Science and Technology
(Secondary level)
Time : 2 ½ hours Maximum Marks : 85
Note: All questions are compulsory. Marks are given against each question.
Question 1-9 : Please tick (3 ) mark the correct choice.
Q1. The elements whose atoms have completed outermost shell, are called: 1
(i) Non-metals
(ii) Noble gases
(iii) Metalloids
(iv) Metals
Hint: (ii)
Q2. The number of protons, neutrons and electrons in three particles (X, Y and Z) are given below: 1
| Particle | No. of Protons | No. Of Neutrons | No. Of Electrons |
| X | 19 | 21 | 19 |
| Y | 19 | 21 | 17 |
| Z | 19 | 20 | 19 |
Which one of the following statements is correct about the nature of the particles?
(i) X and Y are atoms of two different elements
(ii) X and Z are atoms of two different elements
(iii) Y is an atom and Z is an ion
(iv) X is an atom and Y is an ion
Hint: (iv)
Q3. Which one of the following sets of three elements each is arranged in the order of increasing electronegativity? 1
(i) F, Cl, Br
(ii) F, Br, Cl
(iii) Cl, Br, F
(iv) Br, Cl, F
Hint: (iv)
Q4. A 1.0kg block of ice is floating on water with its 9/10th part immersed. The weight of the block of ice as recorded by a spring balance in this condition will be found to be: 1
(i) 9.8 N
(ii) 8.92 N
(iii) 10.78 N
(iv) Zero
Hint: (iv)
Q5. The treatment of cancer by radiotherapy involves: 1
(i) nuclear radiations
(ii) X-rays
(iii) ultrasound
(iv) laser
Hint: (i)
Q6. Akind of microbes which fix free nitrogen of the atmosphere into nitrites and nitrates are found in: 1
(i) rotting fruits and vegetables
(ii) milk undergoing change to forms curd
(iii) stale bread that has developed bread mould
(iv) root nodules of plants like peas and beans
Hint: (iv)
Q7. The allotrope of carbon, which is slippery to touch and is a good conductor of electricity is: 1
(i) diamond
(ii) bone charcoal
(iii) graphite
(iv) soot
Hint: (iii)
Q8. The cell-organelle, which coordinates the activities of all other cell parts is : 1
(i) lysosome
(ii) mitochondria
(iii) nucleus
(iv) golgi body
Hint: (iii)
Q9. If you find an animal with three pairs of legs, it is likely to be a: 1
(i) scorpion
(ii) spider
(iii) cockroach
(iv) kangaroo
Hint: (iii)
Question 10-16 : Please answer in two - three sentences only.
Q10. Name the state of matter in which the molecules are closely packed and are not able to change places? Give any two examples of this state. 2
Q11. 4.0g of a substanceAreacts with 3.0g of another substance B to give 2.5g of substance C and a certain mass of D. Calculate the mass of D produced in this reaction? 2
Q12. Why fast neutrons are not used in nuclear reactors to get nuclear energy? 2
Q13. One of the purposes of night sky watching is to know in advance the possibility of a head-on collision of a large meteoroid with earth. Suggest a way to avert such an
event and mention any other purpose of night sky watching. 2
Q14. Name the category of components of the environment in which temperature, air and water are included. What is the importance of this component of environment? 2
Q15. Name the cell organelle found in an animal cell where secretion of enzymes occur. What is the function of these enzymes? 2
Q16. A student wrongly identified bat as a bird. Mention any one point, which may have led the student to say so. Also give any two characteristics which support that bat is
not a bird. 2
Question 17-27 : Please answer in 7-8 lines.
Q17. Mention any two points how a clinical thermometer is different from an ordinary mercury thermometer? What is the body temperature of a normal human adult on
Celsius scale? Why cantwe use Laboratory thermometre to measure the temperature of our body? 4
Q18. Give the condition under which the magnitude of displacement is equal to the distance covered by the body.
A body moves from point A to point B 2.0km away on a straight level road and reaches back to A. What is the magnitude of displacement of the body? Also find
out the distance travelled. 4
Q19. State any two similarities and two differences between rusting and combustion. 4
Q20. Name the three components of biosphere. Which event before the appearance of life started the evolution of these spheres? What is the proof of this event? 4
Q21. How are metals generally different from non-metals with regard to the following properties: 4
(i) Electrical conductivity
(ii) Nature of oxides
(iii) Action of acids
(iv) Thermal conductivity
Q22. What is deforestation? How is deforestation related to increased incidence of soil erosion? Give any three points. 4
Q23. What is the characteristic of the kingdom Fungi with regard to: 4
(i) Presence or absence of a distinct nucleus.
(ii) Unicellular or multi-cellular.
(iii) Mode of feeding.
Q24. Draw a diagram of telophase of mitosis in a plant cell division and label the following parts in it: (i) cell plate, and (ii) daughter nuclei 4
Q25. A child patient appears pale, he is losing weight and gets tired very soon. But, he is neither suffering from fever and nor passing yellow urine. 4
(i) Name the disease he is suffering from.
(ii) What is the possible cause of the disease?
(iii) Recommend any two food items for improving his condition.
Q26. What are weeds? Give two examples. Describe any one method other than manual, by harrow or by plough, can be used for removing weeds? 4
Q27. The orbit of a satellite is perpendicular to the equator. What is the inclination of its orbit? What type of satellite is it? State two of its applications? 4
Question 28-30 : Please answer in 10-12 lines.
Q28. List any three differences between mixtures and compounds and give examples of each. 6
Q29. (a) How are work and energy related? Mention unit of work.
(b) A stone of mass m is thrown straight up to a height h from the ground. What is its total energy at
(i) H = h
(ii) H = h/2
(iii) H = 0
(c) Write the inference you arrived at from the above. 6
Q30. What is meant by binomial nomenclature? Taking any two examples of living organisms justify the need for using binomial nomenclature. 6
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