In a barometer, mercury is preferred over water because (a) mercury is a good conductor of heat (b) mercury is shining and therefore its level can be read easily (c) mercury is available in pure form (d) mercury has high density and low vapour pressure

In a barometer, mercury is preferred over water because (a) mercury is a good conductor of heat (b) mercury is shining and therefore its level can be read easily (c) mercury is available in pure form (d) mercury has high density and low vapour pressure
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In cold countries alcohol is preferred to mercury as a thermometric liquid because (a) alcohol is a better conductor of heat (b) alcohol can be coloured and its level seen easily (c) alcohol has a lower freezing point than mercury (d) alcohol is cheaper than mercury

Description : In cold countries alcohol is preferred to mercury as a thermometric liquid because (a) alcohol is a better conductor of heat (b) alcohol can be coloured and its level seen easily (c) alcohol has a lower freezing point than mercury (d) alcohol is cheaper than mercury

Last Answer : Ans:(c)

Mercury is often used in barometer because (A) It is the best liquid (B) The height of barometer will be less (C) Its vapour pressure is so low that it may be neglected (D) Both (B) and (C)

Description : Mercury is often used in barometer because (A) It is the best liquid (B) The height of barometer will be less (C) Its vapour pressure is so low that it may be neglected (D) Both (B) and (C)

Last Answer : Answer: Option D

A reasonably general expression for vapour-liquid phase equilibrium at low to moderate pressure is φi yi P = Yi xifi° where, Φ is a vapor fugacity component, Yiis the liquid activity co-efficient and fi° is the fugacity of the pure component i. the Ki value (Yi = Ki xi) is therefore, in general a function of (A) Temperature only (B) Temperature and pressure only (C) Temperature, pressure and liquid composition xi only (D) Temperature, pressure, liquid composition xi and vapour composition yi

Description : A reasonably general expression for vapour-liquid phase equilibrium at low to moderate pressure is φi yi P = Yi xifi° where, Φ is a vapor fugacity component, Yiis the liquid activity co- ... and liquid composition xi only (D) Temperature, pressure, liquid composition xi and vapour composition yi

Last Answer : (C) Temperature, pressure and liquid composition xi only

A child is a back -bencher and is unable to watch the black-board clearly, therefore he stands, see and sit repeatedly. It disturbs the nearby classmates, what inference will you draw with reference to the student's difficulty? Options: A) The child has poor eye-sight B) The child may has defective eyes C) The black-board may has shining effect of light D) None of the above

Description : A child is a back -bencher and is unable to watch the black-board clearly, therefore he stands, see and sit repeatedly. It disturbs the nearby classmates, what inference will you draw with reference to the ... defective eyes C) The black-board may has shining effect of light D) None of the above

Last Answer : A) The child has poor eye-sight 

Rising level of mercury in Barometer in- dicates?

Description : Rising level of mercury in Barometer in- dicates?

Last Answer : Calm climate

Sudden fall of mercury level in Barometer indicates?

Description : Sudden fall of mercury level in Barometer indicates?

Last Answer : Storm

What happens to the level of mercury in the barometer tube when it is taken down a coal mine? -Do You Know?

Description : What happens to the level of mercury in the barometer tube when it is taken down a coal mine? -Do You Know?

Last Answer : The temperature will increase as one moves down the Earth's crust. and since there is almost very less wind so the warm will be not able to distribute the temp. and moderate it. Hence the Mercury will rise in the barometer tube.

What happens to the level of mercury in the barometer tube when it is taken down a coal mine?

Description : What happens to the level of mercury in the barometer tube when it is taken down a coal mine?

Last Answer : – It rises

A barometer is kept inside a bell jar. Air is slowly pumped out of the jar. (1) The mercury level starts rising (2) The mercury level starts falling (3) The mercury level does not change (4) The bell jar breaks up

Description : A barometer is kept inside a bell jar. Air is slowly pumped out of the jar. (1) The mercury level starts rising (2) The mercury level starts falling (3) The mercury level does not change (4) The bell jar breaks up

Last Answer : (1) The mercury level starts rising Explanation: As the pump removes the air from the bell jar the pressure obviously reduces around the barometer. The reduction in pressure around the barometer leads it to expand. As the pump removes air from the jar, the mercury level rises.

A barometer is kept inside a bell jar. Air is slowly pumped out of the jar. (1) The mercury level starts rising (2) The mercury level starts falling (3) The mercury level does not change (4) The bell jar breaks up

Description : A barometer is kept inside a bell jar. Air is slowly pumped out of the jar. (1) The mercury level starts rising (2) The mercury level starts falling (3) The mercury level does not change (4) The bell jar breaks up

Last Answer : (1) The mercury level starts rising Explanation: As the pump removes the air from the bell jar the pressure obviously reduces around the barometer. The reduction in pressure around the barometer leads it to expand. As the pump removes air from the jar, the mercury level rises.

What happens to the level of mercury in the barometer tube when it is taken down a coal mine?

Description : What happens to the level of mercury in the barometer tube when it is taken down a coal mine?

Last Answer : It rises

1. Which tissue is responsible for the secondary growth? 2. By whom the salary and perquisites of the Prime Minister of India are decided? 3. What happens to the level of mercury in the barometer tube when it is taken down a coal mine? 4. Mac Mohan Line demarcates the boundary between which countries? 5. When Babur invaded India who was the ruler of Vijayanagara empire in South India?

Description : 1. Which tissue is responsible for the secondary growth? 2. By whom the salary and perquisites of the Prime Minister of India are decided? 3. What happens to the level of mercury in the ... river basin is called Ruhr of India'? 20. During which ruler were Upanishads translated into Persian?

Last Answer : Answer : 1. Cambium 2. Parliament 3. It rises 4. India and China 5. Krishna Deva Raya 6. Generation 7. Dehradun 8. Collenchyma 9. Konkan coast 10. Iltutmish 11. The Ministry is dissolved 12. ... 14. Tapti 15. Aurangzeb 16. Jagdish Bhagwati 17. Hypothalmus 18. The President 19. Damodar 20. Shah Jahan

A barometer is kept inside a bell jar. Air is slowly pumped out of the jar. (1) The mercury level starts rising (2) The mercury level starts falling (3) The mercury level does not change (4) The bell jar breaks up

Description : A barometer is kept inside a bell jar. Air is slowly pumped out of the jar. (1) The mercury level starts rising (2) The mercury level starts falling (3) The mercury level does not change (4) The bell jar breaks up

Last Answer : The mercury level starts rising

People living at sea level have around 5 million RBC per cubic millimeter of their blood whereas those living at an altitude to 5400 metres have around 8 million. This is because at high altitude (a) people eat more nutritive food, therefore more RBCs are formed (b) people get pollution-free air to breath and more oxygen is available (c) atmospheric O2 level is less and hence more RBCs are needed to absorb the required amount of O2 to survive (d) there is more UV radiation which enhances RBC production.

Description : People living at sea level have around 5 million RBC per cubic millimeter of their blood whereas those living at an altitude to 5400 metres have around 8 million. This is because at high altitude ... required amount of O2 to survive (d) there is more UV radiation which enhances RBC production.

Last Answer : (c) atmospheric O2 level is less and hence more RBCs are needed to absorb the required amount of O2 to survive

Choose the wrong statement. Alcohol is used in manometer, because (A) Its vapour pressure is low (B) It provides suitable meniscus for the inclined tube (C) Its density is less (D) It provides longer length for a given pressure difference

Description : Choose the wrong statement. Alcohol is used in manometer, because (A) Its vapour pressure is low (B) It provides suitable meniscus for the inclined tube (C) Its density is less (D) It provides longer length for a given pressure difference

Last Answer : Answer: Option A

If a meterologist says that air pressure is getting lower what would you expect to see happen to torriclli's mercury barometer?

Description : If a meterologist says that air pressure is getting lower what would you expect to see happen to torriclli's mercury barometer?

Last Answer : Feel Free to Answer

Alcohol is used in manometers because (A) It has low vapour pressure (B) It is clearly visible (C) It has low surface tension (D) It can provide longer column due to low density

Description : Alcohol is used in manometers because (A) It has low vapour pressure (B) It is clearly visible (C) It has low surface tension (D) It can provide longer column due to low density

Last Answer : Answer: Option D

A common fluorescent tube contains (a) sodium vapour (b) argon at low pressure (c) mercury vapour at low pressure (d) mercuric oxide and neon

Description : A common fluorescent tube contains (a) sodium vapour (b) argon at low pressure (c) mercury vapour at low pressure (d) mercuric oxide and neon

Last Answer : Ans:(c)

Explain with neat circuit diagram, low pressure mercury vapour lamp.

