Phy P2 Trialspm Terengganu 08(ans)

PAPER 2 SECTION A No 1 a) b) c) d) Total

1M 1M 1M 1M 4M

Q2/S2 (a) 1 (b)

Answer Bourdon Gauge Pressure Increase Pressure Law

Distance between two consecutive / successive point in phase in phase / crests / trough. Substitute v and λ in v = fλ correctly.

v λ 2 m s −1 = 2m

f = 1 2 (c)

1 2

= 1 Hz

Answer with correct unit.

Frequency increases. Frequency inversely proportional to the wavelength // Wavelength decreases.

Tot/Jum : 8

No 3 a) b) c) i) ii) Total

1M 1M 1M 1M 1M 1M 6M

Elastic Potential Energy  Kinetic Energy Nearer ½ ( 10 ) ( 20 x 10-2 ) 1.0 J ½ mv2 = 1.0 J v = 10 m/s

answer with unit answer with unit

Question 4 Section

Mark

Answer

Notes

4 (a)

1

(b) (i)

1 1

Alpha deflects to negatively plates Gamma no deflection

(b) (ii)

1 1

Alpha positively charge Gamma neutral

(c)

1 1

120g

Total

7

+

60g 30g 7.5g 120 - 7.5 @ 112.5 g

15g

Question 5 Section (a)(i) (ii) (iii) (b) (c) (d) (e)

Marks 1 1 1 1 1 1 2

Total 8 marks

Answer Pencil in Diagram 6.2 more bending/vice versa Density of seawater is higher/ vice versa The higher the density the greater the bending The size of the pencil in the water is greater Diffraction velocity

Note

Question 6 Section Mark

Answer

(a) 1

1 (b)(i)

(b)(ii) 1 1

(c)(i) 1

1

(c)(ii)

1

(d)

1

Total

8

Notes

State the meaning of induced current correctly The current that induced by electromagnetic inductions when the circuit is complete//The current that can be produced without any electrical supply/source Label the polarity of each solenoid correctly 1 X: N 2 Y: S Label the direction of motion of each magnet correctly Diagram 6.1 bar magnet towards the solenoid Diagram 6.2 bar magnet away from the solenoid State the effect of the polarity at the end of the solenoid on the motion of the bar magnet correctly 1 When the bar magnet is pushed towards the solenoid, the end of the solenoid facing the bar magnet has the same polarity as the bar magnet 2 When the bar magnet is pulled away from solenoid, the end of the solenoid facing the bar magnet has the opposite polarity as the bar magnet Name the law correctly Lenz’s Law Correct suggestion Increase the speed of bar magnet/increase the number of turns of the solenoid/use a stronger magnet

Question 7 Section Mark

Answer

7 (a)

1

Pascal’s Principle

(b)

1

When the small piston is pressed down, the pressure is exerted on the liquid and transmits uniformly to the large piston The force is produced and pushes the chair up Some of the force is used to compress air

1 (c)

1

Notes

(d)

1 1

(e)

1 1 1 1

Total

bubbles = F = 100 N Increase the cross sectional area of the big piston @ Decrease the size of the small piston To increase the force multiplier @ Use stronger alloy for liquid To withstand higher pressure without cracking Enlarge the size of the seat To accommodate the larger bodies of adults @ Strengtened the sealt To withstand the heavier adults witout damage

10

Question 8 Section Mark

Answer

(a) 1

(b)(i)

(b)(ii)

State the meaning correctly When 240 V potential difference is supplied, 1.2 kW power is produced

1

Correct substitution 1.2 or 1200 240 240

1

Answer with the correct unit. 5A

1

Correct substitution 240 or 1200 5 240

1

Answer with the correct unit. 48 Ω

(c)(i) 1

Give two suggestions correctly W and Y

1

Give two reasons correctly High boiling point not boil at high

Notes

temperature High resistivity // produced more heat (c)(ii)

(c)(iii)

1

Give two suggestions correctly W and Z

1

Give the reason correctly The fuse rating just bigger the current through the kettle

1

Give the correct choice W Give the reason correctly High boiling point , High resistivity and use 8Afuse

1 Total

12

SECTION B

Bhgn.

