List of top Physics Questions

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?

A radioactive isotope phosphorous-32 has an initial activity 10μCi and has half life of 14 days. What is the activity of the source after 42 days?

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?

Select the correct statement for nuclear force:

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

1 atm (Atmospheric Pressure) is equal to :

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?

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:

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

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

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

Match List I with List II

Choose the correct answer from the options given below:

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

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:

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

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.

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

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?

An electric bulb has a filament made of _______

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

The forbidden energy gaps in conductors, semiconductors and insulators are (E_g)_c, (E_g)_s and (E_g)₁ respectively. What is the relation among them ?

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