English Medium Class 10 - CBSE Question Bank Solutions

Show how you would connect three resistors, each of resistance 6 Ω, so that the combination has a resistance of 4 Ω.

One of the constituents of baking powder is sodium hydrogencarbonate. The other constituent is :

How is an electric impulse created in human nervous system? 

Name the salt formed when sulphuric acid is added to sodium hydroxide and write its pH.

An aqueous solution of a salt turns blue litmus to red. The salt could be the one obtained by the reaction of ______.

Consider the following combinations of resistors:

1. 
   
2. 
   
3. 
   
4. 
   
   The combinations having equivalent resistance 1 Q is/are ______.

Trace the sequence of events which occur when you suddenly touch a hot object.

Think of situations where receptors do not work properly. What problems are likely to arise?

State any four characteristics of a homologous series

Write the next homologue of the following: C₂H₄

Write the next homologue of the following: C₄H₆

What is meant by homologous series of carbon compounds?

Classify the following carbon compounds into two homologous series and name them.

C₃H₄, C₃H₆, C₄H₆, C₄H₈, C₅H₈, C₅H₁₀

Write the name and formula of the 2nd member of homologous series having general formula C_nH_2n.

Write the name and formula of the 2nd member of homologous series having general formula C_nH_{2n + 2}.

Write the name and formula of the 2nd member of homologous series having general formula C_nH_{2n – 2}.

Write the molecular formula of two consecutive members of homologous series of aldehydes. State which part of these compounds determines their

1. physical and 
2. chemical properties

An electric lamp of 100 Ω, a toaster of resistance 50 Ω, and a water filter of resistance 500 Ω are connected in parallel to a 220 V source. What is the resistance of an electric iron connected to the same source that takes as much current as all three appliances, and what is the current through it?