Q. (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?

Q. In the reaction $CuO+H_2\to Cu+H_{2}O$ which substance gets oxidised and which gets reduced?
Give one more example of such type of reaction.

Q. (a) What is the function of acid in stomach?
(b) What is the difference between autotrophic nutrition and heterotrophic nutrition?

Q. (a) Draw a labelled diagram of a 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?

Q. Write short notes on the following.
(a) Fragmentation (b) Regeneration (c) Budding

Q. What are the renewable and non-renewable sources of energy?

Q. (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.

Q. Give the number of periods and groups in Modern Periodic Table.

Q. (a) State the names of two elements that produce nuclear energy.
(b) What are high and low tides?

Q. What two precautions should be taken to avoid the overloading of domestic electric circuits?

Q. (a) Draw a labelled diagram of neuromuscular junction.
(b) Compare nervous and hormonal mechanisms for control and co-ordination in animals.

Q. Which one has high pH value?
(i) Blood or distilled water
(ii) Gastric juice or lemon juice

Q. (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.

Q. (a) Define a spherical mirror.
(b) Distinguish between a concave mirror and a convex mirror.
(c) What is the difference between a real image and a virtual image?

Q. (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.

Q. A domestic electric circuit has a fuse of $5A$. What is the maximum number of $100W\left(220V\right)$ bulbs that can be safely used in the circuit?

Q. 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?

Q. Name a synthetic indicator.

Q. Write the name of the structure which provides nutrition to the embryo from mother's blood.

Q. 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.

Q. (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.

Q. Draw a labelled diagram to show the refraction of light when light travels from air into glass and then comes out to reach air.

Q. (a) Describe the components of an ecosystem.
(b) Explain stakeholders of resources.

Q. (a) Which metal exists in the liquid state at room temperature?
(b) Give the electronic configuration of $Mg$ and $Cl$ atoms.
(c) Show the formation of $MgC{l}_2$ by the transfer of electrons in between $Mg$ and $Cl$.

Q. (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.

Q. 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

Q. A current of $0.25A$ is flowing through a filament of an electric bulb for $20min$. Find the amount of electric charge that flows through the circuit.

Q. (a) On which factors does the resistance of a conductor depend? Define resistivity and state its SI unit.
(b) Give the value of total resistance and total current flowing in the given circuit.

Q. (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?

Q. What is the ability of the eye lens to adjust its focal length called?