List of top Physics Questions

A block of mass $M$ is attached to the lower end of a vertical spring. The spring is hung from a ceiling and has force constant value $k$. The mass is released from rest with the spring initially unstretched. The maximum extension produced in the length of the spring will be
For the circuit shown in the figure
A charged particle (charge $q$ ) is moving in a circle of radius $R$ with uniform speed $v$. The associated magnetic moment $\mu$ is given by
A radioactive nucleus is being produced at a constant rate $\alpha$ per second. Its decay constant is $\lambda$. If $N_0$ are the number of nuclei at time t = 0, then the maximum number of nuclei possible are
A ray of light is incident on a plane mirror at an angle of $60^\circ$. The angle of deviation produced by the mirror is
An LCR series circuit, connected to a source $E$, is at resonance. Then
A galvanometer having a coil resistance of $ 60O $ shows full scale deflection when a current of 1.0 A passes through it. It can be converted unto an ammeter to read currents upto 5.0 A by
A steady current of $1.5\, A$ flows through a copper voltameter for 10 min. If the electrochemical equivalent of copper is $30 \times 10^{-5}\, g\, C ^{-1}$, the mass of copper deposited on the electrode will be
A galvanometer coil has a resistance of $10 \, \Omega $ and the ammeter shows full scale deflection for a current of $1\,mA$. The shunt resistance required to convert the galvanometer into an ammeter of range $0-100\,mA$ is about
Three electric bulbs of $200\, W, 200 \,W$ and $400\, W$ are shown in figure. The resultant power of the combination is
A long straight wire of a circular cross-section (radius $ a $ ) carries a steady current $ I $ and the current $ I $ is uniformly distributed across this cross-section. Which of the following plots represents the variation of magnitude of magnetic field $B$ with distance $r$ from the centre of the wire?
In a potentiometer of one- metre length, an unknown emf voltage source is balanced at $60 \,cm$ length of potentiometer wire, while a $3 \,V$ battery is balanced at $45 \,cm$ length. Then the emf of the unknown voltage source is
A galvanometer of resistance $10\, \Omega$ gives full-scale deflection when $1\, mA$ current passes through it. The resistance required to convert it into a voltmeter reading upto $2.5\, V$ is
Ideal voltmeter connected as shown reads
If on applying the potential of 20 V on a conductor its conductance becomes $ 8\,{{(\Omega )}^{-1}}, $ then the current flowing through it will be
A conducting rod of length $l$ and mass $m$ is moving down a smooth inclined plane of inclination $\theta$ with constant velocity $v$. A current $i$ is flowing in the conductor in a direction perpendicular to paper inwards. A vertically upwards magnetic field $\vec{ B }$ exists in space. Then magnitude of magnetic field $\vec{ B }$ is
The value of current J in the circuit will be
The resistance of mercury at $4.2 \, K$ is
A particle executes simple harmonic oscillation with an amplitude $a$. The period of oscillation is $T$ . The minimum time taken by the particle to travel half of the amplitude from the equilibrium position is
The mass $M$ shown in the figure oscillates in simple harmonic motion with amplitude $A$. The amplitude of the point $P$ is
A uniform rod of length $L$ and mass $M$ is pivoted at the centre. Its two ends are attached to two springs of equal spring constants $k$. The springs are fixed to rigid supports as shown in the figure, and rod is free to oscillate in the horizontal plane. The rod is gently pushed through a small angle $\theta$ in one direction and released. The frequency of oscillation is
A body executing linear simple harmonic motion has a velocity of $3\, ms ^{-1}$ when its displacement is $4\, cm$ and a velocity of $4\, ms ^{-1}$ when its displacement is $3 cm$. What is the amplitude of oscillation ?
A body executes simple harmonic motion under the action of force $F_{1}$ with a time period $\frac{4}{5} s$. If the force is changed to $F_{2}$ it executes simple harmonic motion with time period $\frac{3}{5} s$. If both forces $F_{1}$ and $F_{2}$ act simultaneously in the same direction on the body, its time period will be
A block is resting on a piston which is moving vertically with SHM of period $1\, s$ . At what amplitude of motion will the block and piston separate?
Two simple harmonic motions are given by $ x=A\sin (\omega t+\delta ) $ and $ y=A\sin \left( \omega t+\delta +\frac{\pi }{2} \right) $ act on a particle simultaneously, then the motion of particle will be