2016
Write the two components of baking powder.
Write the name of reproductive process in the plants which have lost the capacity to produce seeds.
Write the atomic weight of chlorine isotopes.
In the following strong acid and strong alkaine base is- ¼½+½=1½
(a) Acetic Acid or Hydrochloric Acid
(b) Sodium hydroxide or calcium hydroxide
The magnetic field in a given region is uniform. Draw a diagram to represent it.
Write the name of acidic oxides which are responsible for acid rain.
A current through a horizontal power line flows east to west direction. What is the direction of
magnetic field at a point directly below it?
What is combination reaction? Write combination reaction of quick lime with water.
Write four characterstics of the good source of energy.
In night which type of beam of light is used by drivers and why? Explain it.
Describe homologous organs with the help of example.
Why do we have two eyes for vision and not just one? Explain the fact on the basis of –
(a) Field of view
(b) Dimensional view
Write the definition of fossils and explain the process of dating of fossil.
(a) Write the chemical reaction of the photosynthesis and events occure during the process.
(b) Which type of mirror is used in head lights of vehicles?
(a) Which hormone is secreted by Adrinal glands? Write any one function of this hormone.
(b) Write any two function of betteries in vehicle
What is redox reaction? In the reaction ZnO+C→Zn+CO which substance gets oxidised and which
gets reduced?
(a) Write down formula for the magnification obtained by a spherical mirror.
(b) Name a mirror that can give an erect and enlarged image of an object.
(c) Define the principle focus of a convex mirror
Draw a labelled diagram of reflex arc and explain reflex action.
If an egg is not fertilized then what happens? Explain it.
Write Newland’s Law of Octaves.
Write the name of element having similar properties of the following.
(a) Nitrogen
(b) Lithium
What is pH Scale? Explain that pH change of the mouth is cause of tooth decay.
An electric refrigerator rated 600 W operates 8 hour/day. What is the cost of the energy to operate it
for 30 days at Rs. 4.00 per KWh?
(a) What do you mean by food chain?
(b) Explain the food chain in grassland with an example.
(c) Explain the energy flow in an ecosystem with help of diagram.
(a) Which metal exists in liquid state at room temperature ?
(b) Write electronic configuration of nitrogen and chlorine atoms.
(c) Show the formation of sodium chloride by the transfer of electrons between nitrogen and
chlorine atoms.
Define alternating current and explain working of the device which produces it. Draw labelled
diagram. Describe the change in direction of current.
(a) Draw a labelled diagram of human respiratory system.
(b) Explain the transportation of oxygen and carbon dioxide in human beings.
Or
(a) What is respiration?
(b) Draw a labelled diagram of cross section of leaf.
(c) Explain the transportation of food and other substances in plants.
(a) Draw ray diagram of refraction of light through a prism and explain the phenomenon of
dispersion of light.
(b) Write the formula for lens power and define its unit.
Or
(a) Explain the following-
(i) Atmospheric refraction and advance sunrise.
(ii) Tyndall effect.
(iii) Draw the ray diagram of an eye suffering from short sightedness.
(a) Write molecular formula of benzene.
(b) Draw structure formula of benzene and write number of triple bonds present in it.
(c) Which is ethane in the following? Write number of co-operative bonds present in it.
(i) C2H2 (ii) C2H4 (iii) C2H6
OR
(a) Write molecular formula of cyclohexane.
(b) Draw structure formula of cyclohexane and write number of co- operative bonds
present in it.
(c) Which is ethene in the following? Write number of double bonds present in it.
(i) C2H2 (ii) C2H4 (iii) C2H6
2015
Name two synthetic indicators.
Write the name of the structure which provides nutrition to the embryo from mother’s blood.
Give the number of periods and groups in Modern Periodic Table.
Which one has high pH value — (i) Blood or distilled water ? (ii) Gastric juice or lemon juice ?
What two precautions should be taken to avoid the overloading of domestic electric circuits ?
What are the renewable and non-renewable sources of energy ?
A domestic electric circuit has a fuse of 5A. What is the maximum number of 100 W ( 220 V ) bulbs that can be safely used in the circuit ?
What is the ability of the eye lens to adjust its focal length called ?
Write combination reaction and decomposition reaction with one example each.
(a) State the names of two elements that produce nuclear energy. (b) What are high and low tides ?
(a) Ozone layer provides protection from which radiation coming from the sun ? (b) What are the advantages of using disposable paper cups instead of disposable plastic cups ?
What factors could lead to the rise of a new species ? Explain.
A current of 0·25 ampere is flowing through a filament of an electric bulb for 20 min. Find the amount of electric charge that flows through the circuit
Draw a linear diagram of sex determination in human beings
(a) What is the function of acid in stomach ? (b) What is the difference between autotrophic nutrition and heterotrophic nutrition ?
(a) Draw a labelled diagram of neuromuscular junction. (b) Compare nervous and hormonal mechanisms for control and co-ordination in animals.
In the reaction CuO + H 2 → Cu + H 2O which substance gets oxidised and which gets reduced ? Give one more example of such type of reaction.
(a) Define a spherical mirror.
(b) Distinguish between a cancave mirror and a convex mirror.
(c) What is the difference between a real image and a virtual image ?
(a) Draw a diagram indicating the position of four endocrine glands in human being. (b) Write the function of insulin and thyroxine hormones in human being.
What is dispersion of white light ? What is the cause of such dispersion ? Draw a diagram to show the dispersion of white light by a glass prism.
Write short notes on the following : (a) Fragmentation (b) Regeneration (c) Budding.
What changes occur in the following on going from left to right in a period of the Periodic Table ? (i) Atomic size (ii) Metallic character (iii) Number of valence electrons.
Zinc produces gas X on reaction with sulphuric acid — (i) Name the gas X. (ii) Write the equation of the reaction. (iii) How will you identify gas X ?
Draw a labelled diagram to show the refraction of light when light travels from air into glass and comes back into air.
(a) Describe the components of an ecosystem. (b) Explain stakeholders of resources.
(a) Which metal exists in liquid state at room temperature ? (b) Give the electronic configuration of Mg and Cl atoms. (c) Show the formation of MgCl 2 by the transfer of electrons in between Mg and Cl.
(a) Write Fleming’s left-hand rule for the direction of force on a current carrying conductor placed in a magnetic field. (b) Draw a diagram to show lines of magnetic field inside and around a current carrying solenoid. (c) Write the names of four devices where current carrying conductor is used along with magnetic fields.
(a) Draw a labelled diagram of sectional view of the human heart. (b) Describe double circulation in human beings. Why is it necessary ? (c) What would be the consequences of deficiency of haemoglobin in our body ?
OR
(a) Draw a labelled diagram of human alimentary canal. (b) Explain the digestion of fat in our body. Where does this process take place ? (c) What is the role of saliva in the digestion of food ?
On which factors does the resistance of a conductor depend ? Define resistivity and state its SI unit.
(a) State Joule’s law of heating. Name two gases which are filled in electric bulbs and explain why these gases are filled in electric bulbs. (b) An electric iron consumes energy at a rate of 840 W, when heating is at the maximum rate. The voltage of electric source is 220 V. Calculate the value of current and the resistance.
(a) Write three properties of homologous series. (b) Identify alkene and alkyne from the following : (i) C 2 H 6 (ii) C 3 H 4 (iii) C 3 H 6 (iv) C 3 H 8. (c) Draw electron dot structure of ethene.
OR
(a) Write two features of carbon which lead to form huge number of compounds. Write the nature of bond in organic compounds. (b) Give the formula of two higher homologues of ethane. (c) Draw the electron dot structure of ethane.
2014
Out of sodium, chlorine and silicon which one is metalloid ?
What is the value of pH for a neutral solution ?
Write the name of acid secreted from sting of ant.
Which type of fission is found in Plasmodium ?
What is the main factor of sharply dropping the amount of ozone in the atmosphere ?
Draw a labelled diagram of an electric generator.
What happens on connecting too many appliances at a time to a single socket ?
A charge of 300 C is drawn by a filament of an electric bulb for 5 minutes. Find the amount of electric current flowing through the circuit.
(a) Give one example of redox reaction.
(b) Draw the labelled diagram of electrolytic decomposition of water.
Which type of energy sources are fossil fuels ? Write down any two names of fossil fuels.
Write any two events occurring during the process of photosynthesis.
What are homologous and analogous organs ? Write their examples.
What is vegetative propagation ? Write one advantage of vegetative propagation.
(i) Why does the sky appear dark to an astronaut ? (ii) Which part of an eye adjusts the size of its pupil ?
(a) Give the name of the gas evolved when sodium hydroxide reacts with zinc metal. Write the equation also.
(b) Which is used in the following ?
(i) To make drinking water free from germs
(ii) For making tasty crispy Pakoras in kitchen
(iii) To remove permanent hardness of water
(iv) For making toys and decorative materials.
(a) What is displacement reaction ? (b) Identify A in the following reactions :
(i) Zn + CuSO 4 → A + Cu (ii) Na 2SO 4 + BaCl 2 → A + 2 NaCl.
(a) Define Isotope.
(b) Write the names of two inert gases.
(c) An element has 2, 8, 2 electronic configuration. Write its group number and valency.
What is an artificial kidney / haemodialysis ? Write the use of haemodialysis.
What is budding ? Explain the budding in Hydra by the help of diagram
Write the names of male and female sex hormones. Draw a labelled diagram of male endocrine glands.
Describe three types of ‘R’ to save the environment.
Define the principal focus of a concave mirror. Write two uses of a convex mirror.
State Ohm’s law. Describe an experiment to verify this law
Two lamps one rated 60 W, 220 V and the other 40 W, 220 V are connected in parallel to a 220 V electric supply mains. What is the total current drawn from the electric mains if the voltage of electric supply is 220 V ?
(a) Explain the following :
(i) Roasting (ii) Calcination.
(b) What are amphoteric oxides ? Write the name of such one oxide.
(c) By which two metals is brass alloy formed ?
Define food chain. Describe the flow of energy in an ecosystem with the help of a linear diagram.
Write right-hand thumb rule. Draw necessary diagram to show lines of magnetic field inside and around a current carrying solenoid. How an iron rod can be converted into a magnet by using current carrying solenoid ? Describe it giving suitable diagram.
(a) What do you mean by covalent bond ? (b) Write the electron dot structure of methane and ethene. (c) Explain the following with example : (i) Addition reaction (ii) Displacement reaction.
(a) Write the dehydration reaction of ethanol and write the name of dehydrating agent.
(c) Draw the structure of soap molecule.
Draw a labelled diagram of the neuron and describe the structure of neuron in detail.
OR
What are aerobic and anaerobic respiration ? Describe the breakdown of glucose molecule by various pathways.
(a) Define the power of lens.
(b) Draw a ray diagram for formation of image of an object situated at a point in between 2 f 1 and f 1 distances from the optical centre of the concave lens and write the nature of the image formed.
(c) What happens when light is falling perpendicular by to an interface of two media ?
Name the two major defects of an eye. Explain causes of their development and discuss methods of their correction