List of top Physics Questions

$E=-\frac{dV}{dr}$ here negative sign sigified that

Seven resistances are connected as shown in the given figure. The equivalent resistance between A and B is

Five equal resistances each of resistance $R$ are connected as shown in the figure. A battery of $V$ volts is connected between $A$ and $B$. The current flowing in $AFCEB$ will be

A beam of electrons is moving with constant velocity in a region having electric and magnetic fields of strength $20 \, Vm^{-1} $ and 0.5 T at right angles to the direction of motion of the electrons. What is the velocity of the electrons?

A positively charged particle is released from rest in a uniform electric field. The electric potential energy of the charge

A satellite is revolving round the earth with orbital speed $v_0$. If it stops suddenly, the speed with which it will strike the surface of earth would be ($v_e= $ escape velocity of a body on earth's surface)

A polarizer and an analyzer are oriented so that the maximum amount of lights is transmitted. Fraction of its maximum value is the intensity of the transmitted light reduced when the analyzer is rotated through (intensity of incident light = $I_0$) a) 30$^\circ$ b)45$^\circ$ c)60$^\circ$

A point moves with uniform acceleration $v_1,v_2$ and $v_3$ denote the average velocities in three successive intervals of time $t_1, t_2$ and $ t_3 $. Correct relation among the following is

When a solid sphere rolls without slipping down an inclined plane making an angle $\theta$ with the horizontal, the acceleration of its centre of mass is $a$. If the same sphere slides without friction, its acceleration $a'$ will be

Which ofthe following quantities has the unit Kg $m^2\,s^{-3}\,A^{-2}$

Which of the following is not a unit of time?

A radioactive isotope is being produced at a constant rate A .The isotope has a half -life T initially there are no nuclei ,after a times t>>T, the number of nuclei become constant .The value of this constant is

A quantity X is given by $ \varepsilon _{0} L =\frac{\Delta V}{\Delta t} $, where $e_0$ is the permittivity of free space, L is length, $\Delta V$ is potential difference and $\Delta t$ is time interval. The dimensional formula for X is the same as that of

Which one of the following can also act as a lubricant in the machines?

A proton is accelerating on a cyclotron having oscillating frequency of $11\, MHz$ in external magnetic field of $1 \,T$. If the radius of its dees is $55\, cm$, then its kinetic energy (in $MeV$) is $(m_{p}=1.67 \times 10^{-27} \, kg$, $e = 1.6 \times 10^{-19}\, C)$

A proton and an $\alpha$- particle enter in a uniform magnetic field perpendicularly with same speed. The ratio of time periods of both particle $\left(\frac{T_{p}}{T_{\alpha}}\right)$ will be

In projectile motion the modulus of rate of change of speed

In one dimensional motion, instantaneous speed $ v $ satisfies $ 0 \le v < v_0 $ .

Three uniform spheres, with masses $m_{A}=350\, kg , m_{B}=2000\, kg$, and $m_{C}=500 \,kg$ have the $( x , y )$ coordinates $(0,0) cm ,(-80,0) cm$ and $(40,0) cm$ respectively. The gravitational potential energy, $U$, of the system and change in its value in terms of increase or decrease, if the sphere of mass is removed, may be given as

An example to define length in the form of time at a place is

If three 10 uF capacitors are connected in parallel, the net capacitance is

Drift velocity of electrons is independent of time Electrons are accelerated in the presence of electric field

The probability of survival of a radioactive nucleus for one mean life is

What will happen to the weight of the body at the south pole, if the earth stops rotating about its polar axis?