Phosphorus is kept in water because – (1) its ignition temperature is very high (2) its ignition temperature is very low (3) its critical temperature is high (4) its critical temperature is low

Phosphorus is kept in water because – (1) its ignition temperature is very high (2) its ignition temperature is very low (3) its critical temperature is high (4) its critical temperature is low
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(2) its ignition temperature is very low Explanation: The allotropic form of Phosphorus (white phosphorus) is less stable and therefore highly reactive because of angular strain in P4 molecule where the angles are only 600.
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Phosphorus is kept in water because (1) its ignition temperature is very high (2) its ignition temperature is very low (3) its critical temperature is high (4) its critical temperature is low

Description : Phosphorus is kept in water because (1) its ignition temperature is very high (2) its ignition temperature is very low (3) its critical temperature is high (4) its critical temperature is low

Last Answer : its ignition temperature is very low

A coal containing high amount of volatile matter will have (A) Low ignition temperature (B) Very little ash content (C) High fusion point of its ash (D) Low adiabatic flame temperature

Description : A coal containing high amount of volatile matter will have (A) Low ignition temperature (B) Very little ash content (C) High fusion point of its ash (D) Low adiabatic flame temperature

Last Answer : (A) Low ignition temperature

Presence of predominantly large quantity of aromatics (polynuclear) is not desirable in aviation fuel, because it has (A) High pour point and low smoke point (B) Low viscosity index (C) High self-ignition temperature (D) All (A), (B) and (C)

Description : Presence of predominantly large quantity of aromatics (polynuclear) is not desirable in aviation fuel, because it has (A) High pour point and low smoke point (B) Low viscosity index (C) High self-ignition temperature (D) All (A), (B) and (C)

Last Answer : (B) Low viscosity index

Though kinetics of ammonia synthesis dictates the use of low temperature for high equilibrium conversion, yet it is kept moderately high (550°C), because at low temperature (A) Rate of reaction is very low (B) Very high pressure is required resulting in costly pressure vessel (C) Space velocity of gas is very low resulting in decreased conversion (D) None of these

Description : Though kinetics of ammonia synthesis dictates the use of low temperature for high equilibrium conversion, yet it is kept moderately high (550°C), because at low temperature (A) Rate of reaction is very low ... (C) Space velocity of gas is very low resulting in decreased conversion (D) None of these

Last Answer : (A) Rate of reaction is very low

High aniline point of a petrofuel (say diesel) indicates that (A) It is highly aromatic in nature (B) It is highly paraffinic in nature (C) It has a very low diesel index (D) Its ignition quality is very poor

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Last Answer : (B) It is highly paraffinic in nature

White phosphorus is generally kept under – (1) Alcohol (2) Water (3) Glycerine (4) Kerosene oil

Description : White phosphorus is generally kept under – (1) Alcohol (2) Water (3) Glycerine (4) Kerosene oil

Last Answer : (2) Water Explanation: White phosphorous is kept under water because it reacts with oxygen but not water. Besides, it is insoluble in water. It presents a significant fire hazard due to its extreme reactivity with atmospheric oxygen.

White phosphorus is always kept under (1) benzene (2) kerosene (3) ether (4) water

Description : White phosphorus is always kept under (1) benzene (2) kerosene (3) ether (4) water

Last Answer : (4) water Explanation: White phosphorus is a material made from a common allotrope of the chemical element phosphorus that is used in smoke, tracer, illumination and incendiary munitions. Other common names include WP ... on fire, and cause serious burns or death and that is why it is kept in water.

White phosphorus is generally kept under (1) Alcohol (2) Water (3) Glycerine (4) Kerosene oil

Description : White phosphorus is generally kept under (1) Alcohol (2) Water (3) Glycerine (4) Kerosene oil

Last Answer : Water

White phosphorus is always kept under (1) benzene (2) kerosene (3) ether (4) water

Description : White phosphorus is always kept under (1) benzene (2) kerosene (3) ether (4) water

Last Answer : water

The probability of knocking in diesel engines is increased by a. High self-ignition temperature. b. Low volatility. c. High viscosity. d. all of the above

Description : The probability of knocking in diesel engines is increased by a. High self-ignition temperature. b. Low volatility. c. High viscosity. d. all of the above

Last Answer : ANSWER d. all of the above

The probability of knocking in diesel engines is increased by a. High self-ignition temperature. b. Low volatility. c. High viscosity. d. All of the above

Description : The probability of knocking in diesel engines is increased by a. High self-ignition temperature. b. Low volatility. c. High viscosity. d. All of the above

Last Answer : ANSWER d. all of the above

In high temperature carbonisation (as compared to low temperature carbonisation) of coal, the (A) Gas yield is less (B) Tar yield is more (C) Ignition temperature of coke produced is less (D) Aromatic content of tar produced is more

Description : In high temperature carbonisation (as compared to low temperature carbonisation) of coal, the (A) Gas yield is less (B) Tar yield is more (C) Ignition temperature of coke produced is less (D) Aromatic content of tar produced is more

Last Answer : (D) Aromatic content of tar produced is more

Coke used for the production of calcium carbide should have (A) Low ash content (B) Low ignition temperature (C) High electrical resistivity (D) All (A), (B) and (C)

Description : Coke used for the production of calcium carbide should have (A) Low ash content (B) Low ignition temperature (C) High electrical resistivity (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

Choose the correct statement about inflammable substance from the following. They have a) low ignition temperature and cannot catch fire easily. b) high ignition temperature and can catch fire easily . c) low ignition temperature and can catch fire easily d) high ignition temperature and cannot catch fire easily

Description : Choose the correct statement about inflammable substance from the following. They have a) low ignition temperature and cannot catch fire easily. b) high ignition temperature and can catch fire easily ... temperature and can catch fire easily d) high ignition temperature and cannot catch fire easily

Last Answer : c) low ignition temperature and can catch fire easily

iesel engine has less reserve torque then spark ignition because ∙ Torque-speed curve is governed by volumetric efficiency of fuel pump and engine cylinder ∙ Torque is a function of thermal efficiency ∙ Diesel engine has generally low speed engine ∙ None of the above

Description : iesel engine has less reserve torque then spark ignition because ∙ Torque-speed curve is governed by volumetric efficiency of fuel pump and engine cylinder ∙ Torque is a function of thermal efficiency ∙ Diesel engine has generally low speed engine ∙ None of the above

Last Answer : ∙ Torque is a function of thermal efficiency

White phosphorus is always kept under

Description : White phosphorus is always kept under

Last Answer : Water

A diesel engine is usually more efficient than a spark ignition engine because a. Diesel being a heavier hydrocarbon, release more heat per kg than gasoline b. The air standard efficiency of diesel cycle is higher than the Otto cycle, at a fixed compression ratio c. The compression ratio of a diesel engine is higher than that of an Spark ignition engine d.Self ignition temperature of diesel is higher than that of gasoline.

Description : A diesel engine is usually more efficient than a spark ignition engine because a. Diesel being a heavier hydrocarbon, release more heat per kg than gasoline b. The air standard efficiency of diesel ... an Spark ignition engine d.Self ignition temperature of diesel is higher than that of gasoline.

Last Answer : ANSWER c. The compression ratio of a diesel engine is higher than that of an S.I engine

Ignition temperature decreases progressively from anthracite to lignite, because (A) Volatile matter content increases (B) Carbon content decreases (C) Moisture content increases (D) Ash content increases

Description : Ignition temperature decreases progressively from anthracite to lignite, because (A) Volatile matter content increases (B) Carbon content decreases (C) Moisture content increases (D) Ash content increases

Last Answer : (A) Volatile matter content increases

My soil is poor, very low in Nitrogen, phosphorus and potash. How do I correct it?

Description : My soil is poor, very low in Nitrogen, phosphorus and potash. How do I correct it?

Last Answer : Need Answer

When a vehicle passes, TV reception gets distorted. This is because – (1) metal reflects radiowaves (2) spark plug creates electromagnetic disturbances (3) vehicle pollution affects the performance of the TV components (4) modern vehicles use electro ignition system

Description : When a vehicle passes, TV reception gets distorted. This is because – (1) metal reflects radiowaves (2) spark plug creates electromagnetic disturbances (3) vehicle pollution affects the performance of the TV components (4) modern vehicles use electro ignition system

Last Answer : (2) spark plug creates electromagnetic disturbances Explanation: This is caused due to the interference caused by the electromagnetic waves generated by a passing vehicle. These waves were within the same ... in which two waves superimpose to form a resultant wave of greater or lower amplitude.

