English Medium कक्षा १० - CBSE Question Bank Solutions

Draw circuit symbols for  

 a cell 

Draw circuit symbols for  

 a battery of three cells 

Draw circuit symbols for  

an open switch

Draw circuit symbols for 

A closed switch

What is a circuit diagram

Draw the labelled diagram of an electric circuit comprising of a cell, a resistance, an ammeter, a voltmeter and a closed switch (or closed plug key). Which of the two has a large resistance : an ammeter or a voltmeter?

Draw a circuit diagram to show how 3 bulbs can be lit from a battery so that 2 bulbs are controlled by the same switch the third bulb has its own switch. 

Write the balanced equation for the following chemical reaction.

\[\ce{Sodium + Water -> Sodium hydroxide + Hydrogen}\]

Write a balanced chemical equation with state symbols for the following reaction.

Sodium hydroxide solution (in water) reacts with hydrochloric acid solution (in water) to produce sodium chloride solution and water.

Explain with the help of a labelled circuit diagram how you will find the resistance of a combination of three resistors, or resistance R₁, R₂ and R₃, joined in parallel. Also mention how you will connect the ammeter and the voltmeter in the circuit when measuring the current in the circuit and the potential difference across one of the three resistors of the combination.

Answer the following question.
With the help of a suitable circuit diagram prove that the reciprocal of the equivalent resistance of a group of resistances joined in parallel is equal to the sum of the reciprocals of the individual resistances. 

A teacher gave two test tubes to the students, one containing water and the other containing sodium hydroxide. She asked them to identify the test tube containing sodium hydroxide solution. Which one of the following can be used for identification?

Which of the following is true for an unbalanced chemical equation?

Which of the following is Not True with respect to the neutralisation reaction?

Before burning in air, the magnesium ribbon is cleaned by rubbing with sand paper to:

In a chemical reaction between sulphuric acid and barium chloride solution the white precipitates formed are of:

A chemical reaction does not involve:

It is necessary to balance a chemical equation in order to satisfy the law of:

When ferrous sulphate is heated strongly it undergoes decomposition to form ferric oxide as a main product accompanied by a change in colour from:

Magnesium ribbon is rubbed before burning because it has a coating of ____________.