List of top Physics Questions asked in OJEE

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:
A coil has resistance 20 Ω and inductance 0.35 H. Compute its impedance to an alternating current of 25 cycles/s.
The source of energy in the Sun is:
To generate energy, nuclear reactors use the principle of:
What back emf is induced in a coil of self-inductance 0.008 H when the current in the coil is changing at the rate of 110 A/s?
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 parallel-plate capacitor has plates of dimensions 2.0 cm by 3.0 cm separated by a 1.0 mm thickness of paper. The relative dielectric constant of paper is 3.7. Find its capacitance.
A triode valve has an anode resistance of 20,000 and an amplification factor of 20. The mutual conductance is:
The deviation produced by an equilateral prism, when a ray of light is incident on it, does not depend on:

Complete the following nuclear equation: \( \^{30}_{15}Si + ? \rightarrow ? + 1e^0 \)

Two coherent monochromatic light beams of intensity \( I \) and \( 4I \) are superimposed. The maximum and minimum possible intensities in the resulting beam are:
A concave lens forms the image of an object which 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:
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