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1
<$* #9% /0% ?.<>0 /- *%/%.23$% /0% /-/<7 *39/<$6% /.<5%77%*@
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DEF
SECTION A Attempt ALL questions. You MUST write your answers in this answer booklet. 1. A taxi driver was taking his friends to a popular 20/20 cricket match. Table 1 shows the vehicle's velocity for the first minute of the journey.
Velocity, V/ms
-1
Time, t/s
0.0
0.0
11.0
10.0
23 .0
20.0
34 .0
30.0
47 .0
40.0
57.0
50.0
69.0
60.0 Table 1
(a) Plot on page 3, a graph of velocity (V) versus time (t). (b) From the graph, calculate the slope, p.
[7]
[4] (c) What quantity does the slope, p, represent? [1]
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1
<$* #9% /0% ?.<>0 /- *%/%.23$% /0% /-/<7 *39/<$6% /.<5%77%*@
"#$% &'((
DEF
SECTION A Attempt ALL questions. You MUST write your answers in this answer booklet. 1. A taxi driver was taking his friends to a popular 20/20 cricket match. Table 1 shows the vehicle's velocity for the first minute of the journey.
Velocity, V/ms
-1
Time, t/s
0.0
0.0
11.0
10.0
23 .0
20.0
34 .0
30.0
47 .0
40.0
57.0
50.0
69.0
60.0 Table 1
(a) Plot on page 3, a graph of velocity (V) versus time (t). (b) From the graph, calculate the slope, p.
[7]
[4] (c) What quantity does the slope, p, represent? [1]
)*+ ,-. /0% $%1/ 23$#/%4 /0% 5%0367%89 5%7-63/: ;<9 6-$9/<$/4 /0%$ =-. /0% =3$<7 23$#/%4 /0% 5%0367% *%6%7%. -$ .%<603$? /0% 9/<*3#2@ )3+ A-$/3$#% /0% 5%7-63/:B/32% ?.<>0 -$ >
2
)33+ A<76#7
)333+ H= /0% /-/<7 2<99 -= /0% 7-<*%* /<13 ;<9 ( I'' J?4 *%/%.23$% /0% 2-2%$/#2 -= /0% 5%0367% ;0%$ 3/ 39 /.<5%773$?
)%+ )3+K%=3$% /0% /%.2 8*39>7<6%2%$/8@ D&F
)33+ A-2>7%/% L>.->.3.%9%$/9 /0% N#<$/3/:4 ?35%$ 3$ /0% /
2
3
>.%9%$/ /%2>%.
Scalar
Vector
Displacement Acceleratio n
Total 25 marks
2. (a) (i)Complete Table 3 by inserting the correct symbol and Sl Unit which relate to the quantity shown in Column 1. [3] TABLE 3
DS>%63=36 T%<63/: -= ;%63=36 W
Symbol
)33+
SI Unit
/0
/039 2%7/ 3$? <$* Specific Latent Heat of 0%7<6% -5%. C'' 94 6<76#7
)33+ K%=3$% /0% /%.2 80%<63/: -= < 9#M9/<$6%8 @ D&F
c
)333+ O.3/% /0% %N#%63=36 0%<63/: ;3/0 0%<63/:@D(F
)M+ P M#9: 0-#9%;3=% 7%=/ &I ? -= 36% 3$ <$ ->%$ 3$9#70-$%@ O0%$ 90% .%/#.$%*4 /0% 36%
4
Total 15 marks
)333+ Y<2% /0% 2
3. Figure 1 shows a simple cell connected to a circuit.
)35+ H$ /0% 63.6#3/ 3$ ,3?#.% (4 3= /0% 6#..%$/ 39 9/%<*: >%. ;3.% 3$ Z' 9@ DCF
)5+ K%/%.23$% 0-; 2#60 60<.?% ?-%9 /0.-#?0 /0% 932>7% 6%77 3$ Z' 9@ D(F
)M+ )3+ H*%$/3=: /0% /:>% -= 6#..%$/ )*@6@ -. <@6@+ ;0360 ?%$%.%63=36 ;<5%=-.29 P4 [ <$* A 90-;$ 3$ L
)<+ )3+T-; *-%9 /0% =7-; -= /0% 6#..%$/ ;3/03$ /0% 932>7% 6%77 *3==%. =.-2 /0>%. ;3.%X D&F
)33+ Y<2% /0% 2-93/35% /%.23$<7 3$ < *.: 6%77@ D(F
4
5
SECTION B Attempt ALL questions. You MUST write your answers in the space pro vided after each question .
4 (a) Eron, a form five Physics student, has available to him a bright filament light in a ray box, an opaque screen with two closely spaced narrow slits, and a large white screen. Describe how he can set up the apparatus to be able to observe an interference pattern of light and dark bands on the white screen and briefly explain why this pattern forms. [6]
(b) Figure 2 shows a narrow beam of white light which is shone onto a )33+ K%/%.23$% /0% >%.3-* <$* =.%N#%$6: =-. O<5%=-.2 A@ DEF
triangular prism at an angle of incidence of 30°.
Total 15 marks
)3+ H= /0% <$?7% -= .%=.<6/3-$ =-. /0% 53-7%/ 73?0/4 "5 39 &'Q4 ;0.392 =-. 53-7%/ 73?0/X
DCF
)33+ A<76#7%%* -= /0% 53-7%/ 73?0/ 3$ /0% >.392@
DCF
)333+ A<76#7
6
]%7-63/: -= 73?0/ 3$ <3. U C # ('^ 2 9B(F
DCF
[4]
(ii) The mass of the sun is lost at the rate of 2.0 x 10 9 kg s-1 . If the speed of
L-/<7 (I 2<.J9
light in a vacuum is 3.0 x 108 m s-1, calculate the power output of the sun in
5. Many modern electrical appliances have been designed to operate with a.c.
kilowatts.
[5]
Total 15 marks
power rather than d.c. power because electrical power is transmitted as a.c. rather than d.c. (a)
(i)State two advantages of using a.c. to transmit electrical power.
[2]
(ii) Draw a diagram of a simple transformer indicating the features, which enhance efficiency. (b)
[4]
Electrical power produced by Powergen in Trinidad is stepped up from 11 000 V at 8 000 A to 110 000 v for transmission to Tobago. (i) If the number of turns in the secondary coil is 900, calculate the number of turns in the primary coil for an ideal transformer [3] (ii) Calculate the transmission current for the ideal transformer referred to (b) (i).
[3]
(iii) Calculate the transmission power if the transformer is 70% efficient.[3] Total 15 marks
6. (a) (i)Outline THREE uses of radioisotopes in medicine. [3] (ii) State THREE safety precautions to be taken when using radioactive substances.
[3]
(b) (i) A gram of living plant material with Carbon - 14, decays at a rate of about 16 disintegrations per minute. When the plant dies, the Carbon - 14 decays, with a half-life of 5 600 years. A gram of the dead plant is found to decay at about 1 disintegration per minute. Calculate the probable age of the plant.
6
7
.(/
"#$%#&' ()** +#,-& (
.-/ K#6=%6#3- 34- &-:%63#$3 15&=- #=32$8 5$ 34- :,&2$3-& #13-& FD) :D SECTION A Attempt ALL questions. You MUST write your answers in this answer booklet. 1. A popular sprinter of mass 60 kg, was running a 100 m race. Her velocity was measured over a 10.0 s period. The results are recorded in Table 1.
