HSC Science (General) 12th Standard Board Exam - Maharashtra State Board Question Bank Solutions for Physics

An ideal transformer has 100 turns in the primary and 250 turns in the secondary. The peak value of the AC is 28 V. The rms secondary voltage is nearest to ______ 

State the mathematical relation between a number of turns in the primary coil to a secondary coil in the step-up transformer. 

Distinguish between Step up and Step Down Transformer.

What is Transformer?

Explain step up and step down transformer?

The primary of a transformer has 40 turns and works on 100 V and 100 W. Find a number of turns in the secondary to step up the voltage to 400 V. Also calculate the current in the secondary and primary.

Describe the construction and working of a transformer with a neat labelled diagram.

In Hydrogen, the electron jumps from the fourth orbit to the second orbit. The wavenumber of the radiations emitted by an electron is ______  

The decay constant λ of a certain radioactive material is 0.2166 per day. The average life τ of the radioactive material is ______ 

The half-life of a certain radioactive species is 6.93 × 10⁵ seconds. What is the decay constant?  

Show that half life period of radioactive material varies inversely to decay constant λ.

The half-life of a certain radioactive nucleus is 3.2 days. Calculate (i) decay constant (ii) average life of radioactive nucleus.

Show that for radioactive decay N(t) = `"N"_"O" "e"^{-λ"t"}`, where symbols have their usual meaning.

Obtain an expression for the half-lifetime of radioactive material. Hence state the relation between an average life and half life time of radioactive material.

A radioactive substance decays to (1/10)^th of its original value in 56 days. Calculate its decay constant. 

What is alpha decay?

What is beta decay?

A 0.1 H inductor a 25 × 10^-6 F capacitor and a 15 Ω resistor are connected in series to a 120 V, 50 Hz AC source. Calculate the resonant frequency.

If ‘θ’ represents the angle of contact made by a liquid which completely wets the surface of the container then ______.

The disintegration rate of a radio-active sample is 10¹⁰ per hour at 20 hours from the start. It reduces to 5 × 10⁹ per hour after 30 hours. Calculate the decay constant.