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JEE 2020 Physics: Kinematics Quiz 1 (16.07.2019)

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Question 1

A flag is mounted on a car moving due North with velocity of 20 km/hr. Strong winds are blowing due East with velocity of 20 km/hr. The flag will point it direction

Question 2

A boat having a speed of 5 km/hr. in still water, crosses a river of width 1 km along the shortest possible path in 15 minutes. The speed of the river in Km/hr.

Question 3

A man is crossing a river flowing with velocity of 5 m/s. He reaches a point directly across at a distance of 60 m in 5 sec. His velocity in still water should be

Question 4

A swimmer swims in still water at a speed = 5 km/ hr. He enters a 200 m wide river, having river flow speed = 4 km/hr at point A and proceeds to swim at an angle of 127° (sin37° = 0.6) with the river flow direction. Another point B is located directly across A on the other side. The swimmer lands on the other bank at a point C, from which he walks the distance CB with a speed = 3 km/hr. The total time in which he reaches from A to B is

Question 5

Wind is blowing in the north direction at speed of 2 m/s which causes the rain to fall at some angle with the vertical. With what velocity should a cyclist drive so that the rain appears vertical to him

Question 6

Two guns A and B can fire bullets at speeds 1 km/s and 2 km/s respectively. From a point on a horizontal ground, they are fired in all possible directions. The ratio of maximum areas covered by the bullets fired by the two guns, on the ground is :

Question 7

In the cube of side 'a' shown in the figure, the vector from the central point of the face ABOD to the central point of the face BEFO will be:

Question 8

The position co-ordinates of a particle moving in a 3-D coordinate system is given by
x= a cosωt
y= a sinωt and
z= a ωt
The speed of the particle is :

Question 9

In a car race on straight road, car A takes a time less than car B at the finish and passes finishing point with a speed ‘v’ more than that of car
B. Both the cars start from rest and travel with constant acceleration a1 and a2 respectively. Then 'v' is equal to:

Question 10

If a ray travelling in the direction is incident on a plane mirror. After reflection, the ray travels along the direction. The angle of incidence is
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Dec 10JEE & BITSAT