Q. What is regeneration? Describe the process of regeneration in Planaria.

Q. Write one difference between displacement and double displacement reactions.

Q. Why do magnetic field lines not intersect each other?

Q. According to Newlands' assumption, what is the total number of elements in nature?

Q. Explain the importance of fossils in organic evolution.

Q. What is blood pressure? Give any two differences between artery and vein.

Q. Match column $A$ with $B$.

Q. What happens when:
i) $CuS{O}_4\left(aq\right)+Fe\left(s\right)\to$?
ii) $Zn\left(s\right)+H_{2}S{O}_4\left(l\right)\to$?
iii) $Na\left(s\right)+O_2\left(g\right)\to$?

Q. What do you understand by double circulation? Explain transport and exchange of oxygen and carbon dioxide with the help of schematic representation (diagram).

Q. A $12\Omega$ resistance is cut into three equal parts and then connected in triangular form. Determine the equivalent resistance between two ends of any side of the triangle.

Q. Draw circuit diagram of three resistances connected in series combination. Derive formula for equivalent resistance for this combination.

Q. Why is hypermetropia caused? How can it be corrected?

Q. A wire of a given material having length $l$ and area of cross-section $A$ has a resistance $8\Omega$. Determine the resistance of another wire of same material having length $2l$ and area of cross-section $\frac{A}{2}$?

Q. Identify $X$, $Y$ and $Z$ in the following equations :
i) $Cu+C{O}_2\stackrel{moisture}{\to }$ Green compound $\left(X\right)$
ii) $Ag+Y\stackrel{air}{\to }$ Black compound $\left({Ag}_{2}S\right)$
iii) $FeS{O}_4\stackrel{heat}{\to }{Fe}_2{O}_3+S{O}_3+Z$

Q. Write a short note on gangue and anode mud.

Q. What are the characteristics of good sources of energy?

Q. (a) What is magnetic field?

Q. (a) What are the aims of watershed management?
(b) Mention the problems caused by the construction of large dams.

Q. Mention the names of any two types of fossil fuels.

Q. Write the name of reproductive method in amoeba.

Q. Compare Mendeleev and modern periodic tables
i) on the basis of groups.
ii) on the basis of properties of elements.
iii) on the basis of classification.

Q. Draw linear diagram to obtain ratio of $F_2$ progeny as a result of crossing between tall pea plant (dominant) with short pea plant (recessive).

Q. Write the balanced equation of combustion of methane.

Q. What is phototropism? Show phototropism in plant with the help of a labelled diagram.

Q. Draw a labelled diagram of an electric generator.

Q. Draw labelled diagram of a nephron. Explain the process of urine formation.

Q. Write the name of the gland that secretes insulin hormone. What is the mechanism of control the quantity of insulin of the gland and how does it secrete?

Q. Explain the following with example :
(i) Saturated hydrocarbon
(ii) Denaturation of alcohol
(iii) Displacement reaction
(iv) Combustion of hydrocarbon
(v) Hydrogenation of unsaturated hydrocarbon.

Q. (i) Write the structural formula of acetic acid.
(ii) Write the electron dot structure of ethane.
(iii) Explain odd atom by an example.
(iv) Select unsaturated hydrocarbon in $C_2{H}_6$, $C_3{H}_4$, $C_3{H}_8$ and $C_2{H}_4$.
(v) Write a difference between soap and detergents.

Q. (a) State Snell's law for refraction of light.
(b) A concave mirror forms two times magnified and real image of an object placed at $15cm$ from its pole. Determine the distance of the image from the mirror and the focal length of the mirror.