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?

Sample Guess questions 2012 term-2 Science IX - Physics

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 X Summative Assessment Term-II-Sample Paper -V
Source :kv1madurailibrary.wordpress.com  
Guess questions term-2 Science IX SUBJECT- PHYSICS
Q1: What is the relation between speed of sound, frequency and wavelength?

Q2: Which travels faster sound of light, also discuss the speed of fastest one In solids, liquids and solids?

Q3: A source of wave produces 20 crests and 20 troughs in 0.2s. Find the Frequency of the wave?

Q4: Will a vibrating source always produce sound?

Q5: What are supersonics, infrasonic and ultrasonic waves?


Q6: Can sound waves travel through vacuum?

Q7: Does the sound of a bomb explosion travel faster than the sound produced By a humming bee?

Q8: If an observer places his ear at the end of a long pipe, he can hear two Distinct echoes when the pipe is hammered at the other end. Explain.

Q9: A ship sends out ultrasound that results from the seabed and is detected After 3.42s. If the speed of ultrasound through sea water is 1531m/s. , what is the distance of the sea bed from the ship?

Q10:What is density? Give its units.

Q11: A force of 15N is uniformly distributed over an area of 150m2. Find pressure In Pascal?

Q12: Differentiate between mass and weight?

Q13: What is the relation between thrust and pressure?

Q14: What is the relation between acceleration due to gravity and Gravitational Constant?

Q15: What happens to a body when the density of a body is equal to the density of the liquid?

Q16: A body of mass 2kg floats in a liquid, what is the buoyant force on the body?


17Q: A coolie carries a load of 50kg on his head and walks on a level road up to 100m.What is the work done by him?

18 Q: Give units of Power, Work and Energy?

19 Q: What is the commercial unit of energy?

20Q:Two bodies have their masses m1/m2 =3 and their kinetic energy E1/E2=1/3 .The ratio of their velocities are?

21Q:Prove that P=F x V where P is power, F is force and v is velocity?

22Q:An electric motor creates a tension of 4500N in hoisting a cable and reels at a rate of 2m/s. The Power of the motor is?

23 Q: State Work Energy theorem?

24. Water stored in the Bhakra dam is used to produce electric power. Explain various types of energy transformations taking place in the process.

25. How much time will a pump of 1kW power take to lift 500 litre of water to a height of 40 m? Given that density of water is 1 kg/litre and g = 10 ms-2

26.In the office room of Mohan’s father a tube of 40 W, a fan of 75 W and a cooler of 150 W have been installed. If all these appliances are used for 8 hours a day, calculate the energy consumed per day in commercial unit of energy.

26.Does the work done by gravity on an object, so as to take it to a height h, depends upon the path followed? Explain, giving an example.

Guess Questions 2012 Ch-9 FORCE AND LAWS OF MOTION

1. Which of the following statement is not correct for an object moving along a straight path in an accelerated motion?

(a) Its speed keeps changing (b) Its velocity always changes

(c) It always goes away from the earth (d) A force is always acting on it

2. According to the third law of motion, action and reaction

(a) always act on the same body (b) always act on different bodies in opposite directions

(c) have same magnitude and directions (d) act on either body at normal to each other

3. A goalkeeper in a game of football pulls his hands backwards after holding the ball shot at the goal. This enables the goal keeper to

Guess Paper Year 2011-2012 CBSE Class IX Subject- Physics

SECTION- A

Q. 1.When the passenger moving in a bus, the road side trees appear to be moving (a) Back ward
(b )Forward

Q. 2.In uniform motion the object covers (a) equal distance
(b) unequal distance

Q. 3.Where objects cover unequal distances in equal interval of time then the motion is called
(a) uniform motion
(b) non uniform motion

Q. 4.v =? (a) t/s (b) s/t