List of top Physics Questions

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
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?
The dimensions of impulse are equal to that of
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
A motor
At the mid point along the length of a long solenoid, the magnetic field is equal to x. If the length of the solenoid is doubled and the current is reduced to half, the field at the new mid point will be nearest to
$1000$ drops of water of radius $1\,cm$ each carrying a charge of $10\, esu$ combine to form a single drop. The capacitance of combined drop increases
Two parallel wires carry electric current in same direction. The wires
In India electricity is supplied for domestic use at $220\, V$. It is supplied at $110 \,V$ in USA. If the resistance of a $60 \,W$ bulb for use in India is $R$, the resistance of a $60 \,W$ bulb for use in USA will be
An example of a non ohmic device is
A particle starts with S.H.M. from the mean position as shown in the figure. Its amplitude is $A$ and its time period is $T$. At one time, its speed is half that of the maximum speed. What is this displacement?
Resistance of an ideal ammeter is
A red flower seen through a green glass looks
Four resistors of $100\,\Omega$ each are connected in the form of a square. Then the effective resistance along the diagonal point is