HSC Science Class 12 - Tamil Nadu Board of Secondary Education Question Bank Solutions

Give the physical meaning of binding energy per nucleon.

Explain the variation of average binding energy with the mass number using a graph and discuss about its features.

Calculate the mass defect and the binding energy per nucleon of the \[\ce{^108_47Ag}\] nucleus. [atomic mass of Ag = 107.905949].

Show that the mass of radium \[\ce{^226_88Ra}\] with an activity of 1 curie is almost a gram. Given T1/2 = 1600 years.

The principle based on which a solar cell operates is ____________.

The light emitted in an LED is due to

The output of the following circuit is 1 when the input ABC is

Give the Barkhausen conditions for sustained oscillations.

Explain the current flow in an NPN transistor.

Explain the need for a feedback circuit in a transistor oscillator.

What is rectification?

Sketch the static characteristics of a common emitter transistor and bring out the essential features of input and output characteristics.

Transistor functions as a switch. Explain.

Describe the function of a transistor as an amplifier with the neat circuit diagram. Sketch the input and output wave forms.

Assuming V_CEsat = 0.2 V and β = 50, find the minimum base current (I_B) required to drive the transistor given in the figure to saturation.

A transistor of α = 0.99 and V_BE = 0.7 V is connected in the common-emitter configuration as shown in the figure. If the transistor is in the saturation region, find the value of collector current.

In the circuit shown in the figure, the BJT has a current gain (β) of 50. For an emitter-base voltage V_EB = 600 mV, calculate the emitter-collector voltage V_EC (in volts).

The technology used for stopping the brain from processing pain is ____________.

The gravitational waves were theoretically proposed by ____________.

Comment on the recent advancement in medical diagnosis and therapy.