Description : What is the element required for solar energy conversion? (1) Beryllium (2) Tantalum (3) Silicon (4) Ultra pure carbon
Last Answer : (3) Silicon Explanation: The most prevalent bulk material for solar cells is crystalline silicon (abbreviated as a group as c-Si), also known as "solar grade silicon". Bulk silicon is ... into multiple categories according to crystallinity and crystal size in the resulting ingot, ribbon, or wafer.
Description : The element required for Solar energy conversion - (1) Beryllium (2) Silicon (3) Tantalum (4) Ultra pure carbon
Last Answer : (2) Silicon Explanation: Energy conversion. n. (General Physics) is the process of changing one form of energy into another, such as nuclear energy into heat or solar energy into electrical energy.
Description : What is the element required for solar energy conversion ? (1) Beryllium (2) Tantalum (3) Silicon (4) Ultra pure carbon
Last Answer : Silicon
Description : Necessary element of change in solar energy to electric energy – (1) Berilliurn (2) Silicon (3) Tantelum (4) Pure Copper
Last Answer : (2) Silicon Explanation: A small solar electric or photovoltaic (PV) converts solar energy into electrical energy. Solar cells consist of semiconductor materials which work on photoelectric effect. Silicon remains the most popular material for solar cells.
Description : Necessary element of change in solar energy to electric energy (1) Berillium (2) Silicon (3) Tantelum (4) Pure Copper
Description : The element found in the surface of the Moon is – (1) Tin (2) Tungsten (3) Tantalum (4) Titanium
Last Answer : (4) Titanium Explanation: Elements known to be present on the lunar surface include, among others, oxygen(O), silicon (Si), iron (Fe), magnesium (Mg), calcium (Ca), aluminium (Al),manganese (Mn) and titanium (Ti).
Description : Consider the following statements: 1. The atmosphere of the primitive earth was reducing 2. The primary source of energy for the chemosynthetic reactions on earth that led to the origin of life was the solar energy 3. Liquid water did not ... 1 and 2 (b) 1 and 4 (c) 1, 2, and 3 (d) 1, 3, and 4
Last Answer : Ans:(d)
Description : Emeralds contain the element (a) carbon (b) silica (c) beryllium (d) gold
Last Answer : Ans:(c) Physics
Description : The element with the least atomic size from Carbon, Nitrogen, Boron and Beryllium is
Last Answer : Nitrogen.
Description : Which one of the following elements has valence electrons in the n = 3 shell? A beryllium B oxygen C silicon D neon E hydrogen
Last Answer : C silicon
Description : Which of the following finds the least commercial use? (A) Pure iron (B) High silicon iron (C) Low carbon steel (D) High carbon steel
Last Answer : (A) Pure iron
Description : The element used for making solar cells is - (1) Magnesium (2) Sodium (3) Calcium (4) Silicon
Last Answer : (4) Silicon Explanation: Materials presently used for photovoltaic solar cells include mono-crystalline silicon, polycrystaijhne silicon, amorphous silicon, cadmium telluride, and copper indium selenideisulfide.
Description : The element used for making solar cells is (1) Magnesium (2) Sodium (3) Calcium (4) Silicon
Description : Mention the methods of obtaining ultra pure metal.
Last Answer : a) Fractional crystallization or zone refining. b) Vacuum melting c) Distillation d) Chemical vapour deposition e) Liquation process
Description : A sharp moving boundary is obtained between the pure solvent and solute containing layer in (A) Chromatography (B) Immuno Reactivity (C) Ultra Centrifugation (D) Solubility curve
Last Answer : Answer :C
Description : with which element Beryllium shows diagonal relation ship?
Last Answer : Ans : Al
Description : Which of the following is the element represented by the symbol B? w)Barium x)Bismuth y)Boron z)Beryllium
Last Answer : ANSWER: Y -- BORON
Description : What is the sign of tantalum ?
Last Answer : Ta tantalum signal
Description : What is Tantalum Capacitor ?
Last Answer : Tantalum capacitor is a special type of electrolytic capacitor that uses tantalum ( Ta) and titanium ( Ti) metals instead of aluminum ( Al) . These capacitors are long-lived and have very low leakage current , small in size but high capacitance.
Description : What is melting point of tantalum?
Last Answer : What is the answer ?
Description : Reactor used in the production of polyvinyl chloride (PVC) is made of (A) Nickel or glass lined steel (B) Aluminium (C) Tantalum (D) Lead
Last Answer : (A) Nickel or glass lined steel
Description : __________ has the highest melting point out of the following. (A) Tungsten (B) Zirconium (C) Molybdenum (D) Tantalum
Last Answer : Option A
Description : The element present in the largest amount in rocks and minerals is - (1) carbon (2) silicon (3) hydrogen (4) aluminium
Last Answer : (2) silicon Explanation: Silicon is the eighth most common element in the universe by mass, but very rarely occurs as the pure free element in nature. It is most widely distributed in dusts, sands, planetoids, and planets as various forms of silicon dioxide (silica) or silicates.
Description : __________ is the most important element, which controls the physical properties of steel. (A) Manganese (B) Silicon (C) Carbon (D) Vanadium
Last Answer : (C) Carbon
Description : The yield point phenomenon observed in annealed low carbon steel is due to the presence of the following element. (A) Silicon (B) Carbon (C) Phosphorous (D) Chromium
Last Answer : Option B
Description : In which form is Silicon most frequently found in nature? w) The free element Silicon x) Silicon-Oxygen compounds y) Silicon-Carbon compounds z) Silicon-Metal compounds
Last Answer : ANSWER: X -- SILICON-OXYGEN COMPOUNDS
Description : How do beryllium carbon and oxygen produce star?
Last Answer : They don't. But stars do produce Beryllium, Carbon and Oxygen.Stars start with Hydrogen, which undergoes atomic fusion, andproduces Helium. As helium builds up in the sun's core, otherfusion ... on. Stars the size of thesun do not contain enough energy to produce elements heavier thanoxygen.
Description : How the elements beryllium carbon and oxygen produces stars such as the sun?
Last Answer : It is not specifically those elements which "produce stars".Whatever elements happen to be around clump together, throughgravity, and form the star.
Description : Which of the following elements forms a tetrahedra structure? w) carbon x) beryllium y) boron z) fluorine
Last Answer : ANSWER: W -- CARBON
Description : _________ is the hardest oxide and is hence used where high wear resistance at high temperature is required. (A) Beryllium (B) Zirconia (C) Alumina (D) Magnesia
Last Answer : (C) Alumina
Description : Which of the following parts of the sunlight makes the solar cooker hot? (1) Ultra violet (2) Red light (3) Infra red (4) Cosmic rays
Last Answer : (3) Infra red Explanation: Glass transmits visible light but blocks infrared thermal radiation from escaping. This amplifies the heat trapping effect. A solar cooker, or solar oven, is a device which ... The vast majority of the solar cookers presently in use are relatively cheap, low-tech devices.
Description : Pick out the wrong statement pertaining to 'green house' for the plants. (A) 'Green house' (made of glass) allows visible sunlight (i.e., short wavelength solar radiation like ultra-violet rays) ... ' thereby warming up the earth's surface (D) 'Green house' is colder than the outside atmosphere
Last Answer : (D) 'Green house' is colder than the outside atmosphere
Description : Which of the following parts of the sunlight makes the solar cooker hot ? (1) Ultra violet (2) Red light (3) Infra red (4) Cosmic rays
Last Answer : Infra red
Description : Silicon is used in which of the following? (1) Semiconductors (2) solar energy devices (3) transistors (4) All of these
Last Answer : (4) All of these Explanation: Silicon is a chemical element (its symbol in chemical formula expressions is "Si") that is present in sand and glass and which is the best known semiconductor material in electronic components. Its atomic number is 14.
Description : Which of the following has the highest energy? A. gamma rays (Answer) B. X-rays C. Ultra-violet radiation D. radio waves
Last Answer : A. gamma rays (Answer)
Description : The sun is made up of 99.9% of -------- and -------? A. Oxygen and Hydrogen B. Hydrogen and Sulfur C. Carbon and Silicon D. Hydrogen and Helium (Answer)
Last Answer : D. Hydrogen and Helium (Answer)
Description : Which of the following elements is not present abundantly in earth’s crust ? A. Silicon B. Radium (Answer) C. Aluminum D. Carbon
Last Answer : B. Radium (Answer)
Description : For which of the following substances, the resistance decreases with increase in temperature? (1) Pure silicon (2) Copper (3) Nichrome (4) Platinum
Last Answer : (3) Nichrome Explanation: Nichrome has high resistance and it is called a resistor.
Description : Write the basic chemical reaction in the epitaxial growth process of pure silicon.
Last Answer : The basic chemical reaction in the epitaxial growth process of pure silicon is the hydrogen reduction of silicon tetrachloride. 1200C SiCl4 + 2H2 Si + 4 HCl
Description : Pure semiconductors silicon and germanium are a) Extrinsic b) Intrinsic c) Insulator d) Diodes
Last Answer : b) Intrinsic
Last Answer : Nichrome
Description : If temperature of a pure silicon specimen is increased, then (a) only number of free electrons increase. (b) only number of free holes increase. (c) number of free holes and free electrons increases. (d) only number of free holes decrease.
Last Answer : Number of free holes and free electrons increases.
Description : Impurity atoms to be added to pure silicon in order to make a p-type semiconductor belongs to (a) Phosphorous (b) Boron (c) Antimony (d) Aluminium
Last Answer : Boron , a group three element.
Description : Pure silicon is (a) a p-type semiconductor (b) an n-type semiconductor (c) an intrinsic semiconductor (d) an extrinsic semiconductor
Last Answer : Pure silicon is an intrinsic semiconductor because its own electrons are responsible for conduction.
Description : The principle involved in the conversion of solar energy into electrical energy is called
Last Answer : photo voltaic effect.
Description : The process of photosynthesis involves conversion of (1) chemical energy into radiant energy (2) chemical energy into mechanical energy (3) solar energy into chemical energy (4) mechanical energy into solar energy
Last Answer : (3) solar energy into chemical energy Explanation: Photosynthesis is the process by which light energy is converted into chemical. Energy by organisms. Carbon dioxide, and water are the raw materials of this process. The light energy comes from the sun and its end products are oxygen and glucose.
Description : Conversion of sound energy into electrical energy is done by – (1) Solar cell (2) Gramophone (3) Microphone (4) Loudspeaker
Last Answer : (3) Microphone Explanation: Conversion of sound energy into electrical energy is done by microphone.
Description : The energy conversion efficiency of a solar cell does not depend on a) solar energy insolation b) inverter c) area of the solar cell d) maximum power output
Last Answer : b) inverter
Description : Which of the following is not covered in 8 missions under the Climate Action Plan of Government of India? (A) Solar power (B) Waste to energy conversion (C) Afforestation (D) Nuclear energy
Last Answer : (D) Nuclear energy
Description : Which one of the following non-conventional energy sources can be exploited most economically? (A) Solar (B) Wind (C) Geo-thermal (D) Ocean Thermal Energy Conversion (OTEC)
Last Answer : Answer: A