UK Physics

 Electric Motor ( Click on ) AC and DC Generator ( Click on )

 8. How Do Organisms Reproduce   DNA is present in the chromosomes of the nucleus and carries the information for making all of the cell’s proteins which determine the organism’s characteristics. For a cell to grow, divide and reproduce, it needs to create copies of its DNA so that it can pass on the information to its daughter cells. This process is called DNA replication. The generated DNA copies might be similar but not identical to the original, which lead to variation in the species. Such variation is the basis of evolution. Creation of DNA Copy    Modes of Reproduction   There are two modes of reproduction: Asexual Reproduction and Sexual Reproduction. Asexual Reproduction: Occurs in lower invertebrates and plants with simple organisation Involves no formation and fusion of gametes Requires a single parent Involves only mitosis division Reproductive unit is somatic cells of the parent Offspring are genetically identical to parents Often result in rapid production of a large numbe

Chemistry MCQs Questions for Class 10 with Answers  MCQ Questions for Class 10 Science Chemistry with Answers PDF Download Chapter Wise Chapter 1  Chemical Reactions and Equations Class 10  MCQ Chapter 2  Acids, Bases and Salts Class 10  MCQ Chapter 3  Metals and Non-metals Class 10  MCQ Chapter 4  Carbon and Its Compounds Class 10  MCQ Chapter 5  Periodic Classification of Elements Class 10  MCQ Biology MCQs Questions for Class 10 with Answers  MCQ Questions for Class 10 Science Biology with Answers PDF Download Chapter Wise Chapter 6  Life Processes Class 10  MCQ Chapter 7  Control and Coordination Class 10  MCQ Chapter 8  How do Organisms Reproduce? Class 10  MCQ Chapter 9  Heredity and Evolution Class 10  MCQ Chapter 14   Sources of Energy MCQ Que 

Question 1. Assertion: Brain is a delicate organ which is protected from injury. Reason: The bony box protects the brain from any shock. (a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true but R is not the correct explanation of A. (c) A is true but R is false. (d) A is false but R is true. (e) Both A and R are false. Answer (c) A is true but R is false Question 2. Assertion: Reflex Arc works faster than thinking process of brain. Reason: Reflex Arc works in case of those animals who donot have thinking process. (a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true but R is not the correct explanation of A. (c) A is true but R is false. (d) A is false but R is true. (e) Both A and R are false. Answer (c) A is true but R is false. Question 3. Which of the following acts as both endocrine and exocrine glands? (a) Adrenal (b) Pituitary (c) Ovaries (d) Pancreas Answer (d) Pancreas Question 4. Which of the following

 When do we say that an object is accelerating? What happens to the velocity of an object when it accelerates or when it is in motion? Is acceleration scalar or vector? or What is acceleration? Watch this video to know the answers  Click on

 5. Periodic Classification of Elements   Dobereiner’s Triads Dobereiner was one of the earliest scientists to find the periodicity of some elements. He arranged elements that have similar properties in groups (or “triads”) of three elements each. In these triads: • The elements were arranged in order of increasing atomic mass. • The average atomic mass of the first and third elements was close to the atomic mass of the second element. • The properties of elements were same. The three groups of Dobereiner’s triads are given in the table at the end of the page. Dobereiner’s triads, however, had several demerits. These are: • Dobereiner could identify only three such triads or groups even though there were several other elements that were known at that time. Some well-known metals like manganese, iron, copper, cobalt, nickel, zinc, silver and gold did not find a place in his triads. • Carbon has atomic mass of 12, nitrogen has 14 and oxygen has 16. According to Dobereiner’s rule, these t

Endocrine system(   Click for see ) The endocrine system is a network of   glands   and organs located throughout the body. It’s similar to the   nervous system   in that it plays a vital role in controlling and regulating many of the body’s functions. However, while the nervous system uses nerve impulses and neurotransmitters for communication, the endocrine system uses chemical messengers called hormones. Keep reading to discover more about the endocrine system, what it does, and the hormones it produces. Endocrine system function The endocrine system is responsible for regulating a range of bodily functions through the release of hormones. Hormones are secreted by the glands of the endocrine system, traveling through the bloodstream to various organs and tissues in the body. The hormones then tell these organs and tissues what to do or how to function. Some examples of bodily functions that are controlled by the endocrine system include: metabolism growth and development sexual func

 4. Carbon and Its Compounds   Specific Properties of Ethanoic Acid     Soaps and Detergents   Uniqueness of Carbon   Formation of Covalent Bonds   Difference Between Ionic and Covalent Bonds   Electron Dot Structure   Saturated and Unsaturated Carbon Compounds   Chains, Branches and Rings   Homologous Series of Carbon Compounds   Nomenclature of Carbon Compounds   Specific Properties of Ethanol   General Properties of Carbon Compounds Lesson:  Carbon and its Compounds Question: 1 Ethane, with the molecular formula  C 2 H 6   has: (a) 6 covalent bonds. (b) 7 covalent bonds. (c) 8 covalent bonds. (d) 9 covalent bonds. Solution: b Question:2 Butanone is a four-carbon compound with the functional group: (a) Carboxylic acid (b) Aldehyde (c) Ketone (d) Alcohol Solution: c Question:3 While cooking, if the bottom of the vessel is getting blackened on the outside, it means that: (a) The food is not cooked completely. (b) The fuel is not burning completely. (c) The fuel is wet. (d) The fuel is