Electrostatic separation of minerals from each other is based on their differences in the following property. (A) Densities (B) Magnetic permeabilities (C) Electrical conductivities (D) Hardness

Electrostatic separation of minerals from each other is based on their differences in the following property.
(A) Densities
(B) Magnetic permeabilities
(C) Electrical conductivities
(D) Hardness
by

1 Answer

Answer :

(C) Electrical conductivities
by

Related questions

Separation of solid particles based on their densities is called (A) Sizing (B) Sorting (C) Clarification (D) Dispersion

Description : Separation of solid particles based on their densities is called (A) Sizing (B) Sorting (C) Clarification (D) Dispersion

Last Answer : (B) Sorting

Electrical conductivities of semi-conductors are of the order of __________ ohm/cm. (A) 10-3 (B) 103 (C) 10-15 (D) 1015

Description : Electrical conductivities of semi-conductors are of the order of __________ ohm/cm. (A) 10-3 (B) 103 (C) 10-15 (D) 1015

Last Answer : OptionA

. In a linear polymer, the monomeric units are linked together to form long straight chains. The cross linked or branched chain polymers compared to linear polymers have higher (A) Densities (B) Melting point (C) Tensile strength (D) Hardness, rigidity & brittleness

Description : . In a linear polymer, the monomeric units are linked together to form long straight chains. The cross linked or branched chain polymers compared to linear polymers have higher (A) Densities (B) Melting point (C) Tensile strength (D) Hardness, rigidity & brittleness

Last Answer : (D) Hardness, rigidity & brittleness

Separation of particles of various sizes, shapes and densities by allowing them to settle in a fluid is called (A) Classification (B) Froth floatation (C) Thickening (D) Clarification

Description : Separation of particles of various sizes, shapes and densities by allowing them to settle in a fluid is called (A) Classification (B) Froth floatation (C) Thickening (D) Clarification

Last Answer : (A) Classification

Pick out the correct statement: (A) Removal of iron from ceramic material is necessitated (by magnetic separation method) so as to avoid discolouration of ceramic products (B) The operating cost of shaking screen is more than that of a vibrating screen (C) Screen capacity does not depend upon the specific gravity of the minerals (D) Asphalt is best crushed using toothed roll crusher

Description : Pick out the correct statement: (A) Removal of iron from ceramic material is necessitated (by magnetic separation method) so as to avoid discolouration of ceramic products (B) The operating cost of ... upon the specific gravity of the minerals (D) Asphalt is best crushed using toothed roll crusher

Last Answer : (A) Removal of iron from ceramic material is necessitated (by magnetic separation method) so as to avoid discolouration of ceramic products

Which of the following minerals is not subjected to magnetic separation method? (A) Rutile (B) Galena (C) Chromite (D) Siderite

Description : Which of the following minerals is not subjected to magnetic separation method? (A) Rutile (B) Galena (C) Chromite (D) Siderite

Last Answer : (B) Galena

Which of the following is not considered a physical property of minerals? A) silicate structure B) streak C) hardness D) luster

Description : Which of the following is not considered a physical property of minerals? A) silicate structure B) streak C) hardness D) luster

Last Answer : silicate structure

Sorting classifiers employing differential settling methods forseparation of particles make use of the differences in their(A) Particle sizes(B) Densities(C) Terminal velocities(D) None of these

Description : Sorting classifiers employing differential settling methods forseparation of particles make use of the differences in their (A) Particle sizes (B) Densities (C) Terminal velocities (D) None of these

Last Answer : (C) Terminal velocities

Capacitance grading of cable implies (a) use of dielectrics of different permeabilities (b) grading according to capacitance of cables per km length (c) cables using single dielectric in different concentrations (d) capacitance required to be introduced at different lengths to counter the effect of inductance (e) none of the above

Description : Capacitance grading of cable implies (a) use of dielectrics of different permeabilities (b) grading according to capacitance of cables per km length (c) cables using single dielectric in different ... introduced at different lengths to counter the effect of inductance (e) none of the above

Last Answer : (a) use of dielectrics of different permeabilities

Which of the following is NOT a physical property of crystalline boron? w) brown color x) diamond hardness y) brittleness z) high electrical resistance

Description : Which of the following is NOT a physical property of crystalline boron? w) brown color x) diamond hardness y) brittleness z) high electrical resistance 

Last Answer : ANSWER: W -- BROWN COLOR (Crystalline boron is transparent.) 

Explain electrostatic separation with a neat sketch.

Description : Explain electrostatic separation with a neat sketch. 

Last Answer : Electrostatic Separator Principle: If one or more of the materials of a granular mixture can acquire a  surface charge on or just before entering an electrostatic field, the particles of that ... repelled by electrode ,attracted by drum, falls straight in collecting bin due to gravity. 

Thermal conductivities of most of the liquids __________ with rise in temperature.(A) Increases (B) Decreases (C) Remains unchanged (D) May increase or decrease; depends on the liquid

Description : Thermal conductivities of most of the liquids __________ with rise in temperature. (A) Increases (B) Decreases (C) Remains unchanged (D) May increase or decrease; depends on the liquid

Last Answer : (B) Decreases

At constant temperature, the thermal conductivities of gases__________ with rise in pressure.(A) Decrease(B) Increase(C) Remain unchanged(D) May increase or decrease; depends on the pressure

Description : At constant temperature, the thermal conductivities of gases__________ with rise in pressure. (A) Decrease (B) Increase (C) Remain unchanged (D) May increase or decrease; depends on the pressure

Last Answer : (A) Decrease

. The inner wall of a furnace is at a temperature of 700°C. The composite wall is made of two substances, 10 and 20 cm thick with thermal conductivities of 0.05 and 0.1 W.m-1.°C-1 respectively. The ambient air is at 30°C and the heat transfer co-efficient between the outer surface of wall and air is 20 W.m-2 .°C-1 . The rate of heat loss from the outer surface in W.m-2 is (A) 165.4 (B) 167.5 (C) 172.5 (D) 175

Description : . The inner wall of a furnace is at a temperature of 700°C. The composite wall is made of two substances, 10 and 20 cm thick with thermal conductivities of 0.05 and 0.1 W.m-1.°C-1 respectively. The ambient air is at 30°C ... from the outer surface in W.m-2 is (A) 165.4 (B) 167.5 (C) 172.5 (D) 175

Last Answer : (A) 165.4

A steam pipe is intended to be insulated with two layers of insulating materials of different thermal conductivities. For minimum heat transfer to take place (A) The better insulation material should be put just next to pipe (i.e., inside) (B) The better insulating material should be put outside (C) Either of the insulating material could be put on either side (D) Steam temperature is considered before deciding as to which insulating material is to be put inside (i.e., just next to the pipe)

Description : A steam pipe is intended to be insulated with two layers of insulating materials of different thermal conductivities. For minimum heat transfer to take place (A) The better insulation material should be put just ... to which insulating material is to be put inside (i.e., just next to the pipe)

Last Answer : (A) The better insulation material should be put just next to pipe (i.e., inside)

Which of the following have the highest thermal conductivities?  a. liquids  b. gases  c. metals  d. solids other than metals

Description : Which of the following have the highest thermal conductivities?  a. liquids  b. gases  c. metals  d. solids other than metals

Last Answer : metals

Mho's scale of hardness, which consists of 10 standard minerals is used for the measurement of __________ hardness. (A) Scratch (B) Indentation (C) Dynamic (D) Rebound

Description : Mho's scale of hardness, which consists of 10 standard minerals is used for the measurement of __________ hardness. (A) Scratch (B) Indentation (C) Dynamic (D) Rebound

Last Answer : (A) Scratch

Which of the following statements holds for the divergence of electric and magnetic flux densities?

Description : Which of the following statements holds for the divergence of electric and magnetic flux densities?  A) Both are zero B) These are zero for static densities but non zero for time varying densities C) It is zero for electric flux density D) It is zero for magnetic flux density

Last Answer : Which of the following statement holds for the divergence of electric and magnetic flux densities ?  (A) Both are zero (B) These are zero for static densities but non zero for time varying densities. (C) It is zero for the electric flux density (D) It is zero for the magnetic flux density

_________ is defined as the geometric mean of the relative rejections and the relative recoveries of two minerals. (A) Separation efficiency (B) Selectivity index (C) Concentration ratio (D) None of these

Description : _________ is defined as the geometric mean of the relative rejections and the relative recoveries of two minerals. (A) Separation efficiency (B) Selectivity index (C) Concentration ratio (D) None of these

Last Answer : (B) Selectivity index

The temperature at which the magnetic property of iron disappears (i.e., it becomes non-magnetic) and its electrical conductivity & specific heat also changes, is called the 'Curie point', which is __________ °C. (A) 768 (B) 908 (C) 1400 (D) 1539

Description : The temperature at which the magnetic property of iron disappears (i.e., it becomes non-magnetic) and its electrical conductivity & specific heat also changes, is called the 'Curie point', which is __________ °C. (A) 768 (B) 908 (C) 1400 (D) 1539

Last Answer : Option A

Why are there a wide range of colours, hardness, crystal forms, luster and density found in minerals ? -SST 10th

Description : Why are there a wide range of colours, hardness, crystal forms, luster and density found in minerals ? -SST 10th

Last Answer : A wide range of colours, hardness, crystal forms, luster, and density is found in minerals because of the high levels of variations in physical and chemical conditions under which a mineral is formed.

Why are there a wide range of colours, hardness, crystal forms, lustre and density found in minerals? -SST 10th

Description : Why are there a wide range of colours, hardness, crystal forms, lustre and density found in minerals? -SST 10th

Last Answer : The ranges found in minerals are due to physical and chemical conditions.

Pick up the correct statement from the following: (A) To an agriculturist, soil is the substance existing on the earth's surface, which grows and develops plants (B) To a geologist, soil is the material in a relatively thin surface zone within which roots occur, and rest of the crust is termed as rock irrespective of hardness (C) To an engineer, soil is the unaggregated and uncemented deposits of minerals and organic particles covering the earth's crust (D) All the above

Description : Pick up the correct statement from the following: (A) To an agriculturist, soil is the substance existing on the earth's surface, which grows and develops plants (B) To a geologist, soil ... and uncemented deposits of minerals and organic particles covering the earth's crust (D) All the above

Last Answer : (D) All the above

A metallic alloy in general as compared to their pure metal components is (A) More corrosion resistant (B) Having higher melting point (C) Having lower hardness, reactivity and fusibility (D) Having lower electrical conductivity

Description : A metallic alloy in general as compared to their pure metal components is (A) More corrosion resistant (B) Having higher melting point (C) Having lower hardness, reactivity and fusibility (D) Having lower electrical conductivity

Last Answer : (A) More corrosion resistant

For time varying currents, the field or waves will be a) Electrostatic b) Magneto static c) Electromagnetic d) Electrical

Description : For time varying currents, the field or waves will be a) Electrostatic b) Magneto static c) Electromagnetic d) Electrical

Last Answer : c) Electromagnetic

Operating principle of cyclone separator is based on the action of __________ dust particles. (A) Diffusion of (B) Centrifugal force on (C) Gravitational force on (D) Electrostatic force on

Description : Operating principle of cyclone separator is based on the action of __________ dust particles. (A) Diffusion of (B) Centrifugal force on (C) Gravitational force on (D) Electrostatic force on

Last Answer : (B) Centrifugal force on

Presence of 0.3 to 0.5% arsenic in copper increases its (A) Ductility (B) Malleability (C) Tenacity & hardness (D) Electrical conductivity

Description : Presence of 0.3 to 0.5% arsenic in copper increases its (A) Ductility (B) Malleability (C) Tenacity & hardness (D) Electrical conductivity

Last Answer : (C) Tenacity & hardness

The most distinguished property of malleable cast iron is its high (A) Ductility (B) Hardness (C) Malleability (D) None of these

Description : The most distinguished property of malleable cast iron is its high (A) Ductility (B) Hardness (C) Malleability (D) None of these

Last Answer : (A) Ductility

_______ property of a material is determined by the Herbert Pendulum device. (A) Hardness (B) Tensile (C) Toughness (D) Compressive

Description : _______ property of a material is determined by the Herbert Pendulum device. (A) Hardness (B) Tensile (C) Toughness (D) Compressive

Last Answer : (A) Hardness

A material is capable of resisting softening at high temperature, because of its property termed as (A) Hot temper (B) Hot hardness (C) Fatigue (D) Creep

Description : A material is capable of resisting softening at high temperature, because of its property termed as (A) Hot temper (B) Hot hardness (C) Fatigue (D) Creep

Last Answer : (B) Hot hardness

On which of the following techniques photo state machine works? Magnetic Image—Making Thermal Image—Making Electrostatic Image—Making Electromagnetic Image Making

Description : On which of the following techniques photo state machine works? Magnetic Image—Making Thermal Image—Making Electrostatic Image—Making Electromagnetic Image Making

Last Answer : (3) Electrostatic Image- Making Explanation: All Electrostatic Copiers work under the premise that a charge of electricity is placed on an Image Drum which has the ability to retain. the electric ... ) is a machine that makes paper copies of documents and other visual images quickly and cheaply.

The weakest of all fundamental forces is – (1) Gravitational force (2) Electrostatic force (3) Magnetic force (4) Nuclear force

Description : The weakest of all fundamental forces is – (1) Gravitational force (2) Electrostatic force (3) Magnetic force (4) Nuclear force

Last Answer : (1) Gravitational force Explanation: In particle physics, fundamental interactions (sometimes called interactive forces or fundamental forces) are the ways that elementary particles interact with one another. ... weak interaction ("weak nuclear force"), and gravitation. All are non-contact forces.

A current carrying conductor is associated with – (1) a magnetic field (2) an electric field (3) an electro-magnetic field (4) an electrostatic field

Description : A current carrying conductor is associated with – (1) a magnetic field (2) an electric field (3) an electro-magnetic field (4) an electrostatic field

Last Answer : (3) an electro-magnetic field Explanation: A current carrying conductor, such as a metal wire, will produce a magnetic field around it because of the motion of charge within the wire itself. This motion produces or sets up a magnetic field around the wire in the form of concentric circles.

A photostat machine works on – (1) electromagnetic image making (2) electrostatic image making (3) magnetic image making (4) thermal image making

Description : A photostat machine works on – (1) electromagnetic image making (2) electrostatic image making (3) magnetic image making (4) thermal image making

Last Answer : (2) electrostatic image making Explanation: A photocopier uses electrostatic charge to produce a copy. The original document is placed onto a sheet of glass. An image of this page is projected ... drum which are lit by the projected image lose their electrostatic charge when they start to conduct.

The polarization of a radio wave: A. Is perpendicular to the electrostatic field of the antenna B. Is the same direction as the electrostatic field of the antenna. C. Is the same direction as the magnetic field of the antenna. D. Is perpendicular to both the electrostatic and magnetic fields of the antenna.

Description : The polarization of a radio wave: A. Is perpendicular to the electrostatic field of the antenna B. Is the same direction as the electrostatic field of the antenna. C. Is the same direction ... field of the antenna. D. Is perpendicular to both the electrostatic and magnetic fields of the antenna.

Last Answer : B. Is the same direction as the electrostatic field of the antenna.

Phenomena in which a charged body attract uncharged body is called A. electrostatic induction B. electric current C. charge movement D. magnetic induction

Description : Phenomena in which a charged body attract uncharged body is called A. electrostatic induction B. electric current C. charge movement D. magnetic induction

Last Answer : electrostatic induction

In what way do magnetic lines of force differ from electrostatic lines of force?

Description : In what way do magnetic lines of force differ from electrostatic lines of force?

Last Answer : Electrostatic lines of force do not form closed loops

Forces in ionic crystalline solids are primarily which of the following? w)covalent x)electrostatic y)Van der Waals z)magnetic

Description : Forces in ionic crystalline solids are primarily which of the following? w)covalent x)electrostatic y)Van der Waals z)magnetic

Last Answer : ANSWER: X -- ELECTROSTATIC

A current carrying conductor is associated with (1) a magnetic field (2) an electric field (3) an electro-magnetic field (4) an electrostatic field

Description : A current carrying conductor is associated with (1) a magnetic field (2) an electric field (3) an electro-magnetic field (4) an electrostatic field

Last Answer : an electro-magnetic field

A photostat machine works on (1) electromagnetic image making (2) electrostatic image making (3) magnetic image making (4) thermal image making

Description : A photostat machine works on (1) electromagnetic image making (2) electrostatic image making (3) magnetic image making (4) thermal image making 

Last Answer : electrostatic image making

The weakest of all fundamental forces is (1) Gravitational force (2) Electrostatic force (3) Magnetic force (4) Nuclear force

Description : The weakest of all fundamental forces is (1) Gravitational force (2) Electrostatic force (3) Magnetic force (4) Nuclear force

Last Answer :  Gravitational force

On which of the following techniques photostate machine works ? (1) Magnetic Image—Making (2) Thermal Image—Making (3) Electrostatic Image—Making (4) Electromagnetic Image— Making

Description : On which of the following techniques photostate machine works ? (1) Magnetic Image—Making (2) Thermal Image—Making (3) Electrostatic Image—Making (4) Electromagnetic Image— Making

Last Answer :  Electrostatic Image—Making

Addition of tungsten to steel imparts (A) Magnetic properties (B) Cutting hardness (C) Corrosion resistance (D) Ductility

Description : Addition of tungsten to steel imparts (A) Magnetic properties (B) Cutting hardness (C) Corrosion resistance (D) Ductility

Last Answer : (B) Cutting hardness

All electrical appliances are connected in parallel to each other between the main line and neutral wire to get a. same current b. same current and potential difference c. different current but same potential difference d. different current and potential differences

Description : All electrical appliances are connected in parallel to each other between the main line and neutral wire to get a. same current b. same current and potential difference c. different current but same potential difference d. different current and potential differences

Last Answer : c. different current but same potential difference

The same volume of all gases is representative of their (A) Specific gravities (B) Densities (C) Gas characteristic constants

Description : The same volume of all gases is representative of their (A) Specific gravities (B) Densities (C) Gas characteristic constants

Last Answer : Option D

Pick out the wrong statement. (A) Critical moisture content is not a property of the material itself (B) A sharp increase in pressure drop gives an indication of the flooding in a distillation column (C) Separation of components is not possible in liquid extraction, if selectivity is unity (D) Dehydration of ethyl alcohol is most economically done by molecular distillation at very high vacuum

Description : Pick out the wrong statement. (A) Critical moisture content is not a property of the material itself (B) A sharp increase in pressure drop gives an indication of the flooding in a ... unity (D) Dehydration of ethyl alcohol is most economically done by molecular distillation at very high vacuum

Last Answer : (D) Dehydration of ethyl alcohol is most economically done by molecular distillation at very high vacuum

Heavy metals got their name because compared to other atoms they have - (1) Higher densities (2) Higher atomic masses (3) Higher atomic numbers (4) Higher atomic radii

Description : Heavy metals got their name because compared to other atoms they have - (1) Higher densities (2) Higher atomic masses (3) Higher atomic numbers (4) Higher atomic radii

Last Answer : (2) Higher atomic masses Explanation: Arsenic, beryllium, cadmium, chromium, lead, manganese, mercury, nickel, and selenium are some of the metals called 'heavy' because of their high relative atomic ... and can cause damage or death in animals, humans, and plants even at very low concentrations.

Heavy metals got their name because compared to other atoms they have (1) Higher densities (2) Higher atomic masses (3) Higher atomic numbers (4) Higher atomic radii

Description : Heavy metals got their name because compared to other atoms they have (1) Higher densities (2) Higher atomic masses (3) Higher atomic numbers (4) Higher atomic radii

Last Answer : Higher atomic masses

Pick out the wrong statement: (A) Magnetic separation method can be employed to treat both dry & wet ores (B) Reduction ratio in crushing operation is defined as the ratio of minimum feed size to the maximum product size (C) Gyratory crusher is used for coarse crushing (D) Screens are of stationary, moving and vibratory types

Description : Pick out the wrong statement: (A) Magnetic separation method can be employed to treat both dry & wet ores (B) Reduction ratio in crushing operation is defined as the ratio of minimum feed ... ) Gyratory crusher is used for coarse crushing (D) Screens are of stationary, moving and vibratory types

Last Answer : (B) Reduction ratio in crushing operation is defined as the ratio of minimum feed size to the maximum product size

Solid particles separation based on the difference in their flow velocities through fluids is termed as the (A) Clarification (B) Classification (C) Elutriation (D) Sedimentation

Description : Solid particles separation based on the difference in their flow velocities through fluids is termed as the (A) Clarification (B) Classification (C) Elutriation (D) Sedimentation

Last Answer : (B) Classification