Q. Draw a sketch of petrol engine and label the parts :

Q. $C_{10}{H}_{22}\stackrel{Temperature}{\to }{C}_5{H}_{12}+x$

1. $C_5{H}_{10}$
2. $C_5{H}_{12}$
3. $C_5{H}_8$
4. $C_5{H}_5$

Q. Match the items of list 1 with items of list 2. Write correct answer in the space provided.

Q. In an experiment of photoelectric effect the number of photoelectrons has to be increased without changing their frequency. The suitable step to be taken about the incident radiation for this is

1. increase frequency without increasing intensity
2. increasing intensity without changing frequency
3. increasing only frequency
4. increase both frequency and intensity

Q. Describe the experiment conducted by Sir C.V. Raman to demonstrate Raman effect. What is the use of this effect?

Q. The common raw material used in the preparation of soap and detergent is:

1. sodium hydroxide
2. sulphuric acid
3. stearic acid
4. long chain hydrocarbons

Q. How do you test that water supplied to your home is temporarily hard water?

Q. In echo cardiography (ECG) the frequency of the sound waves used is

1. $20Hz$ to $20kHz$
2. $20Hz$ to$2kHz$
3. Beyond $20kHz$
4. Below $20kHz$

Q. Explain the steps involved in the manufacture of cement.

Q. The device used to provide electricity in the instruments of artificial satellites is ...........................

Q. Name our Galaxy.

Q. In centrifuge how are particles of different densities separated?

Q. The more doped region in the transistor is ...........................

Q. State the universal law of gravitation. Write the mathematical expression of this law.

Q. Detergents are more efficient than soaps in cleaning, yet you have to limit the use of detergents because:

1. they are costly
2. they are not ecofriendly
3. they produce scum in hard water
4. their production cost is high

Q. In Kaiga Atomic Power reactor plant, the fuel that can be used is

1. Coal
2. Uranium
3. Natural gas
4. Petrol

Q. What is centripetal force?

Q. Polymer used to make gasket of pressure cooker is:

1. thiokol
2. polythene
3. nylon
4. teflon

Q. Karnataka Government has undertaken a programme of distributing fluorescent tubes. How is it a remedy for energy crisis?

Q. What should be the angle between thumb (main) finger, forefinger and central finger in Fleming's left hand rule? What does each finger indicate?

Q. The velocity of ultrasound in water is 1.5 km/s. The distance travelled by it in water in 3 seconds is ...........................

Q. State the difference between laser light and ordinary light

Q. Explain the process of obtaining crystalline silicon with chemical equation.

Q. Draw a neat diagram of AC dynamo and represent the current in it in the external circuit by a graph.

Q. Which of the following engines is more efficient?

1. Heat utilised - 80 kilojoules , work done - 32 kilojoules
2. Heat utilised - 50 kilojoules , work done - 25 kilojoules
3. Heat utilised - 90 kilojoules , work done - 27 kilojoules
4. Heat utilised - 60 kilojoules , work done - 12 kilojoules

Q. A student dips a zinc plate in copper sulphate solution. Write the equation of the chemical reaction taking place. Which metal is displaced during this reaction?

Q. Write the equation of chemical reaction taking place when hard water containing calcium chloride is passed through permutit.

Q. To distinguish between real gems and artificial gems a merchant may use which of the following radiations?

1. Infrared rays
2. $\gamma$-rays
3. X-rays
4. Ultraviolet rays

Q. The function of carburettor is to allow

1. only petrol into the engine
2. only air into the engine
3. diesel and air into the engine
4. mixture of petrol and air into the engine

Q. Draw a block diagram of a simple radio receiver