JEE Main Test 109

Result

JEE Main Test 109

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Weekly Quiz Competition

Question 1
4 / -1

Five persons A, B, C, D and E are in queue of a shop. The probability that A and E are always together, is

A
1/4

B
2/3

C
2/5

D
3/5

Solution

Sample space is 5! And favourable number of ways is 2 x 4!
Question 2
4 / -1

If n integers taken at random are multiplied together, then the probability that the last digit of the product is 1, 3, 7 or 9, is

A

B

C

D
None of these

Solution

If the last digit be, 1,3,7, or 9, none of the numbers can be even or end in 0 or 5. Thus we have a choice of 4 digits. i.e, 1, 3, 7, or 9 with each of n numbers should end.
Question 3
4 / -1

Which type of gate the following truth table represents?

A
NOT

B
AND

C
OR

D
NAND

Solution
Question 4
4 / -1

The radius of hydrogen atom in its ground state is 5.3 × 10^-11 m. After collision with an electron it is found to have a radius of 21.2 × 10^-11 m. What is the principal quantum number n of the final state of atom ?

A
n = 4

B
n = 2

C
n = 16

D
n = 3

Solution
Question 5
4 / -1

Continuous emission spectrum is produced by

A
incandescent electric lamp

B
mercury vapour lamp

C
sodium vapour lamp

D
polyatomic substances

Solution

Incandescent electric lamp produces continuous emission. Where as other are produces line emission spectrum last polyatomic produces band absorption spectrum.
Question 6
4 / -1

What is the value of

A
(1001)₂

B
(101)₂

C
(110)₂

D
(100)₂

Solution
Question 7
4 / -1

Different possible thermal decomposition pathways for peroxyesters are shown below. Match each pathway from Column I and select the correct answer using the code given below the lists.

A
P = 1, Q = 3, R = 4, S = 2

B
P = 2, Q = 4, R = 3, S = 1

C
P = 4, Q = 1, R = 2, S = 3

D
P = 3, Q = 2, R = 1, S = 4

Solution
Question 8
4 / -1

In the following reaction,

A

B

C

D

Solution
Question 9
4 / -1

The compound that undergoes decarboxyliation most readily under mild condition is

A

B

C

D

Solution
Question 10
4 / -1

Area included between curves y = x² - 3x + 2 and y = -x² + 3x - 2 is

A
1/6 sq unit

B
1/2 sq unit

C
1 sq unit

D
None of these

Solution