List of practice Questions

During a journey from earth to moon and back, the greatest energy required from the rocket of the space ship is to overcome
An elastic string has length $ \beta $ when subjected to 5 N tension. Its length is a when tension 4 N. When subjected to a tension of 9 N, its length will become
A smooth sphere A is moving on a frictionless horizontal plane with angular velocity $?$ and centre of mass velocity v. It collides elastically and head on with an identical sphere B at rest. Neglect friction everywhere. After the collision their angular speeds are $?_A$ and $?_B$ respectively. Then,
A gas will approach ideal behaviour at
A gas $X$ at $1$ atm is bubbled through a solution containing a mixture of $1M$ $Y^-$ and $1 MZ^-$ ions at $25 ^\circ C$. If the reduction potenital of $Z > Y > X$, then
A disc of mass M and radius R is rolling with angular speed to on a horizontal plane as shown. The magnitude of angular momentum of the disc about the origin O is
A cubical block of side a moving with velocity v on a horizontal smooth plane as shown. It hits a ridge at point O. The angular speed of the block after it hits O is
A coil of inductance 8.4 mH and resistance $ 6 \Omega$ is connected to a 12 V battery. The current in the coil is 1A at approximately the time
Yellow light is used in a single slit diffraction experiment with slit width of 0.6 mm. If yellow light is replaced by X-rays, then the observed pattern will reveal
A thin slice is cut out of a glass cylinder along a plane parallel to its axis. The slice is placed on a flat plate as shown. The observed interference fringes from this combination shall be
A charged particle is released from rest in a region of steady and uniform electric and magnetic fields which are parallel to each other. The particle will move in a
A spring of force constant k is cut into two pieces such that one piece is double the length of the other. Then, the long piece will have a force constant of
The optically active tartaric acid is named as D-(+)-tartaric acid because it has a positive
In compounds of type $EC1_3$, where E = B , P, As or Bi, the angles Cl-E - Cl for different E are in the order
On heating ammonium dichromate, the gas evolved is
Which of the following gives lactic acid on treating with HCN followed by hydrolysis?
Watt per ampere is unit of:
Valves are present in:
Two like magnetic poles of strength 10 and 40 S.I. units are separated by a distance 30cm. The intensity of magnetic field is zero on the line joining them:
The product obtained, when acetophcnone is treated with zinc-amalgum in cone. $ HCl, $ is:
The oxide which is not reduced by hydrogen is:
The compound which does not possess a peroxide linkage is:
The addition of an inert gas at constant volume to an equilibrium will favour :
Sodium phenoxide, when treated with $ C{{O}_{2}} $ under pressure, give:
Isotonic solution have same: