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Science Sample Paper Class 9
Instructions:
- The question paper comprises four sections A, B, C and D. There are 36 questions in the question paper. All
questions are compulsory. - Section A- question no. 1 to 20 – all questions and parts there of are of one mark each. These questions
contain multiple choice questions (MCQs), very short answer questions and assertion – reason type questions.
Answer to these should be given in one word or one sentence. - Section B- question no. 21 to 26 are short answer type questions, carrying 2 marks each. Answer to these
questions should be in the range of 30 to 50 words. - Section C- question no. 27 to 33 are short answer type questions, carrying 3 marks each. Answer to these
questions should be in range of 50 to 80 words. - Section D- question no. 34 to 36 are long answer type questions, carrying 5 marks each. Answer to these
questions should be in range of 80 to 120 words. - There is no overall choice. However, internal choices have been provided in some questions. A student has to
attempt only one of the alternatives in such questions. - Wherever necessary, neat and properly labeled diagram should be drawn.
SECTION – A
Q.1. An element A has valency 2. Write the formulae of its hydroxide and nitride.
or
An element X has valency 1. Write the chemical formulae of its chloride & oxide.
Q.2. J. Chadwick discovered a subatomic particle which has no charge and has mass nearly equal that of a
proton. Name the particle and give its location in the atom.
Q.3. Which of the following statements are correct for pure substances?
(i) Pure substances contain only one kind of particles.
(ii) Pure substances have the same composition throughout.
(iii) Pure substances can be exemplified by all elements other than copper.
(a) i & ii (b) i & iii (c) iii & iv (d) ii & iii
Q.4. Can a constant velocity be maintained in a body moving on a rough surface without doing any work
on it? Justify your answer.
Q.5. When a branch of a tree is shaken, some of the fruits may fall down. Why?
Q.6. The two ends of a spring-balance are pulled each by a force of 10 kg-wt. What will be the reading of
the balance?
Q.7. Name the physical quantity which remains conserved during collision between two or more isolated
bodies.
Q.8. A truck and a car moving with the same kinetic energy are brought to rest by the application of brakes which provide equal retarding forces. Which body will move more distance before coming to rest.
or
Do action-reaction forces produce the same magnitude of acceleration?
Q.9. State and define the SI unit of power.
Q.10. What type of plastid is more common in
a) flowers and fruits
b) roots of plants
Q.11. Name the type of cell division in which chromosome number is reduced to half. What is the significance of this step?
Q.12. Which tissue is present in tip of your nose? Give its chemical composition.
Q.13. Name the element of xylem which
a) helps in transport of water and minerals
b) provides mechanical support
Q.14. Assertion (A) – According to latest IUPAC recommendations, ions the atomic mass unit is to be represented by ‘U’
Reason (R) Atoms of most elements are not able to exist independently.
Q.15. A person met with an accident in which two bones of hand were dislocated. What could be the reason?
Q.16. Assertion – Reason type
- Both Assertion – Reason are correct and reason is correct explanation of assertion.
- Both Assertion – Reason are correct but reason is not correct explanation of assertion.
- If A is true, R is false
- If A is false, R is true
Assertion: Diseases where microbes are immediate causes are called infectious diseases.
Reason: Some cancers are caused by genetic abnormalities.
Case Studies
Q.17. There are two ways of preventing diseases. These are general and specific ways. The general ways generally relate to preventing exposure to microbes and availability of proper food for everyone. The specific ways relate to the property of immune system to fight off microbial infections.
Answer these questions based on the case study.
a) What is a vaccine?
b) Name a vaccine which saves lives of children from three diseases?
c) ‘We can fool the immune system into developing a memory’. Explain this statement.
d) Children in India get immune to one disease before they are vaccinated, before the age of 5 years. Name the disease and write the reason why this happens.
Q.18. Answer any four questions out of five on the basis of your understanding of the following paragraph & related concepts. The most remarkable concept that Dalton’s atomic theory proposed was that of atomic mass. According to him, each element had a characteristic atomic mass. The theory could not explain the law of constant proportion so well that scientists were prompted to measure the atomic mass of an atom. Since determining the mass of an individual atom was a relatively difficult task, relative atomic masses were determined using the law of chemical combination and the compounds formed. Let us take the example of a compound carbon monoxide (CO) formed by carbon & oxygen. It was observed experimentally that 3 g of carbon combines with 4g of oxygen to form CO. In other words, carbon combines with 4/3 times its mass of oxygen. Suppose we define the atomic mass unit (earlier abbreviated as amu but according to latest recommendations as u) as equal to mass of one carbon atom, then we would assign carbon an atomic mass of 1.0 u & oxygen an atomic mass of 1:33 u. However it is more convenient to have these numbers as whole numbers or as near to a whole number as possible. While searching for various atomic mass scientists initially took 1/16 of the mass of an atom & naturally occurring oxygen as the unit.
(a) What is the most remarkable concept of Dalton’s atomic theory?
(b) Why was the concept of relative atomic mass introduced?
(c) Why was initially 1/16 of the mass of oxygen taken as the unit?
(d) What is now the standard reference for measuring atomic mass?
(e) What is 1 atomic mass unit?
