Q. In what cases, does a light ray not deviate at the interface of two media?

Q. Which group elements are called carbon family?

Q. Explain Hund's rule with an example.

Q. Which plants in your surroundings are useful for the production of medicines?

Q. How do you verify that resistance of a conductor is proportional to the length of the conductor for constant cross-section area and temperature?

Q. Draw the diagram showing froth floatation method and label its parts.

Q. Give any two applications of Faraday's law of Induction in daily life.

Q. Why do we apply paint on iron articles?

Q. How much energy is transferred when $1gm$ of boiling water at ${100}^{\circ }C$ condenses to water at ${100}^{\circ }C$?

Q. Write the names of any two excretory organs in human beings.

Q. Draw a neat diagram of electric motor and name the parts.

Q. How much energy is released or absorbed when $1gm$ of water at $0^{\circ }C$ freezes to ice at $0^{\circ }C$?

Q. What is electric shock?

Q. How much energy is released or absorbed when $1gm$ of steam at ${100}^{\circ }C$ turns to ice at $0^{\circ }C$?

Q. Boiling point of water at normal atmospheric pressure is ______.

1. $0^{\circ }C$
2. ${110}^{\circ }C$
3. $-4^{\circ }C$
4. ${100}^{\circ }C$

Q. Explain the refraction of light through a glass-slab with neat ray diagram.

Q. What is the relationship between focal length $\left(f\right)$ and radius of curvature $\left(R\right)$?

Q. Draw the simple figure of a soap molecule.

Q. Explain briefly the reason for the blue colour of the sky.

Q. How does metallic character change when we move-

Q. How did you get the characters from your parents and grand-parents?

Q. How much energy is transferred when $1gm$ of boiling water at ${100}^{\circ }C$ cools to water at ${100}^{\circ }C$?

1. $2256J/g$
2. $2257J/g$
3. $2255J/g$
4. $2258J/g$

Q. Define Latent heat of Fusion.

Q. Why pure acetic acid does not conduct electricity?

Q. Define isomerism.

Q. Explain the structure of a chloroplast with the help of a rough diagram.

Q. Suggest a test to find the hardness of water and explain its procedure

Q. Explain the formation of the $B{F}_3$ molecule using hybridisation.

Q. Write the functions of spinal cord from the information collected from you school library and from internet.

Q. Which blood vessels carry blood from heart to body parts?