27 January 2012

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
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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.

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