Q. Write the two components of baking powder.

Q. (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.

Q. An electric refrigerator rated $600W$ operates $8hours/day$. What is the cost of the energy to operate it for $30$ days at $Rs.4.00perkWh$?

Q. State Newland's Law of Octaves. Write the name of the element having similar properties to the following:
(a) Nitrogen
(b) Lithium

Q. Match the column X to column Y

Column X (Physical Quantity/Law)	Column Y (formula)
(i) Electric current	(a) $R=R_1+R_2+R_3$
(ii) Potential difference	(b) $\rho =RA/l$
(iii) Ohm's Law	(c) $\frac{1}{R}=\frac{1}{R_1}+\frac{1}{R_2}$
(iv) Resistivity	(d) V=W/Q
(v) Series combination of resistor's	(e) I=Q/t
(vi) Parallel combination of resistor's	(f) V=IR

Q. In the given circuit diagram calculate the current $I_2$ through the resistor of $10\Omega$.

Q. 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?

Q. What is $pH$ Scale? Explain that $pH$ change of the mouth is the cause of tooth decay.

Q. What is redox reaction? In the reaction $ZnO+C\to Zn+CO$ which substance gets oxidised and which gets reduced?

Q. Write the name of acidic oxides which are responsible for acid rain.

Q. Which hormone is secreted by adrenal glands? Write any one function of this hormone.

Q. In the following strong acid and strong alkaine base is-
(a) Acetic Acid or Hydrochloric Acid
(b) Sodium hydroxide or calcium hydroxide

Q. Write four characteristics of the good source of energy.

Q. (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.

Q. Describe homologous organs with the help of example.

Q. The magnetic field in a given region is uniform. Draw a diagram to represent it.

Q. At night, which type of beam of light is used by drivers and why? Explain it.

Q.

Write the chemical reaction of photosynthesis and events occured during the process.

Q. 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

Q. Write the definition of fossils and explain the process of dating of fossil.

Q. Draw a labelled diagram of reflex arc and explain reflex action.

Q. (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.

Q. If an egg is not fertilized then what happens? Explain it.

Q. What is a combination reaction? Write combination reaction of quick lime with water.

Q. Define alternating current and explain working of the device which produces it. Draw labelled diagram. Describe the change in direction of current.

Q. (a) Draw a labelled diagram of human respiratory system.
(b) Explain the transportation of oxygen and carbon dioxide in human beings.

Q. Write the name of reproductive process in the plants which have lost the capacity to produce seeds.

Q. (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.

Q. (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.

Q. Write the atomic weight of chlorine isotopes.