List of top Physics Questions

When charge is given to a soap bubble, it shows:
When a body is earth connected, electrons from the earth flow into the body. This means the body is .............
$v_{rms} , v_{av}$ 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?
Two forces of $12\,N $ and $8\,N$ act upon a body. The resultant force on the body has a maximum value of :
Three particles, each of mass $m$ gram, are situated at the vertices of an equilateral triangle $ABC$ of side $l$ cm (as shown in the figure). The moment of inertia of the system about a line $AX$ perpendicular to $AB$ and in the plane of $ABC$, in $gram-cm^2$ units will be
The temperature at which ferromagnetic material becomes paramagnetic is called a
The recoil velocity of a $ 4.0\, kg $ rifle that shoots a $ 0.050\, kg $ bullet at a speed of $ 280\text{ }m{{s}^{-1}} $ is:
The pressure maintained in Coolidge tube is:
The number of bullets are fired in all possible directions with the same initial velocity $u$. The maximum area of ground covered by bullets is :
The magnetic field due to a current carrying circular loop of radius $3\, cm$ at a point on the axis at a distance of $4\, cm$ from the centre is $54 \,\mu T$. What will be its value at the centre of the loop?
The magnetic field due to a straight conductor of uniform cross-section of radius a and carrying a steady current is represented by
The energy of a photon is equal to the kinetic energy of a proton. The energy of the photon is E. Let $ \lambda_1 $ be the de-Broglie wavelength of the proton and $ \lambda_2 $ be the wavelength of the photon. The ratio $ \frac{\lambda_1}{\lambda_2} $ is proportional to
The emitter-base junction of a transistor is ............. biased while the collector-base junction is ............. biased.
The electrostatic force between two charges of $10\,\mu C$ and $20\,\mu C$ at a distance of $2m$ is to be halved. This can be effected by
The direction of Lorentz force can be found by:
One solid sphere $A$ and another hollow sphere $B$ are of same mass and same outer radii. Their moment of inertia about their diameters are respectively $I_A$ and $I_B$ such that Where $d_A$ and $d_B$ are their densities
On a planet a freely falling body takes $2\,\sec$ when it is dropped from a height of $8\,m$ , the time period of simple pendulum of length $1\,m$ on that planet is:
The force constants of two springs are $ k_{1} $ and $ k_{2} $ respectively. Both are stretched till their potential energies are equal. The forces $ f_{1} $ and $ f_{2} $ applied on them are in the ratio
A body of mass $M$ is kept on a rough horizontal surface [friction coefficient $=u$). A person is trying to pull the body by applying a horizontal force $F$ but the body is not moving then
A bullet of mass $m$ moving with velocity $v$ strikes a block of mass $M$ at rest and gets embedded into it. The kinetic energy of the composite block will be
A body of mass $10 \,kg$ is moving with a constant velocity of $10 \,m/s$. When a constant force acts for $4 s$ on it, it moves with a velocity $2 \,m/s$ in the opposite direction. The acceleration produced in it is
A body of mass $0.5 \,kg$ is projected under gravity with a speed of $98 \,m/s$ at an angle of $ 60^{\circ} $ with the horizontal. The change in momentum (in magnitude) of the body is
In the case of horse pulling a cart, the force that causes the horse to move forward is the force that :
In a uniform magnetic field of induction B a wire in the form of semicircle of radius r rotates about the diameter of the circle with angular frequency $?$. The axis of rotation is perpendicular to the field. If the total resistance of the circuit is R the mean power generated per period of rotation is
In a triode valve, grid is used to control the plate current, because: