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REVISION FORM 5 2

Total questions: 120

Worksheet time: 20hrs 0mins

Name
Class
Date
1.

Which of the following quantities is a vector quantity?

a)

Density

b)

Power

c)

Energy

d)

Force

2.

Diagram 2 shows a displacement – time graph for the motion of an object.

The momentum of the object is zero from

a)

0 s to 2 s

b)

2 s to 4 s

c)

2 s to 6 s

d)

6 s to 8 s

3.

Diagram 3 shows two trolleys, A and B of the same mass on a frictionless plane. Trolley A moves and collides with the stationary trolley B

Which statement is true?

a)

The collision is an elastic collision

b)

Both trolleys do not undergo change in momentum

c)

The total momentum before and after the collision is the same.

d)

The total kinetic energy before and after the collision is conserved.

4.

Diagram 5 shows a trolley with an electric fan.

What happens to the trolley when the electric fan is switched on?

a)

Moves towards Q

b)

Moves towards P

c)

Remains stationary

d)

Moves towards Q and then towards P

5.

Which situation produces zero net force?

a)
b)
c)
d)
6.

Which of the cuboid-shaped stones produces the least pressure on the surface of the ground if all of them are made of the same material?

a)
b)
c)
d)
7.

Diagram 7 shows a cradle chair. The spring enables the chair to cradle when someone is sitting on it.

In order to support the weight of a heavier person, the spring of the chair should be

a)

longer

b)

bigger in diameter

c)

made of copper wire

d)

made of thicker wire

8.

Diagram 9 shows a water reservoir supply water to a house.

Given the density of water is 1000 kg m–3. Calculate the pressure of the water supplied at point R, in Pa unit.

a)

5.2 × 105

b)

5.3 × 105

c)

5.7 × 105

d)

6.3 × 105

9.

Diagram 10 shows four shoe heels of different shapes worn by the same lady.

Which shoe heel exerts the greatest pressure on the ground?

a)

A

b)

B

c)

C

d)

D

10.

Diagram 12 shows a hydraulic jack.

Which modification on piston P will increase the pressure in piston Q?

a)

Decrease the height, h

b)

Increase the height, h

c)

Decrease the cross-sectional area

d)

Increase the cross-sectional area

11.

Diagram 13 shows a manometer being connected to a gas X supply.

Atmospheric pressure is 75 cm Hg. What is the pressure of gas X?

a)

73 cm Hg

b)

75 cm Hg

c)

77 cm Hg

d)

79 cm Hg

12.

Diagram 14 shows two identical toy ducks floating on the surface of different liquids, X and Y.

Which statement is correct?

a)

The density of liquid X = the density of liquid Y

b)

The density of liquid X < the density of liquid Y

c)

The buoyant force acting in liquid X = the buoyant force acting in liquid Y

d)

The buoyant force acting in liquid X > the buoyant force acting in liquid Y

13.

The flow of air through the tunnel from X to Y can be explained using

a)

Pascal’s principle

b)

Archimedes’ principle

c)

Bernoulli’s principle

d)

Principle of equillibrium

14.

Diagram 16 shows an oven is used to bake a cake. After 40 minutes, the cake reaches thermal equilibrium.

When is thermal equilibrium reached?

a)

When the oven has reached its maximum temperature.

b)

When all the heat from the oven has transferred to the cake.

c)

When the temperature of the cake is higher than the temperature of the oven.

d)

When the net rate of heat transfer between the cake and the oven is equal.

15.

Diagram 18 shows a heating curve of a liquid.

Which statement explains the condition in section YZ?

a)

Latent heat of fusion is used

b)

No heat is absorbed by the liquid

c)

Kinetic energy of the molecules increases

d)

The liquid experiences a phase change from liquid to gas

16.

Diagram 19 shows a man standing at a distance of 4 m in front of a plane mirror.

If the man steps backward 2 m from his initial position, what are the characteristics of the image formed by the mirror?

a)

Real and diminished

b)

Real and same size

c)

Virtual and diminished

d)

Virtual and same size

17.

Table 20 shows three different mediums with their refractive indices.

Which ray diagram is correct?

a)
b)
c)
d)
18.

Diagram 21 shows a pencil which appears bent when submerged in water.

What is the phenomenon which gives the impression that the pencil is bent?

a)

Reflection of light

b)

Diffraction of light

c)

Refraction of light

d)

Total internal reflection of light

19.