Description : Explain with neat circuit diagram, low pressure mercury vapour lamp.

Last Answer : Diagram of low pressure mercury vapour lamp:  Working:-  Whenever 1-ph, 230V, AC Supply is provided to the discharge tube of MVL initially to current will flow from Phase to the ... Capacitor: The function of power factor improvement capacitor is to improve the power factor 0.5 to 0.95 

What are the best pennies to used in a craft, pre-1980 ones that are pure copper but need lots of shining, or more current ones that are an alloy, but require little shining?

Description : What are the best pennies to used in a craft, pre-1980 ones that are pure copper but need lots of shining, or more current ones that are an alloy, but require little shining?

Last Answer : answer:Throw them in a non-metal bowl with ¼ cup white vinegar and 1 tsp of salt. Wait a bit, then rinse off with some water. Easy peasy! Also, the different shades of pennies can be great for other crafts.

Ice is packed in saw dust because – (1) saw dust will not get melted easily. (2) saw dust is poor conductor of heat. (3) saw dust is a good conductor of heat. (4) saw dust does not stick to the ice.

Description : Ice is packed in saw dust because – (1) saw dust will not get melted easily. (2) saw dust is poor conductor of heat. (3) saw dust is a good conductor of heat. (4) saw dust does not stick to the ice.

Last Answer : (2) saw dust is poor conductor of heat. Explanation: ice needs to absorb heat energy to melt and become water (called latent heat of fusion). Since saw-dust is a poor conductor of heat, it takes ... required heat energy. This allows ice to remain in solid state for more time when packed in saw dust.

Ice is packed in saw dust because (1) saw dust will not get melted easily. (2) saw dust is poor conductor of heat. (3) saw dust is a good conductor of heat. (4) saw dust does not stick to the ice.

Description : Ice is packed in saw dust because (1) saw dust will not get melted easily. (2) saw dust is poor conductor of heat. (3) saw dust is a good conductor of heat. (4) saw dust does not stick to the ice.

Last Answer : saw dust is poor conductor of heat.

Mercury is an ideal barometric fluid mainly due to its(A) High density (B) Low compressibility (C) Low capillary action (D) Very low vapor pressure

Description : Mercury is an ideal barometric fluid mainly due to its (A) High density (B) Low compressibility (C) Low capillary action (D) Very low vapor pressure

Last Answer : (D) Very low vapor pressure

Describe the construction of high pressure mercury vapour lamp with neat sketch

Description :  Describe the construction of high pressure mercury vapour lamp with neat sketch

Last Answer : Construction:-  It consists of an inner bulb generally of silicon, to withstand high temperatures. The bulb contains a small quantity of mercury and argon. It is protected by outer glass, this ... : The function of power factor improvement capacitor is to improve the power factor 0.5 to 0.95

Which liquid is used in an aneroid barometer? A. Mercury B. Alcohol C. Water D. None (Answer)

Description : Which liquid is used in an aneroid barometer? A. Mercury B. Alcohol C. Water D. None (Answer)

Last Answer : D. None (Answer)

If mercury in a barometer is replaced by water, the height of 3.75 cm of mercury will be following cm of water (A) 51 cm (B) 50 cm (C) 52 cm (D) 52.2 cm

Description : If mercury in a barometer is replaced by water, the height of 3.75 cm of mercury will be following cm of water (A) 51 cm (B) 50 cm (C) 52 cm (D) 52.2 cm

Last Answer : Answer: Option A

. Lap joints are preferred over butt joints in soldering/brazing, because these joints are (A) Weaker in tension but stronger in shear (B) Weaker in shear but stronger in tension (C) Stronger in both shear and tension (D) The lap joints are easily made

Description : . Lap joints are preferred over butt joints in soldering/brazing, because these joints are (A) Weaker in tension but stronger in shear (B) Weaker in shear but stronger in tension (C) Stronger in both shear and tension (D) The lap joints are easily made

Last Answer : r: Option D

Water is used in a hot water bag because – (1) It is easily available (2) It has high specific gravity (3) It has high specific heat (4) It is a liquid substance

Description : Water is used in a hot water bag because – (1) It is easily available (2) It has high specific gravity (3) It has high specific heat (4) It is a liquid substance

Last Answer : (3) It has high specific heat Explanation: Water has the highest specific heat of any known substance except hydrogen; that is, it requires more heat to raise the temperature of water a definite ... to raise the temperature of an equal amount of any other substance the same number of degrees.

At a fixed total pressure, humidity depends only on the (A) Partial pressure of vapour in the mixture (B) Heat capacity of the vapour (C) Density of the vapour (D) None of these

Description : At a fixed total pressure, humidity depends only on the (A) Partial pressure of vapour in the mixture (B) Heat capacity of the vapour (C) Density of the vapour (D) None of these

Last Answer : (A) Partial pressure of vapour in the mixture

Clausius-Clapeyron Equation gives accurate result, when the (A) Vapour pressure is relatively low and the temperature does not vary over wide limits (B) Vapour obeys the ideal gas law and the latent heat of vaporisation is constant (C) Volume in the liquid state is negligible compared with that in the vapour state (D) All (A), (B) and (C)

Description : Clausius-Clapeyron Equation gives accurate result, when the (A) Vapour pressure is relatively low and the temperature does not vary over wide limits (B) Vapour obeys the ideal gas law and the latent heat of ... is negligible compared with that in the vapour state (D) All (A), (B) and (C)

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

Mercury is dangerous when it turns into vapour form because of, A. It is accumulative and causes liver poison B. It is accumulative and causes kidney poison C. It induces neoplasia in the liver D. It is accumulative and causes brain poison E. It induces neoplasia in the brain

Description : Mercury is dangerous when it turns into vapour form because of, A. It is accumulative and causes liver poison B. It is accumulative and causes kidney poison C. It induces neoplasia in the liver D. It is accumulative and causes brain poison E. It induces neoplasia in the brain

Last Answer : D. It is accumulative and causes brain poison

Mercury is commonly used as a thermometric fluid rather than water because (1) specific heat of mercury is less than water (2) specific heat of mercury is more than water (3) mercury has greater visibility than water (4) density of mercury is more than the water

Description : Mercury is commonly used as a thermometric fluid rather than water because (1) specific heat of mercury is less than water (2) specific heat of mercury is more than water (3) mercury has greater visibility than water (4) density of mercury is more than the water

Last Answer : (3) mercury has greater visibility than water Explanation: One special kind of mercury-inglass thermometer, called a maximum thermometer, works by having a constriction in the neck close to the bulb.

Mercury is commonly used as a thermometric fluid rather than water because (1) specific heat of mercury is less than water (2) specific heat of mercury is more than water (3) mercury has greater visibility than water (4) density of mercury is more than the water

Description : Mercury is commonly used as a thermometric fluid rather than water because (1) specific heat of mercury is less than water (2) specific heat of mercury is more than water (3) mercury has greater visibility than water (4) density of mercury is more than the water

Last Answer : (3) mercury has greater visibility than water Explanation: One special kind of mercury-inglass thermometer, called a maximum thermometer, works by having a constriction in the neck close to the bulb.

What does the rise of mercury in a barometer indicate? -Do You Know?

Description : What does the rise of mercury in a barometer indicate? -Do You Know?

Last Answer : answer:

Does the height of the mercury column of barometer increase gradually ?

Description : Does the height of the mercury column of barometer increase gradually ?

Last Answer : Answer : As the height of the mercury column of the barometer gradually decreases, the water vapor increases.

If to torricelli had drilled a little hole at the top of the glass tube holding his mercury column what would have happened to his barometer?

Description : If to torricelli had drilled a little hole at the top of the glass tube holding his mercury column what would have happened to his barometer?

Last Answer : He would not have had a barometer. He would have had a glass tube stuck into a bowl of Mercury, with nothing in it. Because once the hole was made the vacuum would be gone and the Mercury would fall back down to the bowl.It takes the vacuum in the tube to create a barometer.

What does the rise of mercury in a barometer indicate?

Description : What does the rise of mercury in a barometer indicate?

