Channa Asela

Transcription

1 In each of the questions, pick one of the alternatives (1), (2), (3), (4) which you consider is correct or most appropriate. Grade 11 May Name : 1. The characteristic of sound used to differentiate male and female voice. (i) Loudness (ii) Quality of sound (iii) Wave length (iv) Pitch 2. An animal has the following features A. No legs B. No exoskeleton C. Skin has scales (i) (ii) (iii) (iv) Annelida Coelenterata Amphibia Reptilia 3. The absolute zero temperature (i) 0 ๐ C (ii) (iii) (iv) 0 ๐ F -273 K -273 ๐ C 4. The screw and screw driver are respectively (i) Wheel & axel and inclined plane (ii) Inclined plane and lever (iii) Liver and inclined plane (iv) Inclined plane and wheel and axel 5. The formula of an oxide formed by X is XO 2. The formula of its compound formed with H (i) XH 2 (ii) XH 4 (iii) X 2 H (iv) X 4 H Page : 1

2 6. A. Reduce the length of the coil B. Reduce the cross sectional area of the coil C. Increase the voltage between the two ends The change should be made to increase the heating effect of a heater (i) A & B only (ii) B & C only (iii) A & C only (iv) All above 7. A. Use a thick wire B. Reduce the length C. Stretch the string The change should be used to increase the pitch (ii) A & B only (ii) B & C only (iii) A & C only (iv) All above 8. Object A 100g, 200 ๐ C Object B 200g, 100 ๐ C Select the correct statement regarding A and B objects (i) Heat is conducted from object A to Object B (ii) Heat is conducted from object B to Object A (iii) Heat will not conduct (iv) Heat will conduct from one to another the heat of both objects become equal 9. Select the correct statement (i) Metals lead and copper are extracted by reducing with coke (ii) Metals aluminium and zinc are extracted by reducing with coke (iii) Metals aluminium and calcium are extracted by electrolysis (iv) Metals iron and aluminium are extracted by reducing with coke 10. The composition of a solution is 5% w/v. The mass of the solute in 250cm 3 (i) (250/5) x 100g (ii) (100/5) x 250g (iii) (5/250) x 100g (iv) (5/100) x 250g Page : 2

3 11. A factor that does not affect the solubility (i) The temperature of the system (ii) The nature of the solution (iii) The nature of the solute (iv) The nature of the solvent 12. The solubility of CO 2 can be increased by (i) Increasing the temperature (ii) Increasing the pressure (iii) Reducing the pressure (iv) Reduce the temperature 13. A substance which is a solid in room temperature (i) Fluorine (ii) Chlorine (iii) Bromine (iv) Iodine 14. The compound having covalent bonds (i) (NH 2 ) 2 SO 4 (ii) CuSO 4 (iii) AgNO 3 (iv) Li 2 CO A narrow tube with a closed end having 1.5cm long mercury column was kept in an environment having 75.5cmHg of atmospheric pressure. The pressure of the air column trapped in cmhg when the tube was kept the open end up wards and the open end downwards respectively (i) 74 and 77 (ii) 77 and 76.5 (iii) 76.5 and 77 (iv) 77 and The correct way of mixing (i) Enamel mixing with water (ii) Enamel mixing with thinner (iii) Emulsion mixing thinner (iv) Emulsion and thinner mixing with thinner Page : 3

4 17. The graph which represents the Boyle s Law P P V V V V 1/ T 18. A non polar solvent (i) Carbon tetrachloride (ii) Acetone (iii) Water (iv) Ethanol T (i) (ii) (iii) (iv) A Ethyl alcohol and water B Petrol and water C Water and milk D Iodine and ethanol The homogenous mixtures A and D only C and D only A, B and C only A, C and D only A homogenous liquid mixture is formed mixing hexane and heptane with each other. Iodine dissolves well in hexane According to the above information, how does iodine dissolve in heptain (i) Precipitate (ii) Dissolve slightly (iii) Insoluble (iv) Dissolve well Page : 4

