List of top Physics Questions

Maximum and minimum values of the resultant of two forces acting at a point are $7\, N$ and $3\, N$ respectively. Then smaller force is equal to
The focal length of a plano convex lens is equal to its radius of curvature. The value of the refractive index of its material is
The normal magnifying power of a simple microscope is 6. The focal length of the convex lens uses is
Which of the following statement is correct?
Magnetic field due to a long straight conductor of length, carrying current at a point distance from it, is given by
The refractive index of water is 1.33. What will be the speed of light in water?
What will be the equivalent resistance between the two points A and D?
Suppose a tunnel is dug along the diameter of earth. A particle is dropped from a point at a distance $h$ directly above the tunnel. The earth's density is assumed uniform and the friction is neglected, then
A \(10\ eV\) electron is circulating in a plane at right angles to a uniform field at magnetic induction \({10}^{- 4}\ Wb/m^2\) (= \(1.0\) gauss), the orbital radius of electron is
A body dropped from a height h with initial velocity zero, strikes the ground with a velocity 3 m/s. Another body of same mass dropped from the same height h with an initial velocity of 4 m/s. The final velocity of second mass, with which it strikes the ground is
The energy stored in a capacitor of capacity C and potential V is given by
The dimensions of impulse are equal to that of
If a convex lens of focal length 80 cm and a concave lens of focal length 50 cm are combined together, what will be their resulting power?
A beam of electrons is moving with constant velocity in a region having electric and magnetic fields of strength $ 20 V m^{-1} $ and 0.5 T at right angles to the direction of motion of the electrons. What is the velocity of the electrons?
Which of the following dimensions will be the same as that of time?
A point charge + q is placed at the centre of a cube of side $l$. The electric flux emerging from the cube is
A linear harmonic oscillator of force constant $ 2 \times 10^6 $ N/m and amplitude 0.01 m has a total mechanical energy of 160 J. Show that its (a) maximum potential energy is 160 J (b) maximum kinetic energy is 100J
Two equal electric currents are flowing perpendicular to each other as shown in the figure. AB and CD are perpendicular to each other and symmetrically placed with respect to the currents. Where do we expect the resultant magnetic field to be zero?
A moving body of mass $m$ and velocity $3\, km / hr$. Collides with a body at rest and of mass $2\, m$ and then sticks to it. Now the combined mass starts to move, then the combined velocity will be :
When npn transistor is used as an amplifier, then
A man fires a bullet of mass $200\,gm$ at a speed of $5\,m/s$. The gun is of one $kg$ mass. By what velocity the gun rebounds backward?
What will be the formula of mass of the earth in terms of g, R and G ?
A ball is dropped from a spacecraft revolving around the earth at a height of 120 km. What will happen to the ball?
The density of the material of a cube can be estimated by measuring its mass and the length of one of its sides. If the maximum error in the measurement of mass and length are 0.3% and 0.2% respectively, the maximum error in the estimation of the density of the cube is approximately
An electron of mass m and charge e is accelerated from rest through a potential difference V in vacuum. Its final velocity will be