Science (English Medium) कक्षा १२ - CBSE Question Bank Solutions for Physics

To produce an emission spectrum of hydrogen it needs to be ______.

Relation between atomic number (Z), neutron number (N) and mass number (A) is ______.

The nuclei of isotopes of a given element differ from each other in their number of ______.

Lenz’s law is a consequence of the law of conservation of ______.

In an L.C.R. series a.c. circuit, the current ______.

If an LCR series circuit is connected to an ac source, then at resonance the voltage across ______.

In series combination of R, L and C with an A.C. source at resonance, if R = 20 ohm, then impedence Z of the combination is ______.

In an LCR series a.c. circuit, the voltage across each of the components, L, C and R is 50V. The voltage across the LC combination will be ______.

Assertion: When the frequency of the AC source in an LCR circuit equals the resonant frequency, the reactance of the circuit is zero, and so there is no current through the inductor or the capacitor.
Reason: The net current in the inductor and capacitor is zero.

A coil of 40 henry inductance is connected in series with a resistance of 8 ohm and the combination is joined to the terminals of a 2 volt battery. The time constant of the circuit is ______.

Which of the following statements is not correct?

In series LCR circuit, the phase angle between supply voltage and current is ______.

In a series LCR circuit the voltage across an inductor, capacitor and resistor are 20 V, 20 V and 40 V respectively. The phase difference between the applied voltage and the current in the circuit is ______.

At resonance frequency the impedance in series LCR circuit is ______.

At resonant frequency the current amplitude in series LCR circuit is ______.

A 20 volt AC is applied to a circuit consisting of a resistance and a coil with negligible resistance. If the voltage across the resistance is 12 volt, the voltage across the coil is ______.