List of top Physics Questions

In the circuit shown, assuming the threshold voltage of the diode is negligibly small, then the voltage $ V_{AB} $ is correctly represented by:

Assertion : In an ideal step-down transformer, the electrical energy is not lost.

Reason (R): In a step-down transformer, voltage decreases but the current increases.

A car accelerates uniformly from rest to a velocity of $ 25 \, \text{m/s} $ in $ 10 \, \text{seconds} $. What is the acceleration of the car?

Consider the arrangement shown in the figure. A black vertical arrow and a horizontal thick line with a ball are painted on a glass plate. It serves as the object. When the plate is illuminated, its real image is formed on the screen.
Which of the following correctly represents the image formed on the screen?

Which logic gate is represented by the following combination of logic gates?

In Bohr’s model of hydrogen atom, find the percentage change in the radius of its orbit when an electron makes a transition from $ n = 3 $ state to $ n = 2 $ state.

A 1 cm segment of a wire lying along the x-axis carries a current of 0.5 A along the $ +x $-direction. A magnetic field $ \vec{B} = (0.4 \, \text{mT} \hat{j}) + (0.6 \, \text{mT} \hat{k}) $ is switched on. The force acting on the segment is:

Ruma reached the metro station and found that the escalator was not working. She walked up the stationary escalator with velocity $ v_1 $ in time $ t_1 $. On another day, if she remains stationary on the escalator moving with velocity $ v_2 $, the escalator takes her up in time $ t_2 $. The time taken by her to walk up with velocity $ v_1 $ on the moving escalator will be:

A convex lens forms an image at twice the distance of the object from the lens. What is the magnification?

Three thin uniform rods each of mass $ M $ and length $ L $ are placed along the three axes of a Cartesian coordinate system with one end of all the rods at origin. The moment of inertia of the system of the rods about z-axis is

Two infinitely long conductors kept along XX' and YY' axes are carrying current $ I_1 $ and $ I_2 $ along -X axis and -Y axis respectively. Find the magnitude and direction of the net magnetic field produced at point P(X, Y).

A bar magnet is initially at right angles to a uniform magnetic field. The magnet is rotated till the torque acting on it becomes one-half of its initial value. The angle through which the bar magnet is rotated is:

A conductor of length $ l $ is connected across an ideal cell of emf E. Keeping the cell connected, the length of the conductor is increased to $ 2l $ by gradually stretching it. If R and $ R' $ are initial and final values of resistance and $ v_d $ and $ v_d' $ are initial and final values of drift velocity, find the relation between:
$ R' $ and $ R $
$ R' = 4R $

In a diffraction experiment, the slit is illuminated by light of wavelength 600 nm. The first minimum of the pattern falls at $ \theta = 30^\circ $. Calculate the width of the slit.

Evaluate the integral: ∫ log((2 + x)^{2 + x}) dx

An electric field $ \vec{E} $ is given by:
\[ \vec{E} = \begin{cases} +100\, \hat{i} \dfrac{\text{N}}{\text{C}} & \text{for } x>0 \\ -100\, \hat{i} \dfrac{\text{N}}{\text{C}} & \text{for } x<0 \end{cases} \] A right circular cylinder of length $ 10\, \text{cm} $ and radius $ 2\, \text{cm} $, is placed such that its axis coincides with the x-axis and its two faces are at $ x = -5\, \text{cm} $ and $ x = 5\, \text{cm} $. Calculate: (a) the net outward flux through the cylinder, and (b) the net charge inside the cylinder.

The figure shows an opamp circuit with a 5.1 V Zener diode in the feedback loop. The opamp runs from $ \pm 15 \, {V} $ supplies. If a $ +1 \, {V} $ signal is applied at the input, the output voltage (rounded off to one decimal place) is:

If the silver coating around the centre of a concave mirror is removed, will the mirror still form the image of an object? Justify your answer.

A double convex lens of glass has both faces of the same radius of curvature 17 cm. Find its focal length if it is immersed in water. The refractive indices of glass and water are 1.5 and 1.33 respectively.

A charge of 2 $\mu C$ is placed in an electric field of intensity $ 4 \times 10^3 \, \text{N/C} $. What is the force experienced by the charge?

If the volume of the tetrahedron, whose vertices are $ A(1, 2, 3), B(-3, -1, 1), C(2, 1, 3) $ and $ D(-1, 2, x) $, is $ \frac{11}{6} $ cubic units, then the value of $ x $ is:

A particle moves along the x-axis under a force $ F(x) = 6x^2 $ N. The work done by this force in moving the particle from $ x = 1 \, \text{m} $ to $ x = 2 \, \text{m} $ is:

If the protons and electrons are the only basic charges in the universe, all the observable charges have to be integral multiples of e. Thus, if an object contains x electrons and y protons, the net charge on the object will be

An oxygen cylinder of volume 30 litre has 18.20 moles of oxygen. After some oxygen is withdrawn from the cylinder, its gauge pressure drops to 11 atmospheric pressure at temperature $27^\circ$C. The mass of the oxygen withdrawn from the cylinder is nearly equal to: [Given, $R = \frac{100}{12} \text{ J mol}^{-1} \text{K}^{-1}$, and molecular mass of $O_2 = 32 \text{ g/mol}$, 1 atm pressure = $1.01 \times 10^5 \text{ N/m}^2$]

In Young's double slit experiment, the screen is moved 30 cm towards the slits. As a consequence, the fringe width of the pattern changes by 0.09 mm. If the slits separation used is 2 mm, calculate the wavelength of light used in the experiment.