List of top Physics Questions

Three blocks of masses $m_1, m_2$ and $m_3$ are connected by massless strings as shown on a friction less table. They are pulled with a force of 40 N if $m_1$ = 10 kg, $m_2$ = 60 kg and $ m_3$ = 4 kg then tension $T_2$ will be
A solenoid of length 20 cm and radius 2 cm is closely wound with 200 turns. The magnetic field intensity at either end of the solenoid when the current in the winding is 5 amp. is

A parallel plate capacitor made of circular plates each of radius R = 6.0 cm has a capacitance C = 100 pF. The capacitor is connected to a 230 V ac supply with a (angular) frequency of 300 rad s−1.

  1. What is the rms value of the conduction current?
  2. Is the conduction current equal to the displacement current?
  3. Determine the amplitude of B at a point 3.0 cm from the axis between the plates.
A parallel plate capacitor made of circular plates
A circular disc is rotating about its own axis. An external opposing torque 0.02 Nm is applied on the disc by which it comes rest in 5 seconds. The initial angular momentum of disc is
Fig. 13.18 depicts four x-t plots for linear motion of a particle. Which of the plots represent periodic motion? What is the period of motion (in case of periodic motion) 
A disc of mass 100 g is kept floating horizontally in air by firing bullets, each of mass 5 g with the same velocity at the same rate of 10 bullets per second. The bullets rebound with the same speed in opposite direction, the velocity of each bullet at the time of impact is
A particle starts from origin at $t = 0$ with a velocity $5\hat{i}\,ms^{-1}$ and moves in $x$-$y$ plane under the action of a force which produces a constant acceleration of $3\hat{i}+2\hat{j}\,ms^{-2}$, the speed of the particle at this time is
In the following, the one which is not a physical quantity is

A system is shown in the figure. A man standing on the block is pulling the rope. The velocity of the point of string in contact with the hand of the man is 2 m/s downwards. The velocity of the block will be [assume that the block does not rotate]
A man standing on the block is pulling the rope

A body sliding on a frictionless track which terminates in a straight horizontal section CD. The body starts slipping from A and reaches point D. If h1 = 1 m, then how far from point D, will the body hit the ground?Take, g = 10 ms-2.
One end of a cylindrical glass rod ($\mu$ = 1.5) is given the shape of a concave refracting surface of radius 10 cm. An air bubble is situated in the glass rod at.a .point on its axis such that it appears to be at distance 10 cm from the surface and inside glass when seen from the other medium. The actual location of air bubble is
Two particles $ A $ and $ B $ are projected with same speed so that the ratio of their maximum heights reached is $ 3:1 $ . If the speed of $ A $ is doubled without altering other parameters, the ratio of the horizontal ranges attained by $ A $ and $ B $ is
An electric charge $10^{-3} \mu C$ is placed at the origin $(0,0)$ of $X-Y$ coordinate system. Two points $A$ and $B$ are situated at $(\sqrt{2}, \sqrt{2})$ and $(2,0)$ respectively. The potential difference between the points $A$ and $B$ will be
The dielectric constant of an insulator cannot be :
If the radius of earth shrinks by 0.2% without change in its mass, the % change in its angular velocity is
Two forces in the ratio 1 : 2 act simultaneously on a particle. The resultant of these forces is three times the first force. The angle between them is

A galvanometer has a resistance of 96 Ω  and it is desired to pass 4% of the total current through it. The value of shunt resistance is ____?

A man (mass = 50 kg) is in an elevator with is moving with acceleration 0.49 m/s2 upwards. Find normal reaction exerted by man on floor of the elevator
The earth revolves around the sun in one year. If distance between them becomes double, the new time period of revolution will be
A closely wound solenoid of \(2000 \) turns and area of cross-section \(1.6 × 10^{-4}\  m^2\), carrying a current of \(4.0 \ A\), is suspended through its centre allowing it to turn in a horizontal plane. 
(a) What is the magnetic moment associated with the solenoid?
(b) What is the force and torque on the solenoid if a uniform horizontal magnetic field of \(7.5 × 10^{-2}\  T\) is set up at an angle of \(30º\) with the axis of the solenoid?
Velocity of sound in vacuum is
The variation of speed (in m/s) of an object with time (in seconds) is given by the expression $V(t) = V_0 - 5t + 5t^2$
A sphere of mass m moving with constant velocity hits another stationary sphere of the same mass. If e is the coefficient of restitution, aid the ratio of velocities of the two spheres after die collision will be
A point source emits sound equally in all directions in a non-absorbing medium. Two points P and Q are at distance of 2m and 3m respectively from the source. The ratio of the intensities of the waves at P and Q is :
A gas is kept in a vessel of volume 0.2 m3 at temperature 300 K and pressure 1 bar. The molar heat capacity of gas at constant volume is 5 cal/mol K. The heat (kcal) required to raise the temperature to 400 K is ______.