Question

9th class 2018 biology question Paper of SA-1

Answer 1

    



Central Board of Secondary
Q.1 If the distance between two points’ masses is doubled, what will happen to the gravitational force of attraction between them? [1]Q.2 Which would require a greater forte -accelerating a 2Kg mass at 5m/s2 or a 5 kg mass at 3m/s2. [2]Q.3 List differences between mass and weight. [2]Q.4 Youstand at the main gate of your house The Ice-cream parlourIs 10m sway from the main gate You walk to the Ice –cream parlour and come back again? [3]
(a) What is the distance you have walked?
(b) What is your final displacement?
(c) Is displacement equal to distance? Give a reason for your answer?Q.5 State Newton’s second law of motion.Derive mathematical formulation of Newton’, second law of motion. [3]Q.6 Two stones A and B are dropped from a millstone budding A is dropped from 100 m and after some time B is dropped from 50 m height. Both of them reach the earth at the same time. Will they have equal velocity while reaching the ground? Calculate and find out the answer (take g = 10 m/s2 ) [3]

Q.7. Use velocity time graph to derive graphically the equation for position-time relation for an object travelling a distance(s) under

(i) Calculate force acting on the car in first 4 second.
(ii) Calculate retardation.
(iii) For which time interval is there no force acting. [5]

Q.10. Choose the correct option : [3]



Section B

Q.1. Define latent heat of vaporization. Why does the temperature not change during the change of state from solid to liquid? [2]

Q.2. Give three reasons to suggest that bronze is a mixture, not a compound. [3]

Q.3. (a) Which is more effective in cooling, ice at 273K or water at the same temperature? Give reason.

(b) State two reasons to prove that water is a liquid at room temperature. [3]

Q.4. Why does evaporation cause cooling? State and explain any two factors which increase the rate of evaporation. [3]

Q.5. (a) 15 g of common salt are dissolved in water. The solution was found to weigh 115g. Calculate the mass by mass percentage of common salt in the solution.

(b) Compare the true solution, colloidal solution and suspension on the basis of particle size and stability. [2+3=5]

Q.6. (a) Name the process used to separate a mixture of acetone and water. [1+1+3=5]
(b) Give the principle of this process.
(c) Draw a labeled diagram of the process to show the separation of the above mixture.

Multiple Choice Questions

Q.7. Four students A, B, C and D were given: (i) milk, (ii) blood, (iii) sugar solution, (iv) egg albumin in water respectively. They were asked to centrifuge their solutions. In some cases particles settled on centrifugation. The correct reporting of settled particles was done by [1]

(a) A and B
(b) A, B and C
(c) B, C and D
(d) A, B and D

Q.8. When iron fillings and sulphur taken in a test tube are heated then [1]

(a) ironsulphide will be formed with residue
(b) A yellow colour solution is obtained
(c) Sulphur turns into vapour
(d) Sulphur dioxide gas Is evolved

Q.9. To test the Ignition of magnesium, it is taken as [1]

(a) Ribbon
(b) Fillings
(c) Strips
(d) Granules

Q.10 Ammonium chloride was separated from sand by sublimation. The material left behind in the china dish is called [1]
(a) Residue
(b) A non – sublimate
(c) A decomposed matter
(d) All the above

Q.11 (i) Identify the correct combination of methods to separate a mixture of sand, common salt and ammonium chloride. [2]
(a) Magnetic separation and filtration
(b) Sublimation and separating funnel
(c) Magnetic separation and sublimation
(d) Evaporation and sublimation
(ii) What is the difference between evaporation and sublimation?

Q.12 When ice is added to water in a beaker [2]
(a) It floats on the surface
(b) It melts
(c) It takes heat from water
(d) All the above
Why are water droplets seen on the outer surface of the beaker in the above case?

SECTION – ‘C’

Q.1 What will happen if the medium has a lower concentration of water than the cell? [1]

Q.2 Name two cropping patterns to give maximum benefit in crop production? [1]

Q.3 (a) Draw a labeled diagram (longitudinal section) of collenchyma tissue [3]
(b) In what one way they differ from parenchyma?

Q.4 Differentiate between striated, unstrained and cardiac muscles on the basis of their structure and location in the body. [3]

Q.5 what are? [3]
(i) Compost
(ii) vermicompost
(iii) green manure

Q.6 (a) “Removal of weeds from cultivated fields during the early stages of crops is essential for a good harvest” Justify the statement. [3]
(b) Mention any 2 methods of weed control

Q.7(a) List any two desirable characters of bee varieties suitable for honey production [3]
(b) What is the biological name of Italian honey bee?