Diagram 22 shows a light ray propagating from glass to air.

What is the refractive index of the glass?

a)

1.19

b)

1.25

c)

1.31

d)

1.56

20.

The critical angle for a glass-air boundary is c.

Which diagram shows the correct path of the light ray?

a)
b)
c)
d)
21.

Which phenomenon is not related with total internal reflection?

a)

The formation of mirages

b)

A straight object looks bent in water

c)

Propagation of light in an optical fibre

d)

Rainbow observed after a heavy downpour

22.

Diagram 23 shows the image of a spoon which is observed by using a magnifying glass with a focal length of f.

At which position A, B, C or D the spoon should be placed so that the image formed is virtual, upright and magnified?C

a)

A

b)

B

c)

C

d)

D

23.

A system is forced to oscillate at a frequency equals to its natural frequency by an external force. This phenomenon is called

a)

damping

b)

rectification

c)

resonance

d)

pitching

24.

Diagram 24 shows the sound waves produced by a loudspeaker.

Which combination is correct?

a)
b)
c)
d)
25.

Diagram 25 shows water waves moving towards a harbour.

Which statement about the waves arriving at Y is correct?

a)

The speed increases

b)

The wavelength increases

c)

The frequency decreases

d)

The wave energy decreases

26.

In a Young double-slit experiment, light waves with wavelength of 600 nm pass through the double-slit with separation of 0.5 mm to form an interference pattern on a screen. The distance between the screen and the double-slit is 5 m. What is the distance between two adjacent bright fringes of the pattern?

a)

3.6 mm

b)

4.8 mm

c)

5.6 mm

d)

6.0 mm

27.

Diagram 27 is a graph which shows how the potential difference, V, across the terminals of a cell changes with the current, I, through the cell.

What is the internal resistance of the cell?

a)

1.02 Ω

b)

1.25 Ω

c)

1.43 Ω

d)

6.00 Ω

28.

Diagram 28 shows an electric circuit.

What is the reading of the ammeter when the switch is closed?

a)

0.70 A

b)

1.20 A

c)

1.62 A

d)

2.82 A

29.

An electric motor device has the input energy 200 J and output energy of 180 J. Which statement is correct?

a)

A

b)

B

c)

C

d)

D

30.

Diagram 29 shows the set up of the apparatus to study the pattern of the magnetic field produced by the current in a straight wire.

Which of the correct pattern and direction of the magnetic field that will be seen by observer?

a)
b)
c)
31.

Diagram 31 shows a current-carrying coil in a magnetic field.

What will happen to the coil?

a)

Rotates clockwise

b)

Vibrates

c)

Rotates anti clockwise

d)

At rest

32.

Diagram 32 shows the arrangement of apparatus to study the effect of force on a current carrying conductor in a magnetic field. The conductor moves to the left at a small angle when current, I, flows in the conductor in the direction as shown.

What should be done so that the conductor moves to the right with a bigger deflection?

a)

Reverse the polarity of magnet and increase the value of current

b)

Maintain the polarity of magnet and reduce the value of current

c)

Change the direction of current and reduce the strength of magnet

d)

Maintain the direction of current and increase the strength of magnet

33.

Diagram 33 shows a bar magnet moving towards a solenoid.

Which of these actions will not increase the deflection of the galvanometer pointer?

a)

Reversing the polarity of the magnet

b)

Increasing the number of coils in the solenoid

c)

Increasing the speed of the bar magnet

d)

Increasing the number of magnets used

34.

Diagram 35 shows a circuit consisting of diode.

The trace on the screen of the cathode ray oscilloscope obtained is

a)
b)
c)
d)
35.

Diagram 36 shows a transistor switching circuit with a light dependent resistor.

The bulb will light up when

a)

the resistor R is disconnected

b)

the surrounding is bright

c)

the terminals of the battery are reversed

d)

the surrounding is dark

36.

Diagram 38 is a graph which shows the decay curve of a radioactive material.

If the initial of the radioactive material is 800 counts per minute, what is the activity after 1 hour?

a)

400

b)

200

c)

100

d)

50

37.

In a fission reaction, an atom of U-235 is hit by a fast moving neutron and 200 MeV of energy is released. The energy released is in the form of

a)

light energy

b)

heat energy

c)

atom U-235

d)

moving neutron

38.

Which color of light moves at the fastest speed?

a)

blue

b)

green

c)

yellow

d)

red

e)

All light travels at the same speed.

39.

A particle is said to have wave-particle duality when that particle exhibits the properties of both _______ and _______

Suatu zarah dikatakan bersifat kedualan gelombang-zarah apabila zarah tersebut menunjukkan kedua-dua sifat _______ dan _______

a)

Wave, Atom

Gelombang, Atom

b)

Wave, Light

Gelombang, Cahaya

c)

Electron, Particle

Elektron, Zarah

d)

Wave, Particle

Gelombang, Zarah

40.

Determine the momentum of a photon of visible light which has wavelength of 500 nm.

a)

A. 3.32 x 10-40 kg m s-1

b)

B. 9.95 x 10-32 kg m s-1

c)

C. 1.33 x 10-27 kg m s-1

d)

D. 3.98 x 10-19 kg m s-1

41.

Which graph shows that V increasing linearly with θ?

a)
b)
c)
d)
42.

Diagram 2 shows a velocity-time, v-t graph for a motion of a toy car.

Which statement is true?

a)

The toy car is at rest from P to Q

b)

The toy car moves with uniform velocity from Q to R

c)

The toy car moves with uniform acceleration from Q to R

d)

The toy car moves with increasing velocity from R to S

43.

Diagram 3 shows a simple water rocket. When the rocket is released from its launcher, water jet is expelled from the nozzle with high velocity.

Which statement is true?

a)

Total initial momentum bigger than 0 kg m s-1

b)

Total momentum after launching is equal to total momentum before launching

c)

Total momentum before launching is half of the total momentum after launching

d)

Total momentum after launching is half of the total momentum before launching

44.

Diagram 4 shows an object of mass 10 kg is pulled by force F1 on an inclined plane with a

frictional force F2

a)
b)
c)
d)
45.

Diagram 6.1 shows a high jump athlete experiences force F1 in time t1 when he falls on the mattress. Diagram 6.2 shows a golfer hit the golf ball with force F2 in time t2.

Which statement is correct?

a)
b)
c)
d)
46.

Diagram 7 shows a shoe of weight, W, is placed on an inclined plane at an angle of θ to the horizontal. The area of the sole of shoe is A. R is the normal reaction and F is the frictional force.

What is the pressure exerted on the inclined plane?

a)
b)
c)
d)
47.

Diagram 9 shows a U- tube which is filled with two immiscible liquids X and Y with different density.

The pressure at both arms of tube is the same at points

a)

P and R

b)

P and Q

c)

P and S

d)

Q and S

48.

Diagram 10 shows three spring arrangements, J, K and L. All springs used are identical.

Which graph shows the correct arrangement of J, K and L?

a)
b)
c)
d)
49.

Diagram 11 shows a siphon to remove dirty water from an aquarium which is placed on a cupboard.

Which statement does not explain this situation?

a)

Pressure at P same as the pressure at Q

b)

Siphon cannot function if there is a leak between P and Q

c)

Pressure in the rubber tube at R must be equal to the pressure at P to ensure the continuous flowing of water

d)

Siphon is not functioning if end of rubber tube, R is at higher level than the surface of the water in the aquarium

50.

Diagram 13 shows a metal rod of uniform cross-sectional area is hung on a spring balance. It is immersed in a beaker of water. Then, the metal rod is raised up by a constant velocity.

Which of the graph shows the changes of the reading on the spring balance?

a)
b)
c)
d)
51.

A cup of hot coffee is left to cool in the air. Which graph shows the change of temperature of the hot coffee after time t?

a)
b)
c)
d)
52.

Diagram 16 shows three blocks P, Q and R, with the same mass. The same quantity of heat energy is applied to the blocks. The temperature rises in block R higher than P, but less than Q.

Which block has the lowest specific heat capacity?

a)

P

b)

Q

c)

R

53.

Diagram 18.1 shows the size of the balloon in the air. Diagram 18.2 shows the same balloon submerged in the water.

Which physics law explains the situation above?

a)

Snell’s law

b)

Boyle’s law

c)

Charles’ law

d)

Pressure law

54.

Which graph obeys the law of reflection?

a)
b)
c)
d)
55.

Diagram 19 shows a coin and its image formed in a beaker filled with water. The refractive index of water is 1.33.

Which combination is correct?

a)
b)
c)
d)
56.

Diagram 20 shows a light ray MN directed to a transparent semicircular block. The critical angle

of the transparent block is 41°. Which direction does the ray move from point O?

a)

A

b)

B

c)

C

d)

D

57.

Diagram 21 shows an astronomical telescope. The focal length of the objective lens and eyepiece

lens of the telescope are fo and fe respectively. The length of the tube of the telescope is L.

Which of the relationship between L, fo and fe is correct for the astronomical telescope at normal

adjustment?

a)

L < fo + fe

b)

L = fo + fe

c)

L > fo + fe

d)

L = fo - fe

58.

Diagram 22 shows an object, O placed at 2F of a concave lens. Which point, A, B, C or D, is the position of the image formed?

a)

A

b)

B

c)

C

d)

D

59.

Diagram 23 shows a slinky spring experiment. The speed of vibration is 0.2 m s-1.

What is the frequency of the vibration?

a)

0.1Hz

b)

0.2Hz

c)

0.4Hz

d)

2.5Hz

60.

Diagram 24 shows water waves propagating from region X to region Y. The velocity of the water

waves in region X is 18 cm s-1.

What is the velocity of the water waves in region Y?

a)

4cm s-1

b)

12cm s-1

c)

18cm s-1

d)

27cm s-1

61.

Which diffraction pattern is correct when waves pass through an obstacle?

a)
b)
c)
d)
62.

Diagram 25 shows the interference pattern of water waves produced by two coherent sources, A and B.

Which lines represent nodal lines

a)

Q and S

b)

P and R

c)

R and T

d)

T and Q

63.

Diagram 26 shows sound waves produced by a musical instrument.

Which statement is correct?

a)

P is louder than Q

b)

Q is softer than R

c)

Q is the loudest

d)

P and Q have the same loudness

64.

Diagram 27 shows a drone and its remote control.

Table 2 shows the spectrum of electromagnetic waves.

Which electromagnetic wave is used by the remote control?

a)

P

b)

Q

c)

R

d)

S

65.

Diagram 28 shows a lighted candle placed between plate P and Q. Both plates are connected to

an Extra High Tension (E.H.T.) supply.

Which observation is correct when the switch is on?

a)
b)
c)
d)
66.

Diagram 29 shows an electric circuit. The light bulb lights up when the jockey is pressed at the constantan wire on metre rule.

Which changes are correct when the jockey is slowly moved from P to Q?

a)
b)
c)
d)
67.

An electric kettle of power rating ‘240 V, 3000 W’ is filled with 0.5 kg of cold tap water at 20oC. When the electric kettle is connected to 240 V supply, it takes 1 minute and 30 seconds to boil the water.

What is the heat energy loss to the surroundings in the heating? [Specific heat capacity of water = 4200 J kg-1 oC-1]

a)

102 000 J

b)

168 000 J

c)

228 000 J

d)

270 000 J

68.

Diagram 30 shows a resistor, R and two identical light bulbs, P and Q connected in three different

circuits.

Which pair is correct?

a)
b)
c)
d)
69.

Diagram 31.1 shows an electric circuit to study the relationship between potential difference, V across a battery with the current, I supplied by the battery. The crocodile clips are pressed on position P and Q on the arrangement of resistance wires as shown in Diagram 31.2 and the corresponding readings of ammeter and voltmeter are recorded. The procedures are repeated by pressing the crocodile clips on PR, QS, PT and a graph of potential difference, V against current, I is plotted.

Which graph is correct?

a)
b)
c)
d)
70.

Diagram 32 shows a current carrying conductor.

Which diagram shows the correct magnetic field pattern on the cardboard?

a)
b)
c)
d)
71.

Diagram 33 shows the movement of a current carrying conductor between two magnets.

Which of the following will increase the speed of movement of the conductor?

a)

use longer conductor

b)

use more number of dry cells

c)

change the polarity of the magnet

d)

increase the distance between the two magnets

72.

Diagram 34 shows a bar magnet being pushed towards a solenoid.

Direction of deflection of the galvanometer pointer can be determined by

a)

Lenz’s law

b)

Faraday’s law

c)

Fleming left hand rule

d)

Fleming right hand rule

73.

Diagram 35 shows a step up transformer.

Which step will increase the efficiency of the transformer?

a)

Use laminated steel core

b)

Use thicker coil wire

c)

Increase the number of turns of the primary coil

d)

Decrease the number of turns of the secondary coil

74.

