| 27th October 2014 02:09 PM | |
| Arvind Kumar | Re: Paper for SSLC Science Here I am giving you question paper for Karnataka SSLC Board science subject examination in a PDF file attached with it so you can get it easily. 1. Name the product other than water formed on burning of ethanol in air. Sol: When ethanol burns in air carbon dioxide is the product formed along with water. C2H5OH + 3O2 → 2CO2 + 3H2O Ethanol + Oxygen → Carbon Dioxide + Water 2. How can you show that the magnetic field produced by a given electric current in the wire decreases as the distance from the wire increases? Sol: When a compass needle is brought near a current carrying conductor, it shows deflection. As we move the needle away from the wire, the magnitude of the deflection in the compass decreases, which shows that the magnetic field produced by a given electric current in the wire decreases as the distance from the wire increases. 3.Why does magnesium powder react much more rapidly than magnesium ribbon with dilute sulphuric acid? Sol: Magnesium powder reacts more rapidly than magnesium ribbon as surface area increases in powder. As a result more magnesium atoms are exposed to dilute sulphuric acid resulting in faster reaction. 4. An object is placed at a distance of 12 cm in front of a concave mirror. The real image formed is four times larger than the object.What is the distance of the image from the mirror. Sol: Given, object distance, u= -12 cm and magnification, m = -4 Image distance, v= ? Magnification, M = – v / u -4 = – v / – 12 = -48 cm Hence, the image is at a distance of 48 cm in front of mirror. 5.(1) Draw a diagram to show how two resistors R1 and R2 are connected in series. (2) If the two resistors of 5 ohm and 10 ohm are connected in series, What is the currents passing through the two resistors. Sol:- In series combination the current through all the resistors will be same. So, the current passing through the two resistors are in the ratio 1: 1 6.A bulb is rated at 5.0 volt, 100 m A. Calculate its (i) power and (ii) resistance. Sol: The rated voltage of the bulb, V = 5.0 volt and the rated current, I = 100 mA Power of the bulb, P = VI P = 5 x 0.1 P = 0.5 watt The resistance of the bulb,R – v / I R = 5 / 0.1 R = 50 ohm 7. By which nuclear reaction does the Sun produce its energy. What are the two conditions responsible for this reaction. Sol: Nuclear fusion reaction takes place in the sun which produces enormous amount of heat energy.The two conditions which are present at the centre of the sun are presence of nuclei of hydrogen and high temperature. 8. Given below are the pH values of four different liquids:7.0, 14.0, 4.0, 2.0 which of these could be that of 1. Lemon juice, 2. Distilled water, 3. 1 M sodium hydroxide solution, 4. Tomato juice Sol: 1. pH of lemon juice is 2.0 as it is strongly acidic. 2. pH of distilled water is 7.0 as it is neutral. 3. pH of 1M sodium hydroxide solution is almost 14 as it is a strong base. 4. pH of tomato juice is 4.0 as it is moderately acidic. 9. Distinguish between natural and artificial satellites.What is the minimum horizontal velocity required for the push to launch an artificial satellite? Sol: A natural satellite is any small natural body that revolves around a planet. Moon is the natural satellite of earth whereas artificial satellite is a man made object that revolves around earth. The horizontal velocity required for the push is 7.92 km/s. 10. What is the action on litmus of: (a) Dry ammonia gas Sol:.(a) Dry ammonia gas has no effect on litmus and do not show any change of colour. (b) Solution of ammonia gas in water Sol  b) Solution of ammonia in water is basic and therefore changes red litmus to blue.Karnataka SSLC Board science paper     pdf file atteched............. |
| 27th October 2014 01:26 PM | |
| Unregistered | Paper for SSLC Science Will you please provide me question paper for Karnataka SSLC Board science subject examination in a PDF file format ? |
