# extra hsc phys hy 2014 questions

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Two rods X and Y look the same. The N pole of a magnet is brought close, in turn, to each end of both rods. The results of these four actions are shown in the table. end tested result P attraction Q attraction R attraction S repulsion Which of the rods is a magnet? A. neither of the rods B. both of the rods C. rod X only D. rod Y only The table shows the voltage and current ratings for four electric heaters. Which heater has the least resistance? Voltage (V) Current (A) A 110 5.0 B 110 10 C 230 5.0 D 230 10 When the circuit shown is connected with switch S open, the 6 V lamp glows.

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Two rods X and Y look the same.

The N pole of a magnet is brought close, in turn, to each end of both rods. The results of these four actions are shown in the table.

end tested resultP attractionQ attractionR attractionS repulsion

Which of the rods is a magnet?

A. neither of the rods

B. both of the rods

C. rod X only

D. rod Y only

The table shows the voltage and current ratings for four electric heaters.

Which heater has the least resistance?

Voltage (V) Current (A)A 110 5.0B 110 10C 230 5.0D 230 10

When the circuit shown is connected with switch S open, the 6 V lamp glows.

What happens to the brightness of the lamp when switch S is closed?

A It becomes brighter.

B It remains the same.

C It becomes dimmer.

D It goes off.

Which circuit shows the correct use of a voltmeter in measuring the p.d. across the resistor?

Four wires are made from the same material. Which wire has the greatest resistance?

A vehicle of mass 900 kg is travelling with a velocity of 20 m / s.

What is the momentum of the vehicle?

A 45 N.s B 450 N.s C 18 000 N.s D 180 000N.s

A car of mass 1200 kg is travelling forward at a constant speed of 20 m / s. Fig. 4.1 shows the driving force and

the frictional force acting on the car.

(i) Explain why the car does not accelerate. [1 mark]

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(ii) Calculate the distance travelled by the car in 30 seconds. State the formula that you use and show your working. [2 marks]

Formula used:

Working:

. . . . . . . . . . . . . . . m

(iii) Calculate the work done by the driving force in 30 seconds. State the formula that you use and show your working. [2 marks]

Formula used:

Working:

. . . . . . . . . . . . . . . J

(b) A pedestrian steps into the path of the moving car. Fig. 4.2 shows a graph of how the speed of the car changes from the moment when the driver sees the pedestrian until the car stops.

How long does it take between the driver seeing the pedestrian and the brakes being applied?Explain your answer. [2 marks]

Time taken = . . . . . . . . . . . . seconds

Explanation:

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[Total for question = 7 marks]

Fig. 10.1 shows a circuit containing four ammeters, A1, A2, A3 and A4.

Table 10.1 shows the readings on each ammeter.

(a) Electric current is a flow of electrical charge.

(i) State the name of the particle that carries charge around an electrical circuit when a real current flows. [1 mark]

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(ii) State the unit of electrical charge. [1 mark]

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(b) (i) Which one of the following statements about the resistor R1 in Fig. 10.1 is correct? Tick the correct box.[1 mark]

The resistance of R1 is less than 40 Ω.

The resistance of R1 is equal to 40 Ω.

The resistance of R1 is greater than 40 Ω.

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(c) (i) Write down the equation connecting resistance R, potential difference V and current I. [1 mark]

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. . . . . . . . . . . . V

(iii) State the potential difference across the power supply. [1 mark]

. . . . . . . . . . . . V

[Total for question = 6 marks]

Fig. 7.1 shows the motion of a bus from one stop to the next.

Describe the motion of the bus during BC and during CD using numerical data. [4 marks]

BC:

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CD:

__________________________________________________________________________________________

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(b) Calculate the distance covered by the bus from A to D. Show your working. [3 marks]

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c) Fig. 7.2 shows two toy buses. Bus A has a mass of 0.5kg and bus B has a mass of 0.3 kg. Both buses are moving in the same direction.

Bus A is travelling at 1.0 m / s and bus B is travelling at 0.5 m / s. When they collide, bus A and bus B join together and move in the same direction.

Calculate the speed at which they continue to move.

Show your working and state the formula that you use.

Formula used: _______________________

Working:

__________________________________________________________________________________________

__________________________________________________________________________________________

__________________________________________________________________________________________

__________________________________________________________________________________________

(d) The headlamps on a bus are connected in parallel as shown in Fig. 7.3.

Each headlamp has a resistance of 4 ohms.

Calculate the combined resistance of the two headlamps.

Show your working and state the formula that you use.

Formula used: _____________________________________

Working:

__________________________________________________________________________________________

__________________________________________________________________________________________

__________________________________________________________________________________________

__________________________________________________________________________________________

(a) In this experiment you will be investigating the effect of a force acting at different angles.

Set up two smooth rods or pulleys 20 cm apart and at the same horizontal level at least 30 cm above the bench.

Attach 50 g masses to both ends of a piece of thread so that when the thread is placed over the two smooth rods or pulleys, the masses are clear of the bench. See Fig. 2.1.

Hang a 10g mass, m, from a point halfway between the smooth rods or pulleys, ensuring that the thread moves smoothly over the rods.

Allow the mass to drop freely; do not pull it down. Hold the protractor sheet behind the apparatus and adjust the position of the sheet so that the angle,

θ, as shown in Fig. 2.2, is the same on both sides. Measure angle, θ, and enter the value in column 2 of Table 2.1 on page 6.

.