List of top Physics Questions asked in WBJEE

At two different places the angles of dip are respectively $30^{\circ}$ and $45^{\circ}$. At these two places the ratio of horizontal component of earth?s magnetic field is
A planet moves around the sun in an elliptical orbit with the sun at one of its foci. The physical quantity associated with the motion of the planet that remains constant with time is
A block of mass $m (= 0.1 kg)$ is hanging over a frictionless light fixed pulley by an inextensible string of negligible mass. The other end of the string is pulled by a constant force $F$ in the verticaly downward direction. The linear momentum of the block increase by $2\,kg$ $ms^{-1}$ in $1\,s$ after the block starts from rest. Then, (given $g \,= \,10\,ms^{-2}$)
A frictionless piston-cylinder based enclosure contains some amount of gas at a pressure of $400 \,kPa$. Then heat is transferred to the gas at constant pressure in a quasi-sta ic process. The piston moves up slowly through a height of $10\,cm$. If the piston has a cross-section area of $0.3 \,m^2$, the work done by the gas in this process is
A particle is moving with a uniform speed $v$ in a circular path of radius $r$ with the centre at $O$. When the particle moves from a point $P$ to $Q$ on the circle such that $? POQ=\theta$, then the magnitude of the change in velocity is
A mass $M$ at rest is broken into two pieces having masses $m$ and $(M-m)$. The two masses are then separated by a distance $r$. The gravitational force between them will be the maximum when he ratio of the masses $[m:(M-m)]$ of the two parts is
A biconvex lens of focal length $f$ and radii of curvature of both the surfaces $R$ is made of a material of refractive index $n_1$. This lens is placed in a liquid of refractive index $n_2$. Now this lens will behave like
Water is flowing in streamline motion through a horizontal tube. The pressure at a point in the tube is $p$ where the velocity of flow is $v$. At another point, where the pressure is $p/2$, the velocity of flow is [density of water = $?$]
The dimension of angular momentum is
The decimal number equivalent to a binary number 1011001 is
A particle is travelling along a straight line $OX$. The distance $x$ (in metres) of the particle from $O$ at a time $t$ is given by $X=37+27t-t^{3}$ where $t$ is time in seconds. The distance of the particle from $O$ when it comes to rest is
The magnetic flux linked with a coil satisfies the relation $\phi= (4t^2 + 6t + 9) Wb$, where $t$ is the time in second. The e.m.f. induced in the coil at $t\, =\, 2$ second is
From the top of a tower, $80\, m$ high from the ground, a stone is thrown in the horizontal direction with a velocity of $8\, ms^{-1}.$ The stone reaches the ground after a time ?t? and falls at a distance of ?d? from the foot of the tower. Assuming $g=10\, ms^{-2},$ the time t and distance d are given respectively by
In a mercury thermometer, the ice point (lower fixed point) is marked as $10^{\circ}$ and the steam point (upper fixed point) is marked as $130^{\circ}$. At $40^{\circ} C$ temperature, what will this thermometer read?
Water is flowing through a very narrow tube. The velocity of water below which the flow remains a streamline flow is known as
In a slide callipers, $(m + 1)$ number of vernier divisions is equal to m number of smallest main scale divisions. If d unit is the magnitude of the smallest main scale division, then the magnitude of the vernier constant is
If the velocity of light in vacuum is $3\times10^{8}\, ms^{-1},$ the time taken (in nanosecond) to travel through a glass plate of thickness $10 \,cm$ and refractive index $1.5$ is
A body when fully immersed in a liquid of specific gravity $1.2\, $ weighs $44\,gwt$. The same body when fully immersed in water weighs $50\, gwt$. The mass of the body is
In the adjoining figure the potential difference between $X$ and $Y$ is $60\,V$. The potential difference the points $M$ and $N$ will be
A charge $+q$ is placed at the origin $O$ of $X-Y$ axes as shown in the figure. The work done in taking a charge $Q$ from $A$ to $B$ along the straight line $AB$ is
A Wheatstone bridge has the resistances $10\, \Omega,\, 10\, \Omega, 10\, \Omega$ and $30\, \Omega$ in its four arms. What resistance joined in parallel to the $30\, \Omega$ resistance will bring it to the balanced condition?
What current will flow through the $2\,k\Omega$ resistor in the circuit shown in the figure?
An object placed in front of a concave mirror at a distance of $x \,cm$ from the pole gives a $3$ times magnified real image. If it is moved to a distance of $(x+5)\, cm$, the magnification of the image becomes $2$. The focal length of the mirror is
If the focal length of the eye-piece of a telescope is doubled, its magnifying power $(m)$ will be
A body floats in water with $40\%$ of its volume outside water. When the same body floats in an oil, $60\%$ of its volume remains outside oil. The relative density of oil is