1
WB JEE 2021
+1
-0.25 Two particles A and B move from rest along a straight line with constant accelerations f and f' respectively. If A takes m sec. more than that of B and describes n units more than that of B in acquiring the same velocity, then
A
$$(f + f'){m^2} = ff'n$$
B
$$(f - ff'){m^2} = ff'n$$
C
$$(f' - f)n = {1 \over 2}ff'{m^2}$$
D
$${1 \over 2}(f + f')m = ff'{n^2}$$
2
WB JEE 2021
+2
-0.5 If the tangent at the point P with co-ordinates (h, k) on the curve y2 = 2x3 is perpendicular to the straight line 4x = 3y, then
A
(h, k) = (0, 0) only
B
(h, k) = $$\left( {{1 \over 8}, - {1 \over {16}}} \right)$$ only
C
(h, k) = (0, 0) or $$\left( {{1 \over 8},{1 \over {16}}} \right)$$
D
no such point P exists
3
WB JEE 2020
+1
-0.25 If the tangent to the curve y2 = x3 at (m2, m3) is also a normal to the curve at (m2, m3), then the value of mM is
A
$$- {1 \over 9}$$
B
$$- {2 \over 9}$$
C
$$- {1 \over 3}$$
D
$$- {4 \over 9}$$
4
WB JEE 2020
+1
-0.25 Let $$f(x) = {x^{13}} + {x^{11}} + {x^9} + {x^7} + {x^5} + {x^3} + x + 12$$.

Then
A
f(x) has 13 non-zero real roots
B
f(x) has exactly one real root
C
f(x) has exactly one pair of imaginary roots
D
f(x) has no real root
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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