Assertion :- When a rubber band is stretched entropy increases. Reason :- During expansion entropy increases.

Assertion :- When a rubber band is stretched entropy increases. Reason :- During expansion entropy increases.
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Assertion :- When a rubber band is stretched entropy increases. Reason :- During expansion entropy ... D. If both Assertion & Reason are false.
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A rubber band originally 30cm long is stretched to a length of 32cm by certain load. What is the strain produced?

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Tyler stretches a rubber band so that it is tight. The stretched rubber band has?

Description : Tyler stretches a rubber band so that it is tight. The stretched rubber band has?

Last Answer : it has potential energy

Assertion :- In an isolated system the entropy increases due to spontanous process. Reason :- The processes in an isolated system are adiabatic.

Description : Assertion :- In an isolated system the entropy increases due to spontanous process. Reason :- The processes in an isolated system are adiabatic.

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Assertion :- Entropy of system increases for a spontaneous reactions. Reason :- Enthalpy of reaction always decreases for spontaneous reaction.

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Why is rubber stretched long ?

Description : Why is rubber stretched long ?

Last Answer : Rubber is made up of polymer molecules. That is, the molecules join one another and form a long chain. The chains are rolled up in normal condition. Then they are compressed. When the two ends ... to wipe pencil stains is small. When the pressure is removed, it returns to its previous shape]

Synthetic rubber (A) Deforms, if stretched to double of its original dimension (B) Is brittle at low temperature (C) Is softer at higher temperature (D) Is highly permeable to air & water and is readily attacked by chemicals & atmospheric gases

Description : Synthetic rubber (A) Deforms, if stretched to double of its original dimension (B) Is brittle at low temperature (C) Is softer at higher temperature (D) Is highly permeable to air & water and is readily attacked by chemicals & atmospheric gases

Last Answer : (D) Is highly permeable to air & water and is readily attacked by chemicals & atmospheric gases

Assertion :- Entropy is always constant for a closed system. Reason :- Closed system is always reversible.

Description : Assertion :- Entropy is always constant for a closed system. Reason :- Closed system is always reversible.

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Assertion :- Water in liquid state is more stable than ice at room temperature. Reason :- Water in liquid from has higher entropy than ice.

Description : Assertion :- Water in liquid state is more stable than ice at room temperature. Reason :- Water in liquid from has higher entropy than ice.

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Assertion (A): May endothermic reactions that are not spontaneous at room temperature become spontaneous at high temperature. Reason (R ) : Entropy of

Description : Assertion (A): May endothermic reactions that are not spontaneous at room temperature become spontaneous at high temperature. Reason (R ) : Entropy of

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Assertion: The enthalpy of formation of gaseous oxygen molecules at `298K` and under1 atm is zero. Reason: The entropy of formation of gaseous oxygen

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Assertion (A): Enthalpy of graphite is lower than that of diamond. Reason (R ) : Entropy of graphite is lower than that of diamond.

Description : Assertion (A): Enthalpy of graphite is lower than that of diamond. Reason (R ) : Entropy of graphite is lower than that of diamond.

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During Joule-Thomson expansion of gases (A) Enthalpy remains constant (B) Entropy remains constant (C) Temperature remains constant (D) None of these

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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 expression for entropy change given by, ΔS = - nR ln (P2/P1), holds good for (A) Expansion of a real gas (B) Reversible isothermal volume change (C) Heating of an ideal gas (D) Cooling of a real gas

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Steam undergoes isentropic expansion in a turbine from 5000 kPa and 400°C (entropy = 6.65 kJ/kg K) to 150 kPa) (entropy of saturated liquid = 1.4336 kJ/kg. K, entropy of saturated vapour = 7.2234 kJ/kg. K) The exit condition of steam is (A) Superheated vapour (B) Partially condensed vapour with quality of 0.9 (C) Saturated vapour (D) Partially condensed vapour with quality of 0.1

Description : Steam undergoes isentropic expansion in a turbine from 5000 kPa and 400°C (entropy = 6.65 kJ/kg K) to 150 kPa) (entropy of saturated liquid = 1.4336 kJ/kg. K, entropy of saturated vapour = 7.2234 ... vapour with quality of 0.9 (C) Saturated vapour (D) Partially condensed vapour with quality of 0.1

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Pick out the wrong statement: (A) The expansion of a gas in vacuum is an irreversible process (B) An isometric process is a constant pressure process (C) Entropy change for a reversible adiabatic process is zero (D) Free energy change for a spontaneous process is negative

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The expression for entropy change given by, ΔS = nR ln (V2/V1) + nCvln (T2/T1) is valid for (A) Reversible isothermal volume change (B) Heating of a substance (C) Cooling of a substance (D) Simultaneous heating and expansion of an ideal gas

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Last Answer : (D) Simultaneous heating and expansion of an ideal gas

In __________ process, there is an increase in entropy with no degradation of energy. (A) Isothermal expansion (B) Isochoric heat addition (C) Polytropic expansion (D) Isobaric heat addition

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Last Answer : (A) Isothermal expansion

Pick out the wrong statement. (A) The net change in entropy in any reversible cycle is always zero (B) The entropy of the system as a whole in an irreversible process increases (C) The entropy of the universe tends to a maximum (D) The entropy of a substance does not remain constant during a reversible adiabatic change

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Assertion `:-` Strong pneumotoxic signal results complete filling of lungs. Reason `:-` Strong pneumotaxic singla increases the duration of inspiratio

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Assertion :- Metallic character increases on going down the group Reason :- I.E. decreases on going down the group

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Assertion :- In a redox reaction, the oxidation number of the oxidant decreases while that of reductant increases. Reason :- Oxidant gains electron(s)

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Assertion: Sewage discharge in a water body causes eutrophication. Reason: This increases the organic content in water body and, hence, the growth of

Description : Assertion: Sewage discharge in a water body causes eutrophication. Reason: This increases the organic content in water body and, hence, the growth of

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Assertion : Thyroxine shows calorigenic effect. Reason : Thyroxine shows calorigenic effect. Reason : Thyroxine increases catabolism, produces energy

Description : Assertion : Thyroxine shows calorigenic effect. Reason : Thyroxine shows calorigenic effect. Reason : Thyroxine increases catabolism, produces energy

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Assertion: Phenol is more reactive than benzene towards electrophilic reactions. Reason : The +R effect of OH group increases the electron density on

Description : Assertion: Phenol is more reactive than benzene towards electrophilic reactions. Reason : The +R effect of OH group increases the electron density on

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Assertion (A): The development of agriculture and industry leads to the development of tertiary sector. Reason (R): As the agriculture and industrial sectors develop, the demand for storage, transport, banking, insurance, etc, increases. (a) Both A & R are true and R is the correct explanation of A (b) Both A & R are true but R is not the correct explanation of A. (c) A is true but R is false. (d) Both A & R are false.

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The total entropy change for a system and its surroundings increases, if the process is

Description : The total entropy change for a system and its surroundings increases, if the process is

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When amount of free energy increases entropy?

Description : When amount of free energy increases entropy?

Last Answer : Need answer

When a salt dissolves in water (a) Entropy decreases (b) Entropy increases (c) Free energy increases (d) Heat is liberated

Description : When a salt dissolves in water (a) Entropy decreases (b) Entropy increases (c) Free energy increases (d) Heat is liberated

Last Answer : Ans:(b)

When ice cubes are made, the entropy of water – (1) does not change (2) decreases (3) increases (4) may either increase or decrease depending on the process used

Description : When ice cubes are made, the entropy of water – (1) does not change (2) decreases (3) increases (4) may either increase or decrease depending on the process used

Last Answer : (2) decreases Explanation: When water is frozen into ice, the temperature drops below 0°C. Since the entropy of the solid is less than that of the liquid, the entropy of the water (the system ... decrease is found by dividing the heat of fusion of ice by the temperature for the reversible pathway.

A closed system is cooled reversibly from 100°C to 50°C. If no work is done on the system (A) its internal energy (U) decreases and its entropy (S) increases (B) U and S both decreases (C) U decreases but S is constant (D) U is constant but S decreases

Description : A closed system is cooled reversibly from 100°C to 50°C. If no work is done on the system (A) its internal energy (U) decreases and its entropy (S) increases (B) U and S both decreases (C) U decreases but S is constant (D) U is constant but S decreases

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Pick out the wrong statement. (A) A refrigeration cycle violates the second law of thermodynamics (B) Refrigeration cycle is normally represented by a temperature vs. entropy plot (C) In a refrigerator, work required decreases as the temperature of the refrigerator and the temperature at which heat is rejected increases (D) One ton of refrigeration is equivalent to the rate of heat absorption equal to 3.53 kW