.C/ .1/ @:2$8 34- 8&#,4 H$ 5$ ,#8- CL H-3-&92$- 457 1#& 1&59 34- 12$2:4 62$- 34- :,&2$3-& 75%6H ?- #13-& *)D) :D
.#/ 0-12$- 34- 1566572$8 3-&9:;
.M/
<-65=23'
A53#6 (M 9#&N: .(/
>==-6-Ņ$ .(/ .?/ @:- 34- &-:%63: 1&59 A#?6- * 35 ,653 # 8&#,4 51 <-65=23' B-&:%: A29- 5$ ,#8- CD .E/
2. Electromagnetic waves consist of visible light and radiations higher or lower than the wavelength of light. (a) (i) Identify ONE type of radiation with wavelength: a) longer than visible light _ b) shorter than visible light. _ (2) (ii) Complete Table 2, which relates to the sources and uses of electromagnetic waves. (5)
.=/ 0-3-&92$- 34- :65,- 51 34- 8&#,4 5B-& 34- 12&:3 FD) : 51 34- &#=-D
.G/ .H/ I57 2: 34- :65,- 51 34- 8&#,4 &-6#3-H 35 34- #==-6-Ņ$ 51 34:,&2$3-&J
(b) (i) If gamma rays have a wavelength of 3.0 x 10-12 m, calculate the 7
8
frequency of this type of radiation. [Velocity of all electromagnetic waves =3.0 x 108m s- l]
(3)
.M/ A53#6 *M 9#&N: .22/ > &#' 51 &-H 62843 -9-&8-: 1&59 # 86#:: ?65=N #: :457 $ 2$ O28%&- *D 3. (a)Complete Table 3 which relates electrical circuit symbols to the names of electrical components . [6]
.?/ O28%&- ( :457: # =2&=%23 H2#8 D
P1 34- ?65=N 4#: # &-1&#=32B- 2$H-Q 51 *DML H-3-&92$- 34- B#6%- 51 34- #$86-D
8
9
O28%&- ( P$ 34- =2&=%23 :457 $ 2$ O28%&- (L R *S G ! LRC S T! #$H 34- :%,,6' 2: (GUD V234 :723=4 W 5,-$L 34- =%&&-$3 P 34&5%84 34- #99-3-& 2: ( >D .2/ W3#3- 34- 15&9%6# 742=4 &-6#3-: B563#8-L
SECTIONB Attempt ALL questions. You MUST write your answers in the space provided after each question. 4. (a) Describe how the apparatus show n in Figure 3 below may be used to show how the temperature of a substance such as naphthalene , varies during cooling. Include in your description any other equipment that may be necessary.
.22/ K#6=%6#3- 34- B#6%- 51 R (D
.C/ .222/ V4#3 2: 34- &-#H2$8 5$ B5639-3-&
X(Y .2B/ P1 :723=4 W 2: =65:-H L 74#3 75%6H ?- 34- $-7 &-#H2$8 5$ #99-3-&L >J
(6) 9
10
(b) In an experiment to determine the specific latent heat of ice , the following results were obtained. Initial mass of water at 30°C = 100 g Final mass of water (initial water plus melted ice) at 20°C = 110 g
of the car will affect the charging of the batteries [3] (iii) In a certain section of road , 200 KW of power is expended to charge 100 cars If each car converts 600 Watts of power to charging the battery, calculate the conversion efficiency. [3] Total 15 marks 6. (a)Some great scientists contributed to the modern-day view of the model of the atom. Two of these were J. J . Thompson and Ernest Rutherford. For EACH of these scientists, describe briefly TWO main ideas they put forward concerning the nature of the atom, including the name of EACH of their models. [6] (b) In final revision for your CSEC Physics examinations, your teacher gave you the following data on some unknown elements:
Assume the container has negligible heat capacity and that the heat lost to the surroundings is equal to the heat gained from the surroundings during the experiment. .2/ 0-3-&92$- 34- 9#:: 51 34- 9-63-H 2=-D X*Y .22/ K#6=%6#3- 34- 4-#3 65:3 ?' 34- 7#3-&D XCY
You are required to determine: (i) which nuclides have the identical mass number (ii) how many neutron s are in the heaviest nuclide (iii) which nuclides are isotopes [5] (c) In a half-life experiment, the data shown in Table 4 were obtained. TABLE 4
.222/ V&23- H57$ #$ -Q ,&-:: 25$ 15& 34- AZA>[ 4-#3 8#2$-H ?' 34- 2=- 2$ 9-632$8 #$H 34- 9-63-H 2=- 2$ 7#&92$8 35 ()\KD X(Y .2B/ I-$=- =#6=%6#3- 34- :,-=212= 6#3-$3 4-#3 51 1%:25$ 51 2=-D XCY ] 6 ] * XW,-=212= I-#3 K#,#=23' 51 7#3-& S GD( " 8 ^ Y A53#6 *M 9#&N: 5. (a)With the aid of at least one diagram, describe how the magnitude of the electromotive force (e.m.f.) induced in a conductor depends on the rate of change of magnetic flux that the conductor experiences. [6] (b) To make electric cars more efficient, they will need to be charged regularly using a magnetic field below the road surface. One solution is to designate one lane of the highway for recharging batteries. (i) In the charging lane cars are required to keep moving. Why should this be so? [3] (ii) Assuming the magnetic field is constant, state with reason , how the speed
Use the data to determine: (i) TWO different values of the half-life of the element (ii) The average half-life of the element [4] Total 15 marks
10
