CBSE 2015 – 2016 Class 09 SA2 Question Papers

Class 9 Original Question Paper March 2016 for 2015-16

9th Maths Question paper(visitor) 2015-16-1 

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9th Maths Question paper(visitor) 2015-16-2

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9th Maths Question paper(visitor) 2015-16-3       

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9th Maths Question paper(visitor) 2015-16-4     

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IX Original English Question paper SA2 March 2016 

9th English_2016_SA2 Question papers - 1
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IX Original Paper with OTBA March 2016 session 2015-16

9th Science question paper by visitor 2015-16-1
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9th Science question paper by visitor 2015-16-2
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Guess Questions 2nd Summative Assessment 2012-13

Guess Questions Summative Assessment -II(2012-13) SET-01[FM=30]

1. Define 1 kWh.[1]

2. In an oscillating pendulum, at what positions the potential and kinetic energy are maximum ?[1]

3. A piece of stone is tied at one end of a rubber string and holding from other end, it is allowed to immerse partially then fully into water. What difference if any, you will observe, and why ?[2]

4. Differentiate between low and high pitch sound using neat and labeled diagram.[2]

5.An object of 40N weight when immersed in water losses 10N weight. Will the object float or sink why? [2]

6. What does acronym SONAR stand for ? What type of wave does it use?Write any two uses of SONAR. [3]

7. An object is made to fall from different heights 20cm, 40cm and 60cm on a wet sand.(a) What do you observe on the sand ? (b)Explain the reasons of the observations. [3]

8.A sound wave has a frequency of 5000Hz. and wavelength of 20cm. How long will it take to travel 1 km ? [3]

9. What do you mean by work ? Give an example of negative work done. What is the work to be done to increase the velocity of a car from 18km/hr to 90 km/hr if the mass of the car is 2000 kg ?[5]

10. State law of conservation of energy. An object of mass 10kg is dropped from a height 5m above the ground. Show that total energy of the object at the height 5m and 2m is same. (Take g=10m/s2). What happens to the energy when the object touches the ground ? [5]

Or,

(a) How do we define Power of a body. Also define 1 Joule. (b) State the transformation of energy taking place when (i) Green plants prepare their food. (ii) Head of a nail is hammered hard and it becomes warm. (c) With what velocity should a body of mass 4 kg be thrown so that it acquires 1.25 kJ  of kinetic energy

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Guess Questions Summative Assessment -II(2012-13) SET-02[FM=30]

ASSIGNMENT FOR THE SESSION 2011-2012 Class: IX Subject : Science & Technology

JSUNIL TUTORIAL: Section A : Physics 
Q.1. Define work energy and power. Give the proper SI units. Hence derive the expression for kinetic
and potential energy.
Q.2. State and prove the principle of conservation of energy. Also prove work energy theorem.
Q.3. A boy is moving on a road against a frictional force of 5N. After travelling a distance of 1.5km,he forgot the correct path at a roundabout (figure) of radius 100m. However he moves on a circular path for one and half cycle and then he moves forward upto 2 km. Calculate the workdone by him.
Q.4. Weight of a wooden piece is 6 kg.While floating in water its 1/3 rd volume remains submerged in
water. Calculate the maximum weight that may be placed on it so that it may float completely submerged.
Q.5. When a boat floats in water its one fourth volume remains submerged. The maximum weight that can be placed on boat is 1200 kgf. Calculate the weight of empty boat.
Q.6. Explain the working and application of a SONAR. How defects in ametal block can be dected using ultrasound.
Q.7. A stone is dropped from the top of a tower 500m high into a pond of water at the base of the tower. When is the splash heard at the top? Given, g=10m/s2 and speed of sound =340m/s.
Section B : Chemistry
1. Calculate the mass of : a) 0.5 mole of silver  b)  0.5 mole of sugar (C12H22O11). (Given atomic
masses are Ag = 108, C = 12, O = 16, H = 1)
2. Calculate the a) the number of atoms in one gram of gold    b) the number of molecules in a drop of water weighing 0.05g.(atomic mass of gold = 197u) 1 x 10²² atoms of an element X are found to have a mass of 930mg. Calculate the molar mass of the element X.
3. What is the difference between the atomic mass and gram atomic mass of an element?
4. What are the limitations of Dalton’s atomic model?
5. What are the draw backs of Rutherford’s atomic model?
6. What are the salient features of Bohr’s atomic model?
7. What are the postulates of Dalton’s modified atomic theory?
8. Write the electronic configuration of the isotopes of chlorine and isobars of Ar, Ca.
9. The average atomic mass of a sample of an element X is 16.2 u. What are the percentages of  isotopes of oxygen 16 and 18 in the sample?
10. A Bromine atom is available in the form of two  isotopes. 79Br (49.7%) and 81Br (50.3%). Calculate the average atomic mass of Bromine atom. The atomic no. of Bromine is 35.
11. No. of protons, neutrons and electrons in four spaces A, B, X and Y are respectively 6, 6, 6; 7, 7,7; 6, 8, 6; and 9, 10, 10. Give symbolic representation of each species and tell which of them are isotopes and which are isobars.
12. What do you mean by radio isotopes? Give two applications of isotopes. 13. Differentiate between isotopes and isobars. Write the application of the following isotopes:
a)  U-235, Co-60, P-32 and I-131.
14. Atomic no. of Na is 11 and mass no. is 23. What type of ion will be formed by it and how will you represent it? Calculate the no. of electrons, neutrons and protons in the ion formed.
15. An ion X-2  contains ten electrons and 8 neutrons. What are the atomic no. and mass no. of element X? Name the element.
Section C : Biology 
CHAPTERS - BIOLOGICAL DIVERSITY, HEALTH & DISEASES, OUR ENVIRONMENT 
(BIOGEOCHEMICAL CYCLES, GREENHOUSE EFFECT) 
1. What is evolution? How is algae different from fungi? Draw diagram of any one member of Protista.
2. How are pteridophytes different from bryophytes? Write any four differences between angiosperms and gymnosperms.
3. Write the differences (any four) between the following groups
 a) poriferans and coelenterates   b) molluscs and arthropods  c) flatworms and roundworms   d) aves and mammals
4. Explain the different means by which infectious  diseases spread in the environment? List the preventive measures of such diseases.
5. Justify, why it is difficult to make antiviral medicines than antibacterial medicines.
6. Explain the different processes involved in oxygen and water cycle operating in nature.
7. Represent schematically the carbon and nitrogen  cycle operating in the biosphere. How is carbondioxidefixed in environment?

CBSE Sample paper science class 9th SA2 solved

CBSE ADDA: sample paper science class 9th sa2 solved:

1. Relative density of silver is 10.8. The density of water is 10³ Kgm^-3. What is the density of silver in SI unit?

Ans: Relative density of silver = 10.8 Relative density of water = 10³ Kgm^-3

Density of silver = Relative density of silver x Relative density of water = 10.8 x 10³ Kgm^-3

2. Is potential energy a vector or a scalar quantity?

Ans: Potential energy is a scalar quantity.

3. (i) Give any two examples of longitudinal waves.(ii) What is the most essential property of a wave motion and why?

Ans: (a) i. Waves produced in air. ii. When a freely suspended spring is pulled downwards and released, longitudinal waves are produced.

(b) The most essential property of a wave motion is its frequency. Frequency of a wave is its inherent characteristic and does not change by the change in temperature, pressure or change in medium.

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CBSE Physics IX Physics Summative II Worksheet – 2011-12

CBSE Physics IX Physics Summative II Worksheet – 2011-12 JSUNIL TUTORIAL,SAMASTIPUR

1 MARK QUESTIONS

1. Nails and pins have pointed tips. Give reasons?

2. State Archimedes’ principle.

3. What will happen to the amount of work done if (a) the magnitude of force applied is increased. (b) the displacement of the body is reduced?

