Physics-
Consider the given velocity-time graph It represents the motion of

Physics-General
- A projectile projected vertically upward, from a point
- A bullet fired horizontally from the top of a tower
- A car with constant acceleration along a straight road
- An electron in the hydrogen atom
Answer:The correct answer is: A projectile projected vertically upward, from a point
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physics-
An aero plane moving horizontally at a speed of
and at a height of
is to drop a bomb on a target. At what horizontal distance from the target should the bomb be released
Horizontal distance travelled by the bomb 

An aero plane moving horizontally at a speed of
and at a height of
is to drop a bomb on a target. At what horizontal distance from the target should the bomb be released
physics-General
Horizontal distance travelled by the bomb 

chemistry-
Which of the carbon atoms present in the molecule given below are asymmetric?

(ii) and (iii) carbon atoms are asymmetric
Which of the carbon atoms present in the molecule given below are asymmetric?

chemistry-General
(ii) and (iii) carbon atoms are asymmetric
chemistry-
Out of phenoxide and ethnocide ion, only ethoxide ion will react with iodoethane to give diethyl ether 
chemistry-General
Out of phenoxide and ethnocide ion, only ethoxide ion will react with iodoethane to give diethyl ether 
chemistry-
Which of the following compounds will undergo racemization when solution of KOH hydrolyses?
i) 
ii) CH3CH2CH2Cl
iii) 
iv)
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Due to chirality of
only compound (d) will undergo reacemisation
Which of the following compounds will undergo racemization when solution of KOH hydrolyses?
i) 
ii) CH3CH2CH2Cl
iii) 
iv)
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chemistry-General
Due to chirality of
only compound (d) will undergo reacemisation
chemistry-
The major product obtained on monobromination (with Br2/ FeBr3) of the following compound A is

Since both OCH3 and CH3 are o. p directing, the following products are possible

Since OCH3 group is bulkier than CH3 i.e., sterically less hindered ; product (I) is formed Therefore option (B) is correct

Since OCH3 group is bulkier than CH3 i.e., sterically less hindered ; product (I) is formed Therefore option (B) is correct
The major product obtained on monobromination (with Br2/ FeBr3) of the following compound A is

chemistry-General
Since both OCH3 and CH3 are o. p directing, the following products are possible

Since OCH3 group is bulkier than CH3 i.e., sterically less hindered ; product (I) is formed Therefore option (B) is correct

Since OCH3 group is bulkier than CH3 i.e., sterically less hindered ; product (I) is formed Therefore option (B) is correct
chemistry-
The name of monomers present in the following polymer

The name of monomers present in the following polymer

chemistry-General
physics-
Two particles 1 and 2 are projected with same speed
as shown in figure. Particle 2 is on the ground and particle 1 is at a height
from the ground and at a horizontal distance
from particle 2. If a graph is plotted between
and
for the condition of collision of the two then (
on
-axis and
on
-axis)

Assuming particle 2 to be at rest, substituting in


We have
or
Which is a straight line passing through origin with slope

We have
or
Which is a straight line passing through origin with slope
Two particles 1 and 2 are projected with same speed
as shown in figure. Particle 2 is on the ground and particle 1 is at a height
from the ground and at a horizontal distance
from particle 2. If a graph is plotted between
and
for the condition of collision of the two then (
on
-axis and
on
-axis)

physics-General
Assuming particle 2 to be at rest, substituting in


We have
or
Which is a straight line passing through origin with slope

We have
or
Which is a straight line passing through origin with slope
chemistry-
Wurtz reaction of methyl iodide yields an organic compound X. which of the following reaction also yields X ?
Wurtz reaction of methyl iodide yields an organic compound X. which of the following reaction also yields X ?
chemistry-General
maths-
If
is a square matrix of order 3 then
Adj 
If
is a square matrix of order 3 then
Adj 
maths-General
chemistry-
In the reaction R – OH + HX → R – X + H2O, The reactivity of different alcohols is
This is because the order the relative stabilities of the carbocation formed in this reactions is : tertiary > secondary > primary.
In the reaction R – OH + HX → R – X + H2O, The reactivity of different alcohols is
chemistry-General
This is because the order the relative stabilities of the carbocation formed in this reactions is : tertiary > secondary > primary.
physics-
A particle originally at a rest at the highest point of a smooth circle in a vertical plane, is gently pushed and starts sliding along the circle. It will leave the circle at a vertical distance
below the highest point such that

From law of conservation of energy, potential energy of fall gets converted to kinetic energy.




Also, the horizontal component of force is equal centrifugal force.

From Eq. (i)

From





Also, the horizontal component of force is equal centrifugal force.
From Eq. (i)
From
A particle originally at a rest at the highest point of a smooth circle in a vertical plane, is gently pushed and starts sliding along the circle. It will leave the circle at a vertical distance
below the highest point such that

physics-General
From law of conservation of energy, potential energy of fall gets converted to kinetic energy.




Also, the horizontal component of force is equal centrifugal force.

From Eq. (i)

From





Also, the horizontal component of force is equal centrifugal force.
From Eq. (i)
From
physics-
Average torque on a projectile of mass
, initial speed
and angles of projection
, between initial and final position
and
as shown in figure about the point of projection is

Time of flight. 
Horizontal range,
Change in angular momentum,
about point of projection




Horizontal range,
Change in angular momentum,
Average torque on a projectile of mass
, initial speed
and angles of projection
, between initial and final position
and
as shown in figure about the point of projection is

physics-General
Time of flight. 
Horizontal range,
Change in angular momentum,
about point of projection




Horizontal range,
Change in angular momentum,
physics-
A 0.098 kg block slides down a frictionless track as shown. The vertical component of the velocity of block at
is
Vertical component at
A 0.098 kg block slides down a frictionless track as shown. The vertical component of the velocity of block at
is
physics-General
Vertical component at
physics-
A small mass
is attached to a massless string whose other end is fixed at
as shown in the figure. The mass is undergoing circular motion in the
plane with center at
and constant angular speed
. If the angular momentum of the system, calculated about
and
are denoted by
and
respectively, then

A small mass
is attached to a massless string whose other end is fixed at
as shown in the figure. The mass is undergoing circular motion in the
plane with center at
and constant angular speed
. If the angular momentum of the system, calculated about
and
are denoted by
and
respectively, then

physics-General
chemistry-
The monomer used to produce neoprene is
The monomer used to produce neoprene is
chemistry-General