Description : Which of the following is a good conductor of heat but a bad conductor of electricity? (1) Celluloid (2) Rubber (3) Asbestos (4) Mica
Last Answer : (4) Mica Explanation: Good conductors of heat are good conductors of electricity. Mica is an exception which although being a good conductor of heat and a bad conductor of electricity. It is commonly ... to assist in the transfer of the generated heat to the heat sink or chassis for dissipation.
Description : Which of the following is a good conductor of heat but a bad conductor of electricity ? (1) Celluloid (2) Rubber (3) Asbestos (4) Mica
Last Answer : Mica
Description : Metals are good conductors of electricity because - (1) they contain free electrons (2) the atoms are lightly packed (3) they have high melting point (4) All of the above
Last Answer : (1) they contain free electrons Explanation: Copper is used for electrical wiring because it is a good conductor of electricity. Metal particles are held together by strong metallic bonds, which is why they have high melting and boiling points.
Description : Metals are good conductors of electricity because – (1) they contain free electrons (2) the atoms are lightly packed (3) they have high melting point (4) All of the above
Description : Which of the following is a good conductor of heat but bad conductor of electricity? (1) mica (2) asbestos (3) celluloid (4) paraffin wax
Last Answer : (1) mica Explanation: Mica is a good conductor of heat but bad conductor of electricity.
Description : Which of the following is a good conductor of heat but bad conductor of electricity ? (1) mica (2) asbestos (3) celluloid (4) paraffin wax
Last Answer : mica
Description : Which property of metals make them good conductors of electricity?
Last Answer : Their mobile electrons
Description : Metals are good conductors of electricity because (a) The contain free electrons (b) The atoms are lightly packed (c) They have high melting point (d) All of the above
Last Answer : Ans:(b)
Description : Generally Non-metals are not conductors of electricity. Which of the given is a good conductor of electricity? a) Diamond b) Graphite c) Sulphur d) Fullerene
Last Answer : b) Graphite
Description : Metals are good conductors of electricity because they have: (a) Large number of bounded electrons (b) Small number of electrons (c) Large number of free electrons (d) Small number of free electrons
Last Answer : (c) Large number of free electrons
Description : Which of the following statement is correct: (a) Similar charges attract each other (b) Similar charges attract and repel each other (c) Similar charges repel each other (d) Similar charges neither attract nor repel 9. Metals are good conductors of electricity because they have:
Last Answer : (c) Similar charges repel each other
Description : Consider the following statements: 1. Mica is good conductor of heat. 2. Mica is a bad conductor of heat. 3. Mica is a good conductor of electricity. 4. Mica is a bad conductor of electricity. Which of the above statements is/are correct? (a) 1 only (b) 1 and 4 (c) 1 and 3 (d) 2 and 4
Description : Mica is a bad conductor of electricity and a good conductor of?
Last Answer : Heat
Description : What does the minerals talcmuscovite mica quartz and olivine?
Last Answer : Feel Free to Answer
Description : What is mineral crystals of quartz biotite mica and amphibole are produced primarily by?
Last Answer : Cooling and soildification of magma.
Description : Which one of the following statements is NOT correct? [IAS 2003] (a) Black cotton soil of north-west India was formed by the weathering of basaltic lava rocks (b) Sedimentary rocks are distinguished ... feldspar and mica in it (d) A metamorphic rock is softer and less compact than its original type
Last Answer : Ans: (d)
Description : Feldspar, Quartz and Mica are
Last Answer : Ans. Primary minerals
Description : Which of the following is a metallic ore? (1) Mica (2) Quartz (3) Feldspar (4) Galena
Last Answer : (4) Galena Explanation: Galena is the most abundant lead mineral. It is a metallic, lead-gray mineral with cubic cleavage and a distinctly high density. It belongs to the octahedral sulfide group of minerals with metal ions in octahedral positions.
Description : Which of the following substance is highly plastic? (1) Quartz (2) Mica (3) Granite (4) Clay
Last Answer : (4) Clay Explanation: Clays exhibit plasticity when mixed with water in certain proportions. When dry, clay becomes firm and when fired in a kiln, permanent physical and chemical changes ... with different minerals and firing conditions, are used to produce earthenware, stoneware, and porcelain.
Description : Which of the listed groups of electrical insulation materials is best suited for the highest operating temperatures? A. impregnated cotton and silk B. unimpregnated paper and cotton C. pure glass and quartz D. mica and porcelain with bonding agents
Last Answer : Answer: C
Description : Glass is made of the mixture of-------? A. Quartz and Mica B. Sand and Salt C. Sand and Silicates (Answer) D. None of these
Last Answer : C. Sand and Silicates (Answer)
Description : Based on the following rocks and minerals, select the correct statement, quartz, shale, basalt, granite, marble, gypsum, mica (A) Basalt and marble are the only metamorphic rocks (B) There is no sedimentary rock (C) Granite is the only igneous rock (D) Quartz and mica are minerals
Last Answer : Answer: Option D
Description : Which of the following is a rock? (A) Quartz (B) Mica (C) Gypsum (D) None of these
Last Answer : Answer: Option C
Description : The predominant constituent which is responsible for strength in granite is (A) Quartz (B) Felspar (C) Mica (D) None of the above
Last Answer : Answer: Option A
Description : Of the following types of material, which is the one that is heterogeneous? Is it: w) quartz x) feldspar y) granite z) mica
Last Answer : ANSWER: Y -- GRANITE
Description : Which of the following is a metallic ore ? (1) Mica (2) Quartz (3) Feldspar (4) Galena
Last Answer : Galena
Description : Which of the following substance is highly plastic ? (1) Quartz (2) Mica (3) Granite (4) Clay
Last Answer : Clay
Description : Ceramic materials (A) Are exemplified by clay and mica (B) Are poor electrical conductors due to lack of free electrons (C) Never exhibit polymorphism (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : Plastics are (A) Good conductors of heat. (B) Good conductors of electricity. (C) Bad conductors of electricity. (D) High density.
Last Answer : (C) Bad conductors of electricity.
Description : On a cold day when the room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C, because - (1) metals ... metals (3) metals are good conductors of heat (4) plastics have a higher thermal conductivity than metals
Last Answer : (3) metals are good conductors of heat Explanation: On a chilly day, the room temperature is lower than our body temperature. Since metals have a higher coefficient of thermal conductivity than plastic, they ... from our fingers will flow to the metal cap much more quickly than to the plastic body.
Description : On a cold day when the room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C, because : (1) metals ... metals (3) metals are good conductors of heat (4) plastics have a higher thermal conductivity than metals
Last Answer : metals are good conductors of heat
Description : Which of the following is false? (1) Most carbon compounds are poor conductors of electricity. (2) The force of attraction between carbon molecules is not very strong. (3) The atomic number of carbon is 6. (4) The earth’s crust has about 2% carbon in the form of minerals.
Last Answer : (4) The earth’s crust has about 2% carbon in the form of minerals.
Description : Why are covalent compounds poor conductors of electricity? (1) Due to the presence of charged particles. (2) Due to the absence of charged particles. (3) Due to the presence of a triple bond. (4) None of the above
Last Answer : (2) Due to the absence of charged particles. Explanation: In a covalent compound, electrons are shared between atoms. This leaves no free electrons and hence there and no charged particles. This leads to covalent compounds being poor conductors of electricity.
Description : Super conductors are substances that – (1) offer minimum resistance to flow of electric current (2) conduct electricity at low temperature (3) conduct electricity at high temperature (4) offer high resistance to the flow of electric current
Last Answer : (1) offer minimum resistance to flow of electric current Explanation: A superconductor is a material that can conduct electricity or transport electrons from one atom to another with no ... is released from the material when it reaches the temperature at which it becomes superconductive.
Description : Super conductors are substances that (1) offer minimum resistance to flow of electric current (2) conduct electricity at low temperature (3) conduct electricity at high temperature (4) offer high resistance to the flow of electric current
Last Answer : offer minimum resistance to flow of electric current
Description : Which of the following comprises of hydrocarbons? (A) Mica flakes (B) Glass (C) Rubber (D) None of these
Last Answer : (C) Rubber
Description : Which of the following is not a dielectric material? (A) Cotton, silk and paper (B) Asbestos, glass, porcelain and mica (C) Rubber and polymeric resins (D) All refractory materials
Last Answer : Option C
Description : Cables for 220 kV lines are invariably (a) mica insulated (b) paper insulated (c) compressed oil or compressed gas insulated (d) rubber insulated (e) none of the above
Last Answer : (c) compressed oil or compressed gas insulated
Description : Give the properties and application of following materials :i) mica ii) rubber
Last Answer : i) Mica: Properties of Mica: 1. It has very high resistance 2. It is heat resistant, moisture resistant, it has good elasticity and is fire proof 3. It retains its electrical and mechanical ... Applications of Rubber: 1. It is extensively used as insulation on wires, cables etc.
Description : Which of the following is a conductor of electricity? (1) Rubber (2) Pure water (3) Salt water (4) Benzene
Last Answer : (3) Salt water Explanation: Pure water is actually an extremely poor conductor, but saturated salt water is a good conductor. The saltier the water, the better the conductance. The reason it ... charged Chlorine CF. When current is applied, it is easily conducted by the highly charged ions.
Description : Which of the following is a conductor of electricity ? (1) Rubber (2) Pure water (3) Salt water (4) Benzene
Last Answer : Salt water
Description : Superconductors are those elements – (1) Whose conductivity is intermediate between metals and insulators (2) Whose resistance falls almost to zero at very low temperature (3) Which conduct electricity only at super-high temperature (4) Which conduct electricity only, at super-high temperatures
Last Answer : (2) Whose resistance falls almost to zero at very low temperature Explanation: Superconductivity is a phenomenon of exactly zero electrical resistance and expulsion of magnetic fields occurring in ... lines from the interior of the superconductor as it transitions into the superconducting state.
Description : Which one of the following non-metals is not a poor conductor of electricity? (1) Sulphur (2) Selenium (3) Bromine (4) Phosphorus
Last Answer : (2) Selenium Explanation: Selenium is a non-metallic element; it is not a very good conductor of heat and electricity.
Description : Superconductors are those elements (1) Whose conductivity is intermediate between metals and insulators (2) Whose resistance falls almost to zero at very low temperatures (3) which turn into insulators at very low temperatures (4) which conduct electricity only at super-high temperatures
Last Answer : Whose resistance falls almost to zero at very low temperatures
Description : Line losses in a distribution circuit are kept to a minimum by __________. A. adding rubber insulation conductors to the circuit B. using higher current and lower voltage C. increasing the number of thermal relays in the circuit D. using higher voltage and lower current
Last Answer : Answer: D
Description : Which of the following are conductors? a) Ceramics b) Plastics c) Mercury d) Rubber
Last Answer : c) Mercury
Description : What property of metals makes them good conductors?
Last Answer : What is the answer ?
Description : (a) If the radius of the Br ion is 0.182 nm, how large a cation can fit in each of the tetrahedral hole. (b) AgI crystallizes in a cubic closed packed ZnS structure. What fraction of tetrahedral site ... Ag ion ? (c) At what temp. range, most of the metals becomes super conductors ?
Last Answer : (a) For a tetrahedron the limiting ratio is 0.225 – 0.414 For largest cation highest value 0.414 would be considered. r + / r– = 0.414 r + = 0.414 × 0.182 = 0.075 nm. (b) In FCC there are 8 tetrahedral voids. Out of this ½ is occupied by Ag cation. (c) 2 k – 5 k.
Description : How do electrolytic conductors conduct electricity ?
Last Answer : Compounds that conduct electricity in solution or in molten state are called electrolytic conductors. These compounds can conduct electricity in molten state and in aqueous solution as they are ... the positive and negative ions receive and reject electrons, respectively, so that electricity flows.
Description : Pick out the correct statement. (A) Plastics are good conductors of heat and electricity (B) All the polymers are highly crystalline in nature (C) Polymers can be vaporised by heating to ... D) The liquid polymer becomes greasy, then waxy and finally solid on increasing the degree of polymerisation
Last Answer : (D) The liquid polymer becomes greasy, then waxy and finally solid on increasing the degree of polymerisation