1
JEE Main 2019 (Online) 9th April Morning Slot
+4
-1
The stream of a river is flowing with a speed of 2km/h. A swimmer can swim at a speed of 4km/h. What should be the direction of the swimmer with respect to the flow of the river to cross the river straight ?
A
150°
B
120°
C
60°
D
90°
2
JEE Main 2019 (Online) 8th April Evening Slot
+4
-1
A particle starts from origin O from rest and moves with a uniform acceleration along the positive x-axis. Identify all figures that correctly represent the motion qualitatively. (a = acceleration, v = velocity, x = displacement, t = time)
A
(B), (C)
B
(A)
C
(A), (B), (C)
D
(A), (B), (D)
3
JEE Main 2019 (Online) 8th April Morning Slot
+4
-1
Ship A is sailing towards north-east with velocity $$\mathop v\limits^ \to = 30\mathop i\limits^ \wedge + 50\mathop j\limits^ \wedge$$ km/hr where $$\mathop i\limits^ \wedge$$ points east and $$\mathop j\limits^ \wedge$$ , north. Ship B is at a distance of 80 km east and 150 km north of Ship A and is sailing towards west at 10 km/hr. A will be at minimum distance from B in :
A
2.2 hrs
B
4.2 hrs
C
2.6 hrs
D
3.2 hrs
4
JEE Main 2019 (Online) 12th January Morning Slot
+4
-1
A person standing on an open ground hears the sound of a jet aeroplane, coming from north at an angle 60o with ground level. But he finds the aeroplane right vertically above his position. If v is the speed of sound, speed of the plane is :
A
$${{\sqrt 3 } \over 2}$$v
B
$${{2v} \over {\sqrt 3 }}$$
C
v
D
$${v \over 2}$$
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