The surface tension of water is at 25°C

The surface tension of water is at 25°C
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 Ans. 72.7 dyne/cm2
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The pH of water at 25°C is 7. When it is heated to 100°C, then what will be the pH of water?

Description : The pH of water at 25°C is 7. When it is heated to 100°C, then what will be the pH of water?

Last Answer : – Remains same

The density of water is 1 g/cc. This is strictly valid at – (1) 0°C (2) 4°C (3) 25°C (4) 100°C

Description : The density of water is 1 g/cc. This is strictly valid at – (1) 0°C (2) 4°C (3) 25°C (4) 100°C

Last Answer : (2) 4°C Explanation: Water never has an absolute density because its density varies with temperature. Water has its maximum density of 1 g/cm3 at 4 degrees Celsius. When the temperature changes from either greater or ... 1 g/cm3. Water has the maximum density of 1 g/cm3 only when it is pure water.

The pH of water at 25°C is 7.

Description : The pH of water at 25°C is 7.

Last Answer : Remains same

1 kg of a saturated aqueous solution of a highly soluble component A at 60°C is cooled to 25°C. The solubility limits of A are (0.6 kgA/kg water) at 60°C and (0.2 kgA/kg water) at 25°C. The amount in kg of the crystals formed is: (A) 0.4 (B) 0.25 (C) 0.2 (D) 0.175

Description : 1 kg of a saturated aqueous solution of a highly soluble component A at 60°C is cooled to 25°C. The solubility limits of A are (0.6 kgA/kg water) at 60°C and (0.2 kgA/kg water) at 25°C. The amount in kg of the crystals formed is: (A) 0.4 (B) 0.25 (C) 0.2 (D) 0.175

Last Answer : (C) 0.2

The rough value of diffusion co-efficient of water vapor into air at 25°C may be about __________ cm2 /sec. (A) 0.25 (B) 2.5 (C) 1.25 (D) 0.0025

Description : The rough value of diffusion co-efficient of water vapor into air at 25°C may be about __________ cm2 /sec. (A) 0.25 (B) 2.5 (C) 1.25 (D) 0.0025

Last Answer : (A) 0.25

Unsaturated air (with dry bulb and wet bulb temperatures being 45°C and 25°C respectively) is passed through a water spray chamber maintained at 23°C. The air will be cooled and (A) Humidified with wet bulb temperature decreasingB) Humidified at constant wet bulb temperature(C) Dehumidified(D) None of these

Description : Unsaturated air (with dry bulb and wet bulb temperatures being 45°C and 25°C respectively) is passed through a water spray chamber maintained at 23°C. The air will be cooled and (A) ... temperature decreasing B) Humidified at constant wet bulb temperature (C) Dehumidified (D) None of these

Last Answer : (A) Humidified with wet bulb temperature decreasing

Unsaturated air (with dry and wet bulb temperatures being 35 and 25°C respectively) is passed through water spray chamber maintained at 35°C. The air will be (A) Cooled (B) Humidified (C) Both (A) & (B) (D) Dehumidified

Description : Unsaturated air (with dry and wet bulb temperatures being 35 and 25°C respectively) is passed through water spray chamber maintained at 35°C. The air will be (A) Cooled (B) Humidified (C) Both (A) & (B) (D) Dehumidified

Last Answer : (B) Humidified

In Joule's experiment, an insulated container contains 20 kg of waterinitially at 25°C. It is stirred by an agitator, which is made to turn by aslowly falling body weighing 40 kg through a height of 4 m. The process isrepeated 500 times. The acceleration due to gravity is 9.8 ms-2. Neglectingthe heat capacity of agitator, the temperature of water (in °C) is(A) 40.5(B) 34.4(C) 26.8(D) 25

Description : In Joule's experiment, an insulated container contains 20 kg of waterinitially at 25°C. It is stirred by an agitator, which is made to turn by a slowly falling body weighing 40 kg through a height of 4 m. The process is repeated ... temperature of water (in °C) is (A) 40.5 (B) 34.4 (C) 26.8 (D) 25

Last Answer : (B) 34.4

A solid metallic block weighing 5 kg has an initial temperature of 500°C. 40 kg of water initially at 25°C is contained in a perfectly insulated tank. The metallic block is brought into contact with water. Both of them come to equilibrium. Specific heat of block material is 0.4 kJ.kg-1. K-1. Ignoring the effect of expansion and contraction and also the heat capacity to tank, the total entropy change in kJ.kg-1, K-1is (A) -1.87 (B) 0 (C) 1.26 (D) 3.91

Description : A solid metallic block weighing 5 kg has an initial temperature of 500°C. 40 kg of water initially at 25°C is contained in a perfectly insulated tank. The metallic block is brought into contact with water. Both of them come to equilibrium. ... .kg-1, K-1is (A) -1.87 (B) 0 (C) 1.26 (D) 3.91

Last Answer : (B) 0

The density of water is 1 g/cc. This is strictly valid at (1) 0°C (2) 4°C (3) 25°C (4) 100°C

Description : The density of water is 1 g/cc. This is strictly valid at (1) 0°C (2) 4°C (3) 25°C (4) 100°C

Last Answer :  4°C

A temperature difference of 25°C is equivalent to a temperature difference of howmany F? -Do You Know?

Description : A temperature difference of 25°C is equivalent to a temperature difference of howmany F? -Do You Know?

Last Answer : answer:

At 25°C and 760 mm of Hg pressure a gas occupies 600 mL volume.

Description : At 25°C and 760 mm of Hg pressure a gas occupies 600 mL volume.

Last Answer : At 25°C and 760 mm of Hg pressure a gas occupies 600 mL volume. What will be its pressure at ... temperature is 10°C and volume of the gas 640 mL ?

If two temperatures differ by 25°C on Celsius scale, the difference in temperature on Fahrenheit scale is

Description : If two temperatures differ by 25°C on Celsius scale, the difference in temperature on Fahrenheit scale is

Last Answer : If two temperatures differ by 25°C on Celsius scale, the difference in temperature on Fahrenheit scale is (A) 65° (B) 45° (C) 38° (D) 25°

Bence jones proteinurial characterized by (A) Non-heat coagulability (B) Heat coagulability at 100°C (C) Heat coagulability at 45 to 60°C (D) Precipitation at 25°C

Description : Bence jones proteinurial characterized by (A) Non-heat coagulability (B) Heat coagulability at 100°C (C) Heat coagulability at 45 to 60°C (D) Precipitation at 25°C

Last Answer : Answer : C

The two elements that exist as liquids at 25°C are (a) Mercury and lithium (b) Mercury and caesium (c) Bromine and mercury (d) Mercury and argon

Description : The two elements that exist as liquids at 25°C are (a) Mercury and lithium (b) Mercury and caesium (c) Bromine and mercury (d) Mercury and argon

Last Answer : Ans:(c)

The average temperature of sewage in India, is A. 10°C B. 15°C C. 20°C D. 25°C

Description : The average temperature of sewage in India, is A. 10°C B. 15°C C. 20°C D. 25°C

Last Answer : ANS: C

5 days-biochemical oxygen demand (BOD5) is taken at a temperature of A. 0°C B. 15°C C. 20°C D. 25°C

Description : 5 days-biochemical oxygen demand (BOD5) is taken at a temperature of A. 0°C B. 15°C C. 20°C D. 25°C

Last Answer : ANS: C

The life expectancy of electrical insulation, is approximately halved for an increased operating temperature of _______________. A. 10°C B. 25°C C. 50°C D. 100°C

Description : The life expectancy of electrical insulation, is approximately halved for an increased operating temperature of _______________. A. 10°C B. 25°C C. 50°C D. 100°C

Last Answer : Answer: A

Which of the following statements about copper wire sized by the AWG rating is correct? A. Number 12 AWG wire has a higher current rating than number 10 AWG wire. B. Number 10 AWG wire has a higher dielectric strength than number 12 AWG wire. C. Number 12 AWG wire is larger than Number 10 AWG wire. D. Number 12 AWG wire at 25°C has more resistance per 1000 feet than No. 10 AWG wire at 25°C.

Description : Which of the following statements about copper wire sized by the AWG rating is correct? A. Number 12 AWG wire has a higher current rating than number 10 AWG wire. B. Number 10 AWG wire has a higher ... Number 12 AWG wire at 25°C has more resistance per 1000 feet than No. 10 AWG wire at 25°C.

Last Answer : Answer: D

Which of the following statements concerning copper wire sized by AWG numbers is correct? A. Number 12 AWG wire has a higher current rating than 10 AWG wire. B. Number 12 AWG wire at 25°C has more resistance per 1000 ft than 10 AWG wire at 25°C. C. Number 10 AWG wire has a higher dielectric strength than 12 AWG wire. D. Number 12 AWG wire is larger than number 10 AWG wire.

Description : Which of the following statements concerning copper wire sized by AWG numbers is correct? A. Number 12 AWG wire has a higher current rating than 10 AWG wire. B. Number 12 AWG wire at 25°C has more ... dielectric strength than 12 AWG wire. D. Number 12 AWG wire is larger than number 10 AWG wire.

Last Answer : Answer: B

A temperature difference of 25°C is equivalent to a temperature difference of howmany F?

Description : A temperature difference of 25°C is equivalent to a temperature difference of howmany F?

Last Answer : 45° F

A mixture of 10% C6H6 vapour in air at 25°C and 750 mm Hg has a dew point of 20°C. Its dew point at 30°C and 700 mm Hg will be around __________ °C. (A) 21.7 (B) 20 (C) 27.3 (D) 18.7

Description : A mixture of 10% C6H6 vapour in air at 25°C and 750 mm Hg has a dew point of 20°C. Its dew point at 30°C and 700 mm Hg will be around __________ °C. (A) 21.7 (B) 20 (C) 27.3 (D) 18.7

Last Answer : (D) 18.7

The wet and 'dry bulb temperature for a vapour-gas mixture are 25°C and 30°C respectively. If the mixture is heated to 45°C at constant pressure, the wet bulb temperature will be __________ °C. (A) 25 (B) > 25 (C) < 25 (D) - 25

Description : The wet and 'dry bulb temperature for a vapour-gas mixture are 25°C and 30°C respectively. If the mixture is heated to 45°C at constant pressure, the wet bulb temperature will be __________ °C. (A) 25 (B) > 25 (C) < 25 (D) - 25

Last Answer : (B) > 25

The heat flux (from outside to inside) across an insulating wall with thermal conductivity, K = 0.04 W/m.°K and thickness 0.16m is 10 W/m2 . The temperature of the inside wall is - 5°C. The outside wall temperature is (A) 25°C (B) 30°C (C) 35°C (D) 40°C

Description : The heat flux (from outside to inside) across an insulating wall with thermal conductivity, K = 0.04 W/m.°K and thickness 0.16m is 10 W/m2 . The temperature of the inside wall is - 5°C. The outside wall temperature is (A) 25°C (B) 30°C (C) 35°C (D) 40°C

Last Answer : (C) 35°C

Volatile oil are those oil which can evaporate at : a. 25°C b. 40°C c. 50°C d. 65°C

Description : Volatile oil are those oil which can evaporate at : a. 25°C b. 40°C c. 50°C d. 65°C

Last Answer : 25°C

High seed germination in cucumber occurs under temperature range of: a. 20-25°C b. 25-30°C c. 15-25°C d. None of above

Description : High seed germination in cucumber occurs under temperature range of: a. 20-25°C b. 25-30°C c. 15-25°C d. None of above

Last Answer : 20-25°C

Optimum temperature for potato tuber formation is a. 20-22°C b. 25-30°C c. 22-25°C d. All of these

Description : Optimum temperature for potato tuber formation is a. 20-22°C b. 25-30°C c. 22-25°C d. All of these

Last Answer : 20-22°C

Walls of a cubical oven are of thickness l, and they are made of material of thermal conductivity k. The temperature inside the oven is 100°C and the inside heat transfer co-efficient is ‘3k/l’. If the wall temperature on the outside is held at 25°C, what is the inside wall temperature in degree centigrade?(A) 35.5 (B) 43.75 (C) 81.25 (D) 48.25

Description : Walls of a cubical oven are of thickness l, and they are made of material of thermal conductivity k. The temperature inside the oven is 100°C and the inside heat transfer co-efficient is 3k/l'. If the wall temperature ... wall temperature in degree centigrade? (A) 35.5 (B) 43.75 (C) 81.25 (D) 48.25

Last Answer : (C) 81.25

Optimum temperature for maximum crop development in wheat is (a) 10-15°C(b) 20-25°C (c) 25-30°C (d) 30-35°C

Description : Optimum temperature for maximum crop development in wheat is (a) 10-15°C(b) 20-25°C (c) 25-30°C (d) 30-35°C

Last Answer : (b) 20-25°C

The optimum cardinal temparature point for germination of rice seeds is– 1) 20°C – 25°C 2) 18°C – 22°C 3) 30°C – 32°C 4) 37°C – 39°C

Description : The optimum cardinal temparature point for germination of rice seeds is– 1) 20°C – 25°C 2) 18°C – 22°C 3) 30°C – 32°C 4) 37°C – 39°C

Last Answer : 1) 20°C – 25°C

Which of the following environmental conditions are essential for optimum growth of Mucor on a piece of bread ? A. Temperature of about 25°C B. Temperature of about 5°C C. Relative humidity of about 5% D. Relative humidity of about 95% E. A shady place F. A brightly illuminated place Choose the answer from the following options. (a) B, C and F only (b) A, C and E only (c) A, D and E only (d) B, D and E only

Description : Which of the following environmental conditions are essential for optimum growth of Mucor on a piece of bread ? A. Temperature of about 25°C B. Temperature of about 5°C C. Relative humidity of about 5% D. Relative humidity of about 95% ... b) A, C and E only (c) A, D and E only (d) B, D and E only

Last Answer : (c) A, D and E only

Which of the following are optimum temperature conditions for making benzenediazonium chloride from aniline? (a) 0°C to 10°C (b) 20°C to 25°C (c) 30°C to 40°C (d) 45°C to 50°C

Description : Which of the following are optimum temperature conditions for making benzenediazonium chloride from aniline? (a) 0°C to 10°C (b) 20°C to 25°C (c) 30°C to 40°C (d) 45°C to 50°C

Last Answer : 0°C to 10°C

Process conditions in fermentator used for production of penicillin is (A) 25°C, 2 atm (B) 50°C, l0 atm (C) 30°C, 200 mm Hg (absolute) (D) 90°C, 45 atm

Description : Process conditions in fermentator used for production of penicillin is (A) 25°C, 2 atm (B) 50°C, l0 atm (C) 30°C, 200 mm Hg (absolute) (D) 90°C, 45 atm

Last Answer : (A) 25°C, 2 atm

A standard steel tape of length 30 m and cross-section 15 × 1.0 mm was standardised at 25°C and at 30 kg pull. While measuring a base line at the same temperature, the pull applied was 40 kg. If the modulus of elasticity of steel tape is 2.2 × 106 kg/cm2 , the correction to be applied is (A) - 0.000909 m (B) + 0.0909 m (C) 0.000909 m (D) None of these

Description : A standard steel tape of length 30 m and cross-section 15 1.0 mm was standardised at 25°C and at 30 kg pull. While measuring a base line at the same temperature, the pull applied was 40 kg. If the modulus of elasticity of ... (A) - 0.000909 m (B) + 0.0909 m (C) 0.000909 m (D) None of these

Last Answer : (A) - 0.000909 m

A thin, flat & square plate measuring 2 m × 2 m is freely hanging in ambient air at 25°C. It is exposed to the solar radiation falling on one side of the plate at the rate of 500 W/m2. The plate temperature will remain constant at 30°C, if the convective heat transfer co-efficient is __________ W/m2 °C. (A) 50 (B) 100 (C) 150 (D) 200

Description : A thin, flat & square plate measuring 2 m 2 m is freely hanging in ambient air at 25°C. It is exposed to the solar radiation falling on one side of the plate at the rate of 500 W/m2. The plate temperature will ... heat transfer co-efficient is __________ W/m2 °C. (A) 50 (B) 100 (C) 150 (D) 200

Last Answer : (B) 100

The Manufacturer of aeration devices reports the oxygen transfer rate of the device obtained through laboratory tests carried under standard conditions. Such standard condition are : (a) Wastewater at zero DO, 25°C and 760 mm Hg (b) Tapwater at zero DO, 0°C and 700 mm Hg (c) Tapwater at zero DO, 20°C and 760 mm Hg (d) Wastewater at zero DO, 0°C and 700 mm Hg

Description : The Manufacturer of aeration devices reports the oxygen transfer rate of the device obtained through laboratory tests carried under standard conditions. Such standard condition are : (a) Wastewater at zero DO, 25°C and 760 mm ... DO, 20°C and 760 mm Hg (d) Wastewater at zero DO, 0°C and 700 mm Hg

Last Answer : (c) Tapwater at zero DO, 20°C and 760 mm Hg

The temperature condition for storage of drug products under cold temperature is given as : (A) temperature between 8°C and 25°C (B) temperature below 20 C (C) temperature at 0°C (D) temperature between 2c C and S: C

Description : The temperature condition for storage of drug products under cold temperature is given as : (A) temperature between 8°C and 25°C (B) temperature below 20 C (C) temperature at 0°C (D) temperature between 2c C and S: C

Last Answer : (D) temperature between 2c C and S: C

The attraction of solid surface for water molecules is called as

Description : The attraction of solid surface for water molecules is called as

Last Answer : Ans. Adhesion

The fine earth covering land surface acts as a reservoir of nutrients and water

Description : The fine earth covering land surface acts as a reservoir of nutrients and water

Last Answer : Ans. Soil

Stomata that is present on only under surface of leaf.

Description : Stomata that is present on only under surface of leaf.

Last Answer : Ans. Apple and Mulberry type

The types of stomata mostly present on lower surface of leaves

Description : The types of stomata mostly present on lower surface of leaves

Last Answer : Ans. Potato type

The weight of one hectare of surface soil (O-15 cm) in kilograms

Description : The weight of one hectare of surface soil (O-15 cm) in kilograms

Last Answer : Ans. 2.24×10 6 kg/ha

Which surface has least Albedo?

Description : Which surface has least Albedo?

Last Answer : Ans. Moist black soil

North of the equator, surface winds are known as

Description : North of the equator, surface winds are known as

Last Answer : Ans. Northeast trade winds

Does surface tension of water decrease with rising temperature?

Description : Does surface tension of water decrease with rising temperature?

Last Answer : It decreases as temperature goes up.

When some detergent is added to water, what will be the surface tension? -General Knowledge

Description : When some detergent is added to water, what will be the surface tension? -General Knowledge

Last Answer : The answer is 'Increases'

When some detergent is added to water, what will be the surface tension? -General Knowledge

Description : When some detergent is added to water, what will be the surface tension? -General Knowledge

Last Answer : answer:

When some detergent is added to water, what will be the surface tension? -General Knowledge

Description : When some detergent is added to water, what will be the surface tension? -General Knowledge

Last Answer : answer:

The following observations were taken for determining surface tension T of water by capillary method: (A) 0.15%  (B) 1.5% 

Description : The following observations were taken for determining surface tension T of water by capillary method: (A) 0.15%  (B) 1.5% 

Last Answer : The following observations were taken for determining surface tension T of water by capillary method: diameter of capillary ... (C) 2.4% (D) 10%

The water, retained by the soil in capillary pores (micropores), against gravity (-1/3 to - 31 bar) by the force of surface tension

Description : The water, retained by the soil in capillary pores (micropores), against gravity (-1/3 to - 31 bar) by the force of surface tension

Last Answer : Ans.Capillary water