JEE Main Class XII Weekly Mock 16 for JEE & BITSAT Exams

Question 1

The order of melting and boiling points of the primary (1 °), secondary (2 °) and tertiary (3 °) alkyl halides is:

Question 2

Which of these is the correct statement about alkyl halides:

Question 3

Which one of the following reactions can be used for the preparation of ß-hydroxy ester:

Question 4

Sodium benzoate on heating with sodalime gives:

Question 5

Which of the following compounds gives carbon dioxide with NaHCO₃?

Question 6

In a full wave rectifier circuit operating from 50 Hz mains frequency, the fundamental frequency in the ripple would be

Question 7

A p–n junction (4) shown in the figure can act as a rectifier. An alternating current source (V) is connected in the circuit.

The current (I) in the resistor (R) can be shown by :

Question 8

A working transistor with the three legs marked P, Q and R is tested using a multimeter. No conduction is found between P and Q. By connecting the common (negative) terminal of the multimeter to R and the other (positive) terminal to P or Q, some resistance is seen on the multimeter. Which of the following is true for the transistor?

Question 9

In reverse biased p-n junction, the increase in voltage ________ width of depletion region near junction.

Question 10

The barrier potential of a p-n junction depends on :
(a) type of semi conductor material
(b) amount of doping
(c) temperature
Which one of the following is correct?

Question 11

Odds 8 to 5 against a person who is 40 yr old living till he is 70 and 4 to 3 against another person now 50 till he will be living 80. Probability that one of them will be alive next 30 yr.

Question 12

The probabilities that Mr. A and Mr. B will die within a year are

and

respectively, then the probability that only one of them will be alive at the end of the year, is

Question 13

A die is rolled twice and the sum of the numbers appearing on them is observed to be 7. What is the conditional probability that the number 2 has appeared at least once?

Question 14

A man takes a step forward with probability 0.4 and one step backward with probability 0.6, then the probability 0.6, then the probability that the end of eleven steps he is one step away from the starting point, is

Question 15

The probability distribution of x is
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Find the value of k.