List of top Physics Questions

A solid cylinder of mass 2 kg and radius 4 cm is rotating about its axis at the rate of 3 rpm. The torque required to stop after 2$\pi$revolutions is:
A solid copper sphere of density $\rho$, specific heat capacity $C$ and radius $r$ is initially at $200\, K$. It is suspended inside a chamber whose walls are at $0\, K$. The time required (in (is) for the temperature of the sphere to drop to $100 \,K$ is ($\sigma$ is Stefan's constant and all the quantities are in SI units)
The magnitude of the de-Broglie wavelength $\left(\lambda\right)$ of electron (e), proton (p), neutron (n) and a-particle (a) all having the same energy of 1 MeV, in the increasing order will follow the sequence

A circuit contain two resistors R1 and R2 in series. Find the ratio of input voltage to voltage to R2 

A potential difference V = 100 $\pm$ 5 V, when applied across a resistance, gives a current I = 10 ? 0.2 A, What is the percentage error in R?
Kichhoff?s junction rule is a reflection of
Find the current drawn from the battery just after the switch is closed
Silicones are -
The readings of ammeter and voltmeter in the following circuit are respectively
To convert a galvanometer into an ammeter, one needs to connect a
Two batteries of emf 6V and 3V with internal resistances $1 \Omega$ and $2\Omega$ respectively are connected as shown in figure. the potential difference across A and B is
Average velocity of a particle executing SHM in one complete vibration is :
A piston is performing S.H.M. in the vertical direction with a frequency of 0.5 Hz. A block of 10 kg is placed on the piston. The maximum amplitude of the system such that the block remains in contact with the piston is
A spring of natural length $l$ and spring constant $50\, N/m$ is kept on a horizontal frictionless table with one end attached to a rigid support. First the spring was compressed by $10\, cm$ and then released to hit a ball of mass $20\, g$ kept at a distance l from the rigid support. if after hitting the ball, the natural length of the spring is restored, what is the speed with which the ball moved? (Ignore the air resistance)

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion (A) : The centre of mass of an electron and proton, when released moves faster towards proton. 

Reason (R) : This is because proton is heavier.

In the light of the above statements, choose the correct answer from the options given below

An electric dipole with dipole moment $\frac{p_{0}}{\sqrt{2}}\left(\hat{i}+\hat{j}\right)$ is held fixed at the origin O in the presence of an uniform electric field of magnitude E. If the potential is constant on a circle of radius R centered at the origin as shown in figure, then the correct statement(s) is/are: ($\varepsilon_{0}$ is permittivity of free space, R >> dipole size)
A charged shell of radius $R$ carries a total charge $Q$. Given $\Phi$ as the flux of electric field through a closed cylindrical surface of height $h$, radius $r$ and with its center same as that of the shell. Here, center of the cylinder is a point on the axis of the cylinder which is equidistant from its top and bottom surfaces. Which of the following option(s) is/are correct? [$\varepsilon_{0}$ is the permittivity of free space]
A parallel plate capacitor consists of two circular plates each of radius $2 \,cm$, separated by a distance of $0.1 \,mm$. If the potential difference across the plates is varying at the rate of $5 \times 10^{6} Vs ^{-1}$, then the value of displacement current is
Calculate charge on capacitor in steady state.
What is the total capacitance of the combination when $ 3 $ capacitors each of capacitance $ 9 \,pF $ are connected in series?
Coersivity of a magnet where the ferromagnet gets completely demagnetized is $3 \times 10^3 Am^{?
A body is projected at an angle of $60^{\circ}$ with the horizontal such that the vertical component of its initial velocity is $40\, ms^{-1}$. The magnitude of velocity of the projectile at one quarter of its time of flight is nearly, (Acceleration due to gravity = $10 \,ms^{-2}$)
Which one of the following nuclei has shorter mean life?
The time period of a geostationary satellite is 24 h, at a height 6R (R is radius of earth) from surface of earth. The time period of another satellite whose height is 2.5 R from surface will be,
In a permanent magnet at room temperature