List of top Physics Questions

A person is standing on a rotating table with metal spheres in his hands. If he withdraws his hands to his chest, then the effect on his angular velocity will be
A person in an elevator accelerating upwards with an acceleration of $2 \,m$ $s^{-2}$, tosses a coin vertically upwards with a speed of $20\, m$ $s^{-1}$. After how much time will the coin fall back into his hand? (Take$\, g=10\, m \,s^{-2}$)
The time period of oscillation of a simple pendulum is $T = 2\pi\sqrt{\frac{l}{g}}$. Measured value of $l$ is $10\, cm$ known to $1$ mm accuracy and time for $100$ oscillations of the pendulum is found to be $50 \,s$ using a wrist watch of Is resolution. What is the accuracy in the determination of $g$ ?
A particle starts moving from rest under uniform acceleration . In travels a distance 'x' in the first two second and a distance 'y' in the next two second. If y=nx, then n
A passenger in a moving train tosses a coin. If the coin falls behind him, the train must be moving with
A particle starting from rest moves upto $20\, s$ with constant acceleration. If $S _1$ is the distance covered in first $10\, s$ and $S_2$ is the distance covered in last $10$ second, then
A particle reaches its highest point at an instant of covering 1/2 of range. The corresponding position on displacement-time graph is characterised by.
A particle performs uniform circular motion with an angular momentum $L$. If the frequency of particle motion is doubled and its KE is halved the angular momentum becomes
A particle of mass m is attached to three identical massless springs of spring constant k as shown in the figure. The time period of vertical oscillation of the particle is .
A particle moves with uniform velocity. Which of the following statements about the motion of the particle is true ?
A particle of charge $q$ and mass $m$ is projected with a velocity $v_{0}$ towards a circular region having uniform Magnetic field $B$ perpendicular and into the plane of paper, from point $P$ as shown in figure. $R$ is the radius and $O$ is the centre of the circular region. If the line $OP$ makes an angle $\theta$ with the direction of $v_{0}$ then the value of $v_{0}$ so that particle passes through $O$ is
A particle moves rectilinearly. Its displacement $x$ at time $t$ is given by $x^2 = at^2 + b$ where $a$ and $b$ are constants. Its acceleration at time $t$ is proportional to
A particle moves in xy plane according to the law x = 4sin6t and y = 4(1 - cos6t). The distance traversed by the particle in 4 s is (x and y are in metres)
A particle moves in a straight line with retardation proportional to its displacement. Its loss of kinetic energy for any displacement $x$ is proportional to
A particle is projected with velocity $u$ inclined at an angle $\alpha$ with $x-axis$. Change in velocity of the particle on return to ground is
A particle is projected vertically upwards from a point A on the ground. It takes time $t_1$ to reach a point B, but it still continues to move up. If it takes further time $t_2$ to reach the ground from point B. Then height of point B from the ground is
A particle is projected from the origin in $xy$ plane. Acceleration of particle in $y$ direction is $\alpha$ . Its equation of path of projectile is $y = ax-bx^2$, then initial velocity of the particle is
A particle is projected from ground at an angle 45$^\circ$ with initial velocity $20\sqrt{2}ms^{-1}$. The magnitude of average velocity in a time interval from t = 0 to t = 3s in $ms^{-1}$ is.
A particle is moving on a circular path of radius $r$ with uniform speed $v$. What is the displacement of the particle after it has described an angle of $60^?$?
A particle is dropped from rest a large height, Assume $g$ to be constant throughout the motion. The time taken by it to fall through successive distances of $1\, m$ each will be
A particle experiences constant acceleration for 20 seconds after starting from rest. If it travels a distance $s_1$ in the first 10 seconds and distance $s_2$ in the next 10 seconds, then
A particle has a displacement of $12\,m$ towards east and $5\,m$ towards north and finally $6\,m$ vertically upwards. The sum of these displacement is
A particle falls towards earth from infinity. The velocity with which it reaches earth's surface is.
A parallel sides glass slab of thickness 4 cm is made of a material of refractive index $\sqrt{3}$ When light is incident on one of the parallel faces at an angle of 60, it emerges from the other parallel face. Then the lateral displacement of the emergent beam.
A parallel plate capacitor with plate area $A$ and separation between the plates $d$, is charged by a constant current $I$ .Consider a plane surface of area $A/2$ parallel to the plates and drawn between the plates. The displacement current through the area is