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Why is parallel arrangement used in domestic wiring?

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Ques: Why is parallel arrangement used in domestic wiring? Ans: Parallel arrangement is used in domestic wiring because (i) Each and every appliance gets the same amount of voltage as that of the mains supply. (ii) If one component is switched off, others appliances can work properly. (iii) Fault in any branch of the connection can be easily identified. 
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How does use of a fuse wire protect electrical appliances?

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Ques: How does use of a fuse wire protect electrical appliances? Ans: The fuse wire is always connected in series combination with the live wire or electrical devices. If the flow of current exceeds the specified preset value due to some reason, then, the heat produced melts it and disconnects the circuit or the device from the mains. In this way, the fuse wire protects the electrical appliances from damage.
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NCERT Solutions Class 10 Science Chapter 8 || How do organism reproduce additional questions solution || Class 10 Chapter 8 Additional questions solution || Biology || Science ||

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Ques 1: What is the importance of DNA copying in reproduction?   Ans 1: DNA (Deoxyribonucleic acid) is the genetic material found in the chromosomes, present in the nucleus of the cell. The DNA (Deoxyribonucleic acid) is the information site for making proteins and each specific type of protein leads to the specific type of body design.  Thus, it is the DNA molecule that specifies the body design of an individual. Therefore, it can be concluded that it is the DNA that gets transferred from parents to their offsprings and makes them look similar.   Ques 2: Why is variation beneficial to the species but not necessarily for the individual?   Ans 2: Variations are beneficial to the species than individual because s sometimes for a species,  the environmental conditions change so drastically that their survival becomes difficult.   For example, if the temperature of water increases suddenly, then most of the bacteria living in that wate...
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Ncert Solutions Economics chapter 1 class 10 || Development Chapter 1 class 10 || Development || Economics || Social studies ||

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Ques 1. Development of a country can generally be determined by (i)  its per capita income (ii) its average literacy level (iii)  Health status of its people (iv)  all of the above Answer : (iv) all of the above   ( UNDP publishes the human development report(HDR) comparing the countries on the basis of educational level of the people, their health status and per capita income.  Ques 2. Which of the following neighbouring countries has better performance in terms of the human development than India?  (i) Bangladesh (ii) Sri Lanka (iii) Nepal (iv) Pakistan Answer : (ii) Sri Lanka ,  HDI(human development index) of Sri Lanka is 73 which is much higher than the Bangladesh, Nepal and  Pakistan which have 139,145 and 147 respectively.  Ques 3. Assume there are four families in a country. The average per capita income of these families is Rs 5000. If the income of three families are Rs 4000, Rs 7000 and Rs 3000 respecti...
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NCERT Solutions class 10 Science Chapter 8 || How do organism reproduce Solution Class 10 Science Chapter 8 || How do organism reproduce Solution || Biology || Science ||

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Ques 1: Asexual reproduction takes place through budding in   (a) amoeba. (b) plasmodium. (c) yeast. (d) leishmania. Ans 1: (c) Asexual reproduction takes place  in yeast through budding.   Ques 2: Which of the following is not a part of the female reproductive system in human beings?   (a) Ovary (b) Uterus (c) Vas deferens (d) Fallopian tube Ans 2: (c) Vas deferens is not a part of the female reproductive system, it is present in the male reproductive system in human beings.   Ques 3: The anther contains   (a) sepals. (b) carpel. (c) ovules. (d) pollen grains. Ans 3: (d) The anther contains pollen grains. Ques 4: What are the advantages of sexual reproduction over asexual reproduction?   Ans 4: Advantages of sexual reproduction:  » In sexual reproduction, more variations are produced. Thus, it ensures the survival of species in a population.   » The new formed individual is ha...
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NCERT Solutions Class 10 Science Chapter 7 || Control and coordination additional questions solution || Class 10 Chapter 7 Additional questions solution || Biology || Science ||

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                                  Page: 119 Ques 1: What is the difference between a reflex action and walking?  Ans 1: » A reflex action is an automatic, rapid response to a stimulus. It does not involve any thinking. For example, we close our eyes immediately when the bright light is focused on our eyes.  » Walking, on the other hand, is a voluntary action. It is u under our conscious control.  Ques 2: What happens at the synapse between two neurons?  Ans 2: A very small gap that occurs b/w the last portion of the axon of one neuron and the dendrite of other neuron is known as a synapse. It acts as an one way valve to transmit impulses in one direction only. This one-directional transfer of impulses occurs as the chemicals are produced on only one side of the neuron i.e., the axon’s side. From axon, the impulses t travels across the synapse to the dendrite of the other ne...
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NCERT solution class 10 Science Chapter 7 || Control and Coordination Solution Class 10 Science Chapter 7 || Control and Coordination Solution || Biology || Science ||

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Ques 1: Which of the following is a plant hormone?  (a) Insulin (b) Thyroxin  (c) Oestrogen (d) Cytokinin.  Ans 1: (d) Cytokinin is a hormone present in plants.  Ques 2: The gap between two neurons is called a  (a) axon. (b) synapse. (c) dendrites. (d) impulse. Ans 2: (b) The gap between two neurons is known as synapse.  Ques 3: The brain is responsible for  (a) thinking. (b) regulating the heart beat. (c) balancing the body. (d) all of the above. Ans 3: (d) The brain is responsible for neuro muscular co-ordination, thinking, regulating the heart beat and balancing the body. Ques 4: What is the function of receptors in our body? Think of situations where receptors  do not work properly. What problems are likely to arise?  Ans 4: Receptors are sensory structures (organs/tissues or cells) present all over the  body. The receptors are either grouped in case of eyes or ears, or scattered in case ...
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NCERT Solutions Class 10 Science Chapter 6 || Life processes solution || Class 10 Chapter 6 Additional questions solution || Biology || Science ||

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                                  Page: 95 Ques 1: Why is diffusion insufficient to meet the oxygen requirements of multicellular organisms like humans? Ans 1: In multi-cellular organisms, all the cells cell may not be in direct contact with the surrounding environment. Thus, simple diffusion can’t meet the requirements of all the cells. Ques 2: What criteria do we use to decide whether something is alive? Ans 2: Any visible movement such as walking, breathing, or growing, showing locomotion is generally used to decide whether something is alive or not. However, a living organism can also have movements, which are not visible to us through the naked eyes. Therefore, the presence of molecular movement inside the organisms is used to to decide whether something is alive or not. Ques 3: What are outside raw materials used for by an organism? Ans 3: An organism uses outside raw materials mostly ...
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NCERT solution class 10 Science Chapter 6 || Life process Solution Class 10 Science Chapter 6 || Life processes Solution || Biology || Science ||

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Ques 1: The kidneys in human beings are part of the system for  (a) nutrition. (b) respiration. (c) excretion. (d) transportation. Ans 1: (c) In human beings, the kidneys are part of the system for excretion.  Ques 2: The xylem in plants are responsible for  (a) transport of water. (b) transport of food. (c) transport of amino acids. (d) transport of oxygen. Ans 2: (a) In a plant, the xylem is responsible for transportation of water.  Ques 3: The autotrophic mode of nutrition requires  (a) carbon dioxide and water. (b) chlorophyll. (c) sunlight. (d) all of the above. Ans 3: (d) The autotrophic mode of nutrition requires carbon dioxide( CO 2)  , water( H 2 O) , chlorophyll and sunlight. Ques 4: The breakdown of pyruvate to give carbon dioxide, water and energy takes place in  (a) cytoplasm. (b) mitochondria. (c) chloroplast. (d) nucleus. Ans 4: (b) The breakdown of pyruvate to give  carbon dioxide( CO 2)...
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QUANTUM NUMBERS (Principal, Azimuthal, Magnetic and Spin)

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                  QUANTUM NUMBERS  Orbitals represent regions in the space around the nucleus where the probability of finding the electron is maximum. A large number of electron orbitals are possible in atom. These can be distinguished by their size, shape and orientation of the orbitals. To describe each electron in an atom in different orbitals, we need a set of three numbers known as quantum numbers. These are designated as n, l and m. In addition to these three numbers another quantum number is also needed which specifies the spin of the electron. These four numbers are called quantum numbers. These are discussed below: 1. Principal quantum number (n) :  This quantum number determines the main energy shell or level in which the electron is present. It is denoted by n. It can have whole number values starting from 1 such as n = 1, 2, 3, 4 ... This quantum number also identifies as shell. The shell with n 1 is called the first sh...
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Diagonal Relationship between Beryllium and Aluminium || Relation between Beryllium and Aluminium

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  Diagonal Relationship between Beryllium and Aluminium The ionic radius of Beryllium (Be 2+) is estimated to be nearly 31 pm; the charge/radius ratio Or e/m ratio is nearly the same as that of the Al 3+ ion. Hence beryllium resembles aluminium in these ways. Some of the similarities are given below: » Like Aluminium, Beryllium(be) is not readily attacked by acids H+ donor because of the formation of an oxide film on the surface of the metal by reacting with oxygen, i.e. they are rendered passive by nitric acid. » Beryllium hydroxide[[Be(OH)4]2] dissolves in excess of alkali to give a beryllate ion, [ Be(OH)4]2– just as aluminium hydroxide[Al(OH)3] gives aluminate ion, [Al(OH)4] » The chlorides of metals beryllium and aluminium have Cl– bridged chloride structure in vapour phase. Both the chlorides are soluble in organic solvents and are strong as Lewis acids They are used as Friedel Craft catalysts. » Beryllium(Be) and aluminium(Al) ions have strong tendency to form complexes, (Be...
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Math question

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A tower, x metre, has a flagstaff at its top. The tower and flagstaff subtends equal angles at a point distant y metre from the foot of the tower. Then find the length of the flagstaff ( in metre). 
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Solar System, Planets, Moons, Asteroid Belt,Kuiper Belt and Oort Cloud, Comets and Meteoroids

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 The solar system consists of the Sun, which is a star at its center, and all the celestial bodies bound by its gravitational pull. These bodies include planets, moons, asteroids, comets, and other objects. Key Components of the Solar System: The Sun : The Sun is the center of the solar system and contains about 99.86% of its mass. It is a star primarily composed of hydrogen and helium, providing the heat and light that sustains life on Earth. Planets : There are eight recognized planets in the solar system: Mercury : The closest planet to the Sun, known for extreme temperature variations and no atmosphere. Venus : Similar in size to Earth but with a thick, toxic atmosphere and surface temperatures hot enough to melt lead. Earth : The third planet from the Sun, the only known planet to support life, with water and a breathable atmosphere. Mars : Known as the Red Planet, it has a cold, dry surface and signs of past water. Jupiter : The largest planet, a gas giant, w...
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