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
only compound (d) will undergo reacemisationWhich of the following compounds will undergo racemization when solution of KOH hydrolyses?
i)
ii) CH3CH2CH2Cl
iii)
iv) </span
chemistry-General
Due to chirality of only compound (d) will undergo reacemisation
only compound (d) will undergo reacemisationchemistry-
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,
about point of projectionAverage 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,
about point of projectionphysics-
A 0.098 kg block slides down a frictionless track as shown. The vertical component of the velocity of block at is
or 
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
or 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