A piston filled with 0.04 mol of an ideal gas expands reversibly from 50.0 mL to 375 mL at a constant temperature of 3 7 . 0 ∘ C . As it does so, it absorbs 208 J of heat. The values of q and w for the process will be (R = 8.314 J/mol K) (ln7.5 = 2.01)

q = + 2 0 8 J , w ⁡ = - 2 0 8 J

q = + 2 0 8 J , w ⁡ = + 2 0 8 J

q = - 2 0 8 J , w ⁡ = - 2 0 8 J

MEDIUM

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If you are chilly outside the shower stall, why do you feel warm after bath if you stay in the bathroom?

Important Questions on Natural Resources

MEDIUM

Science>Biology>Natural Resources>Biogeochemical Cycles

The combination of plots which does not represent isothermal expansion of an ideal gas is

$(A)$ Question Image

$(B)$

$(C)$

$(D)$

EASY

Science>Biology>Natural Resources>Biogeochemical Cycles

A piece of ice falls from a height

h

so that it melts completely. Only one-quarter of the heat produced is absorbed by the ice and all energy of ice gets converted into heat during its fall. The value of

h

is:
(Latent heat of ice is

3.4 \times 10^{5} {J kg}^{- 1}

and

g = 10 {N kg}^{- 1}

)

HARD

Science>Biology>Natural Resources>Biogeochemical Cycles

An ideal gas undergoes isothermal compression from

5 m^{3}

1 m^{3}

against a constant external pressure of

4 N m^{- 2}

. The heat released in this process is

24 J {mol}^{- 1} K^{- 1}

and is used to increase the pressure of

1

mole of

Al

. The temperature of

Al

increases by:

MEDIUM

Science>Biology>Natural Resources>Biogeochemical Cycles

A piston filled with 0.04 mol of an ideal gas expands reversibly from 50.0 mL to 375 mL at a constant temperature of

37 . 0^{\circ} C

. As it does so, it absorbs 208 J of heat. The values of q and w for the process will be
(R = 8.314 J/mol K) (ln7.5 = 2.01)

MEDIUM

Science>Biology>Natural Resources>Biogeochemical Cycles

Read the following and select the correct option.
Statement (a) : When we pour little petrol on our palm, it causes the palm to feel cool.
Reason (b) : Particles of petrol evaporate using the energy from our palm which causes the palm to feel cool.

HARD

Science>Biology>Natural Resources>Biogeochemical Cycles

The above

P - V

diagram represents the thermodynamic cycle of an engine, operating with an ideal mono-atomic gas. The amount of heat, extracted from the source in a single cycle, is:

MEDIUM

Science>Biology>Natural Resources>Biogeochemical Cycles

The qualitative sketches I, II and III given below show the variation of surface tension with molar concentration of three different aqueous solutions of KCl,

C H_{3} O H

and

C H_{3} {(C H_{2})}_{11} O S O_{3}^{-} N a^{+}

at room temperature. The correct assignment of the sketches is -

Question Image

MEDIUM

Science>Biology>Natural Resources>Biogeochemical Cycles

X g

of ice at

0^{o} C

is added to 340g of water at

20^{o} C

. The final temperature of the resultant mixture is

5^{o} C

. The value of

X

(in g) is closest to

[Heat of fusion of ice

= 333 J / g

; Specific heat of water

= 4.184 J / g . K

]

EASY

Science>Biology>Natural Resources>Biogeochemical Cycles

Among the following gases, the order of liquefiability is
a) ${SO}_{2}$
b) ${CO}_{2}$
c) ${CH}_{4}$
d) ${NH}_{3}$

EASY

Science>Biology>Natural Resources>Biogeochemical Cycles

Which of the following gases can be absorbed in more proportion?

MEDIUM

Science>Biology>Natural Resources>Biogeochemical Cycles

A system consisting of 1 mol of an ideal gas undergoes a reversible process,

A \to B \to C \to A

(schematically indicated in the figure below). If the temperature at the starting point A is 300 K and the work done in the process

B \to C

is 1 L atm, the heat exchanged in the entire process in L atm is

Question Image

EASY

Science>Biology>Natural Resources>Biogeochemical Cycles

A person takes hot coffee by pouring it into the saucer when he is in a hurry because he knows that:

EASY

Science>Biology>Natural Resources>Biogeochemical Cycles

The work done during combustion of

9 \times 10^{- 2}

kg

of ethane,

C_{2} H_{6} (g)

300 K

is (Given

R = 8 .314 {JK}^{- 1} {mol}^{- 1}

, atomic mass

C = 12, H = 1

)

HARD

Science>Biology>Natural Resources>Biogeochemical Cycles

A reversible cyclic process for an ideal gas is shown below. Here,

P, V, a n d T

are pressure, volume and temperature, respectively. The thermodynamic parameters

q, w, H a n d U

are heat, work, enthalpy and internal energy, respectively.

Question Image

The correct option(s) is (are)

EASY

Science>Biology>Natural Resources>Biogeochemical Cycles

Calculate the work done during compression of

2

mol of an ideal gas from a volume of

1 m^{3}

10

{dm}^{3}

300 K

against a pressure of

100 kPa

EASY

Science>Biology>Natural Resources>Biogeochemical Cycles

An ideal gas undergoes isothermal expansion at constant pressure. During the process:

EASY

Science>Biology>Natural Resources>Biogeochemical Cycles

A gas undergoes change from state

A

to state

B

. In this process, the heat absorbed and work done by the gas is

5 J and 8 J

, respectively. Now gas is brought back to

A

by another process during which

3 J

of heat is evolved. In this reverse process of

B to A

MEDIUM

Science>Biology>Natural Resources>Biogeochemical Cycles

Given, van der Waal's constant for

{NH}_{3}, H_{2}, O_{2}

and

{CO}_{2}

are respectively

4.17, 0.244, 1.36 and 3.59

. Which one of the following gases is most easily liquefied?

EASY

Science>Biology>Natural Resources>Biogeochemical Cycles

Let T = Temperature; H = Humidity and v = Wind speed
Which of the following are the best suited conditions for drying up of clothes?

EASY

Science>Biology>Natural Resources>Biogeochemical Cycles

The water kept in an earthen pot(matka) become cool during summer by which process?

If you are chilly outside the shower stall, why do you feel warm after bath if you stay in the bathroom?

Important Questions on Natural Resources

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