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A circuit has a resistance of 12 ohm and an impendance of 15 ohm. The power factor of the circuit will be

(A) 0.4

(B) 0.8

(C) 0.125

(D) 1.25

(A) 0.4

(B) 0.8

(C) 0.125

(D) 1.25

Answer: B

(b)Power factor=\({\cos{\phi}}=\frac{{{R}}}{{{Z}}}=\frac{{12}}{{5}}=\frac{{4}}{{5}}={0.8}\).

(b)Power factor=\({\cos{\phi}}=\frac{{{R}}}{{{Z}}}=\frac{{12}}{{5}}=\frac{{4}}{{5}}={0.8}\).

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An a- particle and a proton are accelerated from rest by a potential difference of \({100}{V}\) After this their de Broglie

wavelength are \(\lambda_{{{a}}}{\quad\text{and}\quad}\lambda_{{{p}}}\) respectively The ratio \(\frac{{\lambda_{{{p}}}}}{\lambda_{{{p}}}}{)}\) , to the rearest integer is

wavelength are \(\lambda_{{{a}}}{\quad\text{and}\quad}\lambda_{{{p}}}\) respectively The ratio \(\frac{{\lambda_{{{p}}}}}{\lambda_{{{p}}}}{)}\) , to the rearest integer is

Can pressure (p) ,density (p) and velocity (v) be taken as fundunental quantities ?

A man of mass \({60}{k}{g}\) jumps from a trolley of mass \({20}{k}{g}\) standing on smooth surface with absolute velocity \({3}{m}/{s}\). Find velocity of trolley and total energy produced by man.

When interference is produced by two progressive waves of equal frequencies, then the maximum intensity of the resulting sound are \({N}\) times the intensity of each of the component waves. The value of \({N}\) is

(A) \({1}\)

(B) \({2}\)

(C) \({4}\)

(D) \({8}\)

(A) \({1}\)

(B) \({2}\)

(C) \({4}\)

(D) \({8}\)

Three liquids A, B and C of specific heats \({1}{c}{a}{l}/{g}-^{\circ}{C},{0.5}{c}{a}{l}/{g}-^{\circ}{C}{\quad\text{and}\quad}{0.25}{c}{a}{l}/{g}-^{\circ}{C}\) are at temperatures \({20}^{\circ}{C},{40}^{\circ}{C}{\quad\text{and}\quad}{60}^{\circ}{C}\) respectively. Find temperature in equilibrium if they are mixed together. Their masses are equal.

What is the smallest electric force between two charges placed at a distance of \({1.0}{m}\)?

Three capacitors having capacitances of \({8.4}\mu{F},{8.2}\mu{F}\) and \({4.21}\mu{F}\) are connected in series across a 36 potential difference.

(a) What is the charge on \({4.2}\mu{F}\) capacitor?

(b) What is the total energy stored in all three capacitors?

(c) The capacitors are disconnected from the potential difference without allowing them to discharge. They are then reconnected in parallel with each other, with the positively charged plates connected together. What is the voltage across each capacitor in the parallel combination?

(d) What is the total energy now stored in the capacitors?

(a) What is the charge on \({4.2}\mu{F}\) capacitor?

(b) What is the total energy stored in all three capacitors?

(c) The capacitors are disconnected from the potential difference without allowing them to discharge. They are then reconnected in parallel with each other, with the positively charged plates connected together. What is the voltage across each capacitor in the parallel combination?

(d) What is the total energy now stored in the capacitors?

For transistor action, which of the following statements are correct ?

(a) Base , emitter and collector regions should have similar size and doping concentrations

(b) The base region must be very thin and lightly doped

(C) ( c) The emitter junction is forward biased and collector junction is reverse biased

(d) Both the emitter junction as well as the collector junction are forward biased

(a) Base , emitter and collector regions should have similar size and doping concentrations

(b) The base region must be very thin and lightly doped

(C) ( c) The emitter junction is forward biased and collector junction is reverse biased

(d) Both the emitter junction as well as the collector junction are forward biased

Which waves constitude amplitude-modulated band?

The number of values of k for which the linear equations

\({4}{x}\text{}+\text{}{k}{y}\text{}+\text{}{2}{z}\text{}=\text{}{0}\)

\({k}{x}\text{}+\text{}{4}{y}\text{}+\text{}{z}\text{}=\text{}{0}\)

\({2}{x}\text{}+\text{}{2}{y}\text{}+\text{}{z}\text{}=\text{}{0}\)

posses a non-zero solution is :

(1) 3 (2) 2 (3) 1 (4) zero

\({4}{x}\text{}+\text{}{k}{y}\text{}+\text{}{2}{z}\text{}=\text{}{0}\)

\({k}{x}\text{}+\text{}{4}{y}\text{}+\text{}{z}\text{}=\text{}{0}\)

\({2}{x}\text{}+\text{}{2}{y}\text{}+\text{}{z}\text{}=\text{}{0}\)

posses a non-zero solution is :

(1) 3 (2) 2 (3) 1 (4) zero

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