1
JEE Main 2019 (Online) 8th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
For the solution of the gases w, x, y and z in water at 298K, the Henrys law constants (KH) are 0.5, 2, 35 and 40 kbar, respectively. The correct plot for the given data is :-
A
JEE Main 2019 (Online) 8th April Evening Slot Chemistry - Solutions Question 98 English Option 1
B
JEE Main 2019 (Online) 8th April Evening Slot Chemistry - Solutions Question 98 English Option 2
C
JEE Main 2019 (Online) 8th April Evening Slot Chemistry - Solutions Question 98 English Option 3
D
JEE Main 2019 (Online) 8th April Evening Slot Chemistry - Solutions Question 98 English Option 4
2
JEE Main 2019 (Online) 8th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The minimum number of times one has to toss a fair coin so that the probability of observing at least one head is at least 90% is :
A
2
B
3
C
4
D
5
3
JEE Main 2019 (Online) 8th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A student scores the following marks in five tests :

45, 54, 41, 57, 43.

His score is not known for the sixth test. If the mean score is 48 in the six tests, then the standard deviation of the marks in six tests is
A
$$100 \over {\sqrt 3}$$
B
$$10 \over {\sqrt 3}$$
C
$$10 \over3$$
D
$$100 \over3$$
4
JEE Main 2019 (Online) 8th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The sum $$\sum\limits_{k = 1}^{20} {k{1 \over {{2^k}}}} $$ is equal to
A
$$2 - {11 \over {{2^{19}}}}$$
B
$$2 - {3 \over {{2^{17}}}}$$
C
$$1 - {11 \over {{2^{20}}}}$$
D
$$2 - {21 \over {{2^{20}}}}$$
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