List of practice Questions

When a speeding bus stops suddenly, passengers are thrown forward from their seats because
When a sphere is taken to bottom of sea 1 km deep, it contracts by 0.01%. The bulk modulus of elasticity of the material of sphere is (Given, density of water $= 1 gcm^{-3})$
When a plant undergoes senescence, the nutrients may be
When a plasmolysed cell is placed in water or hypotonic solution, what happens?
When a positively charged particle enters a uniform magnetic field with uniform velocity its trajectory can be a) straight line b)a circle c) a helix
When a ring is rolling $V_1, V_2, V_3, V_4$ are velocities of top most point, lowest point, end point of horizontal diameter, center of ring respectively. The decreasing order of these velocities is
When a mixture of air and steam is passed over red hot coke, the outgoing gas is
When a mixture of NaCl and KCl is heated with cone. $H_2SO_4$ and $K_2Cr_2O_7$. The red gas obtained is
When a nucleus in an atom undergoes a radioactive decay, the electronic energy levels of the atom
When a lead storage battery is discharged
When a low flying aircraft passes overhead, we sometimes notice a slight shaking of the picture on our TV screen. This is because of between the direct signal and reflected signal
When a mass is rotating in a plane about a fixed point its angular momentum is directed along
When a metal is to be extracted from its ore and if the gangue associated with the ore is silica, then
When a hydrogen atom is raised from the ground state to an excited state
When a lead storage battery is charged it acts as
When a lead storage battery is discharged
When a cylindrical tube is dipped vertically into a liquid the angle of contact is $140^{\circ}$. when the tube is dipped with an inclination of $40^{\circ}$ the angle of contact is
When a convex mirror of focal length $f$ produces an image $\left(\frac{1}{n}\right)th$ of the size of the object ,then distance of the object from the mirror is
When a capillary tube is dipped in a liquid, the liquid rises to a height $h$ in the tube. The free liquid surface inside the tube is hemispherical in shape. The tube is now pushed down so that the height of the tube outside the liquid is less than $h$. Then the
When a capillary tube is immersed into a liquid the liqaid neither rises nor falls in the capatillary , then the angle of contact is
When a constant torque is applied on a rigid body, then
When a colloidal solution is viewed from the direction at right angles of light beam, the path of the beam is illuminated due to scattering of light. In the figure $(A)$ and $(B)$ are
When 2-pentyne is treated with dil.$H_2SO_4$ and $HgSO_4$ the product formed is
When a body lighter than water is completely submettied in water, the body force acting on it is found to be 'n' times its weight. The specific gravity of the material of the body is
When a body slides down from rest along a smooth inclined plane making an angle of $45^?$ with the horizontal, it takes time $T$. When the same body slides down from rest along a rough inclined plane making the same angle and through the same distance, it is seen to take time $pT$, where $p$ is some number greater than $1$. The co-efficient of friction between the body and the rough plane is