List of practice Questions

The magnetic moment of a short bar magnet placed with its magnetic axis at $30^{\circ}$ to an external field of $900\, G$ and experiences a torque of $0.02\, N\, m$ is
The magnetic susceptibility for diamagnetic materials is
The magnifying power of an astronomical telescope can be increased if we
The magnitude of acceleration of particle executing SHM at the position of maximum displacement is
The magnetic flux $\phi$ (in weber) linked with a coil of resistance 10 $\Omega$ varies with time t (in second) as $\phi$ = $8t^2 - 4t + 1$. The current induced in the coil at t = 0.1 sec is
The magnetic flux ($\phi$) linked with a coil is related to the area (A) of the coil as :
The magnetic field inside a toroidal solenoid of radius R is B. If the current through it is doubled and its radius is also doubled keeping the number of turns per unit length the same magnetic field produced by it will be :
The magnetic field of a cylindrical magnet that has a pole-face radius $2.8 \,cm$ can be varied sinusoidally between minimum value $16.8 \,T$ and maximum value $17.2 \,T$ at a frequency of $\frac{60}{\pi}\,Hz$ Cross section of the magnetic field created by the magnet is shown. At a radial distance of $2\, cm$ from the axis, find the amplitude of the electric field (in $mN \,C^{-1})$ induced by the magnetic field variation.
The macrophages in human body exhibit
The longest wavelength doublet absorption transition is observed at $589$ and $589.6\,nm$. Energy difference between two excited states is
The lower end of a capillary tube of radius r is placed vertically in water then with the rise of water in the capillary heat evolved is
The lower surface of leaf will have more number of stomata in a
The logically equivalent preposition of $p \Leftrightarrow q$ is
The locus of the point of intersection of lines $x \cos \, \alpha + y \sin \alpha = a$ and $x \sin \alpha - y \cos \alpha = b$ ($\alpha$ is a variable)
The locus of the vertices of the family of parabola $ 6y = 2a^3x^2 + 3a^2x - 12a $ is
The locus of the equation $xyz = 0$ is
The locus of the foot of the perpendicular from the centre of the ellipse $\frac{x^2}{a^2}+\frac{y^2}{b^2} = 1$ on any tangent is given by $(x^2+y^2) = lx^2+my^2$,where
The lines x + 2y - 5 = 0, 2x - 3y + 4 = 0, 6x + 4y - 13 = 0
The liquid drop model of nucleus was proposed by
The linear strain in x ,y and z directions are $e_x,e_y$ and $e_z$. respectively. Then the volumetric strain is given by
The lines $a_1x + b_1y + c_1 = 0$, $a_2x + b_2y + c_2 - 0$ and $a_3x = 0$ are concurrent, if $b_1c_2 - b_2c_1$ is equal to
The line $ y = 2x + c$ is. a tangent to the parabola $ y^2 = 16x$, if c equals
The linear momentum of a $3\, MeV$ photon is
The limiting radius ratio for tetrahedral shape is:
The line $\frac {x} {a} + \frac {y} {b} =1$ touches the curve $y = be^{-x/a}$ at the point