List of top Physics Questions

Shown below is a distribution of charges. The flux of electric field due to these charges through the surfaces S is :

The displacement $ x $ of a body varies with time as $ x=-\frac{1}{3}{{t}^{2}}+16t+3 $ where $ x $ is in metre and t in second. The time taken by the body to come to rest is

Body accelerates from rest to 4 m/s, energy is E. If it accelerates from rest to 24, then energy is nE. Find n.

Acceleration of a particle is given by an equation, $a = 2 + 2t + 3t^2$ when $t$ is the time taken. If the particle starts at $t = 0$ with velocity $ 2 \,ms^{-1}$, then the velocity in $m s^{-1}$ at the end of $2 s$ is

Modulus of elasticity for a perfectly elastic body is

Hydrogen gas and oxygen gas have volume $1 cm^3$ each at NTP (i) Number of molecules is same in both the gases (ii) The rms velocity of molecules of both the gases is same (iii) The internal energy of each gas is same (iv) The average velocity of molecules of each gas is same The correct options are :

A grindstone has a moment of inertia of $6 \,kg\, m^2$. A constant torque is applied and the grindstone is found to have a speed of $150\, rpm, 10$ seconds after starting from rest. The torque is

The torque acting on a body about a given point is given by $ \tau = \overrightarrow{A} \times\overrightarrow{L} $ where $ \overrightarrow {A} $ is a constant vector and $ \overrightarrow {L} $ is the angular momentum of the body about this point. It follows that

A ray of light incident at an angle $\theta$ on a refracting face of a prism emerges from the other face normally. If the angle of the prism is $5^{\circ}$ and the prism is made of a material of refractive index $1.5$, the angle of incidence is

Two identical magnetic dipoles of magnetic moment $2\, A\, m^2$ are placed at a separation of $2\, m$ with their axes perpendicular to each other in air. The resultant magnetic field at a midpoint between the dipoles is

All ball of mass $ m_{1} $ collides elastically and head on with another ball of mass $ m_{2} $ initially at rest. In which of the following cases transfer of momentum will be maximum?

Gravitational acceleration on the surface of a planet is $\frac{\sqrt6}{11}g$ where g, is the gravitational acceleration oil the surface of the earth. The average mass density of the planet is 2/3 times that of the earth. If the escape speed on the surface of the earth is taken to be $11kms^{-1},$ the escape speed on the surface of the planet in $kms^{-1}$ will be

A synchronous relay satellite reflects TV signals and transmits TV programmer from one pan of the world to the other because its:

Capacity of a parallel plate capacitor increases when distance between the plates is decreased Capacitance of capacitor is inversely proportional to distance between them

$T$ is the time period of simple pendulum on the earth's surface Its time period becomes $x T$ when taken to a height $R$ (equal to earth's radius) above the earth's surface Then, the value of $x$ will be:

The direction of the flow of current through electric circuit is

The earth?? magnetic field always has a vertical component except at the

Two plane wavefronts of light, one incident on a thin convex lens and another on the refracting face of a term prism. After refraction at them, the emerging wavefronts respectively become

A charge is moving across a junction, then

In Young’s double-slit experiment using monochromatic light of wavelength \(λ\), the intensity of light at a point on the screen where path difference is \(λ\), is k units. What is the intensity of light at a point where path difference is \(\frac{λ }{3}\)?

A dip circle is taken to geomagnetic equator. The needle is allowed to move in a vertical plane perpendicular to the magnetic meridian. The needle will stay

Two bars ot copper having same length but unequal diameter are heated to the same temperature. The change in length will be

A slit of width a is illuminated by red light of wavelength $ 6500\, \overset{\text{o}}{\mathop{\text{A}}}\, $ . If the first minimum falls at $ \theta =30{}^\circ , $ the value of $ a $ is

The time period of rotation of the earth around its axis so that the at the objects at the equator become weightless is nearly $(g=9.8m/s^2)$,Radius of earth =6400 km.