High aniline point of diesel indicates that, it (A) Is highly aromatic (B) Has a large ignition delay (C) Is highly paraffinic (D) Has a low diesel index

Description : High aniline point of diesel indicates that, it (A) Is highly aromatic (B) Has a large ignition delay (C) Is highly paraffinic (D) Has a low diesel index

Last Answer : (C) Is highly paraffinic

For long flame and easy ignition, the coal used should have (A) High volatile matter (B) Low ash (C) High calorific value (D) High ash

Description : For long flame and easy ignition, the coal used should have (A) High volatile matter (B) Low ash (C) High calorific value (D) High ash

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Define calorific value & ignition temperature

Description : Define calorific value & ignition temperature 

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The tendency of knocking in CI engine reduces by (a) High self ignition temperature of fuel (b) Decrease in jacket water temperature (c) Injection of fuel just before TDC (d) Decrease in injection pressure

Description : The tendency of knocking in CI engine reduces by (a) High self ignition temperature of fuel (b) Decrease in jacket water temperature (c) Injection of fuel just before TDC (d) Decrease in injection pressure

Last Answer : Ans :c

Alcohols alone cannot be used in CI engines as a) their self ignition temperature is high b) latent heat of vaporization is high c) all of the mentioned d) none of the mentioned

Description : Alcohols alone cannot be used in CI engines as a) their self ignition temperature is high b) latent heat of vaporization is high c) all of the mentioned d) none of the mentioned

Last Answer : Answer: c Explanation: None.

Which one of the following is used for dating very old objects of archaeological importance? (1) Phosphorus-31 (2) Tritium (3) Radium (4) Carbon-14

Description : Which one of the following is used for dating very old objects of archaeological importance? (1) Phosphorus-31 (2) Tritium (3) Radium (4) Carbon-14

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Which one of the following is used for dating very old objects of archaeological importance? (1) Phosphorus-31 (2) Tritium (3) Radium (4) Carbon-14

Description : Which one of the following is used for dating very old objects of archaeological importance? (1) Phosphorus-31 (2) Tritium (3) Radium (4) Carbon-14

Last Answer : Carbon-14

Ultra-super critical boiler uses steam with very high temperature up to …… a) 980° b) 620° c) 550° d) 720°

Description : Ultra-super critical boiler uses steam with very high temperature up to …… a) 980° b) 620° c) 550° d) 720°

Last Answer : b) 620°

For efficient working of a control meter, its throat length is approximately kept (A) Equal to the critical depth (B) Twice the critical depth (C) Three times the critical depth (D) Four times the critical depth

Description : For efficient working of a control meter, its throat length is approximately kept (A) Equal to the critical depth (B) Twice the critical depth (C) Three times the critical depth (D) Four times the critical depth

Last Answer : Answer: Option C

Which of the following engine can work on very lean mixture a. Spark ignition engine b. compression ignition engine c. two stroke engine d. Four stroke engine

Description : Which of the following engine can work on very lean mixture a. Spark ignition engine b. compression ignition engine c. two stroke engine d. Four stroke engine

Last Answer : ANSWER b. compression ignition engine

Why is it a poor practice to use a high wattage soldering iron when soldering or desoldering components on a printed circuit board? A. The circuit board will blister and warp. B. The foil wire bonded to the board may come loosened from the board. C. The circuit board has a low melting temperature. D. The solder is kept to a dull heat dissipating finish.

Description : Why is it a poor practice to use a high wattage soldering iron when soldering or desoldering components on a printed circuit board? A. The circuit board will blister and warp. B. The foil wire bonded ... board has a low melting temperature. D. The solder is kept to a dull heat dissipating finish.

Last Answer : Answer: B

Which of the following statements describes the significance of ambient temperature in relation to the service life of electronic components? A. Ambient temperature should be as high as possible to drive off moisture. B. Increased ambient temperature decreases the service life of electronic components. C. Ambient temperature is not significant as long as the relative humidity is kept low. D. A reduced ambient temperature causes a corresponding reduced service life.