Description : Pick out the wrong statement. (A) A refrigeration cycle violates the second law of thermodynamics (B) Refrigeration cycle is normally represented by a temperature vs. entropy plot (C) In a refrigerator, ... (D) One ton of refrigeration is equivalent to the rate of heat absorption equal to 3.53 kW

Last Answer : (A) A refrigeration cycle violates the second law of thermodynamics

For a spontaneous process, free energy (A) Is zero (B) Increases (C) Decreases whereas the entropy increases (D) And entropy both decrease

Description : For a spontaneous process, free energy (A) Is zero (B) Increases (C) Decreases whereas the entropy increases (D) And entropy both decrease

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When liquid water is converted to steam at 100˚C, the entropy of water  a. increases  b. decreases  c. remains the same  d. none of the above

Description : When liquid water is converted to steam at 100˚C, the entropy of water  a. increases  b. decreases  c. remains the same  d. none of the above

Last Answer : increases

The entropy __________ in an irreversible cyclic process.  A. remains constant  B. decreases  C. increases

Description : The entropy __________ in an irreversible cyclic process.  A. remains constant  B. decreases  C. increases

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When ice cubes are made, the entropy of water (1) does not change (2) decreases (3) increases (4) may either increase or decrease depending on the process used

Description : When ice cubes are made, the entropy of water (1) does not change (2) decreases (3) increases (4) may either increase or decrease depending on the process used

Last Answer : decreases

Which energy transformation will occur when this rubber band is let go?

Description : Which energy transformation will occur when this rubber band is let go?

Last Answer : Potential energy is converted into kinetic energy.

Why does a rubber band become loose after repeated use?

Description : Why does a rubber band become loose after repeated use?

Last Answer : Why does a rubber band become loose after repeated use?

Why is a rubber band a insulator?

Description : Why is a rubber band a insulator?

Last Answer : They are good insulators

How To Make A Rubber Band Gun

Description : How To Make A Rubber Band Gun

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Give reason: Steam exerts great pressure on the walls of the piston during expansion stroke.

Description : Give reason: Steam exerts great pressure on the walls of the piston during expansion stroke.

Last Answer : As steam occupies much larger volume than the same amount of water, it exerts great pressure on the walls of the piston.

How can I be more accepting of people who have stretched ears?

Description : How can I be more accepting of people who have stretched ears?

Last Answer : You could watch plenty of Star Trek episodes. I’m not kidding. Once exposed to dozens of weird humanoid races, certain variations of the looks of Earth’s human beings will be seen as rather minor. This will change your attitude.

Grow old and look old or(finance allowing)have surgery and risk looking like a stretched polythene bag?

Description : Grow old and look old or(finance allowing)have surgery and risk looking like a stretched polythene bag?

Last Answer : I’m okay with aging. My mother has aged beautifully. But, at the same time, she’s a bigger woman and they say the more plump you are the healthier you look as you age aka skinny old people look like skeletons. So, I’ll probably have to gain some weight when I’m older haha.

The springs A and B are identical except that A is stiffer than B, that is KA > kB. If both the springs are stretched by the same amount a.more work will be expended on A than B b.same work will be expended in both springs. c.less work will be expended on A than B d.107 dynes e.

Description : The springs A and B are identical except that A is stiffer than B, that is KA > kB. If both the springs are stretched by the same amount a.more work will be expended on A than B b.same work will be expended in both springs. c.less work will be expended on A than B d.107 dynes e.

Last Answer : a. more work will be expended on A than B

heat In application Most More Stretched Is Which one ?

Last Answer : gaseous Substance Heat In application Most More Stretched Is

In the Argand plane, the vector z = 4 - 3i is turned in the clockwise sense through 180^@` and stretched three times. The complex number represented n

Description : In the Argand plane, the vector z = 4 - 3i is turned in the clockwise sense through 180^@` and stretched three times. The complex number represented n

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A telephone wire 125m long and 1mm in radius is stretched to a length 125.25m when a force of 800N is applied.

Description : A telephone wire 125m long and 1mm in radius is stretched to a length 125.25m when a force of 800N is applied.

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A steel wire having cross sectional area 1.2 mm is stretched by a force of 120 N.

Description : A steel wire having cross sectional area 1.2 mm is stretched by a force of 120 N.

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