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

Define binding energy and obtain an expression for binding energy of a satellite revolving in a circular orbit round the earth.

State Hooke’s law. Define the elastic limit and modulus of elasticity.

When a resistor of 5Ω is connected across the cell, its terminal potential difference is balanced by 150 cm of potentiometer wire and when a resistance of 10 Ω is connected across the cell, the terminal potential difference is balanced by 175 cm same potentiometer wire. Find the balancing length when the cell is in open circuit and the internal resistance of the cell.

Assuming expression for impedance in a parallel resonant circuit, state the conditions for parallel resonance. Define resonant frequency and obtain an expression for it.

Explain refraction of light on the basis of wave theory. Hence prove the laws of refraction

When the balance point is obtained in the potentiometer, a current is drawn from ______.

Why is it useful to define the radius of gyration?

Define a Potentiometer.

Define potential gradient of the potentiometer wire.

Why should not the jockey be slided along the potentiometer wire?

Discuss the necessity of radius of gyration. 

Answer in brief:

State the conditions under which the theorems of parallel axes and perpendicular axes are applicable. State the respective mathematical expressions.

How is potential gradient measured? Explain.

State the uses of a potentiometer.

What are the disadvantages of a potentiometer?

Distinguish between a potentiometer and a voltmeter.

What will be the effect on the position of zero deflection if only the current flowing through the potentiometer wire is increased?

Describe how a potentiometer is used to compare the EMFs of two cells by connecting the cells individually.

Describe with the help of a neat circuit diagram how you will determine the internal resistance of a cell by using a potentiometer. Derive the necessary formula.

A battery of emf 4 volt and internal resistance 1 Ω is connected in parallel with another battery of emf 1 V and internal resistance 1 Ω (with their like poles connected together). The combination is used to send current through an external resistance of 2 Ω. Calculate the current through the external resistance.