CLASS 7

SAMPLE PAPER 1 FOR CLASS 7 https://drive.google.com/file/d/1ZEUXux8QSiWU5_HDuhvUEXwpQu1znaBh/view?usp=drive_link 

CLASS 9 SAMPLE QUESTION PAPER 2 FOR PRACTICE

 

     

SUBJECT : SCIENCE (SET –6)

 MAX. MARKS- 80                                       CLASS –IX                                         TIME -3 HRS

 

 

General Instructions:

1. This question paper consists of 39 questions in 5 sections.

2. All questions are compulsory. However, an internal choice is provided in some questions. A student is expected to attempt only one of these questions.

3. Section A consists of 20 Objective Type questions carrying 1 mark each.

4. Section B consists of 6 Very Short questions carrying 02 marks each. Answers to these questions should in the range of 30 to 50 words.

5. Section C consists of 7 Short Answer type questions carrying 03 marks each. Answers to these questions should in the range of 50 to 80 words.

6. Section D consists of 3 Long Answer type questions carrying 05 marks each. Answer to these questions should be in the range of 80 to 120 words.

7. Section E consists of 3 source-based/case-based units of assessment of 04 marks each with sub-parts.

 

 

SECTION-A Select and write one most appropriate option out of the four options given for each of the questions 1 – 20
1.	During summer days water is kept in earthen pot becomes cool because of the phenomenon of a. diffusion b. transpiration c. Osmosis d. evaporation			1
2.	Which of the following statements is true for pure substances? (i) Pure substances contain only one kind of particles (ii) Pure substances may be compounds or mixtures (iii) Pure substances have the same composition throughout (iv) Pure substances can be exemplified by all elements other than nickel  (a) (i) and (ii)                                        (b) (i) and (iii)  (c) (iii) and (iv)                                     (d) (ii) and (iii)			1
3.	Which of the following is not a mixture a. kerosene b. air c. alcohol d. petrol.			1
4.	The atomic theory of matter was proposed by a. John Kennedy b.  Lavoisier c. Proust d. John Dalton			1
5.	The subatomic particle called electron was discovered by a.  JJ Thomson b.  Neil  Bohr c.  James chadwick d. E.Goldstein
6.	Which of the following statement is always correct a.  an atom has equal number of electrons and protons b. an atom has equal number of electron and neutrons. c. an atom has equal number of protons and neutrons d.an atom has equal number of electron, proton and neutron .			1
7.	For an element Z = 9. The valency of this element will be a.4 b.2 c.1 d.3			1
8.	Cell arises from pre existing cell was stated by a. Haeckel b. Virchow c. Hooke d. Schleiden			1
9.	Which of the following are covered by a single membrane? a. mitochondria b.vacuole c. nucleus d. plastid			1
10.	Which one is made up of dead cells a.sclerenchyma b.tracheids c.vessel d.all the above			1
11.	Ligament connects are bone with a. skin b. muscle c. bone d. both b and c.
12.	When a car runs on a circular track with a uniform speed, its velocity is said to be changing. This is because   a. the car has a uniform acceleration b. the direction of car varies is continuously c. the car travels unequal distances in equal time interval d.the car travels equal distances  in unequal time intervals.
13.	The inertia of a moving object depends on a.  momentum of the object b.  speed of the object c. mass of the object d. shape of the object.			1
14.	The value of g on the surface of the Moon a. is the same as on the earth b.is less than that on the earth c. is more than that on the earth d.keeps changing day  by day.			1
15.	Four balls A ,B,C and D displaces 10 ml ,24 ml ,15 ml and 12 ml of a liquid respectively ,when immersed completely .The ball which will undergo the maximum Apparent loss in weight will be a. A b. B c. C d. D.
16.	The work done on an object does not depend on the : a. displacement b.  angle between force and displacement c.force applied d. initial velocity of the object.			1
	Q. no 17 to 20 are Assertion - Reasoning based questions. These consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below: (a)    Both A and R are true and R is the correct explanation of A (b)   Both A and R are true and R is not the correct explanation of A (c)    A is true but R is false     (d)  A is False but R is true
17.	Assertion : Valency of Oxygen atom is 2.  Reason: Valency of atom of an element having Valence Electrons 5,6,7 or 8 can be calculated as= 8 - number of valence electrons.			1
18.	Assertion :A simple tissue is made up of only one type of cell.  Reason :Various simple tissue in plants are parenchyma, collenchyma and sclerenchyma.			1
19	Assertion :The work done by a force on the body is always positive.  Reason : The direction of displacement of the body decides whether the work done would be positive or negative.			1
20.	Assertion :Lysosomes are also called as suicidal bags of a cell.  Reason :When the cell gets damaged ,lysosome me burst and the enzyme digest their own cell.			1
Section - B
21.	Convert the following temperature to Celsius scale: (a) 300 K (b) 573 K	2
22.	Calculate the formula unit masses of ZnO, Na2O, K2C03, given atomic masses of Zn = 65 u, Na = 23 u, K = 39 u, C = 12 u, and O = 16 u.	2
23.	Give the names of the elements present in the following compounds: (a) Quick lime (b) Hydrogen bromide (c) Baking powder (d) Potassium sulphate.	0.5 X 4
24.	Why are lysosomes known as suicide bags?	2
25.	Explain why some of the leaves may get detached from a tree if we vigorously shake its branch.	2
26.	Differentiate between speed and velocity.	2
Section – C
27.	Give reason for the following observations. (a) Naphthalene balls disappear with time without leaving any solid. (b) We can get the smell of perfume sitting several meters away.	1.5+1.5
28.	What would happen to the life of a cell if there was no Golgi apparatus?	3
29.	What are the functions of areolar tissue?	3
