List of top Physics Questions

The magnitude of electric field intensity $ E $ is such that, an electron placed in it would experience an electrical force equal to its weight. Then the value of $ E $ is:

The electric field $ \mathbf{E} $ in a region is given by $ \mathbf{E} = 3\hat{i} + 5\hat{j} $. The net electric flux through a square area of side 2 m parallel to y - z plane is

A block of mass $ m $ and charge $ q $ is connected to a point 'O' with an inextensible string. This system is on a horizontal table. An electric field $ E $ is applied perpendicular to the string and in the plane of the horizontal table. The tension in the string when it becomes parallel to the electric field is:

Two capacitors of capacity 4 μF and 6 μF are connected in series to a 500 V battery. The potential difference across the 4 μF capacitor is:

In the given circuit, if the current flowing through 5 $ \Omega $ resistor is 0.5 A, then the value of $ E $ is:

current flowing through 5 Ω resistor is 0.5 A

A disc is rolling without slipping on a surface. The radius of the disc is R. At t = 0, the top most point on the disc is A as shown in figure. When the disc completes half of its rotation, the displacement of point A from its initial position is

As shown above, a hollow cylinder has a charge q within it. If Φ is the electric flux through the curved surface ‘B’, then the flux linked with the plane surface ‘A’ is,

For a nucleus AAX having mass number A and atomic number Z
A. The surface energy per nucleon $(b_s)=−a_1A^{\frac{2}{3}} $
B. The Coulomb contribution to the binding energy $b_c=−a_2\frac{Z(Z−1)}{A^{\frac{4}{3}}} $
C. The volume energy b_v=a₃A
D. Decrease in the binding energy is proportional to surface area.
E. While estimating the surface energy, it is assumed that each nucleon interacts with 12 nucleons. ( a₁,a₂ and a₃ are constants)
Choose the most appropriate answer from the options given below:

A string of length $ L $ is stretched by $ \frac{L}{20} $ and the speed of transverse waves along it is $ v $. The speed of the wave when it is stretched by $ \frac{L}{10} $ will be:

A capillary tube of radius 0.1 mm is dipped in water. The water rises to a height of 2 cm in the tube. If the surface tension of water is 0.072 Nm$^{-1}$, the contact angle between water and wall of the tube is

What is the value of force on a closed circuit in a magnetic field?

Assuming the earth to be a sphere of uniform mass density, the weight of a body at a depth $d=\frac{R}{2}$ from the surface of earth, if its weight on the surface of earth is 200 N, will be

Two satellites P and Q are moving in different circular orbits around the Earth (radius 𝑅). The heights of P and Q from the Earth surface are $ℎ_P$ and $ℎ_Q$, respectively, where $ℎ_P = \frac{𝑅}{3}$. The accelerations of P and Q due to Earth’s gravity are $𝑔_P$ and $𝑔_Q$, respectively. If $\frac{𝑔_P}{𝑔_Q} = \frac{36}{25}$, what is the value of $ℎ_Q?$

Two satellites of masses m and 3m revolve around the earth in circular orbits of radii r & 3r respectively. The ratio of orbital speeds of the satellites respectively is

The time period of a satellite revolving above earth's surface at a height equal to R will be
(given: $g= \pi^2 \ m/s^2$, R= radius of earth)

A space ship of mass 2 × 10⁴ kg is launched into a circular orbit close to the earth surface. The additional velocity to be imparted to the spaceship in the orbit to overcome the gravitational pull will be (if g = 10 m/s² and radius of earth = 6400 km)

The radii of two planets 'A' and 'B' are 'R' and '4R' and their densities are $ \rho $ and $ \frac{\rho}{3} $ respectively. The ratio of acceleration due to gravity at their surfaces (i.e. $ g_A : g_B $) will be:

The work done in a gravitational field between two points does not depend upon the path between these points. The field

The time period of a simple pendulum on the surface of the Earth is $ T $. At what height above the surface will the time period become $ 2T $?
(Radius of Earth = $ 6400 \, \text{km} $)

Which of the following statements are true about acceleration due to gravity $ g $?
A. $ g $ is greater at poles.
B. $ g $ decreases with height.
C. $ g $ is same all over Earth.
D. $ g $ is maximum at centre of Earth.

A satellite is plad in a circular orbit around the earth at an altitude of 1000 km. The time period of the satellite in minutes is approximately (mass of the earth $= 6 \times 10^{24}$ kg, radius of the earth $= 6.4 \times 10^6$ m, $G = 6.67 \times 10^{-11}$ Nm$^2$kg$^{-2}$)

A car is moving towards a high cliff. The car driver sounds a horn of frequency $ f $. The reflected sound heard by the driver has a frequency $ 2f $. If $ v $ be the velocity of sound, then the velocity of the car in the same velocity units will be

With what velocity should an observer approach a stationary sound source, so that the apparent frequency of sound should appear double the actual frequency?

In Young's double slit interference experiment, using two coherent waves of different amplitudes, the intensity ratio between bright and dark fringes is 3. Then, the value of the ratio of the amplitudes of the waves that arrive there is

In Young's double slit experiment, the ratio of maximum and minimum intensities in the fringe system is 9:1. The ratio of amplitudes of coherent sources is