List of top Physics Questions

In LCR circuit total potential is 10V and L-C-R connected in series the potential on L and C are 5v and 11 v respectively find the potential drop on R.

In the following circuit, the battery has an emf of $2 \, \text{V}$ and an internal resistance of $\frac{2}{3} \, \Omega$. The power consumption in the entire circuit is ______ W.

A dust particle of mass $4 \times 10^{-12} \, {mg}$ is suspended in air under the influence of an electric field of 50 N/C directed vertically upwards. How many electrons were removed from the neutral dust particle? [Take, $g = 10 \, {m/s}^2$]

The relation between the current $ i $ (in ampere) in a conductor and the time $ t $ (in second) is given by $ i = 12t + 9t^2 $. The charge passing through the conductor between the times $ t = 2 \, \text{s} $ and $ t = 10 \, \text{s} $ is.

The charge $ q $ (in coulombs) passing through a $ 10 \Omega $ resistor as a function of time $ t $ (in seconds) is given by: \[ q = 3t^2 - 2t + 6 \] The potential difference across the ends of the resistor at time $ t = 5 $ s is:

A uniform rod AB of length 1 m and mass 4 kg is sliding along two mutually perpendicular frictionless walls OX and OY. The velocity of the two ends of the rod A and Bare 3 m/s and 4 m/s respectively, as shown in the figure. Then which of the following statement(s) is/are correct?

The graph which shows the variation of $\big(\frac{1}{\lambda^2} \big)$and its kinetic energy, is $E$ (where $λ$ is de Broglie wavelength of a free particle):

A logic circuit provides the output y as per the following truth table:

A	B	Y
0	0	1
0	1	0
1	0	1
1	1	0

The expression for the output Y is:

In an ideal transformer, the turns ratio is $N_p/N_s$ =1/2 .The ratio $V_S:V_P$ is equal to (the symbols carry their usual meaning):

A bob is whirled in a horizontal plane by means of a string with an initial speed of ω rpm. The tension in the string is T. If speed becomes 2ω while keeping the same radius, the tension in the string becomes:

The maximum height reached by a projectile is 64 m. If the initial velocity is halved, the new maximum height of the projectile is ______ m.

Inside a solenoid of radius $ 0.5 $ m, the magnetic field is changing at a rate of $ 50 \times 10^{-6} $ T/s. The acceleration of an electron placed at a distance of $ 0.3 $ m from the axis of the solenoid will be:

The displacement equations of sound waves produced by two sources are given by: $ y_1 = 5 \sin(400t) $ and $ y_2 = 8 \sin(408t) $, where $ t $ is time in seconds. If the waves are produced simultaneously, the number of beats produced per minute is:

The magnetic field at the centre of a wire loop formed by two semicircular wires of radii $ R_1 = 2\pi \, m $ and $ R_2 = 4\pi \, m $ carrying current $ I = 4A $ as per figure given below is $ \alpha \times 10^{-7} \, T $. The value of $ \alpha $ is ______. (Centre O is common for all segments)

If $ L = 40\,\text{mH} $, $ C = 100\,\mu\text{F} $, what is the angular frequency $ \omega $ at resonance?

Match List I with List II.

List I (Material)		List II (Subsceptibility(χ))
A.	Diamagnetic	I.	χ = 0
B.	Ferromagnetic	II.	0 > χ ≥ –1
C.	Paramagnetic	III.	χ >> 1
D.	Non-magnetic	IV.	0 < χ < ε (a small positive number)

Choose the correct answer from the options given below:

Position of an ant $ S $ (in meters) moving in the Y-Z plane is given by $ S = 2t \hat{j} + 5t \hat{k} $ (where $ t $ is in seconds). The magnitude and direction of velocity of the ant at $ t = 1 \, s $ will be:

The mass of a planet is $\frac{1}{10}$th that of the earth and its diameter is half that of the earth. The acceleration due to gravity on that planet is :

Let $ \theta $ be the angle between two vectors $ \vec{A} $ and $ \vec{B} $. If $ \hat{a}_\perp $ is the unit vector perpendicular to $ \vec{A} $, then the direction of $ \vec{B} - \vec{B} \sin \theta \hat{a}_\perp $ is:

Given two force vectors:
\[ \vec{F}_1 = 2\hat{i} + 3\hat{j} - \hat{k}, \quad \vec{F}_2 = \hat{i} + \hat{j} + \hat{k} \] What is the magnitude of the resultant force?

The percentage error in the measurement of mass and velocity are 3% and 4% respectively. The percentage error in the measurement of kinetic energy is:

Two isolated metallic spheres $S_1$ and $S_2$ of radii $1 \, \mathrm{cm}$ and $3 \, \mathrm{cm}$ respectively are charged such that both have the same charge density \[ \sigma = \frac{2}{\pi} \times 10^{-9} \, \mathrm{C/m^2}. \] They are placed far away from each other and connected by a thin wire. Calculate the new charge on sphere $S_1$.

An electron is projected from the right plate of set I directly towards its left plate. It just comes to rest at the plate. The speed with which it was projected is about:
(Take $ \frac{e}{m} = 1.76 \times 10^{11} \, C/kg} $)

A conducting wire is stretched by applying a deforming force, so that its diameter decreases to 40% of the original value. The percentage change in its resistance will be:

An object is placed at a distance of 10 cm from a lens with a focal length of 30 cm. What is the magnification of the image?