Sept F5

SMK CHERAS PERDANA KERJA RUMAH TERANCANG FIZIK TINGKATAN 5 (SEPTEMBER 2015)

NAME:

CLASS:

1. Diagram 1.1 shows a computer battery charger connected to a 240 Va.c. power supply. The battery charger contains box X and box Y.

Diagram 1.1 (a) The function of the component in box X is to lower the voltage from 240 V a.c to 20 V a.c. (i) Name the component in box X. ___________________________________________________________________________________ [1 mark] (ii) Explain why a.c and not d.c is supplied in Diagram 4.1. __________________________________________________________________________________ __________________________________________________________________________________[1 mark] (iii) State the physics concept which explains how the component in box X works. ___________________________________________________________________________________[1 mark] (b) The efficiency of the component in box X is 80%.Calculate the input current when the output power is 65 W.

[2 marks] (c) Box Y contains four identified components to change a.c to d.c. On Diagram 1.2, draw the electronic components in the coloured circles provided.

Diagram 1.2

2. Diagram 2.1 and Diagram 2.2 show two photographs of electrical circuits.

Diagram 2.1

Diagram 2.2

(a) Which diagram shows a parallel circuit? _______________________________________________________________________________ [1 mark] (b) Draw an electrical circuit diagram for the photograph in Diagram 2.1.

[2 marks] (c) Diagram 2.3 shows an electrical circuit. Assume that the internal resistance of the battery is negligible.

Diagram 2.3 (i) Calculate the effective resistance of the circuit.

(ii) What is the reading of the ammeter?

[2 marks]

[1 mark] (iii) One of the 10 Ω resistors is removed from the circuit. What happens to the ammeter reading? _______________________________________________________________________________ [1 mark]

3. A pencil is placed in front of a concave mirror. Diagram 3.1 shows the image of the pencil in the mirror.

Diagram 3.1 (a) Name the phenomenon involved in the formation of the image. ___________________________________________________________________[1 mark] (b) The image is upright and magnified. State one other characteristic of the image. ___________________________________________________________________[1 mark] (c) Diagram 3.2 shows an incomplete ray diagram. C is the centre of curvature and F is the principle focus. Complete the ray diagram to show how the image is formed.

PAPER 2, SECTION B AND C ( QUESTION UNDERSTANDING) – 4 MARKS 1.

Explain why strong double-glazed glass is used as walls of the observation tower in an airport.

2.

Can you explain why a maximum speed of supertanker might need to stop its engine over a distance of about 3 km before it can come to stop.

3.

Using the principle of conservation of momentum, explain the working principle of the rocket

4.

Why the boy with mass 40kg slides down the flume when the angle of inclination is 30 o and remains stationary when the angle of inclination is 17.5o.(the frictional force is 120N)

5.

6.

Why we feel easier to pull the wheel barrow compared to push the wheel barrow?

The toothpaste flows out of it’s tube while squeezing at the bottom end Explain how the toothpaste flows out and name a physics principle related to it.

7.

Explain the principle of Insect Piston Spray

8.

Explain how the vacuum cleaner is able to remove dust from the floor

9.

Bunsen burner burning with yellow flame . Explain how a blue flame can be produced.

10.

Why the ice cube stick to the wet finger. Not to dry Finger?

11.

Tourist at a beach observing the sunset. Explain why the tourist can still able to see the sun even though it has already set.

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