Q.19. Whenever an object moves near the surface of earth with no other object pushing or pulling it, it is accelerated. This acceleration is caused due to force of gravity and is called acceleration due to gravity. For an object of mass ‘m’ moving freely near the earth’s surface,
(I) The value of acceleration due to gravity of a body due to earth during free fall is
(A) 9.8 cm/s2
(B) 98 cm/s2
(C) 980 cm/s2
(D) 980 m/s2
(II) Acceleration due to gravity ‘g’ on the surface of earth and universal gravitational constant ‘G’ are correlated as:
(III) If two stones, one of mass 100g and another of mass 2 kg are allowed to fall from the top of a high tower simultaneously. Then
(a) stone of mass 2 kg will reach the ground first.
(b) stone of mass 100 g will reach the ground first.
(c) both the stones will reach the ground simultaneously.
(d) information given is incomplete.
(IV)Two objects of different masses falling freely near the surface of moon would
(a) have different velocities at any instant
(b) experience forces of same magnitude.
(c) have same accelerations >g
(d) have same acceleration <g
Q.20. It is our common experience that different persons complete a given work in different times. A person doing a given work in less time is said to be stronger but another person doing the same work in longer time is said to be weaker. Again different machines transfer energy at different rates. A more powerful vehicle would complete a journey in a shorter time than a less powerful vehicle. Thus, we define a term ‘power’ which is a measure of the rate of doing work.
(I) Power (P) and work (W) are correlated as
(II) A man is holding a weight of 1 kg at a height of 1m for 30 sec. How much power is delivery by him?
(A) 9.8/30 W (B) 9.8×30 W (C) 9.8 W (D) zero
(III) A person A does 500 J of work in 10 minutes and another person B does 600 J of work in 20 minutes. Let the power delivered by A and B be p1 and p2 respectively. Then,
(A) p1 = p2
(B) p1 > p2
(C) p1 < p2
(D) p1 and p2 are undefined.
(IV) 1 Horse power is
(A) 1000W (B) 1000 kW (C) 3.6 x106 W (D) 746 W
SECTION – B
Q.21. Kidney beans are soaked in water overnight before cooking them the next day. What is the reason behind this? What biochemical process occurs during the phenomenon?
OR
Give reasons:
a) Liver cells of vertebrates are rich in ER.
b) Specialised vacuoles are present in some unicellular organisms.
Q.22. What are the changes that lead to formation of Cork. Mention two characteristics of Cork that help it to act as protective tissue.
Q.23. What will you observe if –
a) Carbon disulphide is added to a mixture of Iron and Sulphur.
b) Dilute hydrochloric acid is added to a compound formed by Iron and Sulphur.
or
Fractional distillation is suitable for separation of miscible liquids with a boiling point difference of about 25k or less. Which part of fractional distillation apparatus makes it efficient and possess an advantage over simple distillation. Explain.
Q.24. Calculate the concentration of the solution in terms of mass by mass percentage if a solution contains 50gm sugar in 450 gm of water.
Q.25. (i) Distinguish between distance and displacement.
(ii) What can be the shape of path covered by a moving body to have
(a) uniform speed (b) uniform velocity
Q.26. (a) What do you mean by the weight of a body? What is its unit?
(b) How does the weight of an object change on moving from equator to poles? Can weight of an object be zero?
SECTION – C
Q.27. Draw a diagram of a neuron and label the following parts
a) Process through which neuron receives messages.
b) The single long process of neuron
c) The part of cell known as its controlling centre.
or
Name the organs/parts (2 each) of our body where we find the following epithelium-
a) Cuboidal epithelium
b) Columnar epithelium
c) Simple Squamous epithelium
Q.28. Draw a well labeled diagram of a Prokaryotic cell?
Q.29. a) Differentiate between Chromatin and Chromosomes.
b) What is meant by membrane biogenesis?
Q.30. Differentiate between true solution, colloids and suspension on the basis of size, stability & filtration.
Q.31. a) Calculate the number of particles in 31g of phosphorous molecule (at mass = 31u)
b) Calculate the number of moles in 22g of carbon dioxide.
Q.32. a) Sulphur dioxide is a colourless pungent smelling gas and is the major air pollutant. Write the electronic configuration of its constituents.
b) An ion M3- contains 10 electrons & 7 neutrons. What is the atomic number and mass number of element M.
c) Give reason-nucleus is heavy and positively charged.
Q.33. (a) Give two applications of universal Law of Gravitation.
(b) A stone is thrown vertically upward with an initial velocity of 40 m/s, taking g=10m/s2. Find the maximum height reached by the stone. What is the net displacement and the total distance covered by the stone when it reaches the initial position?
SECTION – D
Q.35. a) Differentiate between sign and symptoms of a disease.
b) How do diseases spread through air. Explain and give two examples of such disease?
c) The signs and symptoms of a disease depend upon the tissue or organ the microbe targets. Explain this statement by giving two examples.
or
a) What do you mean by acute and chronic diseases?
b) Name two diseases spread by sexual contact?
c) Explain the role of vectors in spreading infectious diseases.
d) The point of entry of a microbe does not necessarily decide the organ it will infect. Justify by giving two examples.
Q.36. (a) State ‘Law of Conservation’ of Momentum. Give illustration in its support.
(b) A boy of mass 50 kg running at 5ms-1 jumps on to a 20 kg trolley travelling in the same direction at 1.5 ms-1 . Find their common velocity and change in momentum of boy and trolley.
or
(a) Define SI unit of work. Write expression for positive work.
(b) What will be the work done if displacement of object is perpendicular to the direction of force.
(c) A bullet of mass 10 gm is fired from a rifle with a speed of 800 ms-1 . After passing through a mud wall 1m thick, the speed of bullet drops to 200 ms-1 . Calculate the work done by the mud wall on the bullet.
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