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JEE Advanced Test- 12 - JEE MCQ


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30 Questions MCQ Test Mock Tests for JEE Main and Advanced 2025 - JEE Advanced Test- 12

JEE Advanced Test- 12 for JEE 2024 is part of Mock Tests for JEE Main and Advanced 2025 preparation. The JEE Advanced Test- 12 questions and answers have been prepared according to the JEE exam syllabus.The JEE Advanced Test- 12 MCQs are made for JEE 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for JEE Advanced Test- 12 below.
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JEE Advanced Test- 12 - Question 1

A cobalt (atomic no. = 27) target is bombarded with electrons, and the wavelengths of its characteristic x-ray spectrum are measured. A second weak characteristic spectrum is also found, due to an impurity in the target. The wavelengths of the Kα lines are 225.0 pm (cobalt) and 100.0 pm (impurity).  Atomic number of the impurity is (take b = 1)

Detailed Solution for JEE Advanced Test- 12 - Question 1

JEE Advanced Test- 12 - Question 2

A hydrogen atom is in the 4th excited state, then:

Detailed Solution for JEE Advanced Test- 12 - Question 2

The hydrogen atom is in n = 5 state.
   Max. no of possible photons = 4
To emit photon in ultra violet region, it must jump to n = 1, because only Lyman series lies in u.v. region. Once
it jumps to n = 1 photon, it reaches to its ground state and no more photons can be emitted. So only one photon
in u. v. range can be emitted.
If H atom emits a photon and then another photon of Balmer series, option D will be correct.

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JEE Advanced Test- 12 - Question 3

In the photoelectric experiment, if we use a monochromatic light, the I - V curve is as shown. If work function of the metal is 2eV, estimate the power of light used. (Assume efficiency of photo emission = 10–3%, i.e. number of photoelectrons emitted are 10–3% of number of photons incident on metal.)

Detailed Solution for JEE Advanced Test- 12 - Question 3

JEE Advanced Test- 12 - Question 4

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason(R) just below it.Read the Statement carefully and mark the correct answer-
Assertion(A): Protostele is the simplest type of stele.
Reason (R): Siphonostele has pith in the centre.

JEE Advanced Test- 12 - Question 5

Detailed Solution for JEE Advanced Test- 12 - Question 5

JEE Advanced Test- 12 - Question 6

A 10 μ F capacitor and a 20 μ F capacitor are connected in series across 200 V supply line. The charged capacitors are then disconnected from the line and reconnected with their positive plates together and negative plates together and no external voltage is applied. What is the potential difference across each capacitor?

JEE Advanced Test- 12 - Question 7

A metallic charged ring is placed in a uniform magnetic field with its plane perpendicular to the field. If the magnitude of field starts increasing with time, then :  

Detailed Solution for JEE Advanced Test- 12 - Question 7

JEE Advanced Test- 12 - Question 8

An electron in hydrogen atom makes a transition n1 → n2 where n1 and n2 are principal quantum numbers of the two states. Assuming Bohr's model to be valid the time period of the electron in the initial state is eight times that in the final state. The possible values of n1 and n2 are

*Multiple options can be correct
JEE Advanced Test- 12 - Question 9

The decay constant of a radio active substance is 0.173 (years)-1. Therefore : 

Detailed Solution for JEE Advanced Test- 12 - Question 9

*Multiple options can be correct
JEE Advanced Test- 12 - Question 10

In an x-ray tube the voltage applied is 20 kV. The energy required to remove an electron from L shell is 19.9 keV. In the x-rays emitted by the tube (Use hc = 12420 eVÅ)

Detailed Solution for JEE Advanced Test- 12 - Question 10

*Multiple options can be correct
JEE Advanced Test- 12 - Question 11

When a hydrogen atom  is excited from ground  state to first excited state then    

Detailed Solution for JEE Advanced Test- 12 - Question 11

JEE Advanced Test- 12 - Question 12

Consider the following four electrodes,

P = Cu2+ (0.0001 M) | Cu(s)

Q = Cu2+ (0.1 M) | Cu(s)

R = Cu2+ (0.01 M) | Cu(s)

S = Cu2+ (0.001 M) | Cu(s)

If the standard reduction potential of Cu2+/Cu is +0.34 V, the reduction potentials in volts of the above electrodes follow the order

JEE Advanced Test- 12 - Question 13

Statement-1 : In process of photoelectric emission, all emitted electrons donot have same kinetic energy.

