1.
Name the Indian philosopher who proposed the theory
of matter.
2. What is Dalton?
3. Define 1 watt of power.
4. Will advanced organisms be the same as complex orga nisms? Why?
5. Why are sound waves called mechanical waves?
6. List any three human activities which would lead to an increase in the carbon dioxide content of air.
7. What happens when sound travels in air?
8. Differentiate between Potential and kinetic energy?
9. How can ultrasound be used to detect the defect in metal block?
10. Write the postulates of Bohr theory?
11. Write the distribution of electrons in carbon and s odium atoms.
12. Write characteristics of angiosperms.
13. What precautions can you take in your school to red uce the incidence of infectious diseases?
14. The kinetic energy of an object of mass, m moving w ith a velocity of 5 ms −1 is 25 J. What will be its kinetic energy when its velocity is doubled? What will be its kinetic energy when its velocity is increased three times?
15. What is a sound board? Explain the working of a sou ndboard with the help of a labelled diagram.
17. The number of dengue cases had increased in Pooja’s village in last one year. She has studied that diseases like dengue spread through mosquitoes which breed in stagnant water. She immediately suggested her friends and decided to ki ll the mosquitoes in water bodies in the locality. They also took help of nearest municipal office.
Answer the following questions based on above infor mation: (i) Which preventive measures do you suggest for th e prevention of such diseases caused by mosquitoes? Mention any two measures.
(ii) Which values are displayed by Pooja in taking initiative?
(iii) Suggest one school activity to promote such v alues in school students.
18. We know that many human activities lead to increasi ng levels of pollution of the air, water- bodies and soil. Do you think that isolating these activities to specific and limited areas would help in reducing pollution?
19. The body of a patient has lost its power of fightin g against infections. Which disease may the patient be suffering from? Name the pathogen and de scribe any two modes of its transmission from the patient to other person.
21. Briefly describing the gravitational potential ener gy, deduce an expression for the gravitational potential energy of a body of mass m placed at a height h, above the ground.
22. What are the failures of Dalton Atomic theory?
23. Explain how the human ear works.
24. ‘Water is essential for the sustenance of life’ Jus tify the statement.
2. What is Dalton?
3. Define 1 watt of power.
4. Will advanced organisms be the same as complex orga nisms? Why?
5. Why are sound waves called mechanical waves?
6. List any three human activities which would lead to an increase in the carbon dioxide content of air.
7. What happens when sound travels in air?
8. Differentiate between Potential and kinetic energy?
9. How can ultrasound be used to detect the defect in metal block?
10. Write the postulates of Bohr theory?
11. Write the distribution of electrons in carbon and s odium atoms.
12. Write characteristics of angiosperms.
13. What precautions can you take in your school to red uce the incidence of infectious diseases?
14. The kinetic energy of an object of mass, m moving w ith a velocity of 5 ms −1 is 25 J. What will be its kinetic energy when its velocity is doubled? What will be its kinetic energy when its velocity is increased three times?
15. What is a sound board? Explain the working of a sou ndboard with the help of a labelled diagram.
17. The number of dengue cases had increased in Pooja’s village in last one year. She has studied that diseases like dengue spread through mosquitoes which breed in stagnant water. She immediately suggested her friends and decided to ki ll the mosquitoes in water bodies in the locality. They also took help of nearest municipal office.
Answer the following questions based on above infor mation: (i) Which preventive measures do you suggest for th e prevention of such diseases caused by mosquitoes? Mention any two measures.
(ii) Which values are displayed by Pooja in taking initiative?
(iii) Suggest one school activity to promote such v alues in school students.
18. We know that many human activities lead to increasi ng levels of pollution of the air, water- bodies and soil. Do you think that isolating these activities to specific and limited areas would help in reducing pollution?
19. The body of a patient has lost its power of fightin g against infections. Which disease may the patient be suffering from? Name the pathogen and de scribe any two modes of its transmission from the patient to other person.
21. Briefly describing the gravitational potential ener gy, deduce an expression for the gravitational potential energy of a body of mass m placed at a height h, above the ground.
22. What are the failures of Dalton Atomic theory?
23. Explain how the human ear works.
24. ‘Water is essential for the sustenance of life’ Jus tify the statement.
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