List of top Physics Questions

If a simple harmonic motion is represented by $\frac{d^{2}x}{dt^{2}}+\alpha\,x=0,$ its time period is :
In simple harmonic motion maximum velocity is at
When the kinetic energy of a body executing S.H.M. is $1 / 3$ of the potential energy. The displacement of the body is $x$ percent of the amplitude, where $x$ is :
The length of second's pendulum is $1\, m$ on earth. If mass and diameter of a planet is doubled than that of earth, then its length becomes:
Two identical metal spheres with charges $2Q$ and $-Q$ are separated by a distance. Force between them is F. They are connected by a conducting wire and then removed. Force between them now is
Which of the following is not the property of equipotential surfaces?
A charged ball $B$ hangs from a silk thread $S$, which makes an angle $\theta$ with a large charged conducting sheet $P$, as shown in the figure. The surface charge density $\sigma$ of the sheet is proportional to:
An ice-cube of density $900\, kg / m ^{3}$ is floating in water of density $1000\, kg / m ^{3}$. The percentage of volume of ice-cube outside the water is
The factor responsible for lower mercury level ina capillary tube is
$700\, pF$ capacitor is charged by $50\, V$ battery. Electrostatic energy is stored by it will be :
The charge on capacitors in the following figure is
A fully charged capacitor has a capacitance $'C'$. It is discharged through a small coil of resistance wire embedded in a thermally insulated block of specific heat capacity $s$ and mass $m$. If the temperature of the block is raised by $\Delta T$, the potential difference $V$ across the capacitance is:
A parallel plate capacitor is made by stacking $n$ equally spaced plates connected alternatively. If the capacitance between any two adjacent plates is $C$, then the resultant capacitance is :
Two thin wire rings each having a radius $R$ are placed at a distance $d$ apart with their axes coinciding. The charges on the two rings are $+ q$ and $- q$. The potential difference between the centres of the two rings is :
The figure shows a system of two concentric spheres of radii $r_1$, and $r_2$ and kept at temperatures $T_1$ and $T_2$, respectively. The radial rate of flow of heat in a substance between the two concentric spheres, is proportional to :
If reduction factor of a tangent galvanometer is $900 \,mA$, then the current through it to produce a deflection of $ 45^{\circ} $ is
A magnetic needle is kept in a non-uniform magnetic field. It experiences:
In uniform circular motion, the factor that remains constant is
The maximum range of a gun on horizontal terrain is $16 \,km$, if $g=10 \,m / s ^{2}$. What must be the muzzle velocity of the shell?
A projectile is fired at $30^{\circ}$ with momentum $p$. Neglecting friction, the change in kinetic energy, when it returns back to the ground, will be
A particle is moving under the influence of a force which is fixed in magnitude and acting at an angle $\theta$ in the direction of motion. The path described by the particle is
A projectile can have the same range $R$ for two angles of projection. If $t_1$ and $t_2$ be the times of flights in the two cases, then the product of the two times of flights is proportional to :
A bullet is fired with a speed of $1000 \,m/s$ in order to hit a target $100 \,m$ away. If $g = 10 \,m/s^2$ . The gun should be aimed
The horizontal range of a projectile is $400\, m$. The maximum height attained by it will be:
In Young's double slit experiment, fringe width decreases by 25% when apparatus is immersed in a liquid. Refractive index of the liquid is