Statement-2 : If radiation falling on photosensitive surface of a metal consists of different wavelengths, then energy acquired by electrons absorbing photons of different wavelengths shall be different.

Detailed Solution for JEE Advanced Test- 12 - Question 13

Both statements I and II are true; but even if radiation of single wavelength is incident on photosensitive surface, electrons of different KE will be emitted.

JEE Advanced Test- 12 - Question 14

Statement-1 : When a beam of highly energetic neutrons is incident on a tungsten target, no X-rays will be produced.

Statement-2 : Neutrons do not exert any electrostatic force on electrons or nucleus of an atom.

Detailed Solution for JEE Advanced Test- 12 - Question 14

Neutron will knock out electrons in target leading to production of characteristic X-ray. Hence statement-1 is false.

JEE Advanced Test- 12 - Question 15

Statement-1 : When cathode rays (accelerated with high voltage 10 kVolts) strikes a hard metallic surface, highly penetrating radiation is obtained.

Statement-2 : Due to conversion of electron's kinetic energy into photon's energy, the shortest wavelength limit of X-rays produced is inversely proportional to the accelerating voltage.

Detailed Solution for JEE Advanced Test- 12 - Question 15

JEE Advanced Test- 12 - Question 16

Statement-1 : Heavy nuclides tend to have more number of neutrons than protons.

Statement-2 : In heavy nuclei, as there is coloumbic repulsion between protons, so excess of neutrons are preferable.

Detailed Solution for JEE Advanced Test- 12 - Question 16

Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1

JEE Advanced Test- 12 - Question 17

An experimental setup of verification of photoelectric effect is shown in the diagram. The voltage across the electrodes is measured with the help of an ideal voltmeter and which can be varied by moving jockey ‘J’ on the potentiometer wire. The battery used in potentiometer circuit is of 20 V and its internal resistance is 2?. The resistance of 100 cm long potentiometer wire is 8?.

The photocurrent is measured with the help of an ideal ammeter. Two plates of potassium oxide of area 50 cm2 at separation 0.5 mm are used in the vacuum tube. Photo current in the circuit is very small so we can treat potentiometer circuit an independent circuit.

The wavelengths of various colours is as follows : 

Q. The number of electrons appeared on the surface of the cathode plate, when the jockey is connected at the end ‘P’ of the potentiometer wire. Assume that no radiation is falling on the plates.

Detailed Solution for JEE Advanced Test- 12 - Question 17

JEE Advanced Test- 12 - Question 18

An experimental setup of verification of photoelectric effect is shown in the diagram. The voltage across the electrodes is measured with the help of an ideal voltmeter and which can be varied by moving jockey ‘J’ on the potentiometer wire. The battery used in potentiometer circuit is of 20 V and its internal resistance is 2?. The resistance of 100 cm long potentiometer wire is 8?.

The photocurrent is measured with the help of an ideal ammeter. Two plates of potassium oxide of area 50 cm2 at separation 0.5 mm are used in the vacuum tube. Photo current in the circuit is very small so we can treat potentiometer circuit an independent circuit.

The wavelengths of various colours is as follows : 

Q. It is found that ammeter current remains unchanged (2μA) even when the jockey is moved from the end ‘P’ to the middle point of the potentiometer wire. Assuming all the incident photons eject electron and the power of the light incident is 4 × 10–6 W. Then the colour of the incident light is

Detailed Solution for JEE Advanced Test- 12 - Question 18

JEE Advanced Test- 12 - Question 19

An experimental setup of verification of photoelectric effect is shown in the diagram. The voltage across the electrodes is measured with the help of an ideal voltmeter and which can be varied by moving jockey ‘J’ on the potentiometer wire. The battery used in potentiometer circuit is of 20 V and its internal resistance is 2?. The resistance of 100 cm long potentiometer wire is 8?.

