Physics NCERT Exemplar Solutions Class 12th Chapter Fifteen

A wire having a linear mass density 9.0 * 10^-4 kg/m is stretched between two rigid supports with a tension of 900 N. The wire resonates at a frequency of 500 Hz. The next higher frequency at with the same wire resonates is 550 Hz. The length of the wire is______m.

A capacitor of 50   $\mu F$  is connected in a circuit as shown in figure. The charge on the upper plate of the capacitor is__________   $\mu C.$

A car is moving on a plane inclined at 30° to the horizontal with an acceleration of 10ms^-2 parallel to the upward. A bob is suspended by a string from the roof of the car. The angle in degree which the string makes with the vertical is______. (Take g = 10ms^-2)

A square shaped wire with resistance of each side   $3\Omega$  is bent to form a complete circle. The resistance between two diametrically opposite points of the circle in unit of   $\Omega$  will be________.

The voltage drop across $15\Omega$ resistance in the given figure will be_______V.

The voltage drop across   $15\Omega$  resistance in the given figure will be_______V.

 Choose the correct statement for amplitude modulation

Only 2% of the optical source frequency is the available channel bandwidth for an optical communicating system operating at 1000 nm. If an signal requires a bandwith of 8 kHz, how many channels can be accommodated for transmission:

A longitudinal wave is represented by x = 10 sin 2p $\left(nt-\frac{x}{\lambda }\right)cm.$  The maximum particle velocity will be four times the wave velocity if the determined value of wavelength is equal to:

A transverse wave s represented by y = $2sin\left(\omega t-kx\right)cm.$ The value of wavelength (in cm) for which the wave velocity becomes equal to the maximum particle velocity. Will be: