List of top Physics Questions

If a vector 2î+3ĵ+8 is perpendicular to the vector 4ĵ-4î+α,then the value of α is:

Two batteries,one of emf 18 V and internal resistance 2Ω and the other of emf 12 V and internal resistance 1Ω, are connected as shown.The voltmeter V will record a reading of :

For the network shown in the figure, the value of the current i is:

Two uniform metal rods of lengths $ {{l}_{1}} $ and $ {{l}_{2}} $ and linear coefficients of expansion $ {{\alpha }_{1}} $ and $ {{\alpha }_{2}} $ respectively are connected to form a single rod of length $ ({{l}_{1}}+{{l}_{2}}). $ When the temperature of the combined rod is raised by t ?C, the length of each rod increases by the same amount. Then $ \left( \frac{{{\alpha }_{2}}}{{{\alpha }_{1}}+{{\alpha }_{2}}} \right) $ is:

A rifle shoots a bullet with a muzzle velocity of $ 500\,m{{s}^{-1}} $ at a small target 50 m away. To hit the target the rifle must be aimed: (Take $ g=10\,m{{s}^{-2}} $ )

A rigid container with thermally insulated walls contains a coil of resistance 100 $\Omega$, carrying current 1 A. Change in internal energy after 5 min will be

In an experiment with sonometer a tuning fork of frequency $256\, Hz$ resonates with a length of $25\, cm$ and another tuning fork resonates with a length of $16\, cm$. Tension of the string remaining constant the frequency of the second tuning fork is :

The ratio of velocity of sound in hydrogen and oxygen at STP is :

A particle on the trough of a wave at any instant will come to the mean position after a time : ($T =$ time period)

The relationship between the force $F$ and position $x$ of a body is as shown in figure. The work done in displacing the body from $x = 1 \, m $ to $x = 5 \, m$ will be :

Density of liquid in CGS system is $ 0.625\,g/cm^{3} $ What is its magnitude in SI system?

A network of four capacitors of capacity equal to C₁=C,C₂=2C,C₃=3C and C₄=4C are connected to a battery as shown in the figure. The ratio of the charges on C₂ an C₄ is

A ball of mass m moves with speed $v$ and it strikes normally with a wall and reflected back normally. If its time of contact with wall is $t$, then find force exerted by ball on the wall.

Three particles each of mass 1 kg are placed at the corners of a right angled triangle AOB, O being the origin of the coordinate system (OA and OB along positive X- direction and positive Y- direction). If OA=OB=1m, the positive vector of the centre of mass (in metres) is:

Two simple harmonic motions are represented by the equations $y_{1}=0.1\,sin\left(100\,\pi t+\frac{\pi}{3}\right)$ and $y_{2}=0.1\,cos\,\pi\,t.$ The phase difference of the velocity of particle 1, with respect to the velocity of particle 2 is :

When an unpolarized light of intensity $I_0$ is incident on a polarizing sheet, the intensity of the light which does not get transmitted is :

Two coherent sources of intensity ratio $ \beta $ interfere. Then the value of $ (I_{\max }-I_{\min })/(I_{\max }+I_{\min }) $ is:

If a transformer of an audio amplifier has output impedance 8000 0 and the speaker has input impedance of 80, the primary and secondary turns of this transformer connected

The ratio of the dimensions of Planck's constant and that of the moment of inertia is the dimension of:

The nuclei of which one of the following pairs of nuclei are isotones?

If a person sitting in a train moving with a constant velocity along a straight line, throws a ball vertically upwards then

Fission of nuclei is possible because the binding energy per nucleon in them:

The temperature of inversion of a thermocouple is 620°C and the neutral temperature is 300°C.what is the temperature of cold junction?

Two balls are projected simultaneously in the same vertical plane from the same point with velocities $ {{V}_{1}} $ and $ {{V}_{2}} $ with angles $ {{\theta }_{1}} $ and $ {{\theta }_{2}} $ respectively with the horizontal. If , the path of one ball as seen from the position of other ball is: