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CBSE Class 9 Science Sample Paper
SUBJECT: SCIENCE
CLASS : IX
MAX. MARKS : 90
DURATION : 3 HRS
General Instructions:
- The question paper comprises of two sections – A, B. You are to attempt all the sections.
- All questions are compulsory.
- There is no overall choice. However Internal Choice has been provided in all the five questions of 5 marks category. Only one option in such questions is to be attempted.
- Question numbers 1 to 3 in Section-A are one mark questions. They are to be answered in one word or in one sentence.
- Question numbers 4 to 7 in Section- A are two marks questions. These are to be answered in about 30 words each.
- Question numbers 8 to 19 in Section-A are three marks questions. These are to be answered in about 50 words each.
- Question numbers 20 to 24 in Section-A are 5 marks questions. These are to be answered in about 70 words each.
- Question numbers 25 to 42 in Section- B are multiple choice questions based on practical skills. Each question is of one mark. You are to choose one most appropriate response out of the four provided to you.
SECTION – A
- Which form of energy will a body possess placed at the top of hill?
- In which layer of the atmosphere ozone layer is located?
- If Z=3,What would be the valency of element? Write the name of element.
- Calculate the mass of 1 molecule of Nitrogen gas.
- Complete the following chart-
- State two causes and two effects of depletion of ozone layer.
- Relative density of silver is 10.8 ,The density of water is 10³ kg/m³. What is density of silver in S.I. unit?
- Give reasons- a. Which divison among plants have the simplest organisms? b. How do Gymnosperms and Angiosperms differ from each other?
- A) Why a person suffering once from small pox cannot suffer from it again? B) Name one disease associated with the attack of microbe on the lungs.
- A child hears an echo from a cliff in 10 sec after the sound from an animal is produced. Calculate the distance between the cliff and the child. ( take velocity of sound as 340 m/s)
- A) Draw a diagram showing graphical representation of low pitch and high pitch sound. B) Write any 2 applications of SONAR.
- People often bemoan that quality of air has gone down since their childhood. a) How is quality of air affectd? b) How does this quality affect us and other life forms?
- A) Write 2 differences between acute and chronic diseases. B) Give one example of each.
- Identify the phylum of the following 2 organisms and write 2 characteristic feature of each- (a) (b)
A) Give difference between thrust and pressure. B) Why does an object float or sink when placed on the surface of water? C) What do you mean by Buoyancy.
- A) Derive an expression for kinetic energy of a moving body. B) Name the type of energy possessed by i. Flowing water ii. Stretched rubber band D) A car weighing 2000 Kg is accelerated from rest and covers a distance of 40 m in 6 sec. calculate the work done by the car. OR A) Drive an expression for Potential energy of a body. B) When do you say that work is done? C) A porter lifts a luggage of 15kg from the ground and puts on his head 1.5m above the ground.Calculate the work done by him on the luggage.
- From the given table answer the following-
ELEMENT MASS NUMBER ATOMIC NUMBER A (^11 ) B 19 9 C 3 2 D 23 11 E 9 4
a) How many electrons are present in E? b) Which is an inert gas? Why? c) Which atom will form a negatively charged ion? d) Which element has 12 neutrons? Why? e) Which atom will form a cation with one positive charge.
OR
A) Which postulate of dalton’s atomic theory is the result of Law of conservation of mass? B) Why is it not possible to see an atom with naked eyes? C) Write the symbols for following elements: Sodium,Zinc,Lead,Chlorine.
SECTION- B
Multiple choice questions ( 1 MARK EACH)
- Jointed appandages are characteristic feature of : a. Cockroach
b. Earthworm c. Bonyfish d. Pigeon
- The level of water in measuring cylinder before and after immersing a solid of mass 1.5 g has risen from point A to B as shown below. The density of the solid object would be:
B
A
a. 1g/ cc b. 1.5 g/cc c. 2g/cc d. 0.75g/cc
- If the reflected and incident sound are at an angle of 90 degrees with each other, the incident angle should be: a. 60 degrees b. 30 degrees c. 45 degrees d. 180 degrees
- 2 specimens A and B were observed by a child for spotting as shown below. After identifying the given specimens, in which of the following groups should he place them:
FIGURE - A FIGURE - B
s.no A B a Bryophyta Pteridophyta b Pteridophyta Gymnosperms c Algae Gymnosperms
d. Sporangium
- The speed of sound in air is about a. 3 x 10^8 m/s b. 340 m/s c. 340 cm/s d. 340 km/s
- Ribbon shaped and spiral chloroplast is present in which of the following organism: a. Ulothrix b. Agaricus c. Spirogyra d. Chlamydomonas
- Seeds are naked in: a. Angiosperms b.Gymnosperms c. Both of these d none of these
- While determining the density of a metal block using a spring balance and a measuring cylinder, a student followed the following steps in his experiment. I. Noted the water level in the measuring cylinder without the metal block. II. Immersed the metal block centrally in water without touching the sides and centre of the bottom. III. Noted the water level in the measuring cylinder with the metal block inside it. IV. Removed the metal block from the water and immediately weighed it using a spring balance.
The incorrect step in the procedure is a. I b. II c. III d. IV
- When sound gets reflected from a surface: a. The angle of reflection is always greater than the angle of incidence. b. The angle of reflection is always less than the angle of incidence. c. The angle of reflection is always equal to the angle of incidence. d. The angle of reflection is always equal to 90 degrees.
- Upthurst is a force which acts in a. Upward direction b. Downward direction c. Any direction d. None of the above\
- Weight of an object in air is 100 N. Its weight in water will be: a. Less than 100 N b. More than 100 N c. Equal to 100 N d. Zero
- Pulse is a a. Short duration disturbance b. Does not repeat
c. Can travel d. All of the above
- A pulse travels through a slinky 10 m long from one end to the other end and then back to the point of origin in 3 sec. the velocity of pulse in the slinky is a. 3.33 m/s b. 4.5 m/s c. 6 m/s d. 6.66 m/s
d = v x t/2 = 340 x 10/2 1 = 1700 m 1
- Refer to NCERT book pg 165 and 171. ( 2 for diagram + ½ each for application)
- A) any one reason 1 B) Any two points 2
13 A)
ACUTE DISEASES CHRONIC DISEASES These diseases are short term These diseases have long duration The patient recovers completely The patient never recovers completely B) ACUTE- common cold, tuberculosis CHRONIC- diabetes, elephantiasis ( any one ) ½ each C) A) porifera- any two characteristic ( ½ + 1 ) B) Platyhelminthes- any two characteristic ( ½ + 1 ) D) A) Because each shell has its own fixed energy. ( 1 marks ) B) K,L,M,N ( 1 ) C) 18 Electrons (1)
E) A) Molar mass of CH 3 COOH = 12u + 3u x1 + 12u + 16u + 16u + 1u 1 = 60 u 1 B) AlCl3 , NH 4 NO 3 ½ each F) A) refer to NCERT book 1 B) Height of each step = 25 cm No. of steps = 20 Total height = 25 x 20 = 500 cm = 5 m ½ Work done = mgh = 45 x 10 x 5 = 2250 J ½ Power = workdone/time = 2250/20 = 112.5 watt 1 G) Hydroelectric power- water to electricity, explosion of cracker- chemical to heat, light and sound energy, oscillating pendulum- kinetic energy to potential energy 1+1+ H) Mass of sodium sulphate = x g Mass of sodium sulphate + Mass of barium chloride = Mass of sodium chloride + Mass of barium sulphate X g + 5.22 g = 6.10 g + 2.80 g 1 X g = 8.90 – 5.22 = 3.68 g. law of conservation of mass is used. 1+ I) Refer to ncert ( 2 marks for diagram + 1 for labeling+ 2 for Explanation) Or Refer to ncert book pg. 172 ( 2 marks for diagram + 1 for labeling+ 2 for working) J) A) Cyclic flow of nutrients between living and non living components are called biogeochemical cycles. 1 B) Refer to NCERT book pg 198. ( 2 for diagram + 2 for labeling) Or A) Refer to ncert 1 B) Refer to ncert book pg 199 ( 2 for diagram + 2 for labeling)
K) A) Archimedes principle 1 B) In water the apparent weight of the bucket is less. 1 C) a= weight of the object, b= upthrust ( 1+1 ) Object will sink. ( 1 mark) Or A) Any two points 2 B) Refer to ncert 2 C) buoyancy is the upward force on an object produced by the surrounding liquid or gas in which it is fully or partially immersed 1 L) A) refer to NCERT book. 2 B) Kinetic energy and elastic potential energy. ½ + ½ C) S = ut + ½ at^2 ½ 40= 0 + ½ a x 36 a = 40/18 = 2.22 m/s^2 1/ Work done = F x S = m x a x s = 2000 x 2.22 x 40 = 177600 J 1 Or A)Refer to ncert text book pg no. 153 2 B) Work is said to be done if force is applied on an object and it shows some displacement 1 C) mass of object, m - 15 kg Displacement- 1.5 m Work done-F X S = mg X s 1.5 X 10 X 1.5 = 225J 2 M) a. 4 electrons. b. C because it has completely filled shell. c. B because it has 7 valence electrons. d. D e. D OR A)The law of conservation of mass is based on following postulate of Dalton’s atomic theory. “ Atom can neither be created and nor be destroyed during a physical change or chemical reaction”. 1 B) Because they are far too small to be seen even with a microscope. They have a diameter of between 32-225 pm (pm = 1x10-12^ metres). 2 C) Na, Zn,Pb,Cl ( ½ marks for each)
MCQ
Q.NO ANSWER Q.NO ANSWER
25 a 33 b 26 a 34 b 27 c 35 c 28 d 36 b 29 c 37 d
