1
WB JEE 2019
+1
-0.25 If the radius of a spherical balloon increases by 0.1%, then its volume increases approximately by
A
0.2%
B
0.3%
C
0.4%
D
0.05%
2
WB JEE 2018
+1
-0.25 The law of motion of a body moving along a straight line is x = $${1 \over 2}$$ vt. x being its distance from a fixed point on the line at time t and v is its velocity there. Then
A
acceleration f varies directly with x
B
acceleration f varies inversely with x
C
acceleration f is constant
D
acceleration f varies directly with t
3
WB JEE 2018
+2
-0.5 A ladder 20 ft long leans against a vertical wall. The top end slides downwards at the rate of 2 ft per second. The rate at which the lower end moves on a horizontal floor when it is 12 ft from the wall is
A
$${{ - 8} \over 3}$$
B
$${6 \over 5}$$
C
$${3 \over 2}$$
D
$${17 \over 4}$$
4
WB JEE 2018
+2
-0.5 The normal to the curve $$y = {x^2} - x + 1$$, drawn at the points with the abscissa $${x_1} = 0$$, $${x_2} = - 1$$ and $${x_3} = {5 \over 2}$$
A
are parallel to each other
B
are pairwise perpendicular
C
are concurrent
D
are not concurrent
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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