Physics Test - ...

A police car horn emits sound at a frequency of $240Hz$ when the car is at rest. If the speed of sound is $330m/s$, the frequency heard by an observer who is approaching the car at a speed of $11m/s$is:

A long horizontal rod has a bead, which can slide along its length and is initially placed at a distance $L$ from one end $A$ of the rod. The rod is set in angular motion about $A$ with constant angular acceleration $\alpha$. If the coefficient of friction between the rod and the bead is and gravity is neglected, then the time after which the bead starts slipping is:

Directions: The following question contains 4 choices (A), (B), (C), and (D), out of which ONLY ONE is correct.

In the experiment to determine the speed of sound using a resonance column is:

What is the dimension of $\frac{L}{RCV}$, where $L,R,C$, and $V$ have their usual meanings?

A magnet of magnetic moment $M$ and length $2l$ is bent at its mid-point such that the angle of bending is $60°$. Now, the magnetic moment is:

An observer is moving towards a stationary source with $\frac{1}{10}$ the speed of sound. The ratio of apparent frequency to real frequency is:

Two SHMs are respectively represented by $y_1=a\sin (\omega t-kx)$, and $y_2=b\cos (\omega t-kx)$. The phase difference between the two is:

A coil takes a current of $2A$ and $200W$ power from an alternating current source of $220V,50Hz$. What is the inductance of the coil?

$Li$ nucleus has three protons and four neutrons. Mass of lithium nucleus is $7.016005amu$. The mass of proton is $1.007277amu$ and the mass of a neutron is $1.008665amu$. A mass defect for lithium nucleus in $amu$ is: