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Question 1

During sedimentation,lighter particles settle down forming sediments​

Accepted Answer

NA

Question 2

The Evolution of the EarthScientists are still debating about how our Earth was formed. Most scientistsare of the view that Earth began to form around four and a half billion years ago.The Earth has reached its present form through several phases. It began as a ball ofswirling dust and clouds, and passed through a molten stage. At that time, the Earthwas very hot and was constantly bombarded by massive rocks and other materialsfrom the space. In this way, the size of the Earth grew. The Earth was so hot that itwas molten (in hot liquid form). If you boil a thick soup containing many substances,you may observe that the heavier particles tend to go to the bottom and lighterparticles come to the top. These lighter particles cool at the top and form a layerof crust (like the cream of milk). Similarly, while heavier substances formed thepart of the molten core, lighter substances rose to the surface and cooled. Slowly,an upper crust of lighter and cooler materials formed covering the molten interior.As the Earth's interior continued to cool, it contracted and the outer crustwrinkled, forming ridges (mountains) and basins (low areas which became oceanslater).The atmosphere of the Earth consisted of different kinds of gases including​

Accepted Answer

NA

Question 3

When the liquid is spun rapidly, the denser particles are forced to the bottom and the lighter particles stay at the top. This principle is used in: *1 pointCentrifugationFractional distillationEvaporationTunneling​

Accepted Answer

NA

Question 4

Bright AcademyUnit Test-2STD: IXSubject: ChemistryTime:Part -A (objective type question)Marks:141X3=3mark1. Identify the heterogeneous mixtures from the following:(a) Air (b) soda water (c) soap solution (d) brass(choose the best answer)2. When a fine beam of light enters in a room through a small hole. This happens due towhat phenomenon?3 The denser particles are forced t the bottom and the lighter particles stay at the topwhen spun rapidly. What is the principle behind this method?t-B (short answers)​

Accepted Answer

NA

Question 5

Write true or false. Correct the false statements. 1. A mixture has a definite set of properties. 2. The constituents of a mixture can be separated by simple physical means. 3. Petroleum is a mixture of groups of compounds such as bitumen, diesel and petroleum gas4. Sieving is a better method of separating bran and wheat flour than winnowing. 5. Lighter particles are separated from heavier particles in a mixture by winnowing. 6. Common salt sublimes on heating whereas ammonium chloride does not. 7. We can get water from a mixture of salt and water by evaporation.​

Accepted Answer

NA

Question 6

Which of the following is true about time of flight analyser spectrometers?

(a) Lighter particles arrive at the detector earlier

(b) Heavier particle arrive at the detector earlier

(c) Lighter and heavier particles arrive together at the detector

(d) Lighter particles do not reach the detector

I have been asked this question in final exam.

This key question is from Time of Flight Mass Spectrometer in chapter Mass Spectrometer of Analytical Instrumentation

Accepted Answer

NA

Question 7

The separation of denser particles from lighter particles done by rotation at high speed is calls _______

Accepted Answer

NA

Question 8

The French physicist Louis de Broglie in 1924 postulated that matter , like radiation , should exhibit dual behaviour. He proposed the following relationship between the wavelenght lambda of a material particle , its linear momentum p and planck cosntant h.
`lambda= (h)/(p)=(h)/(mv)`
The de Broglie relation implies that the wavelength of a partices should decreases as its velocity increases. It also implies that the for a given velocity heavir particule should have shorter wavelenght than lighter particles. The waves associated with particles in motin are called matter waves or de Broglie waves.
These waves differ from the electromagnetic waves as they
(i) have lower velocities
have no electrical and magnetic fields and
are not emitted by the particle under consideration.
The experimental confirmation of the de Broglie relation was obtained when Davisson and Germer. in
1927, observed that a beam of electrons is diffracted by a nickel arystal. As diffarceted by a nickel . As diffraction is a characteristic
property of waves, hence the beam of electron dehaves as a wave, as proposed by de Broglie.
Werner Heisenberg cobnsiderd the imits of how precisely we can measure propoerties of an electron or
other microscopic particle like electron. he determined that there is accurately we measure the momentum of a
particle, the less accurately we can determine its position . The converse is laso true . The is summed up
in what we now call the "Hesienberg uncertainty princple: It isimpossibble to determine simultameously ltbr. and percisely both the momentum ans position of particle . The product of uncertainly in the position,
Deltax and the ncertainly in the momentum Delta(mv) mudt be greater than or equal to `(h)/(4pi)` i.e.
`etaDeltax Delta(mv)ge(h)/(4pi)`
The correct order of wavelenght of Hydrogen `(._(1)H^(1))` Deuterium `(._(1)H^(2))` and Tritium `(._(1)H^(3))` moving withsame kinetic energy is.
A. `lambda_(H)gtlambda_(D)gtlambda_(T)`
B. `lambda_(H)=lambda_(D)=lambda_(T)`
C. `lambda_(H)ltlambda_(D)ltlambda_(T)`
D. `lambda_(H)ltlambda_(D)gtlambda_(T)`

Accepted Answer

NA

Question 9

The French physicist Louis de Broglie in 1924 postulated that matter like radiation , should exhibit a dual behaviour. He proposed the following relationship between the wavelength `.lambda` of a material particle,its linear momentum P and Planck constant h.
`lambda=(h)/(p)=(h)/(mv)`
The de Broglie relaion that the wavelength of a particle should decrease as its velocity increases. It also implies that for a given velocity heavier particles should have shorter wavelength than lighter particles.The waves or de Broglie waves. These waves differ from the electromagnetic waves as they:
(i) have lower velocities
(ii) have no electrical and magnetic fields and
(iii) are not emitted by the particle under consideration.
The expermental confirmation of the de Broglie relation was obtained when Davission and Germer in 1927, observed. As diffraction is a characteristic property of waves, hence the beam of electrons behave as a wave as proposed by de Broglie.
Werner Heisenberg considered the limits of how precisely we can measure properties of an electron or other microscopic particle like electron . He determined that there is a fundamental limit of how closely we can measure both position and momentum. The more accurately we can determine its position. The converse is also true. This is summed up in what we now call the 'Heisenberg uncertainty principle' : It is impossible to determine simultaneously and precisely both the momentum and position of a particle. The product of uncertainty in the position, `Deltax` and the uncertainty in the momentum `Delta(mv)` must be greater than or equal to `(h)/(4pi), i.e.,`
`Deltax Delta(mv)ge(h)/(4pi)`
The correct order of wavelength of Hydrogen `(._(1)H^(1))` Deuterium `(._(1)H^(2))` and Tritium `(._(1)H^(3))` moving with same kinetic energy is :
A. `lambda_(H)gtlambda_(D)gtlambda_(T)`
B. `lambda_(H)=lambda_(D)=lambda_(T)`
C. `lambda_(H)ltlambda_(D)ltlambda_(T)`
D. `lambda_(H)ltlambda_(D)gtlambda_(T)`

Accepted Answer

NA

Question 10

The French physicist Louis de Broglie in 1924 postulated that matter like radiation , should exhibit a dual behaviour. He proposed the following relationship between the wavelength `.lambda` of a material particle,its linear momentum P and Planck constant h.
`lambda=(h)/(p)=(h)/(mv)`
The de Broglie relaion that the wavelength of a particle should decrease as its velocity increases. It also implies that for a given velocity heavier particles should have shorter wavelength than lighter particles.The waves or de Broglie waves. These waves differ from the electromagnetic waves as they:
(i) have lower velocities
(ii) have no electrical and magnetic fields and
(iii) are not emitted by the particle under consideration.
The expermental confirmation of the de Broglie relation was obtained when Davission and Germer in 1927, observed. As diffraction is a characteristic property of waves, hence the beam of electrons behave as a wave as proposed by de Broglie.
Werner Heisenberg considered the limits of how precisely we can measure properties of an electron or other microscopic particle like electron . He determined that there is a fundamental limit of how closely we can measure both position and momentum. The more accurately we can determine its position. The converse is also true. This is summed up in what we now call the 'Heisenberg uncertainty principle' : It is impossible to determine simultaneously and precisely both the momentum and position of a particle. The product of uncertainty in the position, `Deltax` and the uncertainty in the momentum `Delta(mv)` must be greater than or equal to `(h)/(4pi), i.e.,`
`Deltax Delta(mv)ge(h)/(4pi)`
The transition so that the de Broglie wavelength of electron becomes 3 times of its initial value in `He^(+)` ion will be :
A. `2 to 5`
B. `3 to 2`
C. `2 to 6`
D. `1 to 2`

Accepted Answer

NA

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