List of top Physics Questions

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:

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

What is the de Broglie wavelength associated with an elector accelerated through a potential difference of 144 V?

If x is inversely proportional to y and y is directly proportional to z, then xz is :

Which amongst the following is not a type of lense ?

Why do light emitting diodes are preferred over conventional incandescent low power lamps?

In Young's double slit experiment, yellow light of wavelength 640 nm produces fringes of width 0.8 mm. What will be the fringe width if the light source is replaced by another monochromatic source of wavelength 720 nm and the separation between the slits is made thrice?

The truth table for one of the following logic gates is given. Identify the logic gate

The correct mathematical expression for amplitude modulated wave is:

The correct curve between stopping potential \( V_0 \) and intensity of incident radiation \( I \) at constant frequency is:

Which of the following statements is NOT correct:

A bulb of 100 W glows for 6 hours a day. The units of energy consumed in 7 days would be :

Light from a point source in air falls on spherical glass surface (n = 1.4 and radius of curvature 20 cm). The distance of light source from the glass surface is 150 cm, At what position is the image formed?

For a glass prism (μ= √3), the angle of minimum deviation is equal to the angle of prism. What is the angle of prism?

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

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

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 :

1 atm (Atmospheric Pressure) is equal to :

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:

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

Select the correct statement for nuclear force:

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?

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

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:

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