Description : Which of the following statements describes the significance of ambient temperature in relation to the service life of electronic components? A. Ambient temperature should be as high as possible to drive ... is kept low. D. A reduced ambient temperature causes a corresponding reduced service life.

Last Answer : Answer: B

Pick out the wrong statement. Generally for physical adsorption, a gas of (A) Higher molecular weight is adsorbed in preference to a gas of low molecular weight (B) High critical temperature is adsorbed in preference to a gas of low critical temperature (C) Low volatility is adsorbed in preference to a gas of high volatility (D) None of these

Description : Pick out the wrong statement. Generally for physical adsorption, a gas of (A) Higher molecular weight is adsorbed in preference to a gas of low molecular weight (B) High critical temperature ... volatility is adsorbed in preference to a gas of high volatility (D) None of these

Last Answer : (D) None of these

In a battery ignition system, the intensity of spark is A. minimum at low engine speed B. minimum at low engine speed and increases with engine speed C. maximum al low engine speed and decreases with engine speed D. maximum at low engine speed

Description : In a battery ignition system, the intensity of spark is A. minimum at low engine speed B. minimum at low engine speed and increases with engine speed C. maximum al low engine speed and decreases with engine speed D. maximum at low engine speed

Last Answer : ANSWER : C

Which of the following statement is incorrect?  A. The liquid fuels consist of hydrocarbons.  B. The liquid fuels have higher calorific value than solid fuels.  C. The solid fuels have higher calorific value than liquid fuels.  D. A good fuel should have low ignition point.

Description : Which of the following statement is incorrect?  A. The liquid fuels consist of hydrocarbons.  B. The liquid fuels have higher calorific value than solid fuels.  C. The solid fuels have higher calorific value than liquid fuels.  D. A good fuel should have low ignition point.

Last Answer : Answer: C

The temperature of boiling water in a steam engine may be high because - (1) there are dissolved substances in water (2) there is low pressure inside the boiler (3) there is high pressure inside the boiler (4) the lire is at very high temperature

Description : The temperature of boiling water in a steam engine may be high because - (1) there are dissolved substances in water (2) there is low pressure inside the boiler (3) there is high pressure inside the boiler (4) the lire is at very high temperature

Last Answer : (3) there is high pressure inside the boiler Explanation: In the boiler of a steam engine, there is a firebox where coal is shoveled into. The coal is kept burning at a very high temperature, and ... reservoir; the steam is then controlled by a slide valve to move into a cylinder to push the piston.

The temperature of boiling water in a steam engine may be high because : (1) there are dissolved substances in water (2) there is low pressure inside the boiler (3) there is high pressure inside the boiler (4) the fire is at very high temperature

Description : The temperature of boiling water in a steam engine may be high because : (1) there are dissolved substances in water (2) there is low pressure inside the boiler (3) there is high pressure inside the boiler (4) the fire is at very high temperature

Last Answer :  there is high pressure inside the boiler

It is not preferable to use superheated steam in evaporators, because of its very (A) High temperature (B) High pressure (C) Low film co-efficient (D) None of these

Description : It is not preferable to use superheated steam in evaporators, because of its very (A) High temperature (B) High pressure (C) Low film co-efficient (D) None of these

Last Answer : (C) Low film co-efficient

Is phosphorus high or low melting point?

Description : Is phosphorus high or low melting point?

Last Answer : Melting point: 111.57 degrees Fahrenheit (44.15 degreesCelsius)

What is the only nonmetal element that is a liquid room temperature? w) phosphorus x) bromine y) iodine z) arsenic

Description : What is the only nonmetal element that is a liquid room temperature? w) phosphorus x) bromine y) iodine z) arsenic

Last Answer : ANSWER: X -- BROMINE

Performance number of a liquid fuel is related to its (A) Wax content (B) Spontaneous ignition temperature (C) Knocking tendency (D) Sulphur content

Description : Performance number of a liquid fuel is related to its (A) Wax content (B) Spontaneous ignition temperature (C) Knocking tendency (D) Sulphur content

Last Answer : (B) Spontaneous ignition temperature

Octane number of gasoline is a measure of its (A) Resistance to knock (B) Ignition delay (C) Ignition temperature (D) Smoke point

Description : Octane number of gasoline is a measure of its (A) Resistance to knock (B) Ignition delay (C) Ignition temperature (D) Smoke point

Last Answer : (A) Resistance to knock

When a vehicle passes, TV reception gets distorted. This is because – (1) metal reflects radiowaves (2) spark plug creates electromagnetic disturbances (3) vehicle pollution affects the performance of the TV components (4) modern vehicles use electro ignition system

Description : When a vehicle passes, TV reception gets distorted. This is because – (1) metal reflects radiowaves (2) spark plug creates electromagnetic disturbances (3) vehicle pollution affects the performance of the TV components (4) modern vehicles use electro ignition system

Last Answer : (2) spark plug creates electromagnetic disturbances Explanation: This is caused due to the interference caused by the electromagnetic waves generated by a passing vehicle. These waves were within the same ... in which two waves superimpose to form a resultant wave of greater or lower amplitude.

You and Hector are in the car. You are in the passenger seat while Hector is driving. Hector is very good at driving. He closes his eyes to scare you as he is driving.You look at him and see his eyes closed. Your heart starts pounding because there is something in the road and Hector has to swerve out of the way, but with his eyes closed he can't see it, yet he still swerved out of the way and kept driving perfectly. Along with his eyes being closed the whole time, you were also silent the whole time. How is that possible that he knew something was in the way with his eyes closed? -Riddles

Description : You and Hector are in the car. You are in the passenger seat while Hector is driving. Hector is very good at driving. He closes his eyes to scare you as he is driving.You look at him and see ... whole time. How is that possible that he knew something was in the way with his eyes closed? -Riddles

Last Answer : Since you are in the passenger seat, when you look at Hector all you see is the right side of his face, only his right eye. He had his right eye closed and his left eye opened. You just could't see it.

When hot liquid is poured into a thick glass tumbler, it cracks because glass – (1) is a bad conductor of heat so only inner surface expands (2) has high temperature coefficient of expansion (3) has a very low specific heat (4) has low temperature coefficient of expansion

Description : When hot liquid is poured into a thick glass tumbler, it cracks because glass – (1) is a bad conductor of heat so only inner surface expands (2) has high temperature coefficient of expansion (3) has a very low specific heat (4) has low temperature coefficient of expansion

Last Answer : (1) is a bad conductor of heat so only inner surface expands Explanation: When hot liquid is poured into a thick glass tumbler, it cracks because glass is a bad conductor of heat so only inner surface expands.

When hot liquid is poured into a thick glass tumbler, it cracks because glass : (1) is a bad conductor of heat so only inner surface expands (2) has high temperature coefficient of expansion (3) has a very low specific heat (4) has low temperature coefficient of expansion

Description : When hot liquid is poured into a thick glass tumbler, it cracks because glass : (1) is a bad conductor of heat so only inner surface expands (2) has high temperature coefficient of expansion (3) has a very low specific heat (4) has low temperature coefficient of expansion

Last Answer :  is a bad conductor of heat so only inner surface expands 

Ignition quality of petrol is expressed by a. Octane number b. cetane number c. calorific value d. self-ignition temperature

Description : Ignition quality of petrol is expressed by a. Octane number b. cetane number c. calorific value d. self-ignition temperature

Last Answer : ANSWER a. Octane number

The self-ignition temperature of diesel oil compared to petrol is a. higher b. lower c. same d. depends on the quality of fuel

Description : The self-ignition temperature of diesel oil compared to petrol is a. higher b. lower c. same d. depends on the quality of fuel

Last Answer : ANSWER a. higher

Self-ignition temperature of petrol is of the order of a. 150 C b. 240 C c. 370 C d. more than 500 C

Description : Self-ignition temperature of petrol is of the order of a. 150 C b. 240 C c. 370 C d. more than 500 C

Last Answer : ANSWER d. more than 500 C

The self-ignition temperature of diesel as compared to petrol is a. higher b. lower c. same d. varies

Description : The self-ignition temperature of diesel as compared to petrol is a. higher b. lower c. same d. varies

Last Answer : ANSWER a. higher