TIMES : SPM2009 Spot Questions - Physics (Kertas 2)

a) Base on Diagram 1,
i) Label the period using the symbol T. [1 mark]
ii) What is the period of the oscillation?
....................................................................................................................................................................
[1 mark]

b) What is meant by amplitude?
....................................................................................................................................................................
[1 mark]

c) If the spring is undergoing damping, what will happen to the amplitude of the oscillation?
....................................................................................................................................................................
[1 mark]

 

(ii) 0.2 s

(b) Amplitude of a wave is the maximum displacement of a medium particle from its mean (stationary) position.

(c) Decreases with time

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 (a) Name this natural phenomenon as observed by the driver.
....................................................................................................................................................................
[1 mark]

(b) State the physics concept that is involved in this phenomenon.
....................................................................................................................................................................
[1 mark]

(c) (i) How is the density of the cool air compare to the density of the warm air?
....................................................................................................................................................................
[1 mark]

(ii) When light rays propagates from a denser medium to a less dense medium,
state what happen to the direction of the refracted rays.
....................................................................................................................................................................
[1 mark]

(iii) Complete Diagram 2.2 to show the formation of the natural phenomenon
as shown in Diagram 2.1.

(a) Mirage

(b) Total internal reflection

(c) (i) Density of the cool air is greater than the density of the warm air

(ii) The light rays will be refracted away from the normal

(iii)

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 (a) Name a physics quantity that relates the mass and velocity.
....................................................................................................................................................................
[1 mark]

(b) State the type of energy that is possessed by the running cheetah.
....................................................................................................................................................................
[1 mark]

(c) Calculate the final velocity of the cheetah and the deer.
[2 marks]

(d) (i) Name the Physics principle that is involved in the above hunting.
....................................................................................................................................................................
[1 mark]
(ii) Define the Physics principle in (d)(i).
....................................................................................................................................................................
[1 mark]

(a) Momentum

(b) Kinetic energy

(c) (60)(20) + (70)(20) = (60 + 70)(V)
V = 17.31 m s-1

(d) (i) Principle of Conservation of Momentum
(ii) In the absence of external forces, the total momentum of a system remains unchanged

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(a) What is meant by wavelength?
....................................................................................................................................................................
[1 mark]

(b) Sound waves with frequency of 5.8 x 105 Hz are used to determine the depth of the sea. The speed of sound waves in sea water is 1250 ms-1. The time-base of the oscilloscope is adjusted at 50 ms cm-1. If the time interval between the transmitting and receiving a pulse of waves is 1.2 s. Calculate

(i) the depth of the sea. [2 marks]
(ii) the wavelength of the sound wave. [2 marks]

(c) Observe the Diagram 4.1 and 4.2.
(i) Compare the amplitude of the reflection waves.
....................................................................................................................................................................
[1 mark]
(ii) Explain your answer in (c) (i)
....................................................................................................................................................................
[1 mark]

(a) The distance between two points of the same phase.

(b)(i) d = 1250 x 0.6 = 750.0 m
(ii) f = 5.8 x 105 Hz
v = 1250 ms-1
λ = 0.00215 m / 2.15 x 10-3 m

(c)(i) The amplitude of the reflection wave in Diagram 4.2 is higher.
(ii) When the depth increases, the energy lost inceases

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(a) What is meant by density?
....................................................................................................................................................................
[1 mark]

(b) Explain why the ice block float in water.
....................................................................................................................................................................
[1 mark]

(c) What are the forces acting on the ice block?
....................................................................................................................................................................
[1 mark]

(d) Base on Diagram 5.1 and Diagram 5.2,
(i) compare the volume of water displaced.
....................................................................................................................................................................
[1 mark]

(ii) compare the weight of water displaced.
....................................................................................................................................................................
[1 mark]

(iii) Compare the buoyant force.
....................................................................................................................................................................
[1 mark]

