1
WB JEE 2023
MCQ (More than One Correct Answer)
+2
-0 A balloon starting from rest is ascending from ground with uniform acceleration of 4 ft/sec$$^2$$. At the end of 5 sec, a stone is dropped from it. If T be the time to reach the stone to the ground and H be the height of the balloon when the stone reaches the ground, then

A
T = 6 sec
B
H = 112.5 ft
C
T = 5/2 sec
D
225 ft
2
WB JEE 2023
MCQ (More than One Correct Answer)
+2
-0 If $$f(x) = 3\root 3 \of {{x^2}} - {x^2}$$, then

A
f has no extrema.
B
f is maximum at two points x = 1 and x = $$-$$1.
C
f is minimum at x = 0.
D
f has maximum at x = 1 only.
3
WB JEE 2022
MCQ (More than One Correct Answer)
+2
-0 From a balloon rising vertically with uniform velocity v ft/sec a piece of stone is let go. The height of the balloon above the ground when the stone reaches the ground after 4 sec is [g = 32 ft/sec2]

A
220 ft
B
240 ft
C
256 ft
D
260 ft
4
WB JEE 2021
MCQ (More than One Correct Answer)
+2
-0 The greatest and least value of $$f(x) = {\tan ^{ - 1}} - {1 \over 2}\,ln \,x\,on\,\left[ {{1 \over {\sqrt 3 }},\sqrt 3 } \right]$$ are
A
$${f_{\min }} = \sqrt 3 - 1$$
B
$${f_{\max }} = {\pi \over 6} + {1 \over 4}\ln 3$$
C
$${f_{\min }} = {\pi \over 3} - {1 \over 4}\ln 3$$
D
$${f_{\max }} = {\pi \over {12}} + \ln 5$$
WB JEE Subjects
Physics
Mechanics
Electricity
Optics
Modern Physics
Chemistry
Physical Chemistry
Inorganic Chemistry
Organic Chemistry
Mathematics
Algebra
Trigonometry
Coordinate Geometry
Calculus
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