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JEE Main Class XII Weekly Mock 13

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Question 1

A cyclotron is used to accelerate

Question 2

An α-particles of energy 5 MeV is scattered through 180 º by gold nucleus. The distance of closest approach is of the order of

Question 3

The thermonuclear reaction of hydrogen inside the stars is taking place by a cycle of operations. The particular element which acts as a catclyst is

Question 4

The half life of a radioactive isotope ‘X’ is 20 years. It decays to another element ‘Y’ which is stable. The two elements ‘X’ and ‘Y’ were found to be in the ratio 1 : 7 in a sample of a given rock. The age of the rock is estimated to be :

Question 5

A radioactive element ₉₀X²³⁸ decay into ₈₃Y²²². The number of

-particles emitted are

Question 6

If a plane passing through the point (2, 2, 1) and is perpendicular to the planes 3x + 2y + 4z + 1 = 0 and 2x + y +3z + 2 = 0. Then, the equation of the plane is

Question 7

If a plane meet the coordinate axes at A, B and C such that the centroid of the triangle is (1,2,4) then the equation of the plane is

Question 8

The volume of the tetrahedron included between the plane 3x +4y -5z-60=0 and the coordinate plances is

Question 9

Lines are coplanar if

Question 10

If the vertices of a triangle are A (0,4,1), B(2,3,-1) and C(4,5,0), then the orthocentre of ΔABC, is

Question 11

The boiling point of ethanol is higher is compared to the boiling point of diethyl ether though both have the same molecular formula. This is due to

Question 12

The step which never be involved in the dehydration of alcohol is

Question 13

The correct order of bond length is

Question 14

Arrange the following compounds in the increasing order of their acidic strength :
(i) m-Nitrophenol
(ii) m-Cresol
(iii) Phenol
(iv) m-Chlorophenol

Question 15

The hydrolysis of optically active 2-bromobutane with aqueous NaOH results in the formation of

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Mar 15JEE & BITSAT