List of top Physics Questions

As shown in the figure, a particle of mass 10 kg is placed at a point A. When the particle is slightly displaced to its right, it starts moving and reaches the point B. The speed of the particle at B is x m/s. (Take g = 10 m/s²) The value of 'x' to the nearest integer is __________. [Note: Usually $h_A = 10$m and $h_B = 5$m in this problem]

A particle performs simple harmonic motion with a period of 2 second. The time taken by the particle to cover a displacement equal to half of its amplitude from the mean position is 1/a s. The value of 'a' to the nearest integer is __________.

The circuit shown in the figure consists of a charged capacitor of capacity 3 µF and a charge of 30 µC. At time t=0, when the key is closed, the value of current flowing through the 5 MΩ resistor is 'x' µA. The value of 'x' to the nearest integer is __________.

A person is swimming with a speed of 10 m/s at an angle of 120° with the flow and reaches to a point directly opposite on the other side of the river. The speed of the flow is 'x' m/s. The value of 'x' to the nearest integer is __________.

Two separate wires A and B are stretched by 2 mm and 4 mm respectively, when they are subjected to a force of 2 N. Assume that both the wires are made up of same material and the radius of wire B is 4 times that of the radius of wire A. The length of the wires A and B are in the ratio of a : b. Then a/b can be expressed as 1/x where x is __________.

A parallel plate capacitor has plate area 100 m² and plate separation of 10 m. The space between the plates is filled up to a thickness 5 m with a material of dielectric constant of 10. The resultant capacitance of the system is 'x' pF. The value of ε₀ = 8.85 × 10⁻¹² F m⁻¹. The value of 'x' to the nearest integer is __________.

A bullet of mass 0.1 kg is fired on a wooden block to pierce through it, but it stops after moving a distance of 50 cm into it. If the velocity of bullet before hitting the wood is 10 m/s and it slows down with uniform deceleration, then the magnitude of effective retarding force on the bullet is 'x' N. The value of 'x' to the nearest integer is __________.

The period of oscillation of a simple pendulum is $T = 2\pi \sqrt{\frac{L}{g}}$. Measured value of 'L' is 1.0 m from meter scale having a minimum division of 1 mm and time of one complete oscillation is 1.95 s measured from stopwatch of 0.01 s resolution. The percentage error in the determination of 'g' will be :

A circular hole of radius $\left(\frac{a}{2}\right)$ is cut out of a circular disc of radius 'a' as shown in figure. The centroid of the remaining circular portion with respect to point 'O' will be :

If one mole of an ideal gas at $(P_1, V_1)$ is allowed to expand reversibly and isothermally (A to B) its pressure is reduced to one-half of the original pressure. This is followed by a constant volume cooling till its pressure is reduced to one-fourth of the initial value (B → C). Then it is restored to its initial state by a reversible adiabatic compression (C to A). The net work done by the gas is equal to :

In the given figure, a body of mass M is held between two massless springs, on a smooth inclined plane. If each spring has spring constant k, the frequency of oscillation of given body is :

When a particle executes SHM, the nature of graphical representation of velocity as a function of displacement is :

Which of the following equations represents a travelling wave ?

Two electrons each are fixed at a distance '2d'. A third charge proton placed at the midpoint is displaced slightly by a distance x (x << d) perpendicular to the line joining the two fixed charges. Proton will execute simple harmonic motion having angular frequency : (m = mass of charged particle)

Match List - I with List - II.

If the source of light used in a Young's double slit experiment is changed from red to violet :

An X-ray tube is operated at 1.24 million volt. The shortest wavelength of the produced photon will be :

The de Broglie wavelength of a proton and α-particle are equal. The ratio of their velocities is :

According to Bohr atom model, in which of the following transitions will the frequency be maximum ?

Two solids A and B of mass 1 kg and 2 kg respectively are moving with equal linear momentum. The ratio of their kinetic energies (K.E.)A : (K.E.)B will be A/1, so the value of A will be ______

A uniform thin bar of mass 6 kg and length 2.4 meter is bent to make an equilateral hexagon. The moment of inertia about an axis passing through the centre of mass and perpendicular to the plane of hexagon is __________ x 10\^{-1} kg m².

The root mean square speed of molecules of a given mass of a gas at 27°C and 1 atmosphere pressure is 200 m s⁻¹. The root mean square speed of molecules of the gas at 127°C and 2 atmosphere pressure is $ \dfrac{x}{\sqrt{3}} $ m s⁻¹. The value of $ x $ will be __________.

A point charge of +12 µC is at a distance 6 cm vertically above the centre of a square of side 12 cm. The magnitude of the electric flux through the square will be ________ × 10³ Nm²/C.

A cylindrical wire of radius 0.5 mm and conductivity $5 \times 10^7$ S/m is subjected to an electric field of 10 mV/m. The expected value of current in the wire will be $x^3 \pi$ mA. The value of $x$ is ______.

A series LCR circuit is designed to resonate at an angular frequency $ \omega_0 = 10^5 $ rad/s. The circuit draws 16 W power from a 120 V source at resonance. The value of resistance $ R $ in the circuit is _____ Ω.