2. fizik k2 set a -jawapan.docx

7/27/2019 2. FIZIK K2 SET A -JAWAPAN.docx

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Answer :

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4.

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b)

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d)

c)

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b)

c)

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i)ii)

iii)

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Ammeter

To measure the Potential Difference across constantan wire //measure Potential Difference between two point.

Zero error = 1µA Accuracy = 1 µAVelocity is the rate of change of displacementTotal displacement = Area under graph

= ½ [(18-6)+(24)]x (4)= 72m (1mark for correct unit)

Average velocity = total displacement / time= 72m/24s= 3ms

-1

- depth in liquid- density of liquidPx = ρhg = (0.8X103)(2)(10)

= 16000 Pa --------------------------------------------------------Py = Px + ρhg = 16000 + (1.0X10

3)(1)(10)

= 26000 Pa --------------------------------------------------------Pz= Py + ρhg = 26000 +(1.1X10

3)(1)(10)

= 37000Pa -----------------------------------------------

-Pressure of X, Y, Z is zero,-because liquid drop together.

Lenz’s Law state that the direction of current induced willoppose the change which causes of itP: north polarityQ: south polarity

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7.

d)

e)

a)b)

c)

d)

a)

b)

a)

b)

i)ii)iii)

i)

ii)iii)

i)

ii)iii)

iv)

i)

- increase the rate of motion of magnetic bar

- increase the number of turn of coin in the solenoid

- galvanometer pointer will deflect but opposite to deflectionwhen the magnetic bar move toward solenoid.

- same amount of heat supplied in a second- receive same amount of heat- same mass- same initial temperatureHeat supply = energy supply by heater

= P x t

= 30 x 15 x 60= 27000 J

Q=mcθ27000 = 2X C X (60-27)

C = 409.1 Jkg-1K-1

- Soft iron core- easily to magnetized or demagnetizedV/240=125/2000

V = 15V (1mark for correct unit) Normal brightness means the voltage supplied to a bulb is the same

as the voltage ratings on the bulb. 12 3 = 36 V

Power input =Power outputI (240) = 24 X 3

I = 0.3 A

Wave motion is the transfer of energy from one location toanother location without the transfer of matter.

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8 a)b)

c)

d)e)

ii)

i)ii)iii)

iv)

Transverse waveThe direction of vibration is perpendicular to the direction ofpropagation of the wave motion.

D

D is equal to a distance of two wavelengths.

- Wavelength becomes smaller.- Speed becomes smaller.- Amplitude becomes bigger.v = fλ = 9 x 9 = 81 cm s

-1

v = fλ = 9 x 4 = 36 cm s-1

SiliconDiagram 8.1 is forward-biased Diagram 8.2 is reverse-biasedThe ammeter reading in Diagram 8.1 is higher but Diagram8.2 is zeroThe connection of the diodeand the connection of the dry cellIt converts alternating current to direct currentD1 and D3 D4 and D2

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9. a)

b)

c)

d)

i)

ii)

Energy caused by vertical position from ground

- The height of the ball at P > at Q- Gravitational potential everg of the ball at P > at Q- The velocity of the ball at Q > at P

- The Kinetic energy at Q > at P- The Kinetic energy increases as the gravitational potentialenergy decreases.Principle of conservation of energy

- Velocity increases- Kinetic energy maximum / increase- Based on the principle of conservation of energy, gravitationalpotential energy is zero because changed to maximum kineticenergy.

- Semi circular curve shaped- Exchange between kinetic energy and gravitational potentialenergy easily- Increasing / decreasing slope slightly- Easily oscillates caused by changing of energy- Smooth surface- Easily to moves // Reduce frictional force- Soft layer at the surface- Reduce impulsive force when landing / accident.- Strong material // concrete of foundation of the track.- Withstand to the high force caused by jumping and landing

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10. a)

b)

c)

Radioactive decay is the process in which an unstable nucleusbecomes stable by emitting radioactive rays.

- The initial radioactive mass of Diagram 10.1 is same toDiagram 10.2- the rate of radioactive decay of Diagram 10.2 is faster thanDiagram 10.1

- Diagram 10.1 taken longer time to elapsed the sources thanDiagram 10.2

- The time taken for the fraction of radioactive source tobecome half is same to the time taken to elapsed half of thesource.- The time taken of both call half-life.

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d)

e)

i)

ii)

i)

- The proton in the nucleus of Uranium will decrease from 92to 90 during the decay

- The number of neutron in the nucleus of Uranium is remain144 during the decay

- Liquid- because liquid state can flow with blood- Gamma ray- Because it can easily pass through the tissues- must short (less than 24 hour)- avoid the radiation stay too long in the body- Geiger-Muller Tube- GM tube can detect the gamma ray

- the radioisotope emitted the gamma ray- detector trace or detect continuously to monitor themovement of the radioisotope

4 He2

236 232 Th +90U =92

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11. a) i)

ii)

Specific heat capacity is the amount of heat required to raisethe temperature of 1kg of a substance by 1K.

- Low Density- easy to carrier the container / weight of container will be light- Specific heat must high- It able to receive more heat from exterior, // it can remain thetemperature in the box.- High Melting point

- Can resist high temperature-Thermal conductivity must be low- so that heat transfer between the box interior and theexterior surrounding is low.

I choose material C because it has low density, high specificheat capacity, high melting point and low thermal conductivity.

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b) i)

ii)

iii)

1 mark with correct axis with the unit.1 mark for the shape of the graph1 mark for label with importance point in temperature

Q=mcθ=0.4x4200x(80-30)=84KJ (1mark to correct unit)

When hot water is poured into the glass, the glass becomeshotter and expands.This causes the crack to get bigger.

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12.

a) i)

ii)

iii)

An electromagnet is made by winding a coil of insulated wireround a soft iron core, so that it becomes a magnet when a

current is passed through the coil.-When the switch is closed, current flows, the U-shaped ironcore becomes a magnetand pulls the iron armatureand the hammer hits the bell

-When the armature is attracted by the electromagnet, thecontact between the armatureand the screw is broker, the circuit is not complete,no current flows,the iron-core loses all its magnetism,

the armature is pull back to its initial position by the springysteel, there is contact between the armature and the screwagain.

-The process describe above will repeat continuously and-cause the hammer to hit the bell repeatedly.-The a.c will magnetized the soft-iron too,-and also attract the iron-armature

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θ / C

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b)

- Resistance must low- less energy loss \ less heat produce- Density must low- cable is not heavy // easy to carry

- Conductivity must high- more current can carry / current easy flow / less resistance- Rate for thermal expansion must low- less sagging (extension) of the cables in hot weather // noextension in high temperateY is most suitable because y has low resistance, low density,high conductivity and low rate for thermal expansion.

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2. fizik k2 set a -jawapan.docx

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