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Rhoda Osborne
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1 1) The primary colours (i) red, green & yellow (iii) purple, blue & green (ii) green, purple & yellow (iv) blue, green & red 2) The secondary colours (i) blue, green & red (iii) peacock blue, red & magenta (ii) magenta, yellow & red (iv) peacock blue, magenta & yellow 3) Complementary colours (i) blue & magenta (iii) green & magenta (ii) green & peacock blue (iv) red & magenta 4) Loudness depends (i) frequency & energy (iii) frequency & amplitude (ii) wave length & frequency (iv) energy & amplitude 5) Frequency will increase A long length B large diameter C high tension (i) A & B (ii) B & C (iii) A & C (iv) C only 6) High pitch can be obtain (i) more loudness (iii) high amplitude (ii) high frequency (iv) high energy 7) The property that can be changed by heating a rabana or tightening a drum (i) rhythm (ii) loudness (iii) pitch (iv) quality of sound OL Science (English Medium) Seminar - Lyceum International School (14 th August 2012) Page 1

2 8) 10ml & 15ml of water was filled into two identical test tubes named A & B respectively. A boy kept his lips to the brim of each tube and made a whistling sound with equal volume of air and energy. i) Tube A produced a sound with a higher pitch than tube B ii) Tube A produced a sound with a lower pitch than tube B iii) Tube A produced a sound with more loudness than tube B iv) Tube A produced a sound with less loudness than tube B 9) The properties of sound - a sound box, strings with different thicknesses, and keys to which string are connected help to change respectively i) loudness, quality of sound & pitch ii) loudness, pitch & pitch iii) quality of sound, sound & 9) A wave travelled at a velocity of 288kmh -1 due to an object that vibrated 720 times during a time period of three minutes. The distance between two adjacent troughs (i) 10m (ii) 20m (iii) 30m (iv) 40m 10) Waves in which the particles vibrate along the same plane as the movement of the wave (i) sound & water (ii) sound & light (iii) light & primary (iv) sound & primary 11) The rays that heat the objects kept exposed to sunlight (i) infra red (ii) gamma (iii) ultra violet (iii) micro 12) The rays that help to synthesis vitamin D after falling on to the skin (i) infra red (ii) gamma (iii) ultra violet (iii) micro 13) The rays that help the fluorescent substance in tube light, washing powder & some wall paints to produce visual light (i) infra red (ii) gamma (iii) ultra violet (iii) micro OL Science (English Medium) Seminar - Lyceum International School (14 th August 2012) Page 2

3 14) Incorrect statement regarding the electromagnetic waves i) highest velocity is in transparent solids ii) medium is not necessary as there are no vibrating particles iii) all are transverse waves iv) IR rays have more wave length than UV rays 15) Incorrect statement about mirrors i) concave parabolic mirrors are used when shaving ii) concave mirrors are used by dentists iii) convex mirrors are used in super markets to view a larger area iv) type of mirrors used when shaving are used to check the underneath of vehicles 16) The correct answer regarding refraction of light rays i) angle increases when light enter from the a rarer medium to a denser medium ii) no refraction occurs when light comes perpendicular to a surface iii) when the angle of refraction in the denser medium is 90, the angle of incident is called the critical angle iv) the total internal reflection occurs in the rarer medium, when the angle of incident in the rarer medium is more than the critical angle. 17) The incident which is due to the total internal reflection i) light travelling through optic fibers, formation of rainbows & mirage ii) the floor of a swimming pool is seen raised than its original position iii) a fish sees a bird flying in air is much away from the water surface than the original iv) a pencil dipped partially in water is seen like it is bent at the water level OL Science (English Medium) Seminar - Lyceum International School (14 th August 2012) Page 3

4 18) When a beam of white light travels through a glass prism, the light is dispersed to form a spectrum. The colours which will be dispersed least and most are respectively i) red & blue ii) blue & red iii) red & violet iv) violet and blue 19) The incorrect statement regarding the converging lens i) used by people who are suffering from hypermetropia ii) can be used to produce converging rays iii) can be used to produce converging and diverging rays iv) used by people who are suffering from myopia 20) When an object having a height of 2cm is kept 10cm in front of a converging lens having a focal distance of 7.5cm, it produced an image having a height of 8cm. The distance between the image and the object i) 20cm ii) 30cm iii) 40cm iv) 50cm 21) Things which help to protect electric appliances from large amount of current & prevent the uses being from electrocuted due to electric leakage are respectively i) main switch & trip switch ii) distribution box & trip switch iii) distribution box & main switch iv) main switch & trip switch 22) An electric appliance was marked 230V and 100W. The usage of current by this appliance i) 230V x 100W ii) (230V / 100W) 2 iii) 100W / 230V iv) (100W / 230V) 2 23) In a plug base the top, left and right holes are wired with respectively i) yellow, blue & red ii) green/yellow, black/blue, red/brown iii) green, brown/red, black/blue iv) yellow, blue, red 24) The amount of units used by 4 electric bulbs of 75W used for 45 minutes per day in 20 days i) 4x75x45x20kWh ii) 4x75x45x20kWh iii) 4x75x45x20kWh iv) 4x75x45x20kWh 60 60x100 60x x60x100 OL Science (English Medium) Seminar - Lyceum International School (14 th August 2012) Page 4

5 25) In a horse shoe shape magnet, North and South poles are on the left and right sides respectively. A wire was kept horizontally. The direction the wire has to be moved in order to generate current which flows away from you. i) towards the northern pole ii) towards the southern pole iii) upwards iv) downwards 26) An aluminum wire was hanging vertically between a horsed magnetic field which as the northern pole on the left and the southern pole on the right. A positive terminal of a battery was connected to the top end of the wire and the lower end was connected to its negative terminal. The direction the wire will be forced to i) towards the northern pole ii) towards the southern pole iii) towards you iv) away from you 27) A wire conducts current from top to bottom. The magnetic field will be i) from north to south ii) from south to north iii) clock wise iv) anti clock wise 28) In a welding machine, the coil which is connected to the welding terminal has 100,000 turns and the coil which is connected to the power supply has 2000 turns. What will be the voltage produced by the welding machine, when it is connected to a three pin plug. i) 230 x V ii) 230 x 2000 V iii) x 2000 V iv) V x ) When doping, the elements that can be mixed with Ge or Si to produce an n type semi conductor i) B or P ii) B or As iii) P or As iv) B or Al 30) To obtain a forward bias using a p-n junction with silicon semiconductor, i) cathode has to be connected to a the negative terminal of a battery having 0.6V ii) cathode has to be connected to a the negative terminal of a battery having 0.8V iii) anode has to be connected to a the negative terminal of a battery having 0.6V iv) anode has to be connected to a the negative terminal of a battery having 0.8V OL Science (English Medium) Seminar - Lyceum International School (14 th August 2012) Page 5

6 31) A smoothen fully rectified D/C can be obtained by i) using a rectifier diode bridge ii) using a rectifier diode iii) using a rectifier diode and a capacitor iv) using a rectifier bridge and a capacitor 32) Select the incorrect statement regarding transistors i) function as a speed ii) amplify current iii) current will not flow through bc terminals if there is no current flow through the ec iv) current will not flow through ce terminals if there is no current flow through the bc 33) A diagram of a logical gate is given below. A & B are inputs while Z is the output. Select the response which gives the values that the input signals could have for the out to be 1, when considering the higher voltage signal level as 1 and lower voltage signal as 0 i) A=1,B=1 ii) A=0, B=1 iii) A=0, B=0 iv) A=1, B=1 Answer the questions 34 and 35 using the following diagram. 34) Which LEDs will light up when the positive terminal of a supply of 6V, direct current is connect to P and the negative terminal is connected to Q i) L 2, L 6, L 3 ii) L 2, L 5, L 3 iii) L 2, L 6, L 4 iv) L 1, L 4, L 5 35) What observation could be made out of the following, when an A/C supply of 6V, 50Hz is connected in between P and Q i) all LEDs light up ii) L 2, L 3, L 5 and L 1, L 4, L 6 will light up alternatively iii) L 1, L 2, L 3, L 4, L 5 continuously light up iv) only L 1, L 2, L 3, L 4 will light up OL Science (English Medium) Seminar - Lyceum International School (14 th August 2012) Page 6

7 Concentrations 1) 25g of fruit juice was mixed with water and prepared a mixture of 200g. Find its concentration in w/w 2) Find the mass of NaCl necessary to prepare 250g of NaCl solution having a concentration of 20%w/w 3) 40ml of acetic acid was mixed with water till the volume become 160ml. Find the concentration in v/v OL Science (English Medium) Seminar - Lyceum International School (14 th August 2012) Page 7

