HSC Science (Computer Science) १२ वीं कक्षा - Maharashtra State Board Question Bank Solutions for Physics

What is the energy required to built up a current of lA in an inductor of 20 mH?

Explain the process of corona discharge.

Draw a neat labelled diagram of Radiant power of a blackbody per unit range of wavelength as a function of wavelength.

Assuming that the temperature at the surface of the sun is 6000 K, find out the size of a virtual star (in terms of the size of the sun) whose surface termperature is 3000 K and the power radiated by the virtual star is 25 times the power radiated by the sun. Treat both the sun and virtual star as a blackbody.

The velocity of bob of a second’s pendulum when it is 6 cm from its mean position and amplitude of 10 cm, is ______.

State Wein's displacement law

Obtain an expression for average power dissipated in a purely resistive A.C. circult. 

Find the ratio of the potential differences that must be applied across the parallel and series combination of two capacitors C₁ and C₂ with their capacitances in the ratio 1 : 2 so that the energy stored in the two cases becomes the same.

Choose the correct option:

A standing wave is produced on a string clamped at one end and free at the other. The length of the string ______.

A resistor of 500 Ω and an inductance of 0.5 H are in series with an AC source which is given by V = `100 sqrt2` sin (1000 t). The power factor of the combination is ______.

In a series LCR circuit, the phase difference between the voltage and the current is 45°. Then the power factor will be ______.

What is wattles current?

When an AC source is connected to an ideal inductor show that the average power supplied by the source over a complete cycle is zero.

Prove that an ideal capacitor in an AC circuit does not dissipate power

(a) An emf e = e₀ sin ωt applied to a series L - C - R circuit derives a current I = I₀sinωt in the circuit. Deduce the expression for the average power dissipated in the circuit.
(b) For circuits used for transporting electric power, a low power factor implies large power loss in transmission. Explain.

An AC source generating a voltage e = e₀sinωt is connected to a capacitor of capacitance C. Find the expression for the current i flowing through it. Plot a graph of e and i versus ωt.

A light bulb is rated 100W for 220 V AC supply of 50 Hz. Calculate

1. resistance of the bulb.
2. the rms current through the bulb

An AC circuit consists of only an inductor of inductance 2 H. If the current is represented by a sine wave of amplitude 0.25 A and frequency 60 Hz, calculate the effective potential difference across the inductor. (π = 3.142)

Alternating emf of e = 220 sin 100 πt is applied to a circuit containing an inductance of (1/π) henry. Write an equation for instantaneous current through the circuit. What will be the reading of the AC galvanometer connected in the circuit?

A 25 μF capacitor, a 0.10 H inductor, and a 25Ω resistor are connected in series with an AC source whose emf is given by e = 310 sin 314 t (volt). What is the frequency, reactance, impedance, current, and phase angle of the circuit?