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JEE Main Class XII Weekly Mock 12

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Question 1

An electron in a hydrogen atom makes a transition from n1 to n2. The time period of the electron in the initial state is eight times that in the final state. The possible value of n1 and n2 are

Question 2


The above is a plot of binding energy per nucleon Eb, against the nuclear mass M; A, B, C, D, E, F correspond to different nuclei. Consider four reactions :
(i) A + B → C + ε
(ii) C → A + B + ε
(iii) D + E → F + ε
(iv) F → D + E + ε
Where ε is the energy released? In which reaction is ε positive?

Question 3

The mass of a neutral carbon atom in ground state is–

Question 4

In the fusion reaction, 1H2 + 1H2 2He3 + 0n1 The masses of deutrons, helium and neutron expressed in amu are 2.015, 3.017 and 1.009 respectively. If 1 kg of deuterium undergoes complete fusion. Find the amount of total energy release, 1 amu = 931 MeV/C2

Question 5

If the binding energy of the electron in a hydrogen atom is 13.6 eV, the energy required to remove the electron from the first excited state of Li++ is

Question 6

2-bromopentane is heated with potassium ethoxide in ethanol. The major product obtained is

Question 7

Acid catalyzed hydration of alkenes except ethene leads to the formation of

Question 8

The reaction of propene with HOCl (Cl2 + H2O) proceeds through the intermediate:

Question 9

Ester A (C4H8O2)+ CH3MgBr C4H10O
(2 parts) (alcohol) (B)
Alcohol B reacts slowly with sodium metal. Hence A and B are

Question 10

Most acidic alcohol among the following is -

Question 11

If direction cosines of a vector of magnitude 3 are Description: E:\KCET-1-Feb\KARNATAKA-PAPER-2015_files\image553.png, then vector is_____

Question 12

Equation of the plane perpendicular to the line Description: Description: image536.png and passing through the point (2, 3, 4) is

Question 13

The angle between the lines whose direction cosines satisfy the equations l + m + n = 0 and l2 = m2 + n2 is

Question 14

If the lines and are coplanar, then k can have

Question 15

The direction cosines of a line equally inclined with the coordinate axes are -
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Mar 28JEE & BITSAT