The photocurrent is measured with the help of an ideal ammeter. Two plates of potassium oxide of area 50 cm2 at separation 0.5 mm are used in the vacuum tube. Photo current in the circuit is very small so we can treat potentiometer circuit an independent circuit.

The wavelengths of various colours is as follows : 

Q. When other light falls on the anode plate the ammeter reading remains zero till,  jockey is moved from the end P to the middle point of the wire PQ. Thereafter the deflection is recorded in the ammeter. The maximum kinetic energy of the emitted electron is

Detailed Solution for JEE Advanced Test- 12 - Question 19

JEE Advanced Test- 12 - Question 20

Consider the reaction,

Cl2 (aq) + H2S (aq) → S(s) + 2H+(aq) + 2Cl(aq)

The rate equation for this reaction is, rate = k [Cl2] [H2S]

Which of these mechanisms is/are consistent with this rate equation?

(a).  Cl2 + H2S → H+ + Cl + Cl+ + HS (slow)

     Cl+ + HS → H+ + Cl + S (fast)

(b).  H2 H+ + HS (fast equilibrium)

     Cl2 + HS → 2Cl + H+ + S (slow)

JEE Advanced Test- 12 - Question 21

The half life period of a first order chemical reaction is 6.93 minutes. The time required for the completion of 99% of the chemical reaction will be (log 2 = 0.301)

JEE Advanced Test- 12 - Question 22

Consider a reaction, aG + bH → Products.

When concentration of both the reactants G and H is doubled, the rate increases by eight times. However, when the concentration of G is doubled keeping the concentration of H fixed, the rate is doubled. The overall order of the reaction is:

JEE Advanced Test- 12 - Question 23

Using Bohr’s model for H–like atom, match the following. Here n = orbit number, Z = nuclear charge, m = mass of electron  
            Column-I                                                                              Column-II   
    (A) Due to revolving electron, the magnetic field produced                (p) n–5 
        at its centre is proportional to

    (B) Magnetic moment of revolving electron is proportional to             (q) n

    (C) De-Broglie wave length of revolving electron is proportional to      (r) Z3 

    (D) Areal velocity of revolving electron about nucleus is                    (s) independent of Z
        proportional to 
                                                                                                        (t) m–1 

Detailed Solution for JEE Advanced Test- 12 - Question 23

JEE Advanced Test- 12 - Question 24

For a reaction A + B → C + D if the concentration of A is doubled without altering the concentration of B, the rate gets doubled. If the concentration of B is increased by nine times without altering the concentration of A, the rate gets tripled. The order of the reaction is 

JEE Advanced Test- 12 - Question 25

When a bio chemical reaction is carried out in laboratory out side the human body in the absence of enzyme, then the rate of reaction obtained is 10–6 times, than activation energy of

reaction in the presence of enzyme is:

JEE Advanced Test- 12 - Question 26

'Spin only' magnetic moment of Ni in [Ni(dmg)2] is same as that found in :

Detailed Solution for JEE Advanced Test- 12 - Question 26

JEE Advanced Test- 12 - Question 27

Which of the following complexes shows ionisation as well as hydrate isomerism ?

Detailed Solution for JEE Advanced Test- 12 - Question 27

Both compounds have same formula, but gives different ions in solution, hence exhibit, ionization isomerism. It also shows hydrate isomerism as shown above because hydrate isomers differ by whether or not a water molecule(s) is / are directly bonded to the metal ion or merely present as free water molecule(s) in the crystal lattice.

JEE Advanced Test- 12 - Question 28

Which of  the following statements is true for the compounds [X], [Y] and [Z] ?

Detailed Solution for JEE Advanced Test- 12 - Question 28

JEE Advanced Test- 12 - Question 29

Detailed Solution for JEE Advanced Test- 12 - Question 29

JEE Advanced Test- 12 - Question 30

Maximum number of electrons in a subshell with = 3 and = 4 is 

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