1
WB JEE 2020
MCQ (More than One Correct Answer)
+2
-0
Change Language
A particle is projected vertically upwards. If it has to stay above the ground for 12 sec, then
A
velocity of projection is 192 ft/sec
B
greatest height attained is 600 ft
C
velocity of projection is 196 ft/sec
D
greatest height attained is 576 ft
2
WB JEE 2020
MCQ (More than One Correct Answer)
+2
-0
Change Language
The equation $${x^{{{(\log 3x)}^2}}} - {9 \over 2}\log 3\,x + 5 = 3\sqrt 3 $$ has
A
at least one real root
B
exactly one real root
C
exactly one irrational root
D
complex roots
3
WB JEE 2020
MCQ (More than One Correct Answer)
+2
-0
Change Language
In a certain test, there are n questions. In this test 2n-i students gave wrong answers to at least i questions, where i = 1, 2, ..., n. If the total number of wrong answers given is 2047, then n is equal to
A
10
B
11
C
12
D
13
4
WB JEE 2020
MCQ (More than One Correct Answer)
+2
-0
Change Language
A and B are independent events. The probability that both A and B occur is $${1 \over {20}}$$ and the probability that neither of them occurs is $${3 \over {5}}$$. The probability of occurrence of A is
A
$${1 \over {2}}$$
B
$${1 \over {10}}$$
C
$${1 \over {4}}$$
D
$${1 \over {5}}$$
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