List of top Physics Questions

A point mass $m$ is placed inside a spherical shell of radius $R$ and mass $M$ at a distance $\frac{R}{2}$ from the centre of the shell. The gravitational force exerted by the shell on the point mass is
A player throws a ball vertically upwards with velocity $u$. At highest point,
A plate of mass $m$, length $b$ and breadth $a$ is initially lying on a horizontal floor with length parallel to the floor and breadth perpendicular to the floor. The work done to exect it on its breadth is
A plane progressive wave is given by y= 2 cos 6.284(330 t - x). What is period of the wave?
A plane starts from rest with acceleration of $3\,ms^{-2}$ and makes a run for $35\, s$ before taking off. The minimum length of runway and velocity of plane at take off are respectively
A plane progressive wave has frequency 25 Hz and amplitude $2.5\times10^{-5}m$ and initial phase zero propagates along the negative x- direction with a velocity of 300 m/s. The phase difference between the oscillations at two points 6m apart along the line of propagation is
A plane mirror is approaching you at 10 cm/s You can see your image in it.The image will approach you with a speed of
A piece of solid weighs $120\, g$ in air, $80\, g$ in water and $60\, kg$ in a liquid. The relative density of the solid and that of the liquid are respectively
A plane is in level flight at constant speed and each of its two wings has an area of $ 25\, m^{2} $ . If the speed of the air on the upper and lower surfaces of the wing are $ 270\, km \,h^{-1} $ and $ 234 \,km\, h^{-1} $ respectively, then the mass of the plane is (Take the density of the air $ = 1 \,kg\, m^{-3} $ )
A plane electromagnetic wave propagating along $x$ direction can have the following pairs of $\vec{E}$ and $\vec{B}$
A person with normal near point $25\, cm$ using a compound microscope with objective of focal length $8.0\, mm$ and an eye piece of focal length $2.5\, cm$ can bring an object placed at $9.0\, mm$ from the objective in sharp focus. The separation between two lenses and magnification respectively are
A physical quantity $X$ is related to four measurable quantities $a$, $b$, $c$ and $d$ as given, $X = a^2b^3c^{5/2} \,d^{-2}$. The percentage error in the measurement of $a$, $b$, $c$ and d are $1\%$, $2\%$, $2\%$ and $4\%$ respectively. What is the percentage error in quantity $X$ ?
A person wants to see two pillars distant 11 km, separately. The distance between the pillars must be approximately.
A person sitting on the top of a tall building is dropping bails at regular intervals of one second. When the 6th ball is being dropped, the positions of the 3rd, 4th, 5th balls from the top of the building are respectively
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 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 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 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 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 with uniform velocity. Which of the following statements about the motion of the particle is true ?