Question
What is hydroelectricity? Explain the basic principle of generation of hydroelectricity with the help of a labelled diagram.
✓
Answer
The electricity generated from hydro power plant is known as hydro electricity. Water is collected in a reservoir at a height, so the water has potential energy stored in it. When the water flows down through this large height, its potential energy gets converted into kinetic energy. The fast flowing water rotates the turbine which is connected to generator through its shaft. The generator produces electricity.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
- Why do we classify elements?
- What were the two criteria used by Mendeleev in creating his Periodic Table?
- Why did Mendeleev leave some gaps in his Periodic Table?
- In Mendeleev’s Periodic Table, why was there no mention of Noble gases like Helium, Neon and Argon?
- Would you place the two isotopes of chlorine Cl- 35 and Cl- 37 in different slots because of their different atomic masses or in the same slot because their chemical properties are the same? Justify your answer.
What is biomass? Explain the principle and working of a biogas plant using a labelled schematic diagram.
The gland X which is located just below the brain in the human head secretes a chemical substance Y which controls the development of ones and muscles in the body of a person. Secretion of too little of substance Y as well as the secretion of too much of substance Y by the gland X leads to abnormal development of the body of a person.
- Name the gland X.
- What is the chemical substance Y?
- What happens if too little of substance Y is secreted?
- What happens if too much of substance Y is secreted?
- Name the system of glands in the human body of which gland X is a part.
Mita observed that her grandmother was preparing a family tree. On enquiring why it was done, she explained that it was necessary to know our roots as we have inherited many traits from our ancestors. She also mentioned that now everybody wants to live in a nuclear family and joint families have disappeared. Read the given passage and answer the following questions:
i. Name the mammal with whom human shows maximum similarity in terms of evolutionary?
ii. Mita has hazel colored eyes which match with her mother's eyes. Suggest a reason for this similarity in eye color between Mita and her mother.
iii. What values do you think children would learn in a joint family?
i. Name the mammal with whom human shows maximum similarity in terms of evolutionary?
ii. Mita has hazel colored eyes which match with her mother's eyes. Suggest a reason for this similarity in eye color between Mita and her mother.
iii. What values do you think children would learn in a joint family?
Discuss the important characteristics of covalent compounds.
- What is a solenoid? Draw a sketch of the pattern of field lines of the magnetic field through and around a current carrying solenoid.
- Consider a circular loop of wire lying in the plane of the table. Let the current pass through the loop clockwise. Apply the right hand rule to find out the direction of the magnetic field inside and outside the loop.
Four metals P, Q, R and S are all obtained by the reduction of their oxides with carbon. Metal P is used to form a thin layer over the sheets of metal S to prevent its corrosion. Metal Q is used for electroplating tiffin boxes made of metal S whereas metal R is used in making car batteries. Metals Q and R form an alloy called solder. What are metals P, Q, R and S? How have you arrived at this conclusion?
Draw a ray diagram in each of the following cases to show the formation of image, when the object is placed:
i. between optical center and principal focus of a convex lens.
ii. anywhere in front of a concave lens.
iii. at 2F of a convex lens.
State the signs and values of magnifications in the above mentioned cases (i) and (ii).
i. between optical center and principal focus of a convex lens.
ii. anywhere in front of a concave lens.
iii. at 2F of a convex lens.
State the signs and values of magnifications in the above mentioned cases (i) and (ii).
The gravitational pull of the moon cause the sea-water to rise periodically.
- What name is given to the condition of the sea when water to rise periodically.
- What name is given to the condition of the sea when its raised water recedes?
- What name is given to the energy which can be harnessed from this natural phenomenon?
- Draw labelled diagram to show how this energy can be harnessed from this natural.
Energy from various sources is considered to have been derived from the sun. Do you agree? Justify your answer.