List of top Physics Questions

The LC series resonant circuit produces a resonant frequency '\(f\)'. If L is tripled and 'C' is increased by 3C, the resonant frequency will be

In LCR series circuit at resonance

The resistor '\(R\)' inductance '\(L\)' and capacitance '\(C\)' are connected in series with an a.c. source. When 'L' is removed from the circuit, the phase difference between voltage and current in the circuit is \(\frac{π}{3}\). If instead, C is removed from the circuit, the phase difference is again \(\frac{π}{3}\). The power factor of the circuit is

The magnetic field at perpendicular distance '\(r\)' from a long wire carrying current '\(I\)' is '\(B\)'. The magnetic field at perpendicular distance '\(2r\)' from the same wire is

Two coils have self inductance \(L_1\) and \(L_2\). The current through them is increasing at constant rate. If the power dissipated in both the coils is same, then the ratio of energy stored in the coil having inductance \(L_1\) to that in \(L_2\) is

Three coils of inductance, \(L_1\) = 2 H, \(L_2\) = 3 H and \(L_3\) = 6 H are connected so that they are separated from each other. To obtain the effective inductance of \(\frac{18}{11}\) H between points A and B, out of the following figures, the correct one is

In the following figure, the current I is equal to

An electric dipole of length \(3\text{cm}\) is placed with its axis making an angle of \(60^{\circ}\) with a uniform electric field of \(5\times 10^4\) N/C. It experiences a torque of \(9\sqrt{3}\) Nm. The magnitude of charge on the dipole is \((sin60^{\circ} = \frac{\sqrt{3}}{2})\)

The magnetic field at the center of circular coil carrying current '\(I\)' for a single turn of a given length of wire is '\(B\)'. The same wire is bent in a circular coil having two turns. When the same current passes through it, the value of magnetic field becomes

With a resistance '\(X\)' connected in series with a galvanometer of resistance \(100 \Omega\), it acts as a voltmeter of range 0 - 15 V. To double the range, a resistance of \(1500 \Omega\) is to be connected in series with '\(X\)'. The value of '\(X\)' in \(\Omega\) is

Three capacitors \(C_1\), \(C_2\) and \(C_3\) are connected to voltage source V as shown in figure. The voltage across \(C_3\) will be

Two capacitors, \(C_1\) and \(C_2\) have their capacitances in the ratio 1:2. \(V_s\) and \(V_p\) are the potential differences applied across the series and parallel combination of \(C_1\) and \(C_2\) respectively, so that the energy stored in the two cases becomes same. The ratio \(V_s\) to \(V_p\) is

Select the WRONG statement about polar molecules.

In case of stationary wave pattern, which of the following statement is CORRECT ?

A and B are two wires whose fundamental frequencies are 256 Hz and 382 Hz respectively. When third harmonic of A and the second harmonic of B are sounded together, the number of beats heard in two second will be

A particle executing simple harmonic motion starts from mean position with amplitude '\(A\)' and periodic time '\(T\)'. At what displacement is its speed one-fourth of the maximum speed?

Out of the following musical instruments which is ' NOT ' a percussion instrument?

The enclosed air inside a closed box of rigid walls has pressure \(P_1\). The density of air inside this box is constant. On heating the gas, the pressure of the enclosed air is increased from \(P_1\) to \(P_2\). Now it is observed that the sound travels \(1.4\) times faster than at pressure \(P_1\). The ratio \(P_2\) by \(P_1\) is

The speeds of the seven molecules are 1, 3, 5, 7, 2, 4 and 6 km/s respectively. The ratio of their r.m.s. velocity and average velocity will be

For a particle executing S.H.M., its potential energy is 8 times its kinetic energy at a certain displacement '\(x\)' from the mean position. If '\(A\)' is the amplitude of S.H.M., the value of '\(x\)' is

A Carnot engine, whose efficiency is 40% takes heat from a source maintained at temperature 600K. To have an efficiency 60%, the intake temperature for the same exhaust temperature should be

The heat energy that must be supplied to 14 g of nitrogen at room temperature to raise its temperature by \(48 ^{\circ}\text{C}\) at constant pressure is (\(R\) = gas constant, Molecular weight of nitrogen \((\text{N}_2)\) = 28)

Two simple pendulums of lengths \(L_1\) and \(L_2\) have periodic time \(T_1\) and \(T_2\) respectively \((T_1 > T_2)\). The time period of the pendulum of length \((L_1-L_2)\) is
\([(L_1-L_2) > 60\text{ cm}]\)

The excess pressure inside a spherical water drop A is four times that of another water drop B. Then, the ratio of the mass of water drop A to that of drop B is

In a capillary tube of area of cross-section '\(a\)' water rises to height '\(h\)'. To what height will water rise in a capillary tube of area of cross-section \(4a\)?