A person living in Shimla observed that cooking food without using a pressure cooker takes more time. The reason for this observation is-

1. Pressure increases

2. Temperature decreases

3. Pressure decreases

4. Temperature increases

Subtopic:  Gas Laws |
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The spherical shape of rain droplets is due to-

1. Viscosity

2. surface tension

3. Critical phenomenon

4. Pressure

Subtopic:  Liquefaction of Gases & Liquid |
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A plot of volume versus temperature (T) for a gas at constant pressure is a straight line passing through the origin. The plots at different values of pressure are shown in the figure given below.

       

The correct order of pressure is -

         Temperature (K) 

1. p1>p2>p3>p4

2. p1=p2=p3=p4

3. p1<p2<p3<p4

4. p1<p2=p3<p4

Subtopic:  Gas Laws |
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The interaction energy of London force is inversely proportional to sixth power of the distance between two interacting particles. Their magnitude depends upon-

1. Charge of interacting particles.

2. Mass of interacting particles.

3. Polarizability of interacting particles.

4. Strength of permanent dipoles in the particles.

Subtopic:  Introduction to States of Matter |
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Dipole-dipole forces act between the molecules possessing permanent dipole. Ends of dipoles possess 'partial charges'.

The partial charge will be-

1. More than unit electronic charge.

2. Equal to unit electronic charge.

3. Less than unit electronic charge.

4. Double the unit electronic charge.

Subtopic:  Introduction to States of Matter |
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The pressure of a 1 : 4 mixture of dihydrogen and dioxygen enclosed in a vessel is one atmosphere. The partial pressure of dioxygen is-

1. 0.8×105 atm

2. 0.008 Nm-2

3. 8×104 Nm-2

4. 0.25 atm

Subtopic:  Dalton's Law |
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As the temperature increases, average kinetic energy of molecules increases. With increase in temperature at constant volume, the pressure -  

1. Increases

2. Decreases

3. Remains same

4. Becomes half

Subtopic:  Gas Laws |
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Gases possess characteristic critical temperature which depends upon the magnitude of intermolecular forces between the particles. Following are the critical temperatures of some gases.

Gases H2 He O2 N2
The critical temperature in Kelvin 33.2 5.3 154.3 126

From the above data, the order of liquefaction of the given gases is-
(write the order from the gas liquefying first)
1. H2, He, O2, N2
2. He, O2, H2, N2
3. N2, O2, He, H2
4. O2, N2, H2, He

Subtopic:  Liquefaction of Gases & Liquid |
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The SI unit of viscosity coefficient (η) is-

1. Pascal

2. Nsm-2

3. km-2s

4. Nm-2

Subtopic:  Liquefaction of Gases & Liquid |
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Atmospheric pressure recorded in different cities are as follows

Cities p in N/m2
Shimla 1.01×105
Bangalore 1.2×105
Delhi 1.02×105
Mumbai 1.21×105

The liquid will boil first at -

1. Shimla

2. Bangalore

3. Delhi

4. Mumbai

Subtopic:  Liquefaction of Gases & Liquid |
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