List of top Physics Questions

As shown in the figure, a light uniform rod PQ of length 150 cm is suspended from the ceiling horizontally using two metal wires A and B tied to the ends of the rod. The ratios of the radii and the Young’s modulus of the materials of the two wires A and B are respectively 2 : 3 and 3 : 2. The position at which a weight should be suspended from the rod such that the elongations of the two wires become equal is
light uniform rod PQ of length 150 cm is suspended
If water flows with a velocity of 20 cm/s in a pipe of radius 2 cm, then the flow is (The coefficient of viscosity of water is \(10^{-3} \, \mathrm{kg\,m^{-1}s^{-1}}\) and density of water is \(10^{3} \, \mathrm{kg\,m^{-3}}\))
The angular frequency of a block of mass 0.1 kg oscillating with the help of a spring of force constant 2.5 N m\(^{-1}\) is:
If the displacement \( y \) (in cm) of a particle executing simple harmonic motion is given by the equation: \[ y = 5 \sin(3 \pi t) + 5 \sqrt{3} \cos(3 \pi t) \] then the amplitude of the particle is:
According to Zeroth Law of Thermodynamics, the physical quantity which is same for two bodies in thermal equilibrium is
As shown in the figure, a force $F$ is applied on a block of mass $\frac{\sqrt{3}}{2}$ kg placed on a rough horizontal surface. The maximum value of $F$ for the block not to move is (coefficient of static friction between the block and the surface is $\frac{1}{2\sqrt{3}}$ and acceleration due to gravity = 10 m s$^{-2}$)
a force F is applied on a block of mass
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If a wheel starting from rest is rotating with an angular acceleration of $\pi$ rad s$^{-2}$, then the number of rotations made by the wheel in the 6th second is
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If the radius of gyration of a thin circular ring about an axis passing through its centre and perpendicular to its plane is $10\sqrt{2}$ cm, then its radius about its diameter is
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The power required for an engine to maintain a constant speed of 50 m s$^{-1}$ for a train of mass 3 $\times$ 10$^5$ kg on rough rails is (the coefficient of kinetic friction between the rails and wheels of the train is 0.05 and acceleration due to gravity = 10 m s$^{-2}$)
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A person holds a ball of mass 0.25 kg in his hand and throws it, so that it leaves his hand with a speed of 12 m s$^{-1}$. In the process, if his hand moved through a distance of 0.9 m, then the net force acted on the ball is
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If bullets are fired in all possible directions from same point with equal velocity of 10 m s$^{-1}$ and an angle of projection 45$^\circ$, then the area covered by the bullets on the ground nearby (acceleration due to gravity 10 m s$^{-2}$) is
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If a car travels 40% of the total distance with a speed $v_1$, then the remaining distance with the car is
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A ball is projected from a point with a speed $v$, at a certain angle with the horizontal. From the same point and at the same instant, a person starts running with a constant speed $0.5v$, to catch the ball. If the person catches the ball after some time, then the angle of projection of the ball is
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The heights of the transmitting and receiving antennas are respectively $\frac{1}{2000}$ and $\frac{1}{5000}$ times the radius of the Earth. The maximum distance between these two antennas for satisfactory communication in line of sight is}
(Radius of the Earth = 6.4 $\times 10^6$ m)
At absolute zero temperature, an intrinsic semiconductor behaves as
If the half-life of a radioactive material is 10 years, then the percentage of the material decayed in 30 years is
The minimum wavelength of X-rays produced by 20 keV electrons is nearly
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
In a solenoid, if the current of 15 A passes through the solenoid of length 25 cm, radius 2 cm, and number of turns 500, then the magnetic moment of the solenoid is
Two moving coil galvanometers A and B having identical springs are placed in magnetic fields of 0.25 T and 0.5 T respectively. If the number of turns in A and B are 36 and 48, the areas of the coils A and B are 2.4 $\times 10^{-3}$ m$^2$ and 4.8 $\times 10^{-3}$ m$^2$ respectively, then the ratio of the current sensitivities of the galvanometers A and B is
When photons of energy 8 $\times 10^{-19}$ J incident on a photosensitive material, the work function of the photosensitive material is nearly 10 eV, then the maximum kinetic energy of the photoelectrons emitted is
(1) 3.5 eV
(2) 2.5 eV
(3) 2.0 eV
(4) 1.0 eV
The self-inductance of an air-cored solenoid of length 40 cm, diameter 7 cm having 200 turns is
The maximum magnetic field produced by a current of 12 A passing through a copper wire of diameter 1.2 mm is
If the magnetic field in a plane progressive wave is represented by the equation $B = 2 \times 10^{-8} \sin (0.5 \times 10^3 t + 1.5 \times 10^4 x)$ T, then the frequency of the wave is
If a dielectric slab of dielectric constant 3 is introduced between the plates of a capacitor having electric field $1.5\, N/C$, then the electric displacement is