List of practice Questions

just as hydrochloric acid is to pepsinogen, so is
A circular coil of radius $R$ carries an electric current. The magnetic field due to the coil at a point on the axis of the coil located at a distance $r$ from the center of the coil, such that $r > > R$, varies as
Sodium lamps are used in foggy conditions because
The temperature $(T )$ dependence of resistivity $(r)$ of a semiconductor is represented by
A proton and an $\alpha$ - particle, moving with the same velocity, enter into a uniform magnetic field, acting normal to the plane of their motion. The ratio of the radii of the circular paths described by the proton and $\alpha$ - particle is
A sphere of mass $M$ and radius $R$ is falling in a viscous fluid. The terminal velocity attained by the falling object will be proportional to
Mongolism is also known as
Two long conductors, separated by a distance d carry current $I_1$ and $I_2$ in the same direction. They exert a force $F$ on each other. Now the current in one of them increased to two times and its direction reversed. The distance is also increased to $3d$. The new value of the force between them is
In a step-up transformer ratio of number of turns in primary to seconday coil is $1: 25 .$ If input voltage is $230$ volt and load current is $2 \,amp$, then current in primary is :
For a transistor amplifier in common emitter configuration having load impedance of $1\, kO$ ($h_{fe} = 50$ and $h_{oe} = 25$) the current gain is
Which one of the following ores is best concentrated by froth - floatation method?
An ideal gas expands in volume from $1?10^{-3} m^3$ to $1?10^{-2} m^3$ at $300\, K$ against a constant pressure of $1?10^5\, Nm^{-2}$. The work done is
Which of the following sets of quantum numbers is correct for an electron in 4f orbital?
As the temperature is raised from $20^{\circ}C$ to $40^{\circ}C$, the average kinetic energy of neon atoms changes by a factor of which of the following?
When the glancing angle of incidence of light on a material is 30$^\circ$, the reflected and refracted light are found to be perpendicular. The refractive index of material is
Two waves having intensity ratio 25 : 4 produce interference. The ratio of maximum to minima intensity is
In diffraction through a single slit experiment, slit width is halved, then
Which cell organelle is present in both prokaryotic and eukaryotic cell?
Two vectors have magnitudes 3 and 5. If angle between them is 60$^{\circ}$, then the dot product of two vectors will be
The volume of a metal sphere increases by $ \text{0}\text{.15 }\!\!%\!\!\text{ } $ when its temperature is raised by $ \text{24}{{\,}^{\text{o}}}\text{C}\text{.} $ The coefficient of linear expansion of metal is:
The relative permeability of iron is $6000$. Its magnetic susceptibility is
As shown in figure, a planet revolves in elliptical orbit around the sun. Where is KE of the planet maximum?
A triode valve has an amplification factor of 20 and its plate is given a potential of 300 V. The grid-voltage to reduce the plate current to zero, is :
For a satellite moving in an orbit around the earth, the ratio of kinetic to potential energy is:
In an ideal parallel LC circuit, the capacitor is charged by connecting it to a DC source which is then disconnected. -The current in the circuit: