1.
Give one word for the following:
(i) Positively charged ion
(ii) A group of atoms carrying a charge
2. Write the atomicity of the following molecules:
(i) H S04
(ii) CCI4
3. Name the two common forms of mechanical energy.
4. (i) State reasons why Echidna and platypus lay eggs
but are considered as mammals. (ii) Forelimbs of birds are modified.
5. What is sound and how is it produced?
6. When we breathe in air, nitrogen also goes inside a long with oxygen. What is the fate of this nitrogen?
7. A sound wave of wavelength 0.332 m has a time perio d of 10 -3 s. If the time period is decreased to 10 -4 s, calculate the wavelength and frequency of new w ave.
8. What are the various energy transformations that oc cur when you are riding a bicycle?
9. How does the sound produced by a vibrating object i n a medium reach your ear?
10. What are the limitations of Rutherford’s model of t he atom?
11. Explain the variation of atomic radius along a peri od and down a group.
12. Give difference between vertebrates and invertebrat es.
13. ‘Public cleanliness is important for individual hea lth’. Comment.
14. Illustrate the law of conservation of energy by dis cussing the energy changes which occur when we draw a pendulum bob to one side and allow i t to oscillate. Why does the bob eventually come to rest? What happens to its energy eventually? Is it a violation of the law of conservation of energy?
15. An observer far away from a railway station hears t he train starting. The sound arrives both from the steel rails and through air with a time di fference of 3.5s. How far is the railway station from the observer? The speed of sound in air and st eal is 340m/s and 5130m/s respectively?
16. What do you understand by the units of electrical e nergy? How many joules of energy is consumed if the electrical meter shows 400 units of energy?
17. Naveen was suffering from respiratory disorder sinc e long time. His daughter Sarika took him to a doctor. After studying his case, the doctor ca me to know that Naveen was residing near a very busy road.
(i) What could be the possible reason for Naveen’s respiratory disorder?
(ii) Which major pollutants are present in exhaust of vehicles?
(iii) Write the preventive measures that should be taken.
18. Give reasons why:
(a) step farming is common in hills.
(b) fertile soil has lot of humus.
19. Becoming exposed to or infected with an infectious microbe does not necessarily mean developing noticeable disease. Explain.
20. (a) Write any four features that all chordates poss ess.
(b) Explain the three basic features for grouping a ll organisms into five major kingdoms.
21. (a) Define kinetic energy of an object. Can kinetic energy of an object be negative? Give reason.
(b) A car weighing 1200 kg is uniformly accelerated from rest and covers a distance of 40 m in 5 sec. calculate the work, the car engine had to do during this time.
22. (a) What is an octet? How do elements reach an octe t?
(b) Make a schematic atomic structure of Magnesium or phosphorus. (Given: number of protons of Magnesium=12, Phosphorus=15)
23. (a) What are the characteristics of sound waves?
(b) An echo is heard after 3 s. what is the distanc e of reflecting surface from the source given that the speed of sound is 342 ms -1 ?
(c) What is SONAR? Write its full form.
24. How are living organisms dependent on the soil? Are organisms that live in water totally independent of soil as a resource?
(i) Positively charged ion
(ii) A group of atoms carrying a charge
2. Write the atomicity of the following molecules:
(i) H S04
(ii) CCI4
3. Name the two common forms of mechanical energy.
4. (i) State reasons why Echidna and platypus lay eggs
but are considered as mammals. (ii) Forelimbs of birds are modified.
5. What is sound and how is it produced?
6. When we breathe in air, nitrogen also goes inside a long with oxygen. What is the fate of this nitrogen?
7. A sound wave of wavelength 0.332 m has a time perio d of 10 -3 s. If the time period is decreased to 10 -4 s, calculate the wavelength and frequency of new w ave.
8. What are the various energy transformations that oc cur when you are riding a bicycle?
9. How does the sound produced by a vibrating object i n a medium reach your ear?
10. What are the limitations of Rutherford’s model of t he atom?
11. Explain the variation of atomic radius along a peri od and down a group.
12. Give difference between vertebrates and invertebrat es.
13. ‘Public cleanliness is important for individual hea lth’. Comment.
14. Illustrate the law of conservation of energy by dis cussing the energy changes which occur when we draw a pendulum bob to one side and allow i t to oscillate. Why does the bob eventually come to rest? What happens to its energy eventually? Is it a violation of the law of conservation of energy?
15. An observer far away from a railway station hears t he train starting. The sound arrives both from the steel rails and through air with a time di fference of 3.5s. How far is the railway station from the observer? The speed of sound in air and st eal is 340m/s and 5130m/s respectively?
16. What do you understand by the units of electrical e nergy? How many joules of energy is consumed if the electrical meter shows 400 units of energy?
17. Naveen was suffering from respiratory disorder sinc e long time. His daughter Sarika took him to a doctor. After studying his case, the doctor ca me to know that Naveen was residing near a very busy road.
(i) What could be the possible reason for Naveen’s respiratory disorder?
(ii) Which major pollutants are present in exhaust of vehicles?
(iii) Write the preventive measures that should be taken.
18. Give reasons why:
(a) step farming is common in hills.
(b) fertile soil has lot of humus.
19. Becoming exposed to or infected with an infectious microbe does not necessarily mean developing noticeable disease. Explain.
20. (a) Write any four features that all chordates poss ess.
(b) Explain the three basic features for grouping a ll organisms into five major kingdoms.
21. (a) Define kinetic energy of an object. Can kinetic energy of an object be negative? Give reason.
(b) A car weighing 1200 kg is uniformly accelerated from rest and covers a distance of 40 m in 5 sec. calculate the work, the car engine had to do during this time.
22. (a) What is an octet? How do elements reach an octe t?
(b) Make a schematic atomic structure of Magnesium or phosphorus. (Given: number of protons of Magnesium=12, Phosphorus=15)
23. (a) What are the characteristics of sound waves?
(b) An echo is heard after 3 s. what is the distanc e of reflecting surface from the source given that the speed of sound is 342 ms -1 ?
(c) What is SONAR? Write its full form.
24. How are living organisms dependent on the soil? Are organisms that live in water totally independent of soil as a resource?
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ReplyDeleteGlobal Studies solution. The Class 9 English Assignment along with other two subject will be published in later week. class 9 assignment 2021 answer
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