Q.1. How much work is done on a body of mass 1 kg whirling on a circular path of radius 5 m?
Q.2. Which will be chemically more reactive : element A with atomic number 17 or element B with atomic number 16?
Q.3. Name any two diseases against which you are vaccinated ?
Q.4. Do 5 moles of CO2 and 5 moles of H20 have same mass ?
Q.5. Why does a sharp needle pierce the skin easily than the blunt needle although the force applied on both the needles is same?
Q.6. Give one characteristics feature of the following :
(a)Arthropoda (b) Annelida (c) Mollusca.
Q.7. A girl having mass of 35 kg sits on a trolley of mass 5 kg. The trolley is given an initial velocity of 4 ms-1 by applying a force. The trolley comes to rest after travelling a distance of 16 m.
(a) How much work is done on trolley?
(b) How much work is done by the girl?
Q.8.(a) On a rainy day, flash of light and thunder are produced at the same time. Why is flash of light seen a few seconds earlier than hearing the thunder?
(b)Why does sound travels faster in summer season than in winter?
(c) A boy strikes one end of a long iron pipe with a rod. Another boy who keeps his ear close to the other end of the pipe hear two sounds in a short interval of time. Explain, why.
Q.9. (a) Why do parent’s immunise the new born baby?
(b) What are the ways to prevent mosquitoes from breeding?
Q.10. How does chemicals released by factories in water effect aquatic life?
Q.11. What is the audible range? What are infrasonic waves? What are ultrasonic waves ? What type of waves are produced by bats?
Q.12. (a) What do you think is the need of classification?
(b)What are the special features of ferns showing it is a pteridophyte?
Q.13. Give the chemical formula for the following combination and compute the ratio of mass of the constituent elements in each one of them :
(a)Water (b) Hydrogen chloride.
(c)Carbon monoxide (d) Aluminium fluoride
(e) Magnesium sulphate (f) Nitrogen dioxide
14.Complete the table :
Q.15. Calculate the number of moles of magnesium present in the magnesium ribbon weighting 12 g. Molar atomic mass of magnesium is 24 g mol-1 ?
Q.16. What are the observations and drawbacks of Rutherford’s model of atom?
Q.17. (a) State Pascal’s law?
(b) Define upthrust or buoyant force. Describe an activity to show that a body loses its weight when immersed in a liquid?
Q.18. Karuna is suffering from cholera. It is likely that the children sitting around her will be exposed to the infection.
(a)Do all the students get infected and suffer from disease?
(b)List two major symptoms of cholera .
(c) What are the different ways of spread of this disease?
Q.19. Enlist the important applications of radio isotopes.
Q.20. Define energy. Give and define S! unit of energy. List its different forms. A moving body of mass 20 kg has 40 joules of kinetic energy. Calculate the speed.
Q.21. Tabulate the differences between five classes of vertebrata.
SECTION – B
Q.22. – Q.24. OTBA Questions of 10 marks.
SECTION – C
Q.25.. In an experiment a piece of stone surrounded by ice on all sides is floating in a beaker containing 1 water up to a certain level. When the ice melts, the water level in the breaker wi
(a) first decrease and then increase (b) remain same
(c) decrease (d) increase
Q.26. In an experiment two balls, one of iron and other aluminium experience same upthrust when dipped in water.
(a)both have equal density (b) nothing definite can be said
(c)both have equal weight in air (d) both have equal volume
Q.27. In an experiment the floating body displaces its own :
(a)volume of liquid (b) mass of liquid
(c) weight of liquid (f) none of these
Q.28. In an experiment two impulses in a stretched string whose centres are initially 8 cm apart are moving towards each other as shown. The speed of each impulse is 2 cm s~1. After 2 seconds, the total energy of the pulse will be :
(a)partially kinetic and partially potential
Q.29.In an experiment rectangular iron block is kept over a table with different faces touching the table. In different cases, block exerts:
(a)different thrust and different pressure
(b)different thrust and same pressure
(c)same thrust and different pressure
(d) same thrust and same pressure
Q.31.The mass of a solid iron cube of side 4 cm is to be determined. Of the 4 spring balances available, the one best suited for this purpose would be having :
(a)range = 0 to 100g, least count = 1 g
(b)range = 0 to 100 g, least count = 5 g
(c)range = 0 to 1000 g, least count = 10 g
(d) range = 0 to 1000 g, least count = 25 g
Q.32. Foot, seta and capsule are part of:
(a) Funaria (b) Riccia
(c) Agaricus (d) Moss
Q.33. Ferns are said to be ornamental plants due to :
(a) roots (b) stems
(c) leaves (d) all of these
Q.34. Name the group of plants having naked seeds. Write any other salient feature.
Q.35. Find the ratio by mass of elements present in molecule of ammonia (NF13). Given atomic mass of N = 14 u, H = 1 u.
Q.36. Write any two desirable features of a spring balance.