5 21. Rocks undergo changes when subjected to very high temperature and pressure and due to earth quakes. What is the type of rock that is formed as a result (i) Metamorphic (ii) Granite (iii) Igneous (iv) Sedimentary 22. 4% v/v means (i) 100cm 3 of water contains 4cm 3 hydrogen chloride (ii) 96cm 3 of water contains 4cm 3 hydrogen chloride (iii) 100cm 3 of aqueous solution contains 4cm 3 hydrogen chloride (iv) 96cm 3 of aqueous solution contains 4cm 3 hydrogen chloride 23. The concentration of the solution, when 12g of urea is dissolved in dissolved in distilled water to obtain 250cm 3 of solution. (H=1, C=12, N=14, O=16) (i) 0.4 mol dm -3 (ii) 0.8 mol dm -3 (iii) 0.04mol dm -3 (iv) 0.08mol dm Correct examples for first, second and third class levers respectively (i) Fishing rod, claw hammer, bottle opener (ii) See-saw, arm bending at the elbow, wheel barrow (iii) Broom, nut cracker, forceps (iv) Scissor, nut cracker, broom 25. The substances having the higher specific heat capacity and lower specific heat capacity (i) Copper & water (ii) Coconut oil and water (iii) Water & aluminium (iv) Copper and coconut oil 26. The X element has two isotopes. They are X and X. They can be identified as isotopes since (i) The their number of protons are equal (ii) The number of neutrons are equal (iii) Their mass numbers are no equal (iv) Their electrons are not equal Page : 5

6 27. Two elements got together and formed a new substance. It did not contain any of the properties shown by the element. The new substance is called (i) Mixture (ii) Suspension (iii) Solution (iv) Compound 28. Along with the growth of a mango tree, the diameter of its stem increased. It is due to the presence of (i) Cambium (ii) Phloem (iii) Xylem (iv) Parenchyma 29. The weight of a substance having a mass of 100g is approximately equal to (i) 0.01N (ii) 0.1 N (iii) 1N (iv) 10N 30. Moment of force is measured in (i) kgms -2 (ii) kgm -3 (iii) kgms -1 (iv) Nm 31. Heat capacity is measured in (i) Js -1 (ii) Jkg -1 K -1 (iii) JK -1 (iv) Jkg -1 C Food is transported in plants as (i) Glucose (ii) Fructose (iii) Sucrose (iv) Starch Page : 6

7 33. The rate of diffusion of water vapour from leaves to the environment can be reduced due to (i) The reduction of water vapour in the atmosphere (ii) The reduction of speed of wind (iii) The increase of light intensity (iv) The reduction of the atmospheric pressure 34. The main function of root hairs of a plant (i) Abortion of water & minerals from soil (ii) Fix the plant to the soil (iii) Absorb soil air from the air spaces in the soil (iv) Asexual reproduction 35. Select the incorrect statement (i) During the cardiac diastole, the atria and the ventricles all will dilate (ii) During the blood transfusion, the blood is sent into a recipient s vein (iii) A person not having the rhesus factor and having O type is an universal recipient (iv) The mal function of atrio ventricular valves will produce hear murmurs 36. The nature of sound waves that travel through air can be demonstrated by (i) A slinky (ii) A stretched string (iii) Tuning fork (iv) Ripple tank 37. A sound was heard 3 seconds after seeing the lightening. The velocity of sound in air is 334ms -2. The distance to the place of lightening. (i) 1km (ii) 2km (iii) 3km (iv) 4km 38. The distance between 2 adjacent crests was 0.2m. 2 crests and 2 troughs occurred per second The speed of the transverse wave (i) 0.1ms -1 (ii) 0.4ms -1 (iii) 0.8ms -1 (iv) 0.01ms -1 Page : 7

8 39. The velocity of the electromagnetic wave was 3x10 8 ms -1. The wave length of an electro magnetic wave which has a frequency of 3x10 2 khz. (i) 10 3 m (ii) 10 5 m (iii) 10 8 m (iv) m 40. The property of waves that will change due to drumming of a rabana harder. (i) Wave length (ii) Amplitude (iii) Pitch (iv) Wave pattern Page : 8