(iv) State the relationship between buoyant force and the weight of water displaced.
....................................................................................................................................................................
[1 mark]

(v) Name the principle of physics involve.
....................................................................................................................................................................
[1 mark]

(a) Mass per unit volume

(b) Density of ice block is less than density of water

(c) Weight and buoyant force

(d) (i)The volume of water displaced in Diagram 5.1 is more than in Diagram 5.2.
(ii) The weight of water displaced in Diagram 5.1 is more than in Diagram 5.2.
(iii) Buoyant force in diagram 5.1 is greater diagram 5.2
(iv) Buoyant force = weight of water displaced
(v) Archimedes’ Principle

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(a) Name two sources where the ice cube obtained the heat to change into ice water.
....................................................................................................................................................................
[2 mark]

(b) State the change in physical state when the ice cube is melted into ice water.
....................................................................................................................................................................
[1 mark]

(c) (i) Name the physics quantity that is involved when ice cube change to water at constant temperature.
....................................................................................................................................................................
[1 mark]
(ii) Why the temperature is remain constant when ice melts to water?
....................................................................................................................................................................
[1 mark]

(d) If the amount of heat absorbed by the ice cube is 6.72 x 10³ J,
calculate the specific latent heat of fusion.
[2 marks]

(e) Why water droplets are formed on the outer surface of the metal plate?
....................................................................................................................................................................
[1 mark]

(a) Heat from the surrounding
Heat from the metal plate

(b) Solid to liquid

(c) (i) Specific latent heat of fusion
(ii) Heat absorbed is used to overcome the forces of attraction between the molecules of the ice

(d)

(e) Condensation of water vapour on cool surface

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(a) (i) Name the type of the transistor.
....................................................................................................................................................................
[1 mark]

(ii) Transistor has three terminals connected to the emitter, base and collector.
Label the emitter, base and collector in Diagram 7.1

(iii) Bulb does not light up.
No current flows in the base and emitter circuit.

(c) (i) Interchange the position of LDR and R2

(ii) (a) Because collector current is too small
(b) Magnetic relay / Relay switch
Using small voltage to switch on the second with high voltage

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(a) What is meant by electromagnet?
....................................................................................................................................................................
[1 mark]

(b) Base on Table 8, state the suitable properties of the crane to lift iron scrap more effectively.
Give reason for the suitability of the properties.
(i) Current .....................................................................................................................................................
Reason .....................................................................................................................................................
[2 mark]

(ii) Type of core .............................................................................................................................................
Reason ......................................................................................................................................................
[2 mark]

(iii) Number of turns ......................................................................................................................................
Reason .......................................................................................................................................................
[1 mark]

(c) Based on your answers in 8(b), determine the most suitable crane in
Table 8 to lift iron scrap in a factory.
....................................................................................................................................................................
[1 mark]

(d) Base on your choice in 8(c), state the change in the quantity of the iron scrap that can be lifted
when the cylindrical soft iron core is replaced with a U-shaped iron core. Explain your answer
....................................................................................................................................................................
....................................................................................................................................................................
[2 mark]

(e) A crane P is used to lift 250 kg of iron scrap to a height of 4m in 5 s.
Determine the output power of the crane P.
[2 marks]

(a) An electromagnet is a magnet in which a magnetic field is produced by the flow of electric current.

(b)(i) Increase the current.
The strength of an electromagnet increases

(ii) Soft-Iron core
Easily magnetised and demagnetised

(iii) Increase the number of turns.
The strength of an electromagnet increases

(c) L

(d) Increase // More
The poles for a U-shaped electromagnet are closer together

(e)

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(a) (i) What is meant by a refractive index? [1 mark]
(ii) Using Diagram 9.1 and Diagram 9.2, compare the refractive index, refraction angle and
critical angle between the two blocks.
Base on Diagram 9.1 and Diagram 9.2, relate the refractive index with critical angle. [5 marks]
(b) (i) State two conditions under which light ray would undergo total internal reflection. [2 marks]
(ii) Diagram 9.3 shows a light ray is incident on a piece of Crown Glass of critical angle 42°.
Draw the light ray to show how a ray emerging from the Crown Glass.

