Q.1. Which the unit is used to measure the atomic radius ? Convert this unit in metre.
Q.2. Write the charge and mass of an electron.
Q.3. Which type of disease causes more damage to our body – acute or chronic and why?
Q.4. State the conditions under which a body will sink or float in a fluid.
Q.5. On a cloudy day, the sound of thunder was heard 10 seconds after the flash of lightning. Find the distance of the clouds. Speed of the sound in air was 342 ms-1.
Q.6. An element ‘X’ forms the following compounds with hydrogen, carbon and phosphorus :
P2X3, P2X5, H2X2, H2X, CX2, CX. Find the valencies of ‘X’ and other element present in the compound.
Q.7. (a) Answer the following questions :
(i) Name the scientist who discovered protons.
(ii) What is the charge and mass of a proton ?
(iii) Where is proton located in an atom ?
(b)An atom of an element has mass number 28 u and its atomic number is 14. How many neutrons does it have ? Also name the element.
Q.8. Give reason for the following :
(a)lons are more stable than atoms.
(b)Noble gases show low reactivity.
(c) An atom is electrically neutral.
Q.9. Name the phylum to which the following organisms belong.
(a)Earthworm (b) Planaria
(c) Sycon (d) Starfish
(e) Housefly (f) Octopus
Q.10. What are viruses ? How do they multiply ? Why are antibiotics ineffective in case of viral diseases ?
Q.11. Classify the following organisms into their respective kingdoms as per Whittaker’s five kingdom classification :
Amoeba, Euglena, Birds, Herbs, Cats, Lactobacillus.
Q.12.A labourer whose own mass is 50 kg carries a load of an additional 60 kg on his head to the top of a building 15 m high. Find the total work done by him. Also find the work done by him if he carries another additional block of mass 10 kg to the same height. (Take g = 10 ms-2)
Q.13. Find the ratio of the pressure exerted by a block of 400 N when placed on a table top along its two different sides with dimensions 20 cm x 10 cm and 10 cm x 15 cm.
Q.14. (a) What type of waves are produced before actual earthquake ?
(b)Name two species of animals which can detect and produce these waves.
(c) What is the range of hearing for children under the age of five ?
Q.15. In a factory 10 bulbs of 50 W each and 5 fans of 70 W each operate for 12 hours daily. Calculate the units of electricity consumed. Also find the total expenditure if 1 unit costs X 2.
Q.16. Shyam goes to his office, which is 6 km from his house, by car pooling with a friend. His friend drives the car at the constant speed of 40km h-1.
(a) State values shown by Shyam and his friend ?
(b) Explain energy transformation takes place when fuel is burnt and car starts running ?
(c) State the advantage of driving the car at constant speed of 40km h-1.
Q.17. Elaborate the basic difference between the formula unit mass and the molecular mass. Write the formulae for calcium chloride, potassium nitrate and magnesium hydroxide and compute their molecular masses.
(Atomic masses Ca = 40 u, Cl = 35.5 u, K = 39 u, N = 14 u, O = 16 u,H – 1 u Mg 24 u)
Q.18. Draw a diagram of Euglena and label the following parts :
Flagellum, photoreceptor, eye spot, chloroplast, nucleus, contractile vacuole.
Q.19. Akhilesh is having headache and fever. He takes some pills to bring down the fever and headache before going to the doctor. What is this type of treatment called ? How can we reduce the effects of the disease ? What is the limitation of this type of treatment ? What is the possible remedy of these diseases ?
Q.20. (a) Can you listen the sound of a huge explosion taking place at moon ? State reason.
(b) Which physical principle is being made use of by a stethoscope ? How does stethoscope work ? Explain with the help of diagram. Explain any one other application based on the same principle.
Q.21. (a) Does the sound of an exploded cracker in air travel faster than the sound produced by a humming bee ? State reason.
(b)List the three characteristics of a sound wave and state the factors on which these depend.
(c) State the SI units of wavelength and frequency.
SECTION – B
Q.22. – Q.24. OTBA Questions of 10 marks.
Q23. While studying the laws of reflection of sound, 3 students used different, reflecting surfaces. The best result would be obtained by the student who used the reflecting surface :
(a)a thermocol sheet (b) a polished, plane metal sheet
(c) a rough cardboard sheet (d) a cushioned surface
Q.26. A student is doing an experiment to find the pressure exerted by an iron cuboid of mass 10 kg on ground as shown below (g = 10 ms-2):
The pressure exerted by the shaded portion of the cuboid when placed on the ground is (g = 10 ms-2)
(a)5 x 104 Pa (b) 2 x 104 Pa
(c) 4.5 x 104 Pa (d) 3 x 104 Pa
Q.27. We choose a slinky of larger length to perform experiment on speed of pulse because :(a) pulse cannot be formed on a short slinky.
(b) pulse can move easily in it.
(c) time taken to move from one end to another can accurately be determined.
(d) it is easier to perform.
Q.28. Which are the most primitive algae ?
(a) Red algae (b) Blue-green algae
(c) Green algae (d) Brown algae
Q.29. Four students P, Q, R and S carried out different chemicals reactions in the chemistry laboratory to verify the law of conservation of mass.
(P) Heated ferrous sulphate crystals in a China dish.
(Q) Added barium chloride solution of sodium sulphate solution in a sealed container.
(R) Passed carbon dioxide gas through lime water in a conical flask.
(S) Added dilute hydrochloric acid to Zinc granules in a test tube.
Which student will give the best result ?
(a) P (b) Q
(c) R (d) S
Q.30. 8.4 g of sodium carbonate was added to a solution of 20 g of ethanoic acid. The residue left behind weighed 24 g and the carbon dioxide released weighed 4.4 g. The above observation concludes.
(a) Law of conservation of mass (b) Law of constant composition
(c) Does not follow law of conservation of mass (d) None of these
Q.31. Leaves of which of the following plants has reticulate venation in their leaves as shown in figure below:
(a) Rose plant (b) Maize plant
(c) Grass (d) Wheat plant
Q.32. Observe the diagram alongside and identify it. It is :
(a) trimerous flower of monocotyledonous plant
(b) trimerous flower of dicotyledonous plant
(c) pentamerous flower of monocotyledonous plant
(d) pentamerous flower of dicotyledonous plant
33. Out of the following which organ is an adaptation in mosquitoes ?
(a) Having gills for respiration. (b) Having fins for movement,
(c) Having compound eye and antenna. (d) Having lungs for respiration
Q.34. A student notes down the observations in the two spring balances and the measuring cylinder as shown below. How much is the volume of the sol id ? Mass of the sol id is 60 g, then what will be the density of the material of the solid ?
Q.35. For performing an experiment to verify Archimedes’ Principle, a student used a spring balance to measure the weight of a solid as shown in figure. The solid was then lowered in water contained in a overflow-can and the water displaced by solid was collected in a : graduated cylinder as shown is figure.
Find the volume of the water displaced by the solid.
Q.36.Which characteristic feature of cockroach helps us to place it in its phylum ? How many legs are present in a cockroach ?