List of top Physics Questions

A particle is moving with a constant speed along a straight-line path. A force is not required to
A man can cover a distance in 1 hour 24 minutes by covering 2/3 of the distance at 4 km/h and the rest at 5 km/h. The total distance is
The total displacement of the object that exhibits the following motion is
A known positive charge is located at point P as shown above, between two unknown charges, Q1 and Q2. P is closer to Q2 than Q1. If the net electric force acting on the charge at P is zero, it may correctly be concluded that:
A square closed loop of area A, lying in the horizontal plane, is moving horizontally with velocity \( v \) in a uniform vertical magnetic field \( B \). Which one of the following statements is FALSE?
Helium is two times heavier than H2. The average kinetic energy per molecule for helium at 300K is
If the initial decay rate of a radioactive sample is \( R_0 \), then the decay rate after a half-life time \( T_{1/2} \) is
The densities of the nuclei: \(^{24}_{12}Mg\), \(^{40}_{20}Ca\) and \(^{88}_{38}Sr\),
In the following circuit, the charge stored in capacitors \( C_1 \), \( C_2 \), and \( C_3 \) are
Consider the following spring configurations:
If the first spring is stretched by an amount \( \Delta x \), the second system will be stretched by:
The magnetic properties of magnets are
Diffraction of light involves
Which of the following is not a representation of uniform motion?
A wire of length \( L \) meter carrying current \( i \) ampere is bent in the form of a circle. The magnitude of its magnetic moment in SI units is:
In the circuit below, A and B represent two inputs and C represents the output. The circuit represents:
The torque of a force \( \mathbf{F} = 4\hat{i} - 2\hat{j} + 3\hat{k} \) about the origin is \( \mathbf{r} \). The force acts on a particle having position vector \( \hat{i} + 2\hat{j} - \hat{k} \). Then the torque \( \mathbf{r} \) is:
The current I drawn from the 5 volt source will be:
A particle is moving in a uniform circular motion of radius \( R \) with angular velocity \( \omega \) in the anti-clockwise direction. Another particle is also moving along the same circular path but in the clockwise direction with the same angular velocity \( \omega \). Suppose, both the particles start at \( t = 0 \) from the same point (R, 0) in opposite directions. The minimum time \( t \) after which the velocities of the two particles become orthogonal to each other is:
A point object is placed at a distance of 25 cm from a thin plano-convex lens of focal length 20 cm. The plane surface of the lens is now silvered. The image created by the system is at:
A particle moves in a circle of radius \( R \). In half the period of revolution its displacement and distance covered respectively are:
The work function of a given metal is 4 eV. The longest wavelength of light that can cause photoelectron emission from this metal is:
The temperature of an ideal gas is increased from 75 K to 300 K. If at 75 K the r.m.s. velocity of the gas molecules is \(v\), at 300 K it becomes:
A ray of light passes through four transparent media with refractive index \(n_1, n_2, n_3, n_4\) as shown in the figure. The surfaces of all media are parallel. If the emergent ray ST is parallel to the incident ray PQ, we must have:
The efficiency of a Carnot engine operating between a reservoir and an sink is \( \eta \). If the temperature of the reservoir is increased by 50% and that of the sink is decreased by 50%, the new efficiency will be:
A system goes from state a to b along the path abc, when 20 kJ of heat flows into the system and the system does 7.6 kJ of work. If the system is returned back from b to a along the curved path bca due to a work of 5 kJ done on it, then