List of top Physics Questions

One light year is equals to______.

What is the self inductance of a solenoid of length 50 cm, if area of cross section is 10 cm² and total number of turns is 600?

Consider two different hydrogen atoms. The electron in each atom is in first excited state. According to Bohr's model, electrons will have:

The boiling point of water _______

Two protons P and Q are placed between two charged plates A and B as shown, then

Energy band gap is maximum in:

After 4 hours,\(\frac{1}{16}\) of the initial amount of a certain radioactive isotype remains undecayed. What is the half life of the isotope?

What is the wavelength of light for the least energetic photon emitted in the Lyman series of the hydrogen atom spectrum lines?
(Take h=6.63×10^-34Js; c=3×10⁸ ms^-1; e=1.6×10^-19C)

The type of wavefront that emerges from a distant light source is:

A spherical conducting shell of inner radius r₁ and outer radius r₂ has a charge Q. A charge q is placed at the centre of the shell. The surface charge density on outer surface of the shell is:

A \(ẞ\)-particle is moving perpendicular to the uniform electric field created by a potential difference of \(6 × 10^3\) V across parallel metal plates separated by a vertical distance of 6 cm. What is the acceleration of the beta particle between the plates? (Mass of electron = \(9.1 × 10^{-31}\)kg) 

Which of the following is a transducer ?
(A) Loudspeaker
(B) Amplifier
(C) Rectifier
(D) Microphone
Choose the correct answer from the options given below :

A semiconductor has an electron concentration of 8 x 10¹³ m^-3 and hole concentration of 2 × 10³ m^-3. The semiconductor behaves as:

When 100 V dc is applied across a solenoid, a current of 1 A flows in it. When 100 V ac is applied across the same solenoid the current drops to 0.5 A. If the frequency of the ac source is 50 Hz, the impedance and inductance of the solenoid are:

C.V. Raman got Nobel Prize in 1930 for his discovery of:

Match List I with List II

Choose the correct answer from the options given below:

Four identical capacitors each of capacitance C are arranged as shown in the figure. What is the effective capacitance between P and Q?

Kirchhoff's Second Law is based on law of conservation of:

SI unit of temperature is ________.

A vertical electric field of magnitude 4.9×10⁵ NC^-1 just prevents a water droplet of mass 0.1 g from falling. What is the charge on the droplet? Take acceleration due to gravity 9.8 ms^-2.

An alternating voltage V = 140 sin 100 πt is connected across a pure resistor of resistance 40 Ω. What is the rms current through the resistor? (Take √2 = 1.4)

A conducting sphere of radius R is given a charge Q. What is the electric field and the electric potential at the centre of the sphere?

Six equal resistances are connected between points P, Q and R as shown in the figure. The net resistance will be maximum between:

Choose the correct answer from the following:
If three charged particles are collinear and are in equilibrium, then:

Which of the following statements are correct?
(A) The resistivity of a semiconductor decreases with increasing temperature.
(B) The potentiometer is unaffected by the internal resistance of the source.
(C) In ionic crystals and electrolytic liquids electrons carry the electric current.
(D) Ohm's law fails if V depends on I non-linearly.
(E) Kirchhoff's rules are used for analysis of electric circuits.
Choose the correct answer from the options given below: