Question # 1

In proper rotation (Cn) an object is rotated through an angle of.

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a/n radians

2n/n radians

3n/n radians

4n/n radians

How many planes of symmetry are present in benzene.

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1 plane

3 planes

5 planes

7 planes

The entropy of the universe

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Tends towards a maximum

Tend towards a maximum

Tends to be zero

Remains constatn

Which of the following is not a correct postulate of the kinetic theory of gases.

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The molecules are in random motion

The gaseous collisions are perfectly elastic

The average kinetic energies of different gases are equal at a particular temperature.

The pressure exerted on the walls of the container is due to inter molecular forces.

In the process of electrosmosis

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Colloidial particles move towards the electrodes

Both colloidal particles and dis persons medium move

Only dispersion medium moves to carry the current

Positively charged colloidal particles move, but negatively charged particles remain stationary

The angle of rotation in a polarimeter depends on.

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Nature of the compound

Nature of the solvent

Wavelength of the light used

All above factors.

At higher altitudes, the boiling point of water is lowered because.

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Atmospheric pressure is low

Temperature is low at high altitude

Atmospherics pressure increase

None of the above

The possible sub levels in the n = 4 energy level are.

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s,p,d

s,p,d,f

s

s,p

Which of the following statements is not correct regarding the structure of DNA.

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It has a double helix structure.

There are hydrogen bonds in its structure

Unlike RNA there is no fixed ratio of bases in DNA

The code for protein synthesis is given by the sequence of bases in DNA

All cycle engines working reversibly between same temperature of source and sink have the same efficiency This is the statement for the.

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Carnot cycle

Carnot theorem

Narnst theorem

Second law of thermodynamics

In a system , when the chemical potential of each component is the same for all phases. the equilibrium is said to be in

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Metastable equilibrium

Thermal equilibrium

Composition equilibrium

Mechanical equilibrium

The height to which a liquid will rise in an open capillary tube is inversely proportional to.

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Temperature of the liquid

Surface tension

Density of the liquid

Air pressure

The oxidation Number of I in HIO4 is.

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+6

+ 7

+ 3

+ 14

Which of the following molecules has the lowest average speed at 273 K.

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CO2

CO

CH4

O2

Which of the following is a natural polymer

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Nylon

Leucite

Cellulose

Polystyrene

The tyndall effect is not observed in

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Suspensions

Emulsions

Colloidal solutions

True solutions

A system which can exchange energy as well as natter with its surrounding is said to be a/an

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Closed system

Inert system

Open system

All of above

A 10% solution of sucrose contains 10 g of sucrose in how much volume of the solution.

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10 mL

100 mL

1000 mL

1 mL

The photoelectric effect is the ejection pf electrons from the surface of metal when light falls on it. Which of the following statements is not correct about the phenomenon.

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The kinetic energy of photo electron depends upon the frequency of the incident radiation

Electrons are ejected only when the frequency of light exceeds a certain threshold value

The higher the energy of the photon greater the kinetic energy of the ejected electron.

The threshold frequency of all the metals is same.

Which is the following is not a buffer.

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H2CO3/HCO3

NH4Cl/NH4OH

CH3COOH/CH3COONa

NH3OH/CH3COOH

Wlhich of the following can act as a protective colloid

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Gelatin

Silica gel

Oil in water emulsion

All three

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