Model set -1 All the questions are compulsory. Section 'A': Objective Questions [10 x 1 = 10] Choose the best alternative of the following questions. 1.Which of the following is a derived unit? a. Kilogram b. Hertz c. Meter d. Mole 2. Why is juniper kept in gymnosperm? a. Because it bears cones instead of flowers and seeds are naked without fruit. b. Because it bears flowers and has needle-like leaves. c. Because it bears flowers and produces seed. d. Because seeds are enclosed in fruit and found in cold region. 3. Study the following table. Column A Column B i. Pigeon 1. Four-chambered heart ii. Sea horse 2. Pneumatic bones iii. Crocodile 3. Air sacs are present in the body iv. Man 4. Poikilothermic organism v. Salamander 5. Mammary glands Which of the following pair is perfectly matched? a.i-1,ii-3,iii-2,iv-5,v4 b. i-2,ii-3,iii-4,iv-5,v-1 c. i-2,ii-3,iii-1,iv-5,v-4 d. i-3,ii-4,iii-1,iv-5,v-2 4. In which group of plants does Tinospora cordifolia belong? a.Endangered b. Timber c. Ornamental d. Medicinal 5. If the mass and radius of a celestial body are two times the mass and the radius of the earth respectively, what is the value of acceleration due to gravity of that body? a.9.8 ms-2 b. 4.9 ms-2 c. 19.6 ms-2 d. 10 m/s2 6. When an object is suspended in honey, mustard oil and air using spring balance, the respective weights are found to be X1, X2 and X3. What will be the weight of the object in those medium in decreasing order? a.X1>X2>X3 b.X2>X3>X1 c. X3>X2>X1 d. X1>X3>X2 7. The deviation rate of red, green and violet light rays seen during the dispersion of the light through a glass prism are denoted by Dr, Dg and Dv respectively. Similarly, their frequencies are represented by Fr, Fg and Fv respectively. Which order is correct for those deviations and frequencies? a. Dv>Dg>Dr and Fv>Fg>Fr b. Dr>Dg>Dv and Fv>Fg>Fr c. Dv>Dg>Dr and Fr>Fg>Fv d. Dr>Dg>Dv and Fr>Fg>Fv 8. According to Hubble's theory, which one of the following facts is correct? a. The farther away the galaxies are the more speed they will have. b. The farther away the galaxies are the lesser the speed they will have. c. There is no relation between the speed and distance of galaxies. d. The gravitational force of the galaxies does not affect their speeds. 9. Study the following statements: i. Phosphoric acid is a positive catalyst. ii. Manganese dioxide increases the dissociation rate of potassium chlorate. iii. Acid-base reaction is always double displacement reaction. iv. Double displacement reaction is called neutralization reaction. a. Only 'i' is correct b. Only 'ii' is correct c. Both 'ii' & 'iii' are correct d. Both 'iii' & 'iv' are correct
10. Gas 'A' is formed by limestone and dilute hydrochloric acid. Gas 'B' is formed by lime water and ammonium chloride. Which compound is formed by heating 'A' and 'B' at about 1500°C? a.Carbon dioxide b. Ammonia c.Ammonium carbonate d. Urea Section 'B': Very Short Questions [9 x 1 = 9] 11. What is meant by scientific learning? 12. Identify the pure water and sugar solution from the diagram given below. 13. Write any one condition necessary for total internal reflection of light. 14. Which lens must be used in spectacles to correct the defect of vision given below? 15. What will be the number of turns in the primary coil in the transformer given alongside? 16. India's Chandrayaan-3 has successfully landed on the moon's surface on 23rd of August 2023. After launching a rocket from the earth, the distance of the rocket from the earth increases due to its initial speed but the speed of the rocket decreases due to the force of gravity. Similarly, the gravitational force also goes on decreasing as distance increases. If the effect of gravity became zero before the speed of the rocket become zero, what would be the future of the rocket? 17. Element E1 lies in 3rd period and p-block. Similarly, element E2 lies in 2 nd period and p-block of modern periodic table. While reacting with Sodium, E1 forms NaE1 and E2 forms NaE2. Which has higher electronegativity among E1 and E2? 18. Hydrogen peroxide is not stored in a transparent vessel. Give reason. 19. Name the metal obtained from quartz veins. Section 'C': Short Questions [14 x 2 = 28] 20. V 2 = ut is not a valid relation. Give reason. 21. Distinguish between Ascaris and Taenia in two points. 22. Study the concept map given below and complete it. Fertile Sterile Food Sterile 23. What will happen if meiotic cell division does not occur in the reproductive cell of an organism? Explain. 24. How is sex determined in human beings? Explain. 25. While Khusbu was walking on the road, she saw an old man suffering from chest pain. She rushed him to the hospital. The initial examination suggested that he might have a heart problem. Which test Bee Parthenogenesis Fertilization 1 2 3 4
would be appropriate to identify his heart condition? Explain with reason. 26. Look at the picture thoroughly and explain its role in climate change. 27. Show in a diagram how the gravitational force between two bodies varies with their masses and distance between their centres. 28. Write any two differences between weightlessness and freefall. 29. How can we increase the brightness of a bulb connected to the dynamo of a bicycle? Write any two ways. 30. Study the given picture and write what happens in the following situations. i. As a bar magnet is slowly introduced into the solenoid. ii. While introducing the bar magnet rapidly into the solenoid. 31. Though lanthanides and actinides are kept together with other elements in periods, they are kept in different block in modern periodic table. Predict the suitable reason. 32. Mr. Adhikari is going to perform a small activity regarding chemical reaction. For this, he kept AgNO3 in beaker 'A' and KClO3 in beaker 'B'. He kept both the beakers in sunlight for 10 minutes. Which beaker's chemical reduces faster, why? Explain with a suitable reason. 33. A factory is extracting copper from its ore. The ore consists of some volatile impurities. Which method should the factory follow to get pure copper, why? Explain. Section 'D': Long Questions [7 x 4 = 28] 34. Utkrishta wanted to perform an experiment to study effect of temperature on the solubility of the salt. What are the four things need to consider related to variables by him, while finding the correct conclusion of the experiment? 35. A 31 years old woman and her 36 years old husband have been trying to conceive for the past five years. Test of infertility did not show any cause for this. Regular ovulation cycle is normal in her body. Her reproductive tract is also normal, as shown by Hysterosalpingography. Her husband's sperm count is also normal. They are disappointed because they still do not have a child. In this situation, which method should they follow to born their own baby? Explain the procedure of this method with a suitable diagram. 36. Blood circulatory system of human body is showing in the diagram given below. Study the diagram and answer the following questions: i. Name the blood vessels 1 & 2.
ii. L.V. has thicker wall than R.V., why? iii.Name the valve present in between R.A. and R.V. iv.What type of blood is carried by 3 and 8? 37. For taking a bath, Alin heated 25 litres water of temperature 15°C by supplying 8.82x103KJ of heat. Then she mixed that hot water with 35 litres cold water of temperature 4°C. Calculate the final temperature of the mixture. (Given: 1litre water = 1kg water) 38. The focal lengths of the two lenses are 20cm and -20cm respectively. Mention the types of these two lenses. Out of these two lenses, which one forms a virtual and magnified image when an object is kept 16cm away from the lens? Explain it by drawing a scaled ray diagram. 39. A portion of periodic table is given below. Answer the questions on the basis of it. IA IIA IIIA IVA VA VIA VIIA VIIIA Na 2.8.1 Mg 2.8.2 Al 2.8.3 Si 2.8.4 P 2.8.5 S 2.8.6 Cl 2.8.7 Ar 2.8.8 a.Which period of modern periodic table is shown in the table? b.What happens to atomic size when moving from left to right in this period? c.How does reactivity vary when moving from left to right in this period? d.Identify the most reactive metal and most reactive non-metal in this period. 40. Study the diagram given below and answer the following questions. a.What mistake is showing in the diagram? b.What is the mixture of 5% of this gas and 95% of oxygen called? c.What happens when limewater is passed into this gas for a while? d. Draw a corrected diagram. The End!