List of top Physics Questions

The area of the acceleration-displacement curve of a body gives

Activity of radioactive element decreased to one-third of original activity $R_{o}$ in $9\, yr$. After further $9\, yr$, its activity will be

Angle of repose is equal to the angle of limiting friction. When the body is just at the point of motion, the force of friction in this stage is called limiting friction.

If the colour code of carbon resistor is as follows, then give the value of its resistance in $k \, \Omega$, Colour of I strip-yellow Colour of II strip-blue Colour of III strip-orange Colour of IV strip-gold

The Bulk Modulus for an incompressible liquid is

Figure shows three resistor configurations $R_{1}, R_{2}$ and $R_{2}$ connected to $3 V$ battery. If the power dissipated by the configuration $R_{1}, R_{2}$ and $R_{3}$ is $P_{1}, P_{2}$ and $P_{3}$, respectively, then

In a potentiometer, the null point is received at $7th$ wire. If now we have to change the null point at the $9th$ wire, what should we do?

In a potentiometer, the null point is received at $7th$ wire. If now we have to change the null point at the $9th$ wire, what should we do?

A galvanometer coil has a resistance of $15\, \Omega$ and gives full scale deflection for a current of $4\, mA$. To convert it to an ammeter of range $0$ to $6\, A$

A body executes simple harmonic motion. The potential energy (PE), the kinetic energy (KE) and total energy (TE) are measured as function of displacement x. Which of the following statements is true?

A mass M is suspended from a spring of negligible mass. The spring is pulled a little and then released so that the mass executes SHM of time period T. If the mass is increased by m, the time period becomes $ \text{5T/3,} $ then the ratio of $ \frac{m}{M} $ is

In an SHM, kinetic and potential energies become equal when the displacement is 1/$\sqrt{2}$ times the amplitude. In SHM, kinetic energy is zero when potential energy is maximum.

Three point charges $ +q,-2q $ and $ +q $ are placed at points $ (x=0,y=a,x=0), $ $ (x=0,y=0,z=0) $ and $ (x=a,y=0,z=0), $ respectively. The magnitude and direction of the electric dipole moment vector of this charge assembly are

Three charges $ 1\mu C, $ $ 1\mu C $ and $ 2\mu C $ are kept at vertices of $A, B$ and $C$ of an equilateral triangle $ABC$ of $ 10\,cm $ side respectively. The resultant force on the charge at $C$ is

A charge $q$ is uniformly distributed on a ring of radius $r$. A sphere of an equal radius is constructed with its centre lying on the periphery of the ring. The flux of electric field through the surface of the sphere will be

If charge and distance between two charges are reduced to half. Force between them

If the electric flux entering and leaving an enclosed surface respectively are $\phi_{1}$ and $\phi_{2}$, the electric charge inside the surface will be

An electric dipole of moment $p$ is Iying along a uniform electric field $E$. The work done in rotating the dipole by $90^{\circ}$ is

Electric field at the centre of a uniformly charged semicircle of radius a is

Two glass plates are separated by water. If surface tension of water is $75$ dyne/cm and area of each plate wetted by water is $8\, cm ^{2}$ and the distance between the plates is $0.12 \,mm$, then the force applied to separate the two plates is

The excess pressure inside a soap bubble is three times than excess pressure inside a second soap bubble, then the ratio of their surface area is

64 small drops of water having same charge and same radius are combined to form one big drop. The ratio of capacitance of big drop to small drop is

Work done in placing a charge of $ 8\times 10^{-18}C $ on a condenser of capacity $100 \, \mu \, F$ is

Two spherical conductors B and C having equal radii and carrying equal charges in them repel each other with a force F when kept apart at some distance. A third spherical conductor having same radius as that of B but uncharged, is brought in contact with B, then brought in contact with C and finally removed away from both. The new force of repulsion between B and C is