English Medium कक्षा १० - CBSE Question Bank Solutions

When does a solenoid behave as a magnet? Draw the pattern of the magnetic field produced inside it showing the directions of the magnetic field lines.

For the current carrying solenoid as shown, draw magnetic field lines and give reason to explain that out of the three points A, B and C, at which point the field strength is maximum and at which point it is minimum? 

State the colour which bends:

1. The most.
2. The least while passing through a glass prism.

Identify the product which represents the solid state in the above reaction.

Refer to the image below and state how the magnetic field pattern indicates regions where the magnetic field is stronger outside the magnet. What happens to the magnetic field when the current in the circuit is reversed?

A chemical reaction in which exchange of ions occurs between the reactants is known as ______.

How is a solenoid prepared?

Differentiate between a circular coil and a solenoid.

Write balanced chemical equation for the following word equation.

Lead nitrate + Potassium iodide → Lead iodide + Potassium nitrate

Is this a double displacement reaction? Justify your answer. Name the compound precipitated and write the ions present in it.

Write the method of preparation of Ca(OH)₂. What happens when CO₂ is passed through it? Write balanced chemical equation for the reaction involved.

Give an example of a double displacement reaction.

Define ‘redox reaction’. Give one example.

What is an oxidising agent?

Why does the colour of copper sulphate solution change when an iron nail is dipped in it?

Identify the substances that are oxidised and the substances that are reduced in the following reaction.

\[\ce{4Na(s) + O2(g) -> 2Na2O(s)}\]

Which of the statements about the reaction below are incorrect?

\[\ce{2PbO(s) + C(s) → 2Pb(s) + CO2(g)}\]

1. Lead is getting reduced.
2. Carbon dioxide is getting oxidised.
3. Carbon is getting oxidised.
4. Lead oxide is getting reduced.

 Explain the following in term Oxidation of gain or loss of oxygen with two example.

A shiny brown-coloured element ‘X’ on heating in air becomes black in colour. Name the element ‘X’ and the black-colored compound formed.

Judge the equivalent resistance when the following are connected in parallel − (a) 1 Ω and 10⁶Ω, (b) 1 Ω and 10³Ω and 10⁶Ω.

A piece of wire of resistance R is cut into five equal parts. These parts are then connected in parallel. If the equivalent resistance of this combination is R’, then the ratio `"R"/"R'"` is ______.