1.
Give an example of a tri-atomic molecule of an elem
ent.
2. Valency of an element X is 3. Write the chemical fo rmula of its oxide.
3. What is negative work.
4. Why do we keep both snake and turtle in the same cl ass?
5. Why is sound wave called a longitudinal wave?
6. How does the temperature of Earth’s atmosphere rema in fairly uniform during the day?
7. A sound wave has a frequency 2 kHz and wavelength 4 0 cm. How long will it take to travel 1.6 km?
8. Define potential energy? What are different types o f potential energy?
9. What are wavelength, frequency, time period of a so und wave?
10. Compare the properties of electrons, protons and ne utrons.
11. List any three distinguishing features between the models of an atom proposed by J.J. Thomson and Ernest Rutherford.
12. Write characteristics of kingdom Animalia.
13. Give an example where tissue specificity of the inf ection leads to very general seeming effects.
14. Derive an expression for the potential energy of th e body. Calculate P.E of body of mass 10Kg at a height of 10m.
15.Sound waves of wavelength λ travel from a medium in which its velocity is v m/ s into another medium in which if velocity is 3 v m/s. What is the wavelength of the sound λ in the second medium?
16.Derive the formula for kinetic energy
17. In a school assembly, the students were asked to we ar full sleeves shirts, full pants and socks pulled till knees, use mosquitoes repellants cream during day time.
(i) Name the disease, about which preventive instru ction are given in the assembly.
(ii) Name the vector of this disease.
(iii) Give two preventive environmental measures.
(iv) Which two values were given in assembly relate d to society?
18. Why does Mathura refinery pose problem to Taj Mahal ?
19. What precautions will you take to justify “preventi on is better than cure”.
20. (i) State two basis of classifying plants and anima ls into different categories.
(ii) List three characteristics features of fungi.
(iii) Some fungal species live in permanent, mutual ly dependent relationships with cyanobacteria.
What is this relationship called? Where are they fo und?
21. What do you mean by work? Give an example of negati ve work done? What is the work to be done to increase the velocity from 18km/hr to 19km/ hr, if the mass of the car is 2000 Kg.
22. (a) Why is the ceiling and wall behind the stage of good conference halls or concert halls made curved?
(b) Which property of sounds leads to the formation of echoes? Briefly explain.
(c) What is reverberation? What will happen if the reverberation time in a big hall is too long? How can we reduce it?
23. A person standing between two vertical cliffs and 6 40 m away from the nearest cliff shouted. He heard the first echo after 4 seconds and the sec ond echo 3 seconds later. Calculate
(i) the velocity of sound in air, and
(ii) the distance between the cliffs.
24. “Soil is formed by water.” If you agree to this sta tement then give reasons for your answer.
2. Valency of an element X is 3. Write the chemical fo rmula of its oxide.
3. What is negative work.
4. Why do we keep both snake and turtle in the same cl ass?
5. Why is sound wave called a longitudinal wave?
6. How does the temperature of Earth’s atmosphere rema in fairly uniform during the day?
7. A sound wave has a frequency 2 kHz and wavelength 4 0 cm. How long will it take to travel 1.6 km?
8. Define potential energy? What are different types o f potential energy?
9. What are wavelength, frequency, time period of a so und wave?
10. Compare the properties of electrons, protons and ne utrons.
11. List any three distinguishing features between the models of an atom proposed by J.J. Thomson and Ernest Rutherford.
12. Write characteristics of kingdom Animalia.
13. Give an example where tissue specificity of the inf ection leads to very general seeming effects.
14. Derive an expression for the potential energy of th e body. Calculate P.E of body of mass 10Kg at a height of 10m.
15.Sound waves of wavelength λ travel from a medium in which its velocity is v m/ s into another medium in which if velocity is 3 v m/s. What is the wavelength of the sound λ in the second medium?
16.Derive the formula for kinetic energy
17. In a school assembly, the students were asked to we ar full sleeves shirts, full pants and socks pulled till knees, use mosquitoes repellants cream during day time.
(i) Name the disease, about which preventive instru ction are given in the assembly.
(ii) Name the vector of this disease.
(iii) Give two preventive environmental measures.
(iv) Which two values were given in assembly relate d to society?
18. Why does Mathura refinery pose problem to Taj Mahal ?
19. What precautions will you take to justify “preventi on is better than cure”.
20. (i) State two basis of classifying plants and anima ls into different categories.
(ii) List three characteristics features of fungi.
(iii) Some fungal species live in permanent, mutual ly dependent relationships with cyanobacteria.
What is this relationship called? Where are they fo und?
21. What do you mean by work? Give an example of negati ve work done? What is the work to be done to increase the velocity from 18km/hr to 19km/ hr, if the mass of the car is 2000 Kg.
22. (a) Why is the ceiling and wall behind the stage of good conference halls or concert halls made curved?
(b) Which property of sounds leads to the formation of echoes? Briefly explain.
(c) What is reverberation? What will happen if the reverberation time in a big hall is too long? How can we reduce it?
23. A person standing between two vertical cliffs and 6 40 m away from the nearest cliff shouted. He heard the first echo after 4 seconds and the sec ond echo 3 seconds later. Calculate
(i) the velocity of sound in air, and
(ii) the distance between the cliffs.
24. “Soil is formed by water.” If you agree to this sta tement then give reasons for your answer.
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