Last Answer : – Fair weather

An ideal liquid refrigerant should (A) Not have a sub-atmospheric vapour pressure at the temperature in the refrigerator coils (B) Not have unduly high vapour pressure at the condenser temperature (C) Both (A) and (B) (D) Have low specific heat

Description : An ideal liquid refrigerant should (A) Not have a sub-atmospheric vapour pressure at the temperature in the refrigerator coils (B) Not have unduly high vapour pressure at the condenser temperature (C) Both (A) and (B) (D) Have low specific heat

Last Answer : (C) Both (A) and (B)

Mercury electrolytic cells are preferred over diaphragm electrolytic cell (for production of caustic soda), as it (A) Has larger production capacity per unit cell (B) Consumes less power per ton of Cl2 produced (C) Produces high purity (70%) caustic soda directly (D) All (A), (B) and (C)

Description : Mercury electrolytic cells are preferred over diaphragm electrolytic cell (for production of caustic soda), as it (A) Has larger production capacity per unit cell (B) Consumes less power per ton of Cl2 produced (C) Produces high purity (70%) caustic soda directly (D) All (A), (B) and (C)

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

The best conductor of heat among liquid is (a) water (b) mercury (c) ether (d) alcohol

Description : The best conductor of heat among liquid is (a) water (b) mercury (c) ether (d) alcohol

Last Answer : Ans:(b)

The best conductor of heat among the following is – (1) alcohol (2) mercury (3) ether (4) water

Description : The best conductor of heat among the following is – (1) alcohol (2) mercury (3) ether (4) water

Last Answer : (2) mercury Explanation: Since mercury is 13+ times as dense as water, a given volume of mercury would carry about 4.4 times as much heat, so mercury is best conductor of heat among the given ... for temperature and pressure. Mercury has one of the narrowest ranges of its liquid state of any metal.

The best conductor of heat among the following is (1) alcohol (2) mercury (3) ether (4) water

Description : The best conductor of heat among the following is (1) alcohol (2) mercury (3) ether (4) water

Last Answer : mercury

Water is not suitable as a calorimetric substance because it – (1) has high specific heat (2) is a good conductor (3) has high boiling point (4) low latent heat of vaporization

Description : Water is not suitable as a calorimetric substance because it – (1) has high specific heat (2) is a good conductor (3) has high boiling point (4) low latent heat of vaporization

Last Answer : (1) has high specific heat Explanation: The specific heat of water is higher than all other common substances. Hence, water is used for heating purposes (as in hot water bottles) and for cooling ... the liquids, mercury has the lowest specific heat due to which it is used as a thermometric liquid.

Water is not suitable as a calorimetric substance because it : (1) has high specific heat (2) is a good conductor (3) has high boiling point (4) low latent heat of vapourization

Description : Water is not suitable as a calorimetric substance because it : (1) has high specific heat (2) is a good conductor (3) has high boiling point (4) low latent heat of vapourization

Last Answer : has high specific heat

In the diving apparatus, helium is used along with oxygen, because it is (A) Easily available (B) Not soluble in blood at high pressure (C) Lighter than nitrogen (D) Completely miscible with oxygen

Description : In the diving apparatus, helium is used along with oxygen, because it is (A) Easily available (B) Not soluble in blood at high pressure (C) Lighter than nitrogen (D) Completely miscible with oxygen

Last Answer : (B) Not soluble in blood at high pressure

Moisture in a substance exerting an equilibrium vapour pressure less than that of pure liquid at the same temperature is called the __________ moisture. (A) Bound (B) Unbound (C) Critical (D) None of these

Description : Moisture in a substance exerting an equilibrium vapour pressure less than that of pure liquid at the same temperature is called the __________ moisture. (A) Bound (B) Unbound (C) Critical (D) None of these

Last Answer : (A) Bound

Moisture in a solid exerting an equilibrium vapour pressure equal to that of the pure liquid at the same temperature is called the __________ moisture. (A) Unbound (B) Critical (C) Free (D) Bound

Description : Moisture in a solid exerting an equilibrium vapour pressure equal to that of the pure liquid at the same temperature is called the __________ moisture. (A) Unbound (B) Critical (C) Free (D) Bound

Last Answer : (A) Unbound

Whole circle bearing of a line is preferred to a quadrantal bearing merely because (A) Bearing is not completely specified by an angle (B) Bearing is completely specified by an angle (C) Sign of the correction of magnetic declination is different in different quadrants (D) Its Trigonometrical values may be extracted from ordinary tables easily

Description : Whole circle bearing of a line is preferred to a quadrantal bearing merely because (A) Bearing is not completely specified by an angle (B) Bearing is completely specified by an angle ... different in different quadrants (D) Its Trigonometrical values may be extracted from ordinary tables easily

Last Answer : (B) Bearing is completely specified by an angle

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