8 4) Find the volume of ethanol necessary to prepare a 750ml of diluted ethanol solution having a concentration of 30%v/v 5) 190g of MgCl 2 was dissolved in water and prepared a solution of 400ml. Find its concentration in moldm -3 6) Find the mass of NaCl necessary to prepare 600ml of NaCl solution having a concentration of 0.25moldm -3 OL Science (English Medium) Seminar - Lyceum International School (14 th August 2012) Page 8

9 Behaviour of Gas 1) When the mass and the temperature is constant, the volume of a gas is.. proportionate to its pressure - Law 2)The volume of a gas was 200cm 3 when the pressure was 750cmHg. Find its volume when the pressure is increased by another 250cmHg ) When the mass and the pressure of a gas is constant, the volume of a gas is. proportionate to its temperature in Kelvin -..Law 4) When the temperature was 27C, its volume was 600cm 3. Find its volume, when the temperature is increased by 50C..... OL Science (English Medium) Seminar - Lyceum International School (14 th August 2012) Page 9

10 Mixtures i. In mixtures, the composition and appearance of every part of the solution is equal. CD-ACT Eg Salt solution, milk, CuSO 4 (aq) Unopened soda bottle is liquid-gas Brass (Zn + Cu) is a solid-solid.. ii Substances having H-N, H-O, H-F, H-Cl bonds are eg. C 2 H 5 OH, H 2 O, NH 3 iii Substances not having H-N, H-O, H-F, H-Cl bonds are eg. CCl 4, CH 4 iv Polar & Polar =.. Non polar & non polar= Non polar & Polar=.. Enamel =. Hence dissolve in. Emulsion = Hence dissolve in Cross section on an eye OL Science (English Medium) Seminar - Lyceum International School (14 th August 2012) Page 10

11 (1) The optic receptors in the retina.. (2) The part which provide nutrients and O 2 and remove CO 2 and waste products (3) The optic receptors which work in dim light, not colour sensitive and not produce a clear vision. (4) The part which changes the curvature of the lens (5) The part which controls the amount of light enter the lens. (6) The part which has more cones and therefore helps to form a clear vision. (7) The cranial nerve which transmits impulses from the optic receptors of the retina to the cerebrum. (8) The properties of the image formed by the eye lens.. (9) The disease that cannot see short distances. (10) The lens that should be used to overcome the above condition. (11) The power of a lens is measured by. (12) The power of a lens... (13) Eye lids are made up of.... (14) Blinking of eye is a. (15) Function of tears are.. (16) The parts found in the middle ear (17) The part that can get damaged due to high vibrations =.. (18) The part which amplifies the vibration =.. (19) The part which helps in equilibrium of the body =.. (20) The part which helps to equalize the pressure in the middle ear with the outer ear, and which can get blocked due to phlegm = (21) Auditory receptor are found in =.. OL Science (English Medium) Seminar - Lyceum International School (14 th August 2012) Page 11

12 Electrolysis of CuSO 4(aq) using C electrodes (1) CuSO 4 is dissociate into.. (2) H 2 O is dissociate into. (3) Electrons move away from the terminal of the cell. (4) These electrons are given to the. (5) Since electrons are..charged, they can be accepted by ions in the (6) Since H is.. reactive than.., will accept electrons (7) Adding electrons is called (8).reactions happens at (9) Electrons move towards the terminal of the cell. (10) These electrons are produced by the negatively charged (11) Giving out electrons is called (12).. reactions happens at (13) Hence the cathodic reaction is.. (14) The anodic reaction is (15) Since the anode is connected to the.. terminal of the cell it is.. (16) Since the cathode is connected to the.. terminal of the cell it is. (17) Current flows in the opposite direction to the.. (18) Hence current flows from the positive terminal to the. and... to the negative terminal. (19) Therefore the observations are.. OL Science (English Medium) Seminar - Lyceum International School (14 th August 2012) Page 12

Section 1: Sound. Sound and Light Section 1

Section 1: Sound. Sound and Light Section 1 Sound and Light Section 1 Section 1: Sound Preview Key Ideas Bellringer Properties of Sound Sound Intensity and Decibel Level Musical Instruments Hearing and the Ear The Ear Ultrasound and Sonar Sound