JEE Main Class XII Weekly Mock 11 for JEE & BITSAT Exams

Question 1

The colour which corresponds to H_B (4 → 2) line in the Balmer series of hydrogen spectra is :

Question 2

In a hypothetical atom like that of hydrogen, the mass of the electrons is doubled. The energy E₀ and radius r₀ of the first Bohr orbit will be (a₀ = Bohr radius of hydrogen)

Question 3

An electron with kinetic energy 5eV is incident on a H-atom in its ground state. The collision:

Question 4

If there is an increase in linear dimensions of the objects, the associated de-Broglie wavelength -

Question 5

Two electrons are moving with the same speed v. One electron enters a region of uniform electric field while the other enters a region of uniform magnetic field. Then after sometime if the de Broglie wavelength of the two are λ₁ and λ₂, then-

Question 6

A hydrocarbon (X) C₆H₁₀ on heating with NaNH₂ followed by acidification gives its isomer (Y). (Y) gives white precipitate with Tollen’s reagent. (X) on ozonolysis gives butanoic acid as one of the product and (X) on reaction with Na in presence of Liq. NH₃ gives another compound (Z). Which of the following statement is correct?

Question 7

Butene-1 may be converted to butane by reaction with

Question 8

Elimination of bromine from 2-bromobutane results in the formation of-

Question 9

Anti-Markownikoff’s addition of HBr is not observed in -

Question 10

Reactivity of alkenes towards HX decreases in the order -

Question 11

A vector

is coplanar with vectors = –

+

and = 2

+

and is orthogonal to the vector . If

. = 7 then the vector

is equal to-

Question 12

If

is a vector whose initial point divides the join of 5

and 5

in the ratio k : 1 and terminal point is origin and |

| ≤, then k lies in the interval -

Question 13

If and are mutually perpendicular vectors, then the projection of the vector

along the angle bisector of the vectors& may be given as

Question 14

Let , and be three non-zero vectors, no two of which are collinear. If the vector 3+ 7 is collinear with and 3+ 2 is collinear with , then 9+ 21+ 14 is equal to -

Question 15

Let = 2

+

, =

+ 2

–

and a unit vector be coplanar. If is perpendicular to , then =