Diagram 38 shows the symbol of a transistor.

Name the type of transistor and terminal P.

a)
b)
c)
d)
75.

A diode is also known as a valve because it

a)

amplifies the currect flowing through it

b)

prevents the current from flowing through it

c)

converts direct current to alternating current

d)

allows the current to flow in one direction only

76.

Which equation is correct for radioactive decay?

a)
b)
c)
d)
77.

0.005 u mass of a radioactive element is changed to nuclear energy in 0.05 μs.

Jisim unsur radioaktif 0.005 u telah ditukarkan kepada tenaga nuklear dalam 0.05 μs.

Which statement is correct about the nuclear fission reaction?

[1 u = 1.66  10-27 kg, c = 3.00  108 m s-1]

a)

Nuclear fission is a reaction where two or more small and light nuclei combine to form aheavier nucleus.

b)

For each reaction of nuclear fission, helium nucleus is formed.

c)

The energy released is 7.47 x 10-11 J

d)

Power of the nuclear fission is 1.494 x 10-5 W

78.

Why do all of the planets orbit the sun rather than Earth?

a)

the sun has more mass

b)

the sun is a star

c)

the Earth is heavier

d)

the sun is in the middle of the milky way

79.
Find the force due to gravity if the mass of the object is 2300 kg and the mass of the other object is 4000 kg. The distance between the two objects is 0.150 m.
a)
0.00409 N
b)
244 N
c)
0.027 N
d)
6.14x10-4 N
80.

Radiation and matter that has the properties of both particle and wave is called

a)

confusion

b)

mixing

c)

entanglement

d)

wave-particle duality

81.

Which pair of physics quantity and SI unit is correct?

a)
b)
c)
d)
82.

Diagram 2 shows a velocity-time graph. The gradient of the graph represent the acceleration.

Which quantity is the manipulated variable?

a)

Time

b)

Velocity

c)

Acceleration

83.

The volume of a liquid in a container is 2.5 cm3.

What is the volume of the liquid, in m3?

a)

2.5 x l0-2

b)

2.5 x 10-6

c)

2.5 x 102

d)

2.5 x 106

84.

A car travels at a velocity of 84.6kmh-l.

What is its velocity in ms-1?

a)

11.8

b)

23.5

c)

84.7

d)

304.8

85.

Which graph shows that F is inversely proportional to X?

a)
b)
c)
d)
86.

Diagram 3 shows a load suspended on a spring oscillating in water.

Which displacement-time graph describes the motion of the load?

a)
b)
c)
d)
87.

Which situation shows forces are in equilibrium?

a)

A car speeding up on a highway

b)

A boat moving with uniform velocity

c)

An aeroplane take-off on a runway

d)

A cyclist slowing down his bicycle

88.

Diagram 5 shows a tractor on a muddy ground.

Why does the tractor has big and wide tyres?

a)

To reduce the pressure on the ground

b)

To support the weight of the tractor

c)

To produce a strong grip on the ground

d)

To avoid the tractor from skidding

89.

Diagram 6 shows three identical springs with the original length of 16.0 cm.

What is the length of Y?

a)

2.0 cm

b)

6.0 cm

c)

l0.0cm

d)

13.0cm

90.

Diagram 7 shows force F1 exerted on a small piston producing pressure P1. Pressure P1is transferred to the large piston to produce pressure P2 and force F2.

Which comparison is correct?

a)

F1= F2

b)

F1> F2

c)

P1= P2

d)

P1= >P2

91.

Diagram 8 shows an apparatus set-up to measure pressure in liquid.

What happens to the height of water h. if the thistle funnel is lowered from level

P to Q?

a)

Increases

b)

Decreases

c)

No change

92.

Diagram l0 shows a manometer is connected to gas supply.

Which comparison about the pressure at X, Y or Z is correct?

a)

Px = PY

b)

Px > PY

c)

PY = Pz

d)

PY > Pz

93.

Diagram 11 shows the apparatus to measure water pressure. What is the water pressure at X?

a)

71.2cm Hg

b)

75.0cm Hg

c)

78.8cm Hg

d)

82.6cm Hg

94.

Which instrument is used to measure atmospheric pressure?

a)

Hydrometer

b)

Bourdon gauge

c)

Barometer

d)

Micrometer screw gauge

95.

Which equipment works based on the Bemoulli's principle?

a)

Suction pump

b)

Bunsen bumer

c)

Vacuum cleaner

d)

Hydraulic jack

96.

Diagram 12 shows 1kg of liquid being heated using an electric heater for 10 minutes.

The temperature of the liquid is increased faster by

a)

using liquid of higher specific heat capacity

b)

reducing the time of heating

c)

reducing the mass of liquid

d)

removing the insulator

97.

Diagram 13 shows two beakers with different volume of liquid X and same initial temperature. Both beakers are then heated with the same amount of heat energy.

Which comparison is correct about the reading of thermometer P and thermometer Q?

a)

Reading of thermometer P > Reading of thermometer Q

b)

Reading of thermometer P < Reading of thermometer Q

c)

Reading of thermometer P = Reading of thermometer Q

98.

What are the characteristics of an image formed by a plane mirror?

a)

Upright and real

b)

Upright and virtual

c)

Inverted and real

d)

Inverted and virtual

99.

Diagram 14 shows a ray of light entering a transparent glass block.

What is the refractive index of the glass block?

a)

0.59

b)

0.69

c)

1.44

d)

1.70

100.

Which equipment uses total internal reflection?

a)

Binocular

b)

Telescope

c)

Microscope

d)

Slide projector

101.

Diagram 16 shows a periscope with two prisms, X and Y.

Which arrangement of prisms X and Y is correct so that the observer can see the image of the object?

a)
b)
c)
d)
102.

Which arrangement of objective lens, L", eyepiece, L. and position of image I, is correct for a telescope at normal adjustment?

a)
b)
c)
103.

What quantity decreases when a wave propagates through a gap?

a)

Speed

b)

Frequency

c)

Amplitude

d)

Wave length

104.

Diagram 17 shows water waves propagating from the sea to the shore. Which waves properties at headland and bay are correct?

a)
b)
c)
d)
105.

Which diffraction pattern is correct when waves pass through an obstacle?

a)
b)
c)
d)
106.

Diagram 18 shows an interference pattern.

What is the wavelength of the water wave?

a)

0.27 cm

b)

0.71 cm

c)

1.88 cm

d)

3.75 cm

107.

Which circuit is used to determine the elecffomotive force, e.m.f. of a dry cell?

a)
b)
c)
d)
108.

Which graph shows the correct relationship between resistance, R and length, / for a conductor?

a)
b)
c)
d)
109.

Diagram 19 shows an electric circuit.

What is the heat energy produced in the circuit in 5 second?

a)

5.63 J

b)

3.75 J

c)

1.88 J

d)

11.25J

110.

Diagram 20 shows the direction of movement of a current carrying conductor that is placed between two magnets.


Which magnetic field pattern is correct to show the situation?

a)
b)
c)
d)
111.

Which is a functional step-down transformer?

a)
b)
c)
d)
112.

Diagram 21 shows a plotting compass placed on a cardboard near a current carrying conductor.

Which compass shows the correct direction of the magnetic field?

a)

A

b)

B

c)

C

d)

D

113.

Diagram 22 shows two bar magnets, P and Q, hang freely at both ends of the solenoid.

Which observation is correct when the switch is turned on?

a)
b)
c)
d)
114.

Diagram 23 shows the process of producing an induced current in a wire.

This process is explained by

a)

Hooke's law

b)

Fleming's right hand rule

c)

Newton's third law

d)

Right hand grip rule

115.

Diagram 24 shows four diodes which are connected to form a rectifier. Which wave pattern is produced on the C.R.O. screen?

a)
b)
c)
d)
116.

Which particle is cathode ray?

a)

Electron beam

b)

Gamma ray

c)

Neutron

d)

Alpha particles

117.

What is the symbol for n-p-n transistor?

a)
b)
c)
d)
118.

25 % of Gallium-65 atoms have decayed after 15 minutes.

What is the half-life of Gallium-65?

a)

30.0 minutes

b)

23.4 minutes

c)

15.0 minutes

d)

7.5 minutes

119.

Diagram 27 shows the equation for the decaying of nucleus X. What is the number of protons and neutrons for nucleus X?

a)
b)
c)
d)
120.

Table 2 shows the information of radioactive samples P, Q, R and S. Which sample is most suitable to detect leakage in underground water pipes?

a)

P

b)

Q

c)

R

d)

S