List of top Physics Questions

A square loop of copper wire is pulled through a region of uniform magnetic field as shown. Rank the pulling forces \(F_A\), \(F_B\), \(F_C\), and \(F_D\) that must be applied to keep the loop moving with constant speed (\(\vec{v}\)):

1 atm (Atmospheric Pressure) is equal to :

Which of the following statements are correct?
A. Photoelectric current depends on the intensity of light.
B. The stopping potential is directly related to the maximum kinetic energy of electrons emitted, which is dependent on the intensity of incident radiation.
C. Photoelectric emission from a metal surface occurs due to absorption of a photon by an electron.
D. Photoelectric effect follows the law of conservation of energy.

There is a thin conducting wire carrying current. The value of magnetic field induction at any point on the conductor would be:

Choose the correct statements from the following:
A. The minimum energy required to free the electron from the ground state of the hydrogen atom is 13.6 J
B. The principle quantum number n labels the stationary states in the ascending order of energy
C. Bohr gave the basic idea of discrete energy levels
D. de Broglie hypothesis provided an explanation for Bohr's second postulate for the quantization of angular momentum of the orbiting electron
E. line spectrum provides useful information about the atomic structure.
Choose the correct answer from the options given below:

What will be the energy released in the fusion process of two lighter nuclei of masses \( m_1 \) and \( m_2 \) into a nucleus of mass \( M \)?

Identify the graph from the following showing the temperature dependence of resistivity for a typical semiconductor?

A uniform magnetic field, parallel to the plane of the paper existed in space initially directed from left to right. When a bar of soft iron is placed in the field parallel to it, the lines of force passing through it will be represented by:

Two point charges +4µC and -2µC are placed at a certain distance in air. They experience an attractive force F. If they are brought in contact with each other and then separated to the same distance, the new repulsive force between them will be :

Two polaroid P₁ and P₃ are placed such that their pass-axis are mutually perpendicular. Another polaroid P₂ is rotated between P₁ and P₃. For what angle θ between P₁ and P₂ the intensity of light emerging from P₃ will be maximum?

Let us consider interference between two sources of intensities I and 4I. What will be the intensity at points where the phase difference is π?

Homi Jahangir Bhabha played an important role in the Discovery of ________

Ten capacitors each of 2 µF capacity were arranged in two rows such that first row contains 6 capacitors in series where as the rest were in second row. The equivalent capacitance of the network is:

The capacitance of capacitor increases when :
(A) its charge increases
(B) its supply voltage decreases
(C) common area of the plates increases
(D) separation between the plates decreases
Choose the correct answer

The electric field vector oscillates according to the equation \(\overrightarrow E = 4sin[1.8y +(5.4×10^6)t]\hat k\). The equation of magnetic field vector is:

A body oscillate with SHM according to equation (SI unit),
\(x= 10cos (2πt+π/4)\)
at t= 1.5 s, calculate the speed of the body.

A galvanometer having a resistance of 8Ω is shunted by a wire of resistance 2Ω. If the current is 1 A, the part of it passing through the shunt will be:

Match List I with List II

Choose the correct answer from the options given below:

An electric bulb has a filament made of _______

If three cells are connected in parallel as shown in figure, then equivalent emf would be:

In the figure, the potential difference between A and B is:

There are 4 electric bulb of 50W (each) is used for 5 hour per day. Calculate the energy consumed in the month of January.

Which one out of the following is not an application of eddy currents?

The charge which is a source of electric field but not of magnetic field is:

The mutual inductance M₁₂ of coil 1 with respect to coil 2: