List of top Physics Questions

If the percentage increase in the pressure of a given mass of gas in a container at constant temperature is 100%, then its volume
Three charges \(+Q\), \(q\), \(+Q\) are placed respectively, at distances \(0\), \(\frac{d}{2}\), and \(d\) from the origin on the x-axis. If the net force experienced by \(+Q\) placed at \(x = 0\) is zero, then the value of \(q\) is
A conducting sphere of radius \(R\) carrying a charge \(Q\) lies concentrically inside an uncharged conducting shell of radius \(2R\). If they are joined by a metal wire, then the charge flowing to the shell and the amount of heat produced are respectively:
If \(n\), \(e\), \(\tau\), and \(m\) represent the concentration, the charge, the relaxation time, and the mass of an electron in a metal, then the resistance of a wire made of the metal of length \(l\) and cross-sectional area \(A\) is:
If the magnetic field is along the positive y-axis and the electron is moving along the positive x-axis, the direction of force on the electron is
Two photons each of energy \(2~\text{eV}\) incident simultaneously on a photosensitive material of work function \(3~\text{eV}\). The maximum kinetic energy of the emitted photoelectrons is
An electron in the ground state of hydrogen atom absorbs \(10.2~\text{eV}\) energy. The orbital angular momentum of the electron increases by
If the speed of light was half the present value, the energy released in a nuclear reaction decreases by
In the given logic circuit, if A and B are the inputs, then P and Q are respectively
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logic circuit, if A and B are the inputs, then P and Q are respectively
The P-V diagram of a Carnot's engine is shown in the graph below. The engine uses 1 mole of an ideal gas as working substance. From the graph, the area enclosed by the P-V diagram is
[ The heat supplied to the gas is 8000 J ]
P-V diagram of a Carnot's Engine
List-I shows different radioactive decay processes and List-II provides possible emitted particles. Match each entry in List-I with an appropriate entry from List-II, and choose the correct option.
 List-I List-II
(P)\(^{238}_{92}U → ^{234}_{91}Pa\)(1)one 𝛼 particle and one 𝛽+ particle
(Q)\(^{214}_{82}Pb → ^{210}_{82}Pb\)(2)three 𝛽− particles and one 𝛼 particle
(R)\(^{210}_{81}Tl → ^{206}_{82}Pb\)(3)two 𝛽− particles and one 𝛼 particle
(S)\(^{228}_{91}Pa → ^{224}_{88}Ra\)(4)one 𝛼 particle and one 𝛽− particle
  (5)one 𝛼 particle and two 𝛽+ particles
A slide with a frictionless curved surface, which becomes horizontal at its lower end, is fixed on the terrace of a building of height 3ℎ from the ground, as shown in the figure. A spherical ball of mass 𝑚 is released on the slide from rest at a height ℎ from the top of the terrace. The ball leaves the slide with a velocity \(\hat{u}_0=u_0\hat{x}\) and falls on the ground at a distance 𝑑 from the building making an angle θ with the horizontal. It bounces off with a velocity of v and reaches a maximum height of ℎ1. The acceleration due to gravity is 𝑔 and the coefficient of restitution of the ground is \(\frac{1}{\sqrt3}\). Which of the following statement(s) is(are) correct?
A slide with a frictionless curved surface
The electric field associated with an electromagnetic wave propagating in a dielectric medium is given by \(\vec{E}\)=30(2𝑥̂ + 𝑦̂)sin [2𝜋 (5×1014𝑡 −\(\frac{10^7}{3}z\))] Vm−1. Which of the following option(s) is(are) correct? [Given: The speed of light in vacuum, 𝑐 = 3 × 108 ms−1]
In a transistor amplifier, the voltage gain is
The total energy of an electron in an orbit of hydrogen atom is \( E \). The potential energy of the electron in the same orbit is
A resistor of 100 \( \Omega \), an inductor of \( \frac{25}{\pi} \) mH, and a capacitor of 0.1 \( \mu \)F are connected in series to an ac source. The impedance of the circuit is minimum for a frequency of:
Two metal wires of same length, same area of cross-section have conductivities of their material \( \sigma_1 \) and \( \sigma_2 \). If they are connected in series, the effective conductivity is:
In the circuit, the cells are having negligible resistances. If the galvanometer shows null deflection, then the value of \( V \) is:
galvanometer shows null deflection,
The Curie temperature \( T_c \) represents:
If the rms speeds of helium and oxygen are equal, then the ratio of the temperatures of helium and oxygen is:
The equivalent capacitance between A and B in the given figure is:
equivalent capacitance between A and B
Two charges \( Q \) and \( 4Q \) are separated by a distance of 6 cm. The distance of the point from \( 4Q \) at which the net electric field is zero is:
The frequency of a light ray is \( 6 \times 10^{14} \) Hz. Its frequency when it propagates in a medium of refractive index 1.5, will be:
A uniform solid sphere of mass \( M \) and radius \( a \) is surrounded by a concentric uniform thin spherical shell of mass 0.5M and radius 1.5a. The gravitational potential energy of a unit mass kept at a distance of 2.5a from the center is:
A steel ball of mass 200 g falls freely from a height of 20 m and bounces to a height of 10.8 m from the ground. If the energy lost in this process is absorbed by the ball, the rise in its temperature is: