1.
What is meant by water table?
2. Name the second member of alkynes family Give its s tructure?
3. What is the focal length of a lens, whose power is given as +2.0 D?
4. Why does it take some time to see objects in dim li ght when you enter the room from bright sunlight outside?
5. Explain why atomic number is more important than at omic weight in determining chemical properties?
6. Mention any four details that can be inferred about organisms from their fossils.
7. An object of size ' ' l cm is placed in front of a (i) convex mirror and
( ii) concave mirror. With a neat ray-diagram, explain how an erect image is for med.
8. (i) Is the speed of light a constant?
(ii) Which colour has the greatest speed in the vi sible region?
(iii) Is it possible to combine the seven colours i n the spectrum to form white?
9. A mother always wants her child to drink milk. As i t is a boon for health. If one do not drink milk, he can face severe health problems. Answer the following questions on the basis of abov e text.
(a) Name the major constituent / nutrient present in th e milk.
(b) Write the chemical symbol, atomic number and valenc y of that nutrient.
c) What value do you infer from the given text?
10. What is presbyopia? What causes presbyopia? How is presbyopia corrected?
11. Energy transfer is said to be unidirectional where as biochemical transfer is said be cyclic. Why?
12. List any three measures of the projection of wildli fe.
13. What is electron affinity? The electron affinity va lues of three elements A, B and C of a group are 324, 295 and 333 kJ mol . Arrange these in increasing order of their atomic numbers.
14. What were the criteria used by Mendeleev in creatin g his Periodic Table?
15. Differentiate between ‘Self pollination’ and ‘Cross pollination’. Describe double fertilization in plants.
16. Draw a labeled diagram of the longitudinal section of a flower.
17. How are fossils formed?
18. How has the method of ‘artificial selection’ by hum ans helped in the evolution of different vegetables?
19. Explain: (i) Analogous organs
(ii) Natural selecti on
Or What are homologous organs? How do they differ from analogous organ? How does the study of comparative anatomy provide evidence in favour o f Organic Evolution?
20. An object 5 cm in length is held 25 cm away from a converging lens of focal length 10 cm. Draw the ray diagram and find the position, size and the nature of the image formed.
Or (i) State the basic laws of refraction.
(ii) Describe about refractive index.
(iii) Does the incident and emergent ray coincide in a gl ass slab refraction? Give reason.
21. Explain how the ray of white light is dispersed. Wh y does this take place? Which colour deviates more and why?
Or What is long-sightedness? List two causes for devel opment of long-sightedness. Describe with the ray diagram, how this effect may be corrected b y using spectacles.
22. (a) Why does carbon form largest number of compounds ?
(b) Why are some of these called saturated and othe r unsaturated compounds?
(c) Which of these two is more reactive?
(d) Write the names of the following compounds
Or (a) Write the name and symbol of group 17 elements belo nging to second period.
(b) Write electronic configuration of K (19). To which group of periodic table does it belong?
(c) What are substitution reactions? Give one example.
(d) What happens when acetic acid reacts with sodium bi carbonate? Give chemical reaction involved.
(e) Why does carbon form covalent bond?
23. (a) Name two elements of group 13.
(b) Name most electro-negative element in periodic table. Write its atomic number.
(c) Draw electron dot structures of (i) H2O, (ii) C H4, (iii) NH3, (iv) BF3
(d) Differentiate between ores and minerals.
Or
(a) Name elements of group 2 belonging to 3 rd and 4 th period.
(b) Name the element having highest ionization energy i n periodic table.
(c) Give limitation of Dobereiner’s law of triads.
(d) Why do ionic compounds not conduct electricity in s olid state?
(e) Name the chief ore or iron. Give its formula.
24. Name two bacterial diseases which are sexually tran smitted. Name their causal organisms, symptoms and preventive measures.
Or What are the advantages and disadvantages of self a nd cross pollination? Which of them is better and why?
2. Name the second member of alkynes family Give its s tructure?
3. What is the focal length of a lens, whose power is given as +2.0 D?
4. Why does it take some time to see objects in dim li ght when you enter the room from bright sunlight outside?
5. Explain why atomic number is more important than at omic weight in determining chemical properties?
6. Mention any four details that can be inferred about organisms from their fossils.
7. An object of size ' ' l cm is placed in front of a (i) convex mirror and
( ii) concave mirror. With a neat ray-diagram, explain how an erect image is for med.
8. (i) Is the speed of light a constant?
(ii) Which colour has the greatest speed in the vi sible region?
(iii) Is it possible to combine the seven colours i n the spectrum to form white?
9. A mother always wants her child to drink milk. As i t is a boon for health. If one do not drink milk, he can face severe health problems. Answer the following questions on the basis of abov e text.
(a) Name the major constituent / nutrient present in th e milk.
(b) Write the chemical symbol, atomic number and valenc y of that nutrient.
c) What value do you infer from the given text?
10. What is presbyopia? What causes presbyopia? How is presbyopia corrected?
11. Energy transfer is said to be unidirectional where as biochemical transfer is said be cyclic. Why?
12. List any three measures of the projection of wildli fe.
13. What is electron affinity? The electron affinity va lues of three elements A, B and C of a group are 324, 295 and 333 kJ mol . Arrange these in increasing order of their atomic numbers.
14. What were the criteria used by Mendeleev in creatin g his Periodic Table?
15. Differentiate between ‘Self pollination’ and ‘Cross pollination’. Describe double fertilization in plants.
16. Draw a labeled diagram of the longitudinal section of a flower.
17. How are fossils formed?
18. How has the method of ‘artificial selection’ by hum ans helped in the evolution of different vegetables?
19. Explain: (i) Analogous organs
(ii) Natural selecti on
Or What are homologous organs? How do they differ from analogous organ? How does the study of comparative anatomy provide evidence in favour o f Organic Evolution?
20. An object 5 cm in length is held 25 cm away from a converging lens of focal length 10 cm. Draw the ray diagram and find the position, size and the nature of the image formed.
Or (i) State the basic laws of refraction.
(ii) Describe about refractive index.
(iii) Does the incident and emergent ray coincide in a gl ass slab refraction? Give reason.
21. Explain how the ray of white light is dispersed. Wh y does this take place? Which colour deviates more and why?
Or What is long-sightedness? List two causes for devel opment of long-sightedness. Describe with the ray diagram, how this effect may be corrected b y using spectacles.
22. (a) Why does carbon form largest number of compounds ?
(b) Why are some of these called saturated and othe r unsaturated compounds?
(c) Which of these two is more reactive?
(d) Write the names of the following compounds
Or (a) Write the name and symbol of group 17 elements belo nging to second period.
(b) Write electronic configuration of K (19). To which group of periodic table does it belong?
(c) What are substitution reactions? Give one example.
(d) What happens when acetic acid reacts with sodium bi carbonate? Give chemical reaction involved.
(e) Why does carbon form covalent bond?
23. (a) Name two elements of group 13.
(b) Name most electro-negative element in periodic table. Write its atomic number.
(c) Draw electron dot structures of (i) H2O, (ii) C H4, (iii) NH3, (iv) BF3
(d) Differentiate between ores and minerals.
Or
(a) Name elements of group 2 belonging to 3 rd and 4 th period.
(b) Name the element having highest ionization energy i n periodic table.
(c) Give limitation of Dobereiner’s law of triads.
(d) Why do ionic compounds not conduct electricity in s olid state?
(e) Name the chief ore or iron. Give its formula.
24. Name two bacterial diseases which are sexually tran smitted. Name their causal organisms, symptoms and preventive measures.
Or What are the advantages and disadvantages of self a nd cross pollination? Which of them is better and why?
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