List of top Physics Questions

A body of mass m, accelerates uniformly from rest to $v_1$ in time $t_1$. The instantaneous power delivered to the body as a function of time t is

At the time of total solar eclipse, the spectrum of solar radiation will have

For formation of permanent magnets, the material should have:

Eddy currents are produced in:

Which scientist experimentally proved the existance of electromagnetic waves?

What are the units of $K = 1/4 \pi \varepsilon_{0}? $

A boat of mass $40\, kg$ is at rest. A dog of mass $4 \,kg$ moves in the boat with a velocity of $10\, m/s$. What is the velocity of boat?

$v_{rms}, v_{av} $ and $v_{mp}$ are root mean square, average and most probable speeds of molecules of a gas obeying Maxwellian velocity distribution. Which of the following statements is correct?

Drift velocity varies with the velocity of electric field as per the relation

At the time of total solar eclipse, the spectrum of solar radiation will have :

The effective acceleration of a body, when thrown upwards with acceleration $ a $ will be:

The temperature $(T )$ dependence of resistivity $(r)$ of a semiconductor is represented by

Sodium lamps are used in foggy conditions because

A circular coil of radius $R$ carries an electric current. The magnetic field due to the coil at a point on the axis of the coil located at a distance $r$ from the center of the coil, such that $r > > R$, varies as

A sphere of mass $M$ and radius $R$ is falling in a viscous fluid. The terminal velocity attained by the falling object will be proportional to

A proton and an $\alpha$ - particle, moving with the same velocity, enter into a uniform magnetic field, acting normal to the plane of their motion. The ratio of the radii of the circular paths described by the proton and $\alpha$ - particle is

Two long conductors, separated by a distance d carry current $I_1$ and $I_2$ in the same direction. They exert a force $F$ on each other. Now the current in one of them increased to two times and its direction reversed. The distance is also increased to $3d$. The new value of the force between them is

In a step-up transformer ratio of number of turns in primary to seconday coil is $1: 25 .$ If input voltage is $230$ volt and load current is $2 \,amp$, then current in primary is :

For a transistor amplifier in common emitter configuration having load impedance of $1\, kO$ ($h_{fe} = 50$ and $h_{oe} = 25$) the current gain is

When the glancing angle of incidence of light on a material is 30$^\circ$, the reflected and refracted light are found to be perpendicular. The refractive index of material is

Two waves having intensity ratio 25 : 4 produce interference. The ratio of maximum to minima intensity is

Two vectors have magnitudes 3 and 5. If angle between them is 60$^{\circ}$, then the dot product of two vectors will be

The volume of a metal sphere increases by $ \text{0}\text{.15 }\!\!%\!\!\text{ } $ when its temperature is raised by $ \text{24}{{\,}^{\text{o}}}\text{C}\text{.} $ The coefficient of linear expansion of metal is:

The relative permeability of iron is $6000$. Its magnetic susceptibility is