IIT-JEE Practise paper-5 [Test]

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Muggu

IIT-JEE Practise paper-5

A test by Muggu.

Test Questions

Question

After np orbital are filled, the next orbital filled will be :

Answers

Correct	Answer Text
	(n+1)s
	(n+2)s
	(n+2)p
	(n+1)d

Question

The number of spherical nodes in 3p orbitals is :

Answers

Correct	Answer Text
	Three
	Zero
	One
	Two

Question

The equilibrium constant of a reaction is indepedent of temparature. This implies that

Answers

Correct	Answer Text
	Ea of forward reaction is more then that of backward reaction
	$\Delta n_g = 0$ , for reaction
	Ea of forward reaction is qual to that of backward reaction
	Ea of forward reaction is less then that of backward reaction

Question

To produce phosgene gas, Cl_2 and CO are introduced in a reaction vessel in equal molar amount and left at a specific temperatire until equilibrium is reached as

$CO+Cl_2 \rightleftharpoons COCl_2$

If the experiment carried out in 500 ml flask, an analysis of the equilibrium mixture revealed that there were 0.3 mole of COCl_2 , 0.1 mole of CO and 0.1 mole of

The eq. constant is :

Answers

Correct	Answer Text
	30
	15
	5
	3

Question

Answer the following 4 questions on the basis of the given blow paragraph.

The emission of electrons from a metal surface when exposed to light radiations of appropriate wavelength is called photoelectric effect. The emitted electrons are called photoelectrons. Work function or threshold energy may be defined as the minimum amount of energy required to eject electrons from a metal surface. According to Einstein: Maximum kinetic energy of ejected electron = absorbed energy–work function

$\frac {1}{2}mv_{max}^2=h(V)-h(V_0)$

$=hc \bigg[\frac{1}{\lambda} -\frac{1}{\lambda_0} \bigg ]$

where, V_0 and $\lambda_0$ are threshold frequency and threshold wavelength. Stopping potential: It is the minimum potential at which the photoelectric current becomes zero. If V is the stopping potential, then

In the photoelectric effect, the slope of straight line graph between stopping potential (V_0 ) and frequency of incident light (V) gives;

Answers

Correct	Answer Text
	charge on electron
	ratio of Planck’s constant to charge on electron
	work function of emitter
	Planck’s constant

Question

The stopping potential as a function of frequency is plotted for two different photoelectric surface A and B. The graph shows that the work function of A is

Answers

Correct	Answer Text
	grater than that of B
	grater than that of B
	smaller than that of B
	such that no comparison can be done from given

Question

Which of the following is the graph between the frequency (V) of the incident radiations and the stopping potential?

Answers

Correct	Answer Text

Question

The following figure indicates the energy levels of a certain atom. When the system moves from 2E level to E, a photon of wavelength $\lambda$ is emitted. The wavelength of photon produced during the transition from level 4E/3 to level E is

Answers

Correct	Answer Text
	$\lambda /3$
	$3\lambda$
	$4\lambda /4$
	$4\lambda /3$

Question

Answer the following 2 questions on the basis of the given below paragraph.

In each of the following question, 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 answer as;

Assertion : The transition of electrons $n_3 \rightarrow n_2$ n H-atom will emit radiation of higher frequency than $n_4 \rightarrow n_3$ .
Reason : Principal shells n_2

and math>n_3 have lower energy than n_4

Answers

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

Question

Assertion : For maximum stability N/P ratio must be equal to 1.
Reason : Loss of $\alpha$ and $\beta$ -partices has no role in N/P ratio.

Answers

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