List of top Physics Questions

A proton, a deuteron, an electron, and an \(\alpha\)-particle have the same energy. Their deBroglie wavelengths are \( \lambda_p \), \( \lambda_d \), \( \lambda_e \), and \( \lambda_{\alpha} \), respectively. Which of the following is correct?

A room heater is rated 750 W, 220 V. An electric bulb rated 200 W, 220 V is connected in series with this heater. What will be the power consumed by the bulb and the heater respectively, when the supply is at 220 V?

Choose the correct statement:
Three charges 2q, ^-q. ^-q are located at the vertices of an equilateral triangle. At the centroid:

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?

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 :

When a ray of light enters from denser medium to rarer medium, its velocity is doubled. The critical angle for total internal reflection will be:

The electric charges are distributed in a small volume. The flux of the electric field through a sphere of radius 10 cm surrounding the total charge is 20 Vm. The flux over a concentric sphere of radius 20 cm 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?

A parallel beam of light of wavelength 500 nm is incident normally on a slit of width d. If the distance between slit and screen is 0.6 m and distance of second order minimum from the centre of the screen is 6.0 mm, What is the width of the slit?

The change of gaseous state directly to solid state without going through liquid state is called_____

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:

1 atm (Atmospheric Pressure) is equal to :

\(p→ n+v+ A\)
In this nuclear reaction A is a/an:

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:

A series AC circuit has a resistance 8Ω and a reactance of 6Ω . The impedance of the circuit is:

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 (\(\vec{v}\)):

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:

The height of a TV tower is 180 m. To what distance the transmission can be made from this tower, if the radius of earth is \(6.4 \times 10^6\) m?

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.

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:

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

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