HSC Science (Electronics) १२ वीं कक्षा - Maharashtra State Board Question Bank Solutions

What is the peak wavelength of the radiation emitted by a blackbody at 35° C?

Calculate (i) the pressure due to the weight of the water at a depth of 2.5 m and (ii) the depth below the surface of water at which the pressure due to the weight of the water equals 1.0 atm.

A clock regulated by a second pendulum keeps the correct time. During winter the length of the pendulum decreases by 1 %. How much will the clock gain or lose in one day?

The surface tension of boiling water is ______.

A drop of water of radius 8 mm breaks into number of droplets each of radius 1 mm. How many droplets will be formed?

Define angle of contact.

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