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Collect and paste the available pictures of matter

Important Questions on Matter is Everywhere

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Environmental Studies>Exploring the World>Matter is Everywhere>What is Matter

A unit cell of calcium fluoride has four calcium ions. The number of fluoride ions in the unit cell is

HARD

Environmental Studies>Exploring the World>Matter is Everywhere>What is Matter

In a Davisson-Germer experiment, Helium atoms were used in place of electrons. What should be the energy of Helium so that a strong peak of scattered He appears at an angle of

50 °,

as was the case with electrons having an energy of

54 eV ?

(Take mass of

He

atoms to be

7500

times the mass of electrons)

EASY

Environmental Studies>Exploring the World>Matter is Everywhere>What is Matter

In calcium fluoride, having the fluorite structure, the coordination numbers for calcium ion

(C a^{2 +})

and fluoride ion

(F^{-})

are

MEDIUM

Environmental Studies>Exploring the World>Matter is Everywhere>What is Matter

The contribution to the total current in a semiconductor, due to electrons and holes are

0.75

and

0.25

respectively. The drift velocity of electrons is

\frac{3}{2}

times that of holes at this temperature. Then the ratio between electron concentration and hole concentration is

MEDIUM

Environmental Studies>Exploring the World>Matter is Everywhere>What is Matter

The units of surface tension and viscosity of a liquid, respectively, are

EASY

Environmental Studies>Exploring the World>Matter is Everywhere>What is Matter

The barrier potential of a p-n junction depends on:

(a)

type of semi-conductor material

(b)

amount of doping

(c)

temperature
Which one of the following is correct?

HARD

Environmental Studies>Exploring the World>Matter is Everywhere>What is Matter

Consider an ionic solid

MX

, with

NaCl

structure. Construct a new structure

(Z)

, whose unit cell is constructed from the unit cell of

MX

, following the sequential instructions given below. Neglect the charge balance.

(i)

Remove all the anions

(X)

, except the central one.

(ii)

Replace all the face centered cations

(M)

, by anions

(X)

(iii)

Remove all the corner cations

(M)

(iv)

Replace the central anion

(X)

, with cation

(M)

.

The value of

(\frac{n u m b e r o f a n i o n s}{n u m b e r o f c a t i o n s})

Z

is _____.

EASY

Environmental Studies>Exploring the World>Matter is Everywhere>What is Matter

In the following circuit diagram, the current through the battery is

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Environmental Studies>Exploring the World>Matter is Everywhere>What is Matter

Based on the given figure, the number of correct statement/s is/are

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A. Surface tension is the outcome of equal attractive and repulsion forces acting on the liquid molecule in bulk.

B. Surface tension is due to uneven forces acting on the molecules present on the surface.

C. The molecule in the bulk can never come to the liquid surface.

D. The molecules on the surface are responsible for vapour pressure if the system is a closed system.

EASY

Environmental Studies>Exploring the World>Matter is Everywhere>What is Matter

The mass number and the volume of a nucleus is

M

and

V

respectively. If the mass number is increased to

2 M

then the volume is changed to

HARD

Environmental Studies>Exploring the World>Matter is Everywhere>What is Matter

The cubic unit cell structure of a compound containing cation $M$ and anion $X$ is shown below. When compared to the anion, the cation has smaller ionic radius. Choose the correct statement(s).

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HARD

Environmental Studies>Exploring the World>Matter is Everywhere>What is Matter

A graph of vapour pressure and temperature for three different liquids

X, Y

and

Z

is shown below:
Question Image

The following inferences are made:

(A) X

has higher intermolecular interactions compared to

Y .

(B) X

has lower intermolecular interactions compared to

Y .

(C) Z

has lower intermolecular interactions compared to

Y .

The correct inferences is/are:

EASY

Environmental Studies>Exploring the World>Matter is Everywhere>What is Matter

An intrinsic semiconductor is converted into

n

-type extrinsic semiconductor by doping it with:-

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Environmental Studies>Exploring the World>Matter is Everywhere>What is Matter

The radius of

K^{+}

133 pm

and that of

{Cl}^{-}

181 pm

. The volume of the unit cell of

KCl

expressed in

10^{- 22} {cm}^{3}

is:

EASY

Environmental Studies>Exploring the World>Matter is Everywhere>What is Matter

Among the following, which have highest melting point?

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Environmental Studies>Exploring the World>Matter is Everywhere>What is Matter

Silicon doped with gallium forms

EASY

Environmental Studies>Exploring the World>Matter is Everywhere>What is Matter

Glass is

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Environmental Studies>Exploring the World>Matter is Everywhere>What is Matter

The graph of

\ln (\frac{R}{R_{0}})

versus

\ln A

(

R =

radius of a nucleus and

A =

mass number) is

MEDIUM

Environmental Studies>Exploring the World>Matter is Everywhere>What is Matter

A liquid does not wet the solid surface if angle of contact is:

MEDIUM

Environmental Studies>Exploring the World>Matter is Everywhere>What is Matter

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 -

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Important Questions on Matter is Everywhere

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