List of top Physics Questions

A 100 W light bulb is connected to a 220 V power supply. Find the current flowing through the bulb.
In a p-n junction diode, if the forward bias voltage is increased, how does the current flowing through the diode change?
A car accelerates from rest with a constant acceleration of \( 2 \, \text{m/s}^2 \) for 5 seconds. Find the final velocity of the car.
A 1.0 kg object is dropped from a height of 5 meters. Calculate the velocity of the object just before it hits the ground. (Assume no air resistance and \( g = 9.8 \, \text{m/s}^2 \))
A metal wire has a length of 2 meters and a resistance of \( 10 \, \Omega \). If the length of the wire is doubled, while keeping the material and cross-sectional area the same, what will be the new resistance?
A ball is thrown vertically upwards with an initial speed of 10 m/s. Calculate the maximum height reached by the ball. (Assume \( g = 9.8 \, \text{m/s}^2 \))
Two chairs (A and B) are in an empty room overnight. Chair A is made of steel while chair B is made of wood. In the night and in the morning, the temperature of the room is 290 K. In the morning, a person chooses between Chair A and Chair B as the seat by feeling (touching) the chair and choosing one which feels warmer. 
Person chooses __ (BLANK-1) __ as it feels warmer because __ (BLANK-2)___ has __(BLANK-3)___ ___ (BLANK-4)____ than ___(BLANK-5)___ .
The ratio of molar specific heats of oxygen is
The figure shows variation of R,XL and XC with frequency ' f ' in a series LCR circuit. Then for what frequency point is the circuit capacitive?
LCR circuit
In the figure, a conducting ring of certain resistance is falling towards a current carrying straight long conductor. The ring and conductor are in the same plane. Then the
a conducting ring of certain resistance
In alpha particle scattering experiment, if v is the initial velocity of the particle, then the distance of closest approach is d. If the velocity is doubled, then the distance of closest approach becomes
Electromagnetic waves are incident normally on a perfectly reflecting surface having surface area A. If I is the intensity of the incident electromagnetic radiation and c is the speed of light in vacuum, the force exerted by the electromagnetic wave on the reflecting surface is
A p -n junction diode is connected to a battery of emf 5.7 V in series with a resistant 5kΩ such that it is forward biased. If the barrier potential of the diode is 0.7 V, neglecting the diode resistance, the current in the circuit is
The natural logarithm of the activity R of a radioactive sample varies with time t as shown. At t=0, there are N0 undecayed nuclei. Then N0 is equal to [Take e2= 7.5]
A particle of mass 500 g is at rest. It is free to move along a straight line. The power delivered to the particle varies with time according to the following graph :
The momentum of the particle at t=5s is
In the circuit shown, the end A is at potential V0 and end B is grounded. The electric current I indicated in the circuit is
the end A is at potential V0 and end B is grounded
A body has a charge of -3.2μC . The number of excess electrons it has is
A coil having 9 turns carrying a current produces magnetic filed B1 at the centre. Now the coil is rewounded into 3 turns carrying same current. Then the magnetic field at the centre B2=
A uniform electric field E-3×105NC-1 is acting along the positive Y-axis. The electric flux through a rectangle of area 10cm × 30 cm whose plane is parallel to the Z-X plane is
A point charge A of +10µC and another point charge B of +20µC are kept Im apart in free space. The electrostatic force on A due to B is \(\overrightarrow{F_1}\), and the electrostatic force on B due to A is \(\overrightarrow{F_2}\). Then
Consider the nuclear fission re action  Assuming all the kinetic energy is carried away by the fast neutrons only
and total binding energies of    MeV and 780 MeV respectively, the average kinetic energy
carried by each fast neutron is (in MeV)
Which of the following logic gates produces a LOW output when a HIGH input is applied?
A galaxy is moving away from the Earth so that a spectral line at 600 nm is observed at 601 nm . Then the speed of the galaxy with respect to the Earth is
Light of energy E falls normally on a metal of work function \(\frac{E}{3} \). The kinetic energies (K) of the photo electrons are
A block of mass m is connected to one end of a spring of spring constant k. The other end of the spring is fixed to a rigid support. Tile mass is released slowly so that the total energy of the system is then constituted by only the potential energy, then d is the maximum extension of the spring. Instead, if the mass is released suddenly from the same initial position, the maximum extension of the spring now is (g = acceleration due to gravity)