Class-11,Basic concepts of chemistry

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Q1) Chemistry does not play a major role in *

1 point

Large scale production of a variety of fertilizers

Design and synthesis new materials having specific magnetic, electric and optical properties.

Explaining superconductivity

Explaining ozone depletion

Q2) Matter can be classified at the macroscopic or bulk level as *

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Atoms and molecules

Elements and molecules

solids and liquids

mixtures or pure substances

Q3) In a homogeneous mixture,the components are *

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do not mix with each other and its composition is uniform throughout.

do not mix with each other and its composition is not uniform throughout

completely mixed with each other and its composition is uniform through out

completely mix with each other and its composition is not uniform throughout

Q4) Which of the following statements about pure substances is correct ? *

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Pure substances have fixed composition.

Pure substances are elements only.

Pure substances do not have fixed composition .

Pure substances are compounds only

Q5) Particles of compounds are *

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atoms.

heterogeneous mixtures .

homogeneous mixtures .

molecules of two or more atoms of different elements

Q6) Fill up the blank with suitable word in the statement," Physical properties are those properties which are measured or observed--------------- changing the identity or the composition of the substance ." *

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after

without

with

Q7) SI units for Base Physical Quantities of length, mass and current are *

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meter, kilogram, candela

meter, kilogram, ampere

meter, gram, ampere

decimetre, kilogram, ampere

Q8) The kelvin scale is related to celsius scale as : *

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K = °C + 32

K = °C + 273.15

K = °C + 100

K = °C + 212

Q9) Precision and Accuracy refer to _______ of various measurements for the same quantity repeatedly and agreement of a particular value to the ------- -------- of the result , respectively.Amaximum , true value *

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maximum , true value

closeness , other values

minimum , true value

closeness , true value

Q10) WSignificant figures are *

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digits after the decimal point

first three digits after the decimal point

digits before the decimal point

meaningful digits which are known with certainty

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