List of top Physics Questions

If the area of cross-section is halved and length of a wire having Young's modulus Y is doubled, then its new Young's modulus will be

Find the current through Zener diode if its breakdown voltage is 5 V.

In \(AC\) circuit with source voltage \(E \) = \(20\) \(sin\; 1000 \;t\) is connected to series \(L-R\) circuit whose power factor is \(\frac{1}{\sqrt 2}\) If \(E = 25\) \(sin \;2000\) \(t\), the new power factor is :

With rise in temperature the young's modulus of elasticity

If the rms velocity of hydrogen gas molecules is \(V_o\), find the rms velocity of oxygen molecules at same temperature :

Three identical spheres each of mass M are placed at the corners of a right angled triangle with mutually perpendicular sides equal to 3 m each. Taking point of intersection of mutually perpendicular sides as origin, the magnitude of position vector of centre of mass of the system will be √x m. The value of x is _______ .

In YDSE, intensity at two sources are in ratio of \(1: 9\). if source are incoherent then intensity at central point is \(I_1\), and if sources are coherent (and phase differs by \(60°\)) then intensity at central point is \(12\) then \(\frac{I_1}{I_2}\) is

De Broglie wavelength of proton = \(λ\) and that of an a particle \(2λ\). The ratio of velocity of proton to that of \(\alpha\) particle is 

Find percentage change in capacitance if potential difference across it has been changed from V to 2V.

In the figure shown, find the ratio of tensions in the strings, \(\frac{T_1}{T_2}\)

The Pressure (P) versus volume (V) of thermodynamic process shown in figure. The select the correct options (Take γ= 1.1)

solid sphere is rolling purely with speed v on horizontal surface. It rolls up an incline surface and stops at height h. Then height h is [g is the acceleration due to gravity]:

A particle performing simple harmonic motion is such that its amplitude is 4 m and speed of particle at mean position is 10 m/s. Find the distance of particle from mean position where velocity becomes 5 m/s.

Calculate the average energy density of an electromagnetic wave whose electric field is oscillating with amplitude \(50 \;V/m\) and frequency \(5 \times10^{10}\) \(Hz\) :

In single electron \(atom/ion\), first member of Lyman series is \(λ\), then wavelength of second member of their series shall be

Output of given circuit represents which logic gate :

The fundamental frequency of closed organ pipe is equal to the frequency of first overtone of open organ pipe of length 60 cm. The length of closed organ pipe is

For a \(1-D\) motion, relation between position x and time \(t\) is \(t = αx^2 + βx\) Find the relation between velocity \(v\) and acceleration \(a\).

Stopping potential is \(8\) \(V\) if wavelength of incident light is \(λ\) and it is \(2\) \(V\) for \(3λ\). Find threshold wavelength.

The speed of sound in oxygen in STP will be approximately? Given that \(R=8.3 \) and \(y=1.4\)

A boy can throw a stone up to a maximum height of 10 m. The maximum horizontal distance that the boy can throw the same stone will be?

If the power of a light source is P and frequency of photons emitted is f. Find number photons emitted in time t.

Statement 1: Positive zero error is added in measured value.
Statement 2: Defect may occur during manufacturing of measuring instruments