30.	A train is travelling at a speed of 90 km/hr. Brakes are applied so as to produce a uniform acceleration of –0.5 m/sec2. Find how far the train will go before it is brought to rest.	3
31.	.Why is it difficult to hold a school bag having a strap made of a thin and strong string?	3
32.	What is the work done by the force of gravity on a satellite moving round the earth? Justify your answer.	3
33.	Flash and thunder are produced simultaneously. But thunder is heard a few seconds after the flash is seen, why ?	3
Section – D
34.	a)    What are the differences between true solution, colloidal and suspension. b)    A solution contains 50g of common salt in 400g of water. Calculate the concentration in terms of mass-by-mass percentage of the solution.   OR      (a)Distinguish between compounds and mixtures ( three point of differences) . (b)Calculate the mass of sodium sulphate required to prepare its 20% (mass per cent) solution in 100 g of water.	2.5x2
35.	Name the following: (1) Tissue that forms the inner lining of our mouth. (2) Tissue that connect muscle to bone in humans. (3) Tissue that transports food in plants. (4) Tissue that stores in our body. (5) Connective tissue with a fluid matrix.	1x5
36.	What are the advantages of composite fish culture?                                                OR What are weeds? How can we control them? Give different methods of weed control.	5
Section – E
37.	Rutherford (1871-1937) was known as the ‘Father’ of nuclear physics. He is famous for his work on radioactivity and the discovery of the nucleus of an atom with the gold foil experiment. Ernest Rutherford was interested in knowing how the electrons are arranged within an atom. Rutherford designed an experiment for this. In this experiment, fast moving alpha (α)-particles were made to fall on a thin gold foil. On the basis of his experiment, Rutherford put forward the nuclear model of an atom, which had the following features: ·        There is a positively charged centre in an atom called the nucleus. Nearly all the mass of an atom resides in the nucleus. ·        The electrons revolve around the nucleus in circular paths. ·        The size of the nucleus is very small as compared to the size of the atom. Drawbacks of Rutherford’s model of the atom: The revolution of the electron in a circular orbit is not expected to be stable. Any particle in a circular orbit would undergo acceleration. During acceleration, charged particles would radiate energy. Thus, the revolving electron would lose energy and finally fall into the nucleus. If this were so, the atom should be highly unstable and hence matter would not exist in the form that we know. We know that atoms are quite stable. (1) Which of the following scientist was known as the ‘Father of nuclear physics? (a) J.J. Thomson (b) John Dalton (c) E. Rutherford (d) Niels bohr  (2) Identify the correct statement Statement 1 – Positively charged centre in an atom called the nucleus. Statement 2 – The electrons revolve around the nucleus in circular paths. Statement 3 – Nearly all the mass of an atom resides in the nucleus. Statement 4 – The size of the nucleus is very small as compared to the size of the atom. (a) Only 2 (b) Both 3 & 4 (c) Both 1 & 2 (d) All of the above (3) Write the features of Rutherford’s nuclear model of an atom?		1+1+2
38	All living Organisms are made up of cells and these cells perform all the functions essential for the survival of the Organism eg. Respiration, digestion, excretion etc. In Unicellular organisms, a single cell carries out all these functions and in multicellular organisms different group of cells carry out different functions. Cells were first discovered by Robert Hooke in 1665. He observed the cells in a cork slice with the help of a primitive microscope. Leeuwenhoek (1674), with the improved microscope, discovered the free living cells in pond water for the first time. It was Robert Brown in 1831 who discovered the nucleus in the cell. Purkinje in 1839 coined the term ‘protoplasm’ for the fluid substance of the cell. (1) Who discovered the cell? (a) Robert Hooke (b) Leeuwenhoek (c) Robert Brown (d) T. Schwann (2) Who discovered the nucleus in the cell? (a) Robert Hooke (b) Leeuwenhoek (c) Robert Brown (d) T. Schwann (3) Who coined the term ‘Protoplasm’? (a) Robert Hooke (b) Leeuwenhoek (c) Robert Brown (d) Purkinje (4) What is protoplasm? (a) Unit of life (b) Cell organelle (c) Fluid substance of the cell. (d) Cytoplasm                         OR (5) Which of these statement is true about the cell? (a) All organism are made up of cell (b) Cell is the basic unit of life (c) Cell is responsible for different metabolic functions (d) All above		1+1+1+1
39.	Every object in the universe attracts every other object with a force which is proportional to the product of their masses (m1 x m2) and inversely proportional to the square of the distance (d2) between them. The force is along the line joining the centers of two objects.   (i)Gravitational force does not depend on (a) Masses of objects (b) Separation between objects (c) Charges on objects (d) None of these   (ii) Force of gravitation varies with masses of object as (a) Product of masses (b) Sum of masses (c) Difference of masses (d) None of these (iii) When mass of one body is doubled then force of gravitation will become (a) Force will remain same (b) Force will become double (c) Force will become halved (d) None of these   (iv) The value of quantity G in the law of gravitation (a) depends on mass of earth only (b) depends on radius of earth only (c) depends on both mass and radius of earth (d) is independent of mass and radius of the earth                                       OR (v)Law of gravitation gives the gravitational force between (a) the earth and a point mass only (b) the earth and Sun only (c) any two bodies having some mass (d) two charged bodies only		1+1+1+1