Chemistry-
General
Easy
Question
Which of the following noble gas was reacted with 
by Bartlett to prepare the first noble gas compounds -
- He
- Xe
- Ar
- Kr
The correct answer is: Xe
Related Questions to study
physics-
A set of 
identical cubical blocks lies at rest parallel to each other along a line on a smooth horizontal surface. The separation between the near surfaces of any two adjacent blocks is 
. The block at one end is given a speed 
towards the next one at time 
. All collision are completely elastic. Then
A set of identical cubical blocks lies at rest parallel to each other along a line on a smooth horizontal surface. The separation between the near surfaces of any two adjacent blocks is . The block at one end is given a speed towards the next one at time . All collision are completely elastic. Then
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The blocks and , each of mass , are connected by massless spring of natural length and spring constant . The blocks are initially resting on a smooth horizontal floor with the spring at its natural length, as shown in figure. A third identical block , also of mass , moves on the floor with a speed along the line joining and , and collides with . Then
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Find the velocity of centre of the system shown in the figure.
Find the velocity of centre of the system shown in the figure.
physics-General
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Two blocks and are connected by a massless string (shown in figure). A force of 30 N is applied on block . The distance travelled by centre of mass in 2 s starting from rest is
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Three rods of the same mass are placed as shown in figure. What will be the coordinates of centre of mass of the system?
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If 
then descending order of 
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If then descending order of
is
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A disc is rolling (without slipping) on a horizontal surface is its centre and 
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The acceleration of the center of mass of a uniform solid disc rolling down an inclined plane of angle 
is
The acceleration of the center of mass of a uniform solid disc rolling down an inclined plane of angle is
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A solid sphere of mass rolls down an inclined plane without slipping, starting from rest at the top of an inclined plane. The linear speed of the sphere at the bottom of the inclined plane is . The kinetic energy of the sphere at the bottom is
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Physics-General
Physics-
The moments of inertia of two freely rotating bodies and are 
and 
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The moments of inertia of two freely rotating bodies and are and respectively. and their angular momenta are equal. If and are their kinetic energies, then
Physics-General
biology
Famous palaeonotologist/Palaeobotanist of India was:
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A small object of uniform density roll up a curved surface with an initial velocity . If reaches up to a maximum height of 
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A uniform rod 
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and mass is free to rotate about point . The rod is released from rest in the horizontal position. Given that the moment of inertia of the rod about is
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A uniform rod of length and mass is free to rotate about point . The rod is released from rest in the horizontal position. Given that the moment of inertia of the rod about is, the initial angular acceleration of the rod will be
physics-General
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A particle of mass moves in the 
plane with a velocity along the straight line . If the angular momentum of the particle with respect to origin 
is 
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maths-
Assertion (A): If the system of equations 
have non zero solution then 
Reason (R): If the system of equations 
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Reason (R): If the system of equations has a non zero solution then is singular
maths-General
