List of top Physics Questions asked in OJEE

If a copper wire carries a current of 80.0 mA, how many electrons flow past a given cross-section of the wire in 10.0 minutes?
A battery of 10 V and internal resistance 0.5 Ω is connected in parallel with a battery of 12 V and internal resistance 0.8 Ω. The terminals are connected by an external resistance of 20 Ω. The current flowing through the 20 Ω resistance is:
Current \( I \) flows through a conducting wire of radius \( a \). The magnetic field \( B \) at a distance \( r \) from the centre of the wire (where \( r>a \) and \( \mu \) is the permeability of free space) is:
A concave lens forms the image of an object which is:
If the speed of sound in air at 0°C is 331 m/s, the speed of sound in air at 35°C is:
In a stationary wave all the particies
Angle between wave velocity and particle velocity of a longitudinal wave is
An observer moves towards a stationary source of sound with a velocity that is one-fifth the velocity of sound. The apparent change in frequency is
A light ray going from air is incident (as shown in figure) at one end of a glass fibre (refractive index $ \mu = 1.5$) making an incidence angle of $60^\circ$ on the lateral surface,
so that it undergoes a total internal reflection. How much time would it take to traverse the straight fibre of length 1 km?
A particle of mass $2 \times 10^{-3}$ kg, charge $4 \times 10^{-3}$ C enters in an electric field of 5 V/m, then its kinetic energy after 10 s is
Charge $Q$ is distributed over a ring, then the force on charge $q$ placed at the centre of the ring will be
The figure shows some of the electric field lines corresponding to an electric field, The figure suggests
The distance between two charges $6\,\mu\,C$ and $15\,\mu\,C$ is $2\,m$. At what point on the line joining the two, the intensity will be zero?
The effective capacitance between $A$ and $B$ is
A luminous body radiates energy at a rate $3.6 \times 10^{28}$ J/s, then loss of mass of the body per second is
The equation of a particle executing SHM is $\frac{2d^2x}{dt^2}+32x=0$Then the time period of the body is
The effective resistance between points A and C for the network shown in figure is
Sphygmomanometer is an instrument used to record
$ C_v $ for $O_2 $ is $\frac{ 5}{2} $ R with increase in temperature it becomes $ \frac{ 7}{2} $ R due to a
Average velocity of an ideal gas molecule is
Application of a forward bias to a p-n junction
The figure shows graphs of pressure versus density for an ideal gas at two temperatures $T_1$ and $ T_2$, then
The resistance of a wire is 24$O$. lt is so stretched that the length becomes four times, then the new resistance of wire will be
When white light passes through a glass prism, one gets spectrum on the other side of the prism. In the emergent beam, the ray which is deviating least is
Three electric bulbs of $200\, W, 200 \,W$ and $400\, W$ are shown in figure. The resultant power of the combination is