QUESTION BANK
CH- Acids, Bases and Salts
One-mark questions
Q. 1Why does dry HCl gas not change the colour of dry litmus paper?
Q. 2What affect does the concentration of H+ (aq) ions, have on the nature of the solution?
Q. 3Do basic solutions also have H+ (aq) ions? If yes, then why are these basic?
Q. 4Name the sodium compound which iss used for softening hard water?
Q. 5What is an alkali?
Two-mark questions
Q. 6Plaster of paris should be stored in a moisture- proof container. Explain why?
Q. 7Give two important uses of washing soda and baking soda?
Q. 8How does the flow of acid rain water into a river make the survival of aquatic life in river difficult?
Q. 9Solid calcium oxide was taken in a container and water was added slowly to it.
- State the two observations made in the experiment
- Write the name and chemical formula of the product formed.
Q. 10Answer
- Name the products obtained when sodium hydrogen carbonate is heated.
- Write the chemical equation for the reaction involved in the above.
Q. 11Give two ways in which salts can be prepared.
Three-mark questions
Q. 12A compound which is prepared from gypsum has the property of hardening when mixed with a proper quantity of water, identify the compound. Write the chemical equation for its preparation. For what purpose is it used in hospitals?
Q. 13Write the chemical formula of bleaching powder, how is it prepared? For what purpose is it used in paper factories?
Q. 14Name the acid present in the following:
Vinegar, Lemon, Tomato, Tarmarind, Orange, Curd
Q. 15Name the properties responsible for the following uses of baking powder.
- Baking industry
- As an antacid
- As soda-acid fire extinguisher
Q. 16A white powder which sets hard on adding water is also used in hospitals. Name this powder. How is it prepared? Write the chemical reaction involved in its preparation.
Q. 17Why do HCl3 , HNO3 etc., show acidic characters in aqueous solution while solution of compounds like alcohol and glucose do not show acidic character?
Five-mark questions
Q. 18Answer the following:
- Why does an aqueous solution of an acid conduct electricity
- How does the concentration of hydronium ions (H3O+) change when a solution of an acid is diluted?
- Which has higher pH value, a concentrated or dilute solution of hydrochloric acid?
- What do you observe on adding dilute hydrochloric acid to
- Sodium carbonate placed in test tube
- Zinc metal in a test tube?
Q. 19What is bleaching powder? How is it produced? Give its chemical equation and write 3 uses.
Q. 20What is a universal indicator? How is it used? Describe the importance of pH everyday life.
QUESTION BANK
CH- Carbon and Its Compounds
One-mark questions
Q. 1What is a hydrocarbon?
Q. 2Why covalent compounds have low melting and boiling points?
Q. 3How can you convert ethene into ethane?
Q. 4Draw the electron dot structure of N2 and NH3.
Q. 5Give the IUPAC name and write the functional group present in vinegar.
Two-mark questions
Q. 6Give two properties of ethanol. Write its formula.
Q. 7Write the structural formula for bromopentane and ethanoic acid.
Q. 8A student burns a hydrocarbon in air and obtains sooty flame. Give two reasons for this observation.
Q. 9Name the specific chemical property exclusive in case of saturated and unsaturated hydrocarbons?
Q. 10Explain substitution reaction with example.
Q. 11Why does carbon forms large number of compounds?
Three-mark questions
Q. 12What is esterification and give its uses?
Q. 13Give difference between soap and detergent.
Q. 14Giving chemical equations of the reactions write what happens when
- Ethanol is heated with excess of concentrated sulphuric acid at 443K.
- Ethanoic acid reacts with ethanol in presence of an acid
- Ester with molecular formula CH3COOC2H5 reacts with sodium hydroxide.
Q. 15An organic compound ‘X’ which is also called antifree mixture has the molecular formula C2H6O. ‘X’ on oxidation gives a compound ‘Y’ which gives effervescence with a baking soda solution. What can X and Y be? Write their structural formula.
Q. 16Write chemical equations for the following reactions:
- Conversion of oils into fats
- Oxidation of ethanol
- Ethanoic oxide with sodium hydroxide.
Q. 17Give two uses of ethanol. What is denatured alcohol?
Five-mark questions
Q. 18An organic compound ‘A’ is widely used as a preservative in pickles and has a molecular formula C2H4O2. This compound reacts with ethanol to form a sweet smelling compound ‘B’.
- Identify compound A
- Write the chemical equation for its reaction with ethanol to form compound B
- How can we get compound A and B?
- Which gas is obtained when compound A reacts with washing soda? Give the equation.
- Write an equation to obtain A back from B.
Q. 19What are soaps? Explain the mechanism of the cleansing action of soaps?
Soaps form scum with hard water. Explain why? How can we overcome this problem with the use of detergents?
Q. 20Differentiate between saturated and unsaturated hydrocarbons giving one example each.
Write general formula for the following hydrocarbons with one example for each.
- Alkene
- Alkyne
QUESTION BANK
CH- Chemical Reactions and Equations
One-word questions
Q. 1Name the reaction seen during rancidity of food.
Q. 2What is insoluble substance formed in a chemical reaction called?
Q. 3Name the products obtained when silver bromide is exposed to sunlight.
Q. 4Name the gas which burns with pop sound.
Q. 5Name the compound used to test the evolution of Carbon dioxide gas.
Two-word questions
Q. 6Product formed when A and B react together are Zinc Chloride and Hydrogen gas. Find reactant A and B?
Q. 7When quick lime is added to water a hissing sound is produced, write the chemical reaction and name the type of reaction taking place.
Q. 8What is Rancidity? What is the general name of chemical which are added to fat and oil containing food so as to prevent the development of rancidity?
Q. 9Give differences between the exothermic and endothermic reactions.
Q. 10List four changes which help us to determine whether a chemical reaction has taken place.
Q. 11FeSO4 , 7H2O green colour crystals on heating, change colour. Why?
Three-word questions
Q. 12Define displacement reaction. Give one example of it, how is it different from double displacement reaction?
Q. 13Give one example for each of the following reactions:
- Combination reaction
- Decomposition reaction
- Displacement reaction
Q. 14Give three ways used to prevent rusting.
Q. 15Define- Corrosion, Rusting and Rancidity.
Q. 16Name the type of reaction for the following:
- Vegetable matter changing into compost
- Burning of natural gas
- Adding water to quick lime to form slaked lime.
Q. 17Give the chemical equations (balanced) for the following:
- Reaction used in black and white photography.
- Reaction when glucose is oxidized.
- Formation of water from H2 and O2
Five-word questions
Q. 182g of ferrous sulphate crystals were heated in a hard glass test tube and observations recorded.
- What was the successive colour change?
- Identity the liquid droplets collected on the cooler parts of the test tube.
- What type of odour is observed on heating ferrous sulphate crystals?
- Name the products obtained on heating ferrous sulphate crystals.
- What type of reaction is taking place?
Q. 19When potassium iodide solution is added to a solution of lead (III) nitrate in a test tube, a precipitate is formed.
- What is the colour of precipitate?
- Name the compound precipitated.
- Write a balanced chemical equation for this reaction.
- What type of reaction is this?
- How it is different from displacement reaction?
Q. 20What is balanced chemical equation? Why should chemical equations be balanced?
Write the balanced chemical equations for the following reactions?
- Calcium hydroxide + Carbon dioxide Calcium carbonate + Water
- Zinc + Silver nitrate Zinc nitrate + Silver
- Barium chloride + Potassium sulphate Barium sulphate + Potassium chloride
QUESTION BANK
CH- Control and Co-ordination
One-mark questions
Q. 1What is synapse?
Q. 2Name a plant hormone that helps in stem growth.
Q. 3Write the components of central nervous system.
Q. 4Name the part of hind brain which takes part in regulation of respiration.
Q. 5Name the largest cell in human body.
Two-mark questions
Q. 6What is the difference between reflex action and walking?
Q. 7Why are some patients of diabetes treated by giving injections of insulin?
Q. 8Distinguish between involuntary and voluntary actions of our body.
Q. 9“There is a need for a system of control and coordination in an organism”. Justify the statement.
Q. 10What are the four types of tropic movements?
Q. 11What is the difference between sensory and motor nerves?
Three-mark questions
Q. 12 Mention the functions of fore brain.
Q. 13What is the role of adrenaline hormone that is secreted and released in the blood?
Q. 14How does chemical coordination occur in plants?
Q. 15How is the movement of the leaves of the sensitive plant different from the movement of a shoot towards light?
Q. 16What health disorder may occur if the following hormones are not secreted properly?
- Thyroxine b. Testosterone c. Growth hormone
Q. 17Write down three main differences between Auxin and Cytokinin.
Five-mark questions
Q. 18Draw a neat labelled diagram of human brain. Name the three major regions of human brain.
Q. 19 Differentiate between phototropism and geotropism with the help of a diagram.
Mention the role of the following hormones:
- Ethylene
- Abisicis acid
- Gibberellin
Q. 20Draw a structure of a neuron and label it.
Name the part of neuron:
- Where information is acquired
- Through which information travels as on electrical impulse.
QUESTION BANK
CH- Electricity
One-word questions
Q. 1What is the SI unit of current?
Q. 2Name the device that helps to maintain a potential difference across a conductor.
Q. 3Calculate the number of electrons constituting one coulomb of charge.
Q. 4 Which among iron and mercury is a better conductor?
Q. 5How is a voltmeter connected in the circuit to measure the potential difference between two points?
Two-word questions
Q. 6On what factors do the resistance of a conductor depends?
Q. 7How can three resistors of resistance 2Ω, 3Ω, and 6Ω be connected to give a total resistance of- a) 4Ω b) 1Ω
Q. 8Calculate the area of cross section of a wire of length 1.0m, its resistance is 23Ω and the resistivity of the material of the wire is 1.84 X 10-6 Ωm.
Q. 9Define one watt hour and one kilowatt hour.
Q. 10Give two points of difference between resistance and resistivity.
Q. 11Give two disadvantages of the heating effect of current.
Three-word questions
Q. 12What is potential difference? Give its unit with definition.
Q. 13Differentiate between conductors and insulators giving one example each.
Q. 14How much work is done in moving a charge of 4C across two points having potential difference 12V? Calculate the number of electrons flowing in it.
Q. 15What is heating effect of electric current? Find the expression of calculating ‘Heat’.
Q. 16Give the difference between series and parallel connection of resistors.
Q. 17Name the factors on which Joule’s law of heating depends.
Five-word questions
Q. 18Answer the following:
- A torch bulb is rated 2.5V and 750 mA. Calculate- (i) its power, (ii) its resistance, (iii) the energy consumed if in this bulb is lighted for 4 hours.
- Two identical resistors, each of resistance 2 ohm, are connected in torch.
- in series
- in parallel, to a battery of 12 volts. Calculate the ratio of power consumed in two cases.
Q. 19Account for the following:
- Why is series arrangement not used for domestic circuits?
- Explain why fuse wire is always connected in series arrangement.
- Why copper and aluminium wires are usually employed for electricity transmission?
Q. 20Explain:
- Why is tungsten metal not used in fuse wire but is used in bulb?
- Give one application of nichrome wire and state the reason for its use.
QUESTION BANK
CH- Hereditary and evolution
One-mark questions
Q. 1What is a trait?
Q. 2What type of reproduction gives rise to more number of successful variations?
Q. 3Who is known as the ‘Father of genetics’?
Q. 4Where are genes located?
Q. 5Name the scientist who put forth the theory of natural selection.
Two-mark questions
Q. 6Define Hereditary.
Q. 7A man with blood group A marries a woman with blood group O and their daughter has blood group. What trait- blood group A or O is dominant and why?
Q. 8What is the significance of studying homologous and analogous organs?
Q. 9What are the different ways in which individuals with a particular trait may increase in a population?
Q. 10What factors can lead to the rise of a new species?
Q. 11Why evolution should not be equated with ‘progress’?
Three-mark questions
Q. 12Outline a project when a true breeding tall plant and a true breeding short plant are crossed. Further the resulting F1 progeny is self crossed. What is the outcome or ratio of F2 progeny?
Q. 13 Explain terms homologous and analogous organs giving an example each.
Q. 14How do Mendel’s experiments show that traits are inherited independently?
Q. 15What is natural selection?
Q. 16Account for the following:
a)What is genetics?
b)Give the scientific name of the plant on which Mendel performed his experiments.
c)What did Mendel term ‘genes’ as?
Q. 17Which of the following are homologous or analogous organs?
- Wings of birds and insects
- Flippers of whale and fins of fish
- Flippers of whale and wings of bat
- Human teeth and elephant tusks
- Potato and runners of grass
- Forelimbs of horse and hands of human
Five-mark questions
Q. 18Define ‘evolution’. State Darwin’s theory of evolution.
Q. 19What are fossils? Explain the importance of fossils in deciding evolutionary relationships in detail.
Q. 20How is the sex of the child determined in human beings? Outline a cross in support of your answer.
QUESTION BANK
CH- Light- Reflection and Refraction
One-word questions
Q. 1What is the diameter of human eye?
Q. 2Define angle of prism.
Q. 3What is Tyndall effect?
Q. 4Which part of the human eye helps in changing the thickness of lens?
Q. 5What is the range of vision of normal eye?
Two-word questions
Q. 6How does eye control the amount of light entering it?
Q. 7Why danger signals are red?
Q. 8A short sighted person cannot see clearly beyond 5cm. calculate the power of lens required to correct his vision to normal?
Q. 9What is night blindness and colour blindness?
Q. 10What is internal reflection?
Q. 11A glass prism is able to produce a spectrum when white light passes through it but a glass slab does not. Explain why?
Three-word questions
Q. 12A person with a myopic eye cannot see objects beyond a distance of 1.5m. What would be the power of the corrective lens used to restore proper vision?
Q. 13Describe rainbow formation with the help of a diagram.
Q. 14Why does the sky appear blue during day time, red during sunrise and sunset and black to an astronaut?
Q. 15Distinguish between Presbyopia and Hypermetropia.
Q. 16The near point of hypermetropic eye is 80cm. What is the nature and power of the lens required to enable him to read a book placed at 25cm from the eyes?
Q. 17What is dispersion of white light and what causes it? Draw a diagram to show the dispersion of light by a glass prism.
Five-word questions
Q. 18
What is myopia? State the two causes of myopia and with the help of a labelled diagrams show:QUESTION BANK
CH- Life Processes
One-mark questions
Q. 1What are enzymes?
Q. 2In what form is food energy stored in plants and animals.
Q. 3What is the role of acid in our stomach?
Q. 4Name the muscles of stomach which regulate the release of food from stomach to small intestine.
Q. 5What is the full form of ATP?
Two-mark questions
Q. 6What is residual volume?
Q. 7What do the following transport:
- Xylem
- Pulmonary artery
- Pulmonary vein
- Vena cava
Q. 8Give any two characteristics of any respiratory surface?
Q. 9Why is respiration an exothermic reaction?
Q. 10Name the components of blood.
Q. 11Why are the walls of ventricles thicker and more muscular than the walls of artia?
Three-mark questions
Q. 12Describe double circulation in human beings. Why is it necessary?
Q. 13Differentiate between aerobic and anaerobic respiration.
Q. 14Give the events that occur during photosynthesis.
Q. 15Give difference in arteries and veins.
Q. 16What are the various types of heterotrophic nutrition? Give examples of each type.
Q. 17What causes the opening and closing of stomata? Draw a diagram showing it.
Five-mark questions
Q. 18Draw a diagram depicting Human Alimentary Canal and label the following parts:
Gall bladder Liver Pancreas
State the roles of liver and pancreas.
Name the organism which performs the following functions in human:
- Absorption of digested food
- Absorption of water
Q. 19Draw a sectional view of human heart and label the parts- Aorta, Right ventricle and Pulmonary vein.
State the functions of the following components of transport system.
- Blood
- Lymph
Q. 20Describe the structure and functioning of nephrons. Draw a diagram to support your answer.
- The eye defect myopia
- Correction of myopia using a lens
- Why is the normal eye unable to focus on an object placed within 10 cm from the eye?
Q. 19Draw a neatlabelled diagram of human eye and explain the working of each part of it.
Q. 20Account for the following:
- What is hypermetropia?
- What are the two causes of the defect of vision??
- How can this defect of the eye be corrected? Illustrate your answer by drawing ray diagrams to show the formation of image by:
- a hypermetropic eye
- ahypermetropic eye corrected with a suitable lens.
QUESTION BANK
CH- Light- Reflection and Refraction
One-word questions
Q. 21Define magnification of lens.
Q. 22What is radius of curvature of plane mirror?
Q. 23What happens if a light falls on a glass slab making 90˚ at its syrface?
Q. 24Give relation between focal length and radius of curvature.
Q. 25What is S.I. unit of power?
Two-word questions
Q. 26State the laws of reflection of light.
Q. 27Two medium with refractive index 1.31 and 1.50 are given, in which case:
- Bending of light is more.
- Speed of light is more.
Q. 28Define- Pole and Centre of curvature of spherical mirrors
Q. 29State laws of refraction of light.
Q. 30What is absolute refractive index of a medium?
Q. 31Which is optically denser out of the two mediums M1= 1.71 (refractive index) and M2= 1.36 (refractive index). How does speed of light change when it travels from optically rarer to denser medium
Three-word questions
Q. 32If the speed of light in water is 2.25 X 108 m/s and the speed in vacuum is 3 X 108 m/s. Calculate the refractive index of water.
Q. 33Draw a ray diagram to show the path of light when it travels through glass slab.
Q. 34State the mirror formula, lens formula and power of lens formula.
Q. 35What are the properties of image formed by a plane mirror?
Q. 36With the help of a ray diagram show how a pencil appears when dipped in water.
Q. 37Give three uses of concave and convex mirror each.
Five-word questions