IIT-JEE Practise paper-10 [Test]

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Muggu

IIT-JEE Practise paper-10

A test by Muggu.

Test Questions

Question

The order of increasing energies of the orbitals follows;

Answers

Correct	Answer Text
	3s, 3p, 3d, 4s, 4p
	3s, 3p, 3d, 4p, 4s
	3s, 3p, 4s, 3d, 4p
	3s, 3p, 4s, 4p, 3d

Question

The manganese (Z=25) has the outer configuration;

Answers

Correct	Answer Text

Question

For the reaction at equilibrium:

$CO_2(g) + H_2(g) \leftrightharpoons CO(g) + H_2O(g)$

P=Total pressure

Answers

Correct	Answer Text
	$P \quad co_2 =P\quad _{H2} = [(1-x)/2]. P$
	$P\quad _{H2} =P\quad _{H2O} = (x/2)P$
	$P\quad co =P\quad _{H2} = [(1-x)/2]. P$
	$P\quad co_2 =P\quad _{H2O} = (x/2)P$

Question

A catalyst that increases the rate, is actually a substance that

Answers

Correct	Answer Text
	Increases rate constant of forward reaction without changing the rate constant of backward reaction
	Increases the Ea of the reaction
	Increases rate constant of forward reaction and that of backward reaction in the same proportion
	Increases equilibrium constant of the reaction

Question

Answer the following 4 questions on the basis of given below :

Dual Nature of Matter -

Light and other electromagnetic radiations have dual nature i.e., wave and particle nature. Interference and diffraction phenomenon show the wave nature of light whereas the photoelectric effect and black body radiation phenomenon support the particle nature of light. Louis de Broglie (1924) suggested on the same grounds that all moving material particles (macroscopic well macroscopic) also have the dual nature i.e., wave and particle nature. However, the wave associated with matter, known as matter wave has characteristics different from the electromagnetic wave. The two characters of matter are related by deBroglie equation as;

$\lambda = \frac{h}{mv} =\frac{h}{p}..........(h=Plancks-constant)....(1)$

where $\lambda$ denotes the wavelength associated with the moving matter object of mass m and velocity v and p denotes the momentum the object.
Davisson and Germer determined the wavelength of matter wave associated with electrons (accelerated by a exactly known electrode potential) by studying their diffraction patterns from nickel crystal and using the relation:

$2d \quad sin \theta = n \lambda ..................... (2)$

where 'd' denotes the spacing of lattice planes in nickel crystal, $\theta$ the grazing angle of incidence on the planes and n(1, 2, 3 etc) the order of refletion.
The experimentally determined value of $\lambda$ from Eq. (2) is found to be in excellent agreement with the value of wavelength calculate using de Broglie equation as;

$\lambda = \frac{h}{mv} =\frac{h}{\sqrt{2me V}}$
where ‘e’ is the electronic charge (coulombs) and V (volts) is the acceleration potential.

The momentum of hydrogen atom is given by;

Answers

Correct	Answer Text
	$p = \frac{hv}{c}$
	$p = \frac{mv}{h}$
	Can’t be predicted
	$p = \frac{hv}{mc2}$

Question

The wavelength of matter wave associated with an electron passing through an electric potential of 5000V is given by h = electronic charge in coulombs and m = mass of electron in Kg.

Answers

Correct	Answer Text
	$\frac{h*10^{-2}}{\sqrt{me}} m$
	$\frac{\sqrt{me}}{h}*10^{4} m$
	$\frac{h*10^{-4}}{\sqrt{me}} m$
	$\frac{\sqrt{me}}{h}*10^{-2} m$

Question

If $\lambda$ is the wavelength associated with the electron in the second circular orbit of H–atom, the radius of the orbit is given by;

Answers

Correct	Answer Text
	$\lambda /\pi$
	$\pi/\lambda$
	$\lambda /2\pi$
	$2\pi /\lambda$

Question

If the Planck’s constant is $6.6*10^{-34}$ J.s, the de Broglie wavelength of a particle of mass $3.3*10^{-27}$ Kg and velocity 200 $ms^{-1}$ be;

Answers

Correct	Answer Text
	$10 \overset{0}{A}$
	$20 \overset{0}{A}$
	$5 \overset{0}{A}$
	$2 \overset{0}{A}$

Question

In each of the following 2 questions, a statement of Assertion (A) is given and a corresponding statement of Reason (R) is given just below it. Of the statement, mark the correct aanswer as;

Assertion: Electrons are negatively charged.

Reason: The application of electric and magnetic field deflected the rays in the discharge tube towards the cathode.

Answers

Correct	Answer Text
	both A and R are true and R is the correct explanation of A
	both A and R are true but R is not the correct explanation of A
	A is true but R is false
	A is false but R is true

Question

Assertion: On heating a solid for a longer time, radiations become white and then blue as the temperature becomes very high.

Reason: Radiations emitted go from a lower frequency to higher frequency as the temperature increases.

Answers

Correct	Answer Text
	both A and R are true but R is not the correct explanation of A
	A is true but R is false
	A is false but R is true
	both A and R are true and R is the correct explanation of A