Karnataka SSLC Science Exam Solved Question Paper

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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
Solb) Solution of ammonia in water is basic and therefore changes red litmus to blue.
(Section-B 3 MARKS EACH)

11. State the observations you would make on adding ammonium hydroxide to aqueous solutions of:
a.Ferrous sulphate
Sol: (a) When ammonium hydroxide is added to ferrous sulphate solution dull green coloured precipitate of ferrous hydroxide is formed.
FeSO4 + 2 NH4OH
Ferrous sulphate + Ammonium hydroxise
Fe (OH)2 + (NH4)2 SO4
Ferrous hydroxide + Ammonium sulphate

b.Aluminium chloride.
b) When ammonium hydroxide is added to aluminium chloride solution a white gelatinous precipitate of aluminium hydroxide is formed.
AlCl3 + 3 NH4OH
Aluminium hydroxide + Ammonium hydroxide
Al (OH)3 + 3 NH4Cl
Aluminium hydroxide + Ammonium chloride

12.Define the terms and state one example of each:
1. Mineral
2. Ore
3. Gangue
Sol:1. Mineral: The substance obtained from earth’s crust which contains mixture of many metal ores in different percentages.
Example: Mica


Solved Science Karnataka SSLC Board Question Papers

Jul 13 • Board Sample Papers • 555 Views • No Comments

Board Examination require proper attention and concentration.As an engineer, I am setting following Solved Science Karnataka SSLC Board Question Papers for the purpose of providing help to the Board students. Through this paper they are able to get aware the type of questions asked in the Board Exam. While preparing this Karnataka SSLC Board Question Papers some help have been taken from previous year Board papers and sample papers like Evergreen sample papers which are based on the syllabus. To practice more, you can take help from Class X English Sample Paper for Karnataka Board.

About Karnataka Secondary Education Examination Board:
Karnataka SSLC Board Question Papers

Solved 10th Class Science Sample Paper

The Board was established in the year 1966 and conducts SSLC(Secondary School leaving Certificate) exam and other examinations. It also improve the evaluation system, publish the result etc. The performance of students in SSLC is an important factor to get admission in Higher secondary school of their choice.
Class X Science Sample Paper Karnataka Board

General Instructions:

This paper consists of three Sections A,B,C.
Section-A has questions from 1-10 each of 2 marks each.
Section-B has questions from 11-20 each of 3 marks each.
Section-C has questions from 21-24 each of 5 marks each.
All question are compulsory.

Given below the Formulas for Class X for more help. You can also visit to find more.

Section-A (2 MARKS EACH)

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
Solb) Solution of ammonia in water is basic and therefore changes red litmus to blue.
(Section-B 3 MARKS EACH)

11. State the observations you would make on adding ammonium hydroxide to aqueous solutions of:
a.Ferrous sulphate
Sol: (a) When ammonium hydroxide is added to ferrous sulphate solution dull green coloured precipitate of ferrous hydroxide is formed.
FeSO4 + 2 NH4OH
Ferrous sulphate + Ammonium hydroxise
Fe (OH)2 + (NH4)2 SO4
Ferrous hydroxide + Ammonium sulphate

b.Aluminium chloride.
b) When ammonium hydroxide is added to aluminium chloride solution a white gelatinous precipitate of aluminium hydroxide is formed.
AlCl3 + 3 NH4OH
Aluminium hydroxide + Ammonium hydroxide
Al (OH)3 + 3 NH4Cl
Aluminium hydroxide + Ammonium chloride

12.Define the terms and state one example of each:
1. Mineral
2. Ore
3. Gangue
Sol:1. Mineral: The substance obtained from earth’s crust which contains mixture of many metal ores in different percentages.
Example: Mica
2. Ore: The minerals from which a metal or more than one metal can be most economically extracted. The percentage of a metal or more than one metal is high in an ore.
Example: Bauxite – Ore of aluminium
3. Gangue: The impurities associated with the ores are collectively called gangue.
Example: Silicon dioxide is the gangue in white bauxite.

13.Mention one use of an aqueous solution of methanal in the biology laboratory
Sol: Ethanoic acid on reaction with ethanol in presence of concentrated sulphuric acid forms ethyl ethanoate (ester). This reaction is called esterification.

14.. (a) Name the four gases commonly present in biogas
(b) What are the advantages of using biogas over fossil fuels.
Sol: (a) Methane, carbon dioxide, nitrogen and hydrogen are the gases commonly present in biogas.
(b) – Biogas is a renewable resource available in nature but fossil fuels are non-renewable.
- Biogas undergoes combustion completely without leaving any residue, thus causing less pollution. Fossil fuel cause more pollution.
- Biogas is mainly produced from decomposing matter like cow dung, waste fodder, ever as coal, petroleum, gas etc are the fossil fuels.

Q.15. What is a nuclear reactor? State one function each of coolant and moderator .
Sol: A device in which electricity is produced by the process of controlled nuclear fission reaction is called nuclear reactor. There are some other nuclear reactors used for production of fissile material and research.
Function of coolant: The coolant absorbs the heat released from nuclear fission reaction and transfers it to the water present in heat exchanger. The commonly used coolants are heavy water, liquid sodium.
Function of moderator: The moderator serves to slow down the high speed neutrons moving all around the reactor core. High speed neutrons cannot be captured by a U-235 nucleus. The common moderators are heavy water and graphite.

16. (a) What is an electromagnet and what does it consist of?
Sol: (a) Electromagnet is just a solenoid with a wire wound on a soft iron core. It is a temporary magnet, it’s magnetic field can be changed, it produces strong magnetic field only for the time current is passed through it.

(b) Name one material used to make a
(i) Permanent magnet: steel and Alnico are the materials with which permanent magnets are prepared.
(ii) Temporary magnet: Soft iron is the material with which temporary magnets are prepared.

(c) How is an electromagnet made in school laboratory.
Solc)To make an electromagnet you require a long nail, insulated copper wire and a battery. Remove some insulation from the two ends of the copper wire and wind it around the nail. The more is the number of wrap, the stronger is the magnet. Then connect the two ends of the wire to the two terminals of the battery. The wire should be wrapped in one direction only because the direction of the magnetic field depends on the direction of the current. When you pass the current in the wire the nail gets magnetized

17. What is an alloy? How and why is it made? What are the constituents required and write two properties of each of the following alloys:
1. Stainless steel
2. Brass
Sol: Alloy: An alloy is a homogenous mixture of two or more metals or metals and non-metals.
Alloy is made by mixing various metals in molten state in required proportion and then cooling the mixture at room temperature.
Purpose of making alloys:
1. To prevent corrosion.
2. To increase hardness.

Stainless steel:
Composition: Iron + 0.05% C + Chromium + Nickel
Properties:
1. It is hard.
2. It does not form rust.

Brass:
Composition: Copper + Zinc
Properties:
1. It is hard and lustrous than copper.
2. More malleable and ductile than copper.

18. Name the type of fission carried out by Amoeba.
Sol: Binary fission, in which the parent animal divides during favourable conditions into two similar daughter individuals.

19. What is the difference between tropic and nastic movements in plants. Give an example.
Sol: Nastic movement is plant movement that occurs in response to environmental stimuli or to internal growth stimuli. Example: SundewTropic movements are responses to directional stimulus. Example: Plants

20. “Rapid increase of population disturbs the biotic environment” Justify this statement taking any two aspects.
Sol: -Increase of population effects food supply.
-Eco-degradation: – Over population leads to eco-degradation due to increase in population, deforestation, floods, soil erosion etc.
(Section-D 5 MARKS EACH)

21. Write the functions of the following in the digestive process:
1.Bile
2.Bicarbonate secreted by the duodenal
3.Pancreatic amylase.
Sol:1. Bile: – Bile emulsifies fats and neutralizes acids in partly digested food.
2. Bicarbonate secreted by the duodenal:- Bicarbonate secretion by the duodenal mucosa is accepted as the primary important defence mechanism against the hydrochloric acid intermittently expelled from the stomach.
3.Pancreatic amylase: – The pancreas also makes amylase (alpha amylase) to break down dietary starch into di and trisaccharides which are converted by other enzymes to glucose to supply the body with energy.

22. Give reasons for the following:
1. The glottis is guarded by epiglottis.
2. The lung alveoli are covered with blood capillaries.
3. The wall of trachea is supported by cartilage rings.
Sol:1. Epiglottis is thin elastic cartilaginous structure present on the roof of the tongue that folds over the glottis to prevent food and liquid from entering the trachea during the act of swallowing.
2. Exchange of gases takes place in alveoli of lungs The alveoli is permeable to molecular oxygen, carbon dioxide, and many other gases. Blood capillaries allow sufficient oxygen diffusion.
3. The wall of trachea is supported by cartilage rings to prevent collapse of trachea ‘C’ shaped cartilaginous rings are present.

23.1. Draw a diagram of the human urinary system and label in it: . Kidney, Ureter, Urinary bladder Urethra
2.Name the two major components of normal human urine.
Sol:Human Urine: Urine of healthy individual contains 96% of water ,2%of Urea and 2% of dissolved solids like uric acid, creatinine and inorganic salts.

24.1. Name the blood groups under ABO system.
2. Differentiate between universal donor and universal recipient under this system.
Sol: The ABO system people can be one of four types – 0, A, B or AB.
.ABO blood groups are determined by using anti-A and anti-B antibodies. A drop of anti-A is placed on one side of a clean glass slide and a drop of anti-B next to it. Then one drop of blood is mixed with each of the drops of antibodies. If the cells possess antigens which match antibodies on the slide (e.g. group A and anti-A or group B and anti-B) the cells will stick together in clumps – a positive (+) reaction. If the cells do not have the corresponding antigens there is no clumping – a negative (-) reaction. The blood
‘O’ group can donate blood to A, B, AB and O but he can receive blood from ‘O’ only. Hence, he is known as ‘Universal donor’.
‘AB’ group person can receive blood from A, B, AB and O but can donate blood to AB only. Hence, he is known as ‘Universal recipient’