List of practice Questions

When acidified $K_2Cr_2O_7$ solution is added to $Sn^{2+}$ salts, then $Sn^{2+}$ changes to
When $AgNO_3$ is heated strongly the products formed are
When alkyl aryl ether is heated with HI, it gives
When a thermometer is taken from the melting ice to a warm liquid, the mercury level rises to $\frac{2^{th}}{5}$ of the distance between the lower and the upper fixed points. The temperature of liquid in $K$ is
When a voltage measuring device is connected to ac mains, the meter shows the steady input voltage of $220\,V$. This means
When accessory whorls (calyx and corolla) are absent in a flower, it is called
When a solid melts there is
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