i-Tutor Term Test-6

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i-Tutor Term Test-6A Science-CBSE (Class IX)

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M.M. : 80 i-Tutor Term Test-6 Time : 3 Hrs. Science-CBSE (Class IX)

(i) The question paper comprises three sections A, B and C. You are to attempt all the sections.

(ii) All questions are compulsory.

(iii) Section A comprises of 20 questions (10 VSA, 8 MCQ and 2 AR Type) of 1 mark each. Section B comprises of 10 questions of 3 marks each. Section C comprises of 6 questions of 5 marks each.

(iv) There is no overall choice in the paper. However, internal choice is provided in 3 questions of 1 mark, 2 questions of 3 marks, 2 questions of 5 marks.

(v) Use of calculator is not permitted.

(vi) It is mandatory to use Blue/Black Ballpoint Pen to write the answer.

SECTION – A

Very Short Answer Type Questions : [10×1=10] 1. Define immunity. [1]

2. Define ecology. [1]

3. Push a pebble lying on a surface. The pebble moves through a distance. You exerted a force on the pebble and the pebble got displaced. In this situation work is done. A girl pulls a trolley and the trolley moves through a distance. The girl has exerted a force on the trolley and it is displaced. Therefore, work is done. Lift a book through a height. To do this you must apply a force. The book rises up. There is a force applied on the book and the book has moved. Hence, work is done. A closer look at the above situations reveals that two conditions need to be satisfied for work to be done: (i) a force should act on an object, and (ii) the object must be displaced.

(a) Can work done by external force on an object be negative? [1]

(b) Write the SI unit of energy. [1]

(c) Write two conditions needs to be satisfied for work. [1]

(d) Define power. [1]

Topics Covered : Physics : Complete Syllabus of Module-II (Excluding the Topics/chapters Deleted by CBSE)

Chemistry : Complete Syllabus of Module-II (Excluding the Topics/chapters Deleted by CBSE)

Biology : Complete Syllabus of Module-II (Excluding the Topics/chapters Deleted by CBSE)

Code A Date : 24-01-2021

GENERAL INSTRUCTIONS :

Science-CBSE (Class IX) i-Tutor Term Test-6A

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4. Answer question numbers 4(a) to (4d) on the basis of your understanding of following paragraph and the related studied concepts.

Noble gases have eight electrons in their outer-most shell except helium. Other elements have less than eight electrons, to complete their octet they either lose or gain electrons. This way a new species is formed.

(a) What are ions? [1] (b) Write the different types of ions. [1] (c) Write the symbol of noble gas element having atomic number 10 and 18 respectively. [1]

(d) Write the electronic configuration of Ca2+. [1] Multiple Choice Type Questions : [8×1=8] 5. A flying bird has [1] (1) Potential energy (2) Kinetic energy (3) Both (1) and (2) (4) Neither kinetic energy nor potential energy 6. When time taken to complete a given amount of work increases, then [1] (1) Power decreases (2) Energy increases (3) Power increases (4) Energy decreases 7. Which of the following is an example of elastic potential energy? [1] (1) Electric cell (2) Moving car (3) Free fall object (4) Wrist watch

OR In which of the following electrical devices, the electrical energy is converted into mechanical energy? [1] (1) T.V. (2) Radio (3) Electric motor (4) Electric bulbs 8. The ratio by number of atoms for carbon and oxygen in carbon dioxide is [1] (1) 2 : 1 (2) 3 : 8 (3) 8 : 3 (4) 1 : 2

OR Helium is a [1] (1) Polyatomic gas (2) Diatomic gas (3) Tetra-atomic gas (4) Monoatomic gas 9. Which of the following is used as a fuel in nuclear reactors? [1] (1) U-235 (2) Co-60 (3) P-32 (4) I-131 10. How many diseases in the box given below are caused by bacteria? [1]

(1) Four (2) Five (3) Two (4) Three 11. Which of the following statements is false about soil pollution? [1] (1) Excessive irrigation could lead to salination of soil (2) The pesticides could change the chemical nature of the soil (3) The industrial discharge on grounds lead to soil pollution (4) Excess use of fertilizers increases soil fertility

Tuberculosis, Malaria, Anthrax, Dengue, Athlete 's foot, Cholera

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12. The concentration of carbon dioxide in the atmospheric air is [1] (1) 0.03% (2) 0.93%

(3) 20.94% (4) 15.34%

OR Which of the following bacteria converts the nitrates into gaseous nitrogen? [1] (1) Nitrosomonas

(2) Pseudomonas

(3) Putrefying bacteria

(4) Nitrobacter

Assertion & Reason Type Questions : [2×1=2] In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R).

(1) Both (A) and (R) are true and (R) is the correct explanation of (A)

(2) Both (A) and (R) are true but (R) is not the correct explanation of (A)

(3) (A) is true but (R) is false

(4) (A) is false but (R) is true

13. A : Symbol of silver and tin is Ag and Sn respectively. [1] R : Silver is a metal but tin is not a metal.

14. A : The antibiotic penicillin blocks the bacterial processes that build the cell wall. [1] R : Penicillin cannot have such effect on humans as they have cell wall.

SECTION – B

Short Answer Type Questions : [10×3=30] 15. A boy weighing 35 kg carries a bag of 15 kg climbs stairs in 5 s. If there are 12 steps in the stairs, each of

15 cm height. Calculate the power of the boy. [Take g = 10 m/s2] [3] 16. Define kinetic energy and derive the relation between momentum and kinetic energy. [3] 17. (i) What is the commercial unit of electrical energy? [1] (ii) A bulb of power 400 W works for 8 hours daily. Calculate the total units of commercial electrical energy

consumed in 15 days. [2] OR

(i) Derive the mathematical relation for work done (W), when a force (F) is acting on the object in the direction opposite to its displacement (s). [1½]

(ii) Calculate the work done by gravity on an object of mass 5 kg slowly moving down a smooth incline of height 10 m and of inclination 30°. [Take g = 10 m/s2] [1½]

18. Define the following term

(i) Positive work [1] (ii) Chemical energy [1] (iii) Mechanical energy [1] 19. Obtain the chemical formula of

(i) Potassium dichromate [1] (ii) Calcium carbonate [1] (iii) Aluminium sulphate [1]

Science-CBSE (Class IX) i-Tutor Term Test-6A

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OR

Compute the formula unit mass of (i) NaNO3 [1]

(ii) CaCl2 [1]

(iii) MgO [1]

20. (i) Find the average atomic mass of an element X if the element is available in its two isotopic forms 23X(80%) and 25X (20%). [2]

(ii) Write any two isotopes of hydrogen. [1]

21. Name the element and write its symbol whose 1 atom weighs 3.984 × 10–23 g and also write the chemical formula of its chloride. [3]

22. (i) An individual ‘X’ is suffering from a disease ‘Y’ caused by Enterovirus. Identify the disease ‘Y’. [1] (ii) Write any four symptoms of the above mentioned disease. [2] 23. Explain the harmful effects of the following. (i) Acid rain [1] (ii) Smog [1] (iii) SPM [1] 24. (i) Write down the full name of AIDS. [1] (ii) Give any four modes of transmission of AIDS. [2]

OR Give any three symptoms of AIDS. [3]

SECTION – C

Long Answer Type Questions : [6×5=30] 25. (i) Deduce the unit of kinetic energy of a body using the expression for work done by a constant force acting

on it. [2] (ii) A block of mass 10 kg slides on a horizontal road against friction with initial speed 216 km/h. If it stops

finally, then evaluate the work done by friction? [2] (iii) Why is the work done by a coolie carrying a heavy load and moving horizontally is zero? [1]

OR Verify the principle of conservation of mechanical energy by taking example of a body in free fall. [5] 26. (i) What kind of energy transformation takes place in the following gadgets. [3] (a) Steam engine (b) Electric heater (c) Electric bulb (ii) Derive an expression for gravitational potential energy. [2] 27. Calculate the number of atoms in each of the following : (i) 23 g of Na atoms [1] (ii) 14 g of N2 molecule [2]

(iii) 0.2 mole of CH4 [2]

28. (i) Write any two postulates of Dalton’s Atomic Theory. [2] (ii) Write the notation of the element E having 7 electrons in its shells and 8 neutrons in its nucleus. [1] (iii) Write two conclusions drawn by Rutherford from his α-rays scattering experiment. [2]


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OR (i) Write the main points of Thomson’s model of atom. [2] (ii) Write the main postulates of Bohr’s model of atom. [2] (iii) Give the schematic atomic structure of sulphur. [1] 29. (i) Name the cells which get destroyed in infantile paralysis. [1] (ii) Give any two preventive measures of AIDS. [2] (iii) Name the different stages of malaria and mention their symptoms. [2] 30. (i) Draw the oxygen cycle. [3] (ii) Name any two greenhouse gases. [1] (iii) Enumerate any two harmful effects of UV radiations. [1]

OR

(i) Give any six functions of atmosphere or air. [3] (ii) What is biological magnification? Give one example of it. [2]

Edition: 2020-21

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i-Tutor Term Test-6