4. What is the work done on a body moving in a circular path?

5. Convert kwh into joules.

6. Why are sound waves called mechanical waves?

7. We cannot hear sound from the space. Why?

8. Why can we recognize our family members from their voice without seeing them?

9. What is meant by echocardiography?

10. What is the audible range of human ear?


2 MARK QUESTIONS

1. What is meant by reverberation? That are the measures taken to reduce reverberation?

2. Distinguish between longitudinal waves and transverse waves?

3. What happens to the kinetic energy of a body if the mass and velocity of the body are doubled?

4. When is the work done by a force in a body said to be negative? Give two examples.

5. A thrust of 200N exerts a pressure of 10Pa on a body. Calculate the area on which the pressure is exerted?

6. What is meant by echo? What are the conditions for the formation of an echo?

7. 8000 J of work is done by a machine to lift a mass of 100kg vertically upwards. Calculate the height to which the mass is lifted?

8. State the essential conditions needed for work to be done?

9. Derive the formula for gravitational potential energy.

10. Give the sequence of energy changes taking place in the production of electricity from a dam ?

3 MARKS QUESTIONS
1. An object of mass 80g has a volume of 20cm3. Will the object float on the water? Why? What will be the mass of water displaced by the object?
2. Give reasons:
a)Balloons filled with hydrogen rise to the ceiling.
b)Tractors have wide tyres.
c)A mug full of water appears light as long as it is under water in the bucket than when it is outside water.
3. State with reason whether work done is positive or negative in the following conditions : 

a) Work done by a man in lifting a bucket out of well by means of a pulley.

b) Work done by losing team in a tug of war.

c) Work done by an applied force on a body moving over a rough horizontal plane with uniform velocity.

d) Work done by a man in lifting a bucket out of well by means of a rope tied to a bucket

e) Work done by gravitational force in above case (d).

f) Work done by gravity on a freely falling object.

4. What kind of energy transformations taking place in the following :

(i)Burning of fuels (ii)Photosynthesis (iii)Arrow released from stretched bows.

5. Define: (i) amplitude (ii) frequency (iii) wave length.

6. What is meant by kinetic energy? Derive an expression for kinetic energy?

7. 50 waves pass through a point in 0.1 second. If the distance between one crest and the adjacent through is 0.34m, calculate frequency, wave length and wave velocity.

8. Represent graphically (a) loud sound and soft sound. (b) high pitch and low pitch sound.  

9. How much will a body of weight 35N weigh in water if it displaces 1 litre of water ?(g = 9.8m/s2)

10. (i) Which wave property determines (a) loudness (b) amplitude? 

5 MARKS QUESTIONS. 

1. a)Define power of a body . State and define the S.I unit of power.

b)Two children A and B both weighing 32kg start climbing up a rope separately and reach a height of 4m. A takes 10s and B takes 15s to reach that level. Calculate the amount of work done by A and B. Which of the two has more power? Show by calculation.

3. a) A body is floating on the surface of a liquid. With the help of a diagram

show the two forces acting on it that are responsible for its floatation.

State the relationship between these two forces in this case?

b)What is relative density? If an object is immersed wholly in a liquid causing up thrust equal to the weight of the body then what will be the relation between the relative densities of liquid and the object?

4. a)State the relation between commercial unit of energy and S.I unit of energy.

b)A man drops a 10kg rock from the top of 5m ladder. What is its K.E when it just touches the ground? What is its potential energy when it is at the top of ladder?

5. a)What is meant by ultrasound?

b)Explain the principle and working of SONAR?

6. State the law of conservation of energy. Illustrate the law by giving the example of a freely falling object.

Class 9 and 10 CBSE Maths and science Solved Papers for SA-2

CLASS IX SUMMATIVE ASSESSMENT II SAMPLE PAPERS FOR SCIENCE
1.Science_IX_Summative Assessment Term-II- Sample Paper-I
2.Science IX Summative Assessment Term-II-Sample Paper-II
3.Science IX Summative Assessment Term-II-Sample Paper-III
4.Science IX Summative Assessment Term-II-Sample Paper- IV
5.Science IX Summative Assessment Term-II-Sample Paper -V
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