Markah

Soalan 9 (a)(i) 1

Jawapan Gravitational force

(ii)

1 1 1 1

Weight lost in Diagram 9.1(b) > Diagram 9.1(c) // vise versa Apparent weight in Diagram 9.1(c) > Diagram 9.1(b) // vise versa Density of water > density of oil The greater the density of liquid, the greater the weight lost / less apparent weight

(iii) (b)

1 1 1 1 1

Uptrust / buoyant force Name two correct force (uptrust and weight) Uptrust small because small volume // vise versa Block sink because weight > uptrust Sheet float because weiht = uptrust

Catatan

(c)

modification explaination 1,2

Strong material Can withstand great force

3,4 5,6 7,8

Accept any reasonable modification

Low density material Lightweight

9,10

Two stage plimsoll line Save in fresh and salt water Big size Can place more goods Aerodynamic shape Reduce water friction

QUESTION 10 Section Marks (a) 1 (b)(i) 1 1 (ii)

(iii) (c)

Answer Unstable nucleus Exponential graph The time taken for the activity to become half of its initial value is constant

1

The time taken for the activity of P to be half its initial value is constant //5 hrs

1 1 1

The time taken for the activity of Q to be half its initial value is constant //100 s Half-life Put the radioactive source opposite the detector

1

Detector is connected to the thickness indicator

1

Detector detect the reading of the changes in counts

1

Thickness is measured with the thickness indicator

1

If the reading of the detector is less than the specified value, the thickness of the paper is too tick/ vice versa

Note

Max 4 (d)

Total 20

SECTION C

1,2

Uses thick lead box Radioactive rays cannot pass through

3,4

Packed into concrete drum and buried underground Prevent the radioactive waste discharged to the environment

5,6

Use forceps/ robotic hand Avoid direct touching

7,8

Use siren Faster warning when leakage

9,10

Wearing photographic films Detect the exposure radiations

Accept other ways and reasons

PART Mrk Question 11 (a) 1

ANSWERS The ability of the material to return to their original shape and size when the force exerted on it is removed.

(b)

(c)

1

-

There are two types of force Attraction and repulsive force between the particles of the solid.

1

-

When the solid is stretched, the molecules displaced away from each other

1

-

Attractive forces are acting to oppose the stretching

1

-

When the solid is compressed, the molecules displaced closer to each other

1

-

1 1 1 1 1 1 1 1 1 1

Repulsive forces are acting to oppose the compression suitability -small diameter -enough space for the spring to be installed -more than 1000N -can support motorcylist up to 100kg

-higher spring constant -small compression of the spring

-small natural frequency -to reduce bumping Choice and reasons D , small diameter , highest elastic limit ,highest spring constant and small natural frequency

NOTE

Q12/S12 Sect. Mark (a)(i) 1

(a)(ii)

1

Max 4 1 2 3 4 5

(a)(iii)

(b)(i)

10

5

(b)(ii)

State the correct current flow through primary coil. When a.c. voltage is supplied to primary coil, alternating current will flow. State the correct magnetised of iron core. The soft iron core is magnetized. State the correct change of magnetic flux. The magnet produced varies in magnitude and direction. State the correct change of magnetic flux in secondary coil. This causes a changing magnetic flux pass through the secondary coil. State the correct result of induced e.m.f.in secondary coil. An induced e.m.f. across the secondary coil is produced

1 5 2 6 3 7 4 8 9 10

State the correct characteristics and reasons Step-down transformer Capable of reducing potential difference / voltage Ratio 20 : 1 // 240 : 12 // Np = 4000 turns and Ns = 200 turns Reduce potential difference 240 V to 12 V Using four diodes Full wave rectification. Using a capacitor. To smooth out output current // produce output of steady direct current. The most suitable circuit is S Step-down transformer, Ratio is 20 : 1, Using four diodes and using a capacitor.

1

Output voltage of trans former = 12 V

2

Input power = IpVp = 240 x 0.5 // 120 W

3

Output power = 12 x 4.0 // 24 + 24 // 48 W

4

Efficiency =

5 Total : 20

State the meaning of ideal transformer correctly Transformer which produce output power equal to input power // Transformer which has 100% efficiency.

48 ×100 % 120

= 40 %