List of practice Questions

An electron is projected with uniform velocity along the axis of a current carrying long solenoid. Which of the following is true?
An electron is revolving around a proton in a circular path of diameter 0.1 nm. It produces a magnetic field $14\,Wb\,m^{-2}$ at the proton. The angular speed of the electron is
An electron and a proton are detected in a cosmic ray experiment, the first with kinetic energy $10 \,keV$, and the second with $100 \,keV$. The ratio of their speeds is (where $m_e$ and $m_p$ are masses of electron and proton respectively)
An electron is in one of the $3d$-orbitals. What are the possible values of $n$, $l$ and $m$ for this electron?
An electrolytic cell contains a solution of $Ag_2SO_4$ and have platinum electrodes. A current is passed until 1.6 gm of $O_2$ has been liberated at anode. The amount of silver deposited at cathode would be
An electromagnetic wave can be produced, when charge is
An Electric field can deflect
An electric current is passed through silver voltameter connected to a water voltmeter. The cathode of the silver voltameter is 0.108 g moreat the end of the electrolysis. The volume ofoxygen evolved at STP is :
An automobile engine develops $100 \,kW$ power when rotating at a speed of $1800\, rpm$. The torque delivered by the engine is
An automobile travelling at $50\, kmh^{-1}$, can be stopped at a distance of 40 m by applying brakes. If the same automobile is travelling at 90 $kmh^{-1}$, all other conditions remaining same and assuming no skidding, the minimum stopping distance in metre is
An edge of a variable cube is increasing at the rate of 10cm/sec. How fast the volume of the cube will increase when the edge is 5 cm long ?
An efficient root inducing chemical useful in Horticulture is
An asteroid of mass m is approaching earth, initially at a distance of 10$R_e$, with speed $v_i$. It hits the earth with a speed $v_f$ ($R_e$ and $M_e$ are radius and mass of earth), then
An asymmetric flower is
An athlete completes one round of a circular track of radius $10\, m$ in $40 \,s$. The distance covered by him in $2$ minutes $20$ seconds is
An auto travelling along a straight road increases its speed from $30.0\, m \,s^{-1}$ to $50.0 \,m \,s^{-1}$ in a distance of $180 \,m$. If the acceleration is constant, how much time elapses while the auto moves this distance ?
An arsenious sulphide sol carries a negative charge. The maximum precipitating power for this sol is possessed by
An artificial satellite of the earth releases a packet. If air resistance is neglected, the point where the packet will hit, will be
An artificial satellite revolves around earth in circular orbit of radius r with time period of orbit T. The satellite is made to stop in the orbit which makes it fall into earth. Time of fall of the satellite onto earth is given by
An association between roots of higher plants and fungi is called
An aqueous solution of sodium carbonate is' alkaline because sodium carbonate is a salt of
An antibiotic contains nitro group attached to aromatic nucleus in its structure. It is
An antitranspirant is
An amorphous solid $(X)$ burns in air to form a gas $(Y)$ which turns lime water milky. This gas decolourises aqueous solution of acidified $KMnO_4$. Gas $(Y)$ reacts with oxygen to give another gas $(Z)$ which is responsible for acid rain. $X$, $Y$ and $Z$ are
An amplifier has a voltage gain of $100$. The voltage gain in $dB$ is