(a)(i) Ratio sin of incidence angle and sine of refraction angle
(ii) Refractive index digram9.2 larger than diagram 9.1
Refraction angle diagram 9.2 is smaller than diagram 9.1
Critical angle diagram 9.1 larger than diagram 9.2
When the refractive index is large, the critical angle is small

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(ii) Draw a circuit diagram for each circuit and label the type of circuit. [4 marks]

(b) Using Diagram 10.1 and 10.2, compare the brightness of the bulbs.
Relate the brightness of the bulb, the potential different and the current flow for
the bulbs to deduce a relevant physics concept.
[5 marks]

(c) Diagram 10.3 shows an electric kettle which is a rated at 240 V, 2 000 W and
connected by a flexible cable to a three-pin-plug.

(a) (i) Work done in moving one coulomb of charge from one point to another
(ii)

(b) 1. The bulb in parallel circuit // Diagram 10.2 is brighter than those in
series circuit // Diagram 10.1
2. The potential difference across each bulb in the parallel circuit is the
same as that of the battery // dry cell.
3. The potential difference across each bulb in the series circuit is smaller
than that of the battery // dry cell.
4. The current flowing through each bulb in the parallel circuit is higher
than the current flowing in the series circuit.
5. When the potential difference across each bulb is higher, the current
flowing through it is also higher and the bulb is brighter.
(c)

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(a) Degree of hotness of an object

(b) 1. Put the thermometer in melting ice , mark the lower part of
mercury thread,l¬0
2. Place the same thermometer in the boiling water, mark the top part
of the mercury thread, l 100
3. Divide the length between the two marks inti 100 equal divisions
4. Each division is now equal to 1 o C

(c)

(d)(i) Q = mcθ
= 0.5 x 450 x 10
= 2250 J

(ii) Energy lost = 10 x 2250 = 22500 J

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12. Diagram 12.1 shows the Dead Sea Scrolls aged 1900 years old.
An archaeologist used radioisotope to estimate age of the ancient artefact.

 (a) (i) What is meant by radioisotope?
[1 mark]

(ii) Carbon-14 is a radioisotope. Explain how Carbon-14 can be used to
estimate the age of a dead plant, which contain carbon.
[3 marks]

(b) (i) Table 12.2 shows the characteristics of the five radioisotopes, P, Q, R, and T,
that can be used to detect the brain tumour.

As a medical officer, you are required to determine the most suitable radioisotope
that could be used to inject into the blood of a patient to detect the location of a brain tumour.
Study the characteristics of all five radioisotopes based on the following aspects:
- The Half-life
- The ionising power
- The radioactive radiation

Explain the suitability of the aspects. Justify your choice.
[8 marks]

(ii) Name the most suitable detector can be used to detect the radioactive radiation from the
body of the patient. Give your reason.
[3 marks]

(c) In a nuclear reactor, 3.5 x 10-6 g of Uranium is change into energy in 1.5 ms.
Given that the velocity of light, c = 3 x 108 ms-1.
Calculate
(i) the total energy released.
(ii) the power generated by this reaction.
[5 marks]

(a) (i) Radioisotopes are isotopes which have unstable nuclei.

(ii) – Carbon-14 atom is a radioactive substance which is easily
absorbed by living plants.

- after the plants dies, the activity of Carbon-14 will decline
since no new carbon-14 is absorbed.

- by calculating the activity of carbon-14, the age of the
fossil/object can be determined

(b) (i)

Substance R is the most suitable with short half-life, emits gamma ray and
has moderate ionising power.

(ii) Geiger Muller Tube
• Has a small in size, it is handy and can be moved around easily.
• It is a sensitive instrument, so can detect low ionisation