Physics-
General
Easy
Question
A boat crosses a river from port 
to port 
, which are just on the opposite side. The speed of the water is 
and that of boat is 
relative to still water. Assume 
. What is the time taken by the boat, if It has to cross the river directly on the 
line
The correct answer is:
From figure, 
Time taken to cross the river,
Related Questions to study
Physics-
A body starts from rest. What is the ratio of the distance travelled by the body during the 4th and 3rd second
A body starts from rest. What is the ratio of the distance travelled by the body during the 4th and 3rd second
Physics-General
Physics-
Four marbles are dropped from the top of a tower one after the other with an interval of one second. The first one reaches the ground 4 seconds. When the first one reaches the ground the distances between the first and second, the second and third and the third and forth will be respectively
Four marbles are dropped from the top of a tower one after the other with an interval of one second. The first one reaches the ground 4 seconds. When the first one reaches the ground the distances between the first and second, the second and third and the third and forth will be respectively
Physics-General
Physics-
The displacement of a particle is given by 
. The initial velocity and acceleration are respectively
The displacement of a particle is given by . The initial velocity and acceleration are respectively
Physics-General
Physics-
A ball is dropped vertically from a height 
above the ground. It hits the ground and bounces up vertically to a height 
Neglecting subsequent motion and air resistance, its velocity 
varies with the height 
above the ground as
A ball is dropped vertically from a height above the ground. It hits the ground and bounces up vertically to a height Neglecting subsequent motion and air resistance, its velocity varies with the height above the ground as
Physics-General
Physics-
The three initial and final position of a man on the 
axis are given as
i) 
ii) 
and iii) 
Which pair gives the negative displacement
The three initial and final position of a man on the axis are given as
i) ii) and iii)
Which pair gives the negative displacement
Physics-General
Physics-
A particle moving in a straight line with uniform acceleration is observed to be a distance 
from a fixed point initially. It is at distances 
from the same point after 
second. The acceleration of the particle is
A particle moving in a straight line with uniform acceleration is observed to be a distance from a fixed point initially. It is at distances from the same point after second. The acceleration of the particle is
Physics-General
Physics-
An aeroplane files 
north and 
south and then files 
upwards then net displacement is
An aeroplane files north and south and then files upwards then net displacement is
Physics-General
Physics-
Two bodies are thrown simultaneously from a tower with same initial velocity 
: one vertically upwards, the other vertically downwards. The distance between the two bodies after time 
is
Two bodies are thrown simultaneously from a tower with same initial velocity : one vertically upwards, the other vertically downwards. The distance between the two bodies after time is
Physics-General
Physics-
A particle starting from rest falls from a certain height. Assuming that the value of acceleration due to gravity remains the same throughout motion, its displacement in three successive half second intervals are 
.
Then,
A particle starting from rest falls from a certain height. Assuming that the value of acceleration due to gravity remains the same throughout motion, its displacement in three successive half second intervals are .
Then,
Physics-General
Biology
Large number of chloroplast are present in which of the following cells?
Large number of chloroplast are present in which of the following cells?
BiologyGeneral
Biology
Photosynthesis is maximum in
Photosynthesis is maximum in
BiologyGeneral
Biology
Which of the following is formed during photorespiration?
Which of the following is formed during photorespiration?
BiologyGeneral
Biology
Photosynthetic enhancement with flashing light was first observed by
Photosynthetic enhancement with flashing light was first observed by
BiologyGeneral
Biology
Aldolase enzyme is present in
Aldolase enzyme is present in
BiologyGeneral
Biology
Grana is ill developed or absent in the chloroplast in the
Grana is ill developed or absent in the chloroplast in the
BiologyGeneral
