English Medium इयत्ता १० - CBSE Question Bank Solutions

Give reasons for the following:
The reaction of iron (III) oxide [Fe₂O₃] with heated aluminum is used to join cracked machine parts.

Answer the following question.
What is methane?

Answer the following question.
Draw methane electron dot structure.

Answer the following question.
Name the type of bonds formed in the methane compound.

Answer the following question.
Why are methane compounds have poor conductors of electricity?

Answer the following question.
Why are methane compounds have low melting and boiling points?

Answer the following question.
What happens when methane compound burns in oxygen?

Which of the following is a displacement reaction?

\[\ce{Pb + CuCl2 -> PbCl2 + Cu}\]

The above reaction is an example of:

Carbon exists in the atmosphere in the form of ______.

The portion left on dropping a hydrogen atom from an alkane is called ______.

A part of the body which responds to the instructions sent from the nervous system is called ____________.

Reflex arc is formed by:

The property of self-linkage among identical atoms to form long chain compounds is known as ______.

Assertion: Reflex Arc works faster than the thinking process of the brain.

Reason: Reflex Arc works in the case of those animals who do not have a thinking process.

Materials which allow larger currents to flow through them are called:

The element used almost exclusively for filaments of incandescent lamps:

The effective resistance between A and B is:

A cylindrical conductor of length l and uniform area of cross-section A has resistance R. Another conductor of length 2l and resistance R of the same material has an area of cross-section:

Assertion: Conductors allow the current to flow through themselves.

Reason: They have free charge carriers.