List of top Physics Questions

A transistor has 3 impurity regions of different doping levels. In the order of increasing doping level, the regions are
For transmitting a signal of frequency 1000 kHz, the minimum length of the antenna is
A solid of mass 1 kg has \(6 \times 10^{24}\) atoms. If one electron is removed from every one atom of 0.005% of the atoms, then the charge gained by the solid is
If a particle is moving along a circle of radius \( r \) with constant speed \( v \), then the magnitude of the change in velocity when the particle moves from \( P \) to \( Q \), where \( PQ \) makes an angle \( \theta \) at the center of the circle is:
A vector perpendicular to the vector $\left(4\hat{i} - 3\hat{j}\right)$ is
The energy stored in a coil of inductance 50 mH carrying a current of 2 A is:
To get an output value $ 1 $ from the given circuit, the input values of $ A $, $ B $, and $ C $ are:
output value 1 from the given circuit,
A 10 $\mu$C charge is placed at the vertex A of an equilateral triangle ABC of side 2 m. The work done in taking another charge $(3 + \sqrt{3})$ $\mu$C from the mid point of BC to the mid point of the side AC is:
If the error in the measurement of the surface area of a sphere is 1.2%, then the error in the determination of the volume of the sphere is
If a ball projected vertically upwards with certain initial velocity from the ground crosses a point at a height of 25 m twice in a time interval of 4 s, then the initial velocity of the ball is
(Acceleration due to gravity $= 10~\text{m/s}^2$)
Two capacitors of capacitances \( 4 \, \mu\text{F} \) and \( 6 \, \mu\text{F} \) are connected in series across a potential difference of \( 300 \, \text{V} \). What is the potential difference across the \( 4 \, \mu\text{F} \) capacitor?
A concave mirror forms an image at twice the focal length from the mirror. What is the nature and size of the image compared to the object?
If the ratio of the maximum and minimum amplitudes of an amplitude modulated wave is 7:3, then the modulation index is
If the amplitude of electric field vector and frequency of an electromagnetic wave travelling along $z$-direction in vacuum are 180 N C$^{-1}$ and 60 GHz respectively, then the equation of the magnitude of the electric field of the plane electromagnetic wave is
As shown in the figure, if the values of the electric potential at three points A, B and C in a uniform electric field (\( \vec{E} \)) are \(V_A\), \(V_B\), and \(V_C\) respectively, then
electric potential at three points A, B and C
A bomb of mass 12 kg at rest explodes into two pieces of masses 4 kg and 8 kg. If the velocity of 8 kg mass is \( 6\,{ms}^{-1} \), then the kinetic energy of 4 kg mass is
As shown in the figure, the work done to move the charge 'Q' from point C to point D along the semi-circle CRD is
work done to move the charge ’Q’ from point C to point D
The de Broglie wavelength associated with an electron accelerated through a potential difference of \( \frac{200}{3} \ \text{V} \) is nearly
A balloon with mass 'm' is descending vertically with an acceleration 'a' (where a \(<\) g). The mass to be removed from the balloon, so that it starts moving vertically up with an acceleration 'a' is
If 2 moles of an ideal monoatomic gas at a temperature of 27 °C is mixed with 4 moles of another ideal monoatomic gas at a temperature of 327 °C, then the temperature of the mixture of the two gases is
A coil of inductive reactance $\frac{1}{\sqrt{3}} \Omega$ and a resistance 1 $\Omega$ are connected in series to a 200 V, 50 Hz ac source. The time lag between voltage and current is
If current of 80 A is passing through a straight conductor of length 10 m, then the total momentum of electrons in the conductor is (mass of electron \( = 9.1 \times 10^{-31} \) kg and charge of electron \( = 1.6 \times 10^{-19} \) C)
The speed of a stationary wave represented by the equation $y = 0.75 \sin\left(\dfrac{7\pi}{4}x\right)\cos(350\pi t)$ is
To increase the RMS speed of gas molecules by 25%, the percentage increase in absolute temperature of the gas is to be

The ratio of the currents i$_1$, i$_2$ and i$_3$ in the circuit is: