossil fuels. ………………………………………………………………………………………………………. ……………………………………………………………………………………………………………………………..[3]

8. Fig. 8.1 shows a see-saw. The see-saw is horizontal when not in use

Fig.8.1

A small child sits on one seat of the see-saw. This creates a turning effect about point P. (a) Which of these words means the turning effect of a force? Tick one box

(b) State the scientific name for point P. ……………………………………………………………………………………………………………………………..[1]

(c) A much heavier boy sits on the other end of the see-saw, as shown in Fig. 8.2

Fig.8.2

The heavier boy moves slowly along the see-saw from end B until he reaches point P. Describe and explain what happens to the see-saw. ……………………………………………………………………………………………………………………………..[4]

9. (a) Fig. 9.1 shows a plane mirror reflecting a ray of ligh

Fig.9.1

(i) There is a dashed line drawn at right angles to the mirror.

State the name of this line. ………………………………………………………………………………………………………………………[1]

(ii) State which angle, w, x, y, or z, is the angle of reflection. ………………………………………………………………………………………………………………………[1]

(b) Fig. 9.2 shows a ray of white light entering a semi-circular glass block. The ray of light emerges at point R and travels alongside the flat surface.

Fig.9.2

A spectrum of colours can be seen on the screen between S and T.

(i) State the colours in the correct order. One has been done for you.

colour at S is RED

…………………….

…………………….

…………………….

…………………….

…………………….

colour at T …………………….

(ii) The angle of the ray is changed.

On Fig. 9.3, complete the path of the ray of light. Explain your answer.

Fig.9.3

………………………………………………………………………………………………………………………[3]

10 Fig. 10.1 shows a balloon near a window on a warm sunny day.

Fig.10.1

Fig. 10.2 shows how the volume of the balloon changes throughout the day.

Fig.10.2

(a) Describe how the volume changes throughout the day. ……………………………………………………………………………………………………………………………..[1]

(b) Explain, in terms of the gas molecules inside the balloon, why the volume changes in this way between 10:00 and 14:00. ……………………………………………………………………………………………………………………………………………………………………………………………………………………………………….[3]

11. Three students walk together from school to a bridge. The students stand together on the bridge for three minutes and then return separately to school.

The distance-time graphs for student A, student B and student C are shown in Fig. 11.1.

Fig.11.1

(a) (i) Determine the distance from the school to the bridge. distance = ……………………………………………… m                                                         [1]

(ii) Calculate the average speed of the students when they are walking to the bridge. Give your answer in m / s.

average speed = ……………………………………………m / s                                [4]

(b) The students return to school at different speeds. One student walks slowly, one student walks quickly and the other student runs. State which student runs. Explain how this is shown by the graph.

student ………………..

explanation …………………….[2]

12. A student is investigating volume and density. The student has a box, as shown in Fig. 12.1, a balance, a rule and some dry sand.

(a) Fig. 12.1 shows the dimensions of the inside of the box.

Fig.12.1

Calculate the volume of sand needed to fill the box

volume of sand = …………………………………………… cm3 [1]

(b) The student measures the mass of the box when empty and when filled with sand.

Calculate the mass of the sand in the box, using her results.

mass of sand = ………………………………………………. g [1]

(c) Calculate the density of the sand.

density of sand = ……………………………………….. g / cm3                          [3]

(d) A miner has a bag containing a mixture of gold dust and sand. Gold has a density of 19.3 g / cm3.

He heats the mixture until the gold melts.

Predict whether the sand will float on top of the molten gold. Explain your answer. ……………………………………………………………………………………………………………………………..[2]

These questions are provided to Vagupu by Mr. CN Muralinath. Mr. Muralinath is an IIT Alumnus and best tutor for IGCSE Physics and Math. If you want answers of these questions or clarification on any other concept related to IGCSE Physics and Math, feel free to contact him. To contact Mr. Muralinath, click here