List of practice Questions

What does Mandela mean when he says he is “simply the sum of all those African patriots” who had gone before him?
Why did such a large number of international leaders attend the inauguration? What did it signify the triumph of?
There are two kinds of conflict in the story: between humans and nature, and between humans themselves. How are these conflicts illustrated?
Are there people like Lencho in the real world? What kind of a person would you say he is? You may select appropriate words from the box to answer the question. greedy, naive, stupid, ungrateful,selfish, comical, unquestioning.
Who does Lencho think has taken the rest of the money? What is the irony in the situation? (Remember that the irony of a situation is an unexpected aspect of it. An ironic situation is strange or amusing because it is the opposite of what is expected.)
Did Lencho try to find out who had sent the money to him? Why/Why not?
Why does the postmaster send money to Lencho? Why does he sign the letter ‘God’?
Who does Lencho have complete faith in? Which sentences in the story tell you this?
What is the difference between the manner in which movement takes place in a sensitive plant and the movement in our legs?
Compare and contrast nervous and hormonal mechanisms for control and coordination in animals.
How are involuntary actions and reflex actions different from each other?
How does chemical coordination occur in plants?
Which signals will get disrupted in case of a spinal cord injury?
Give reasons why copper is used to make hot water tanks and not steel (an alloy of iron).
A man went door to door posing as a goldsmith. He promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution. The bangles sparkled like new but their weight was reduced drastically. The lady was upset but after a futile argument the man beat a hasty retreat. Can you play the detective to find out the nature of the solution he had used?
Differentiate between metal and non-metal on the basis of their chemical properties.
You must have seen tarnished copper vessels being cleaned with lemon or tamarind juice. Explain why these sour substances are effective in cleaning the vessels.
Give reasons:
  1. Platinum, gold and silver are used to make jewellery.
  2. Sodium, potassium and lithium are stored under oil.
  3. Aluminium is a highly reactive metal, yet it is used to makeutensils for cooking.
  4. Carbonate and sulphide ores are usually converted into oxides during the process of extraction.
What type of oxides are formed when non-metals combine with oxygen?
How does phototropism occur in plants?
Draw the structure of a neuron and explain its function.
What is the function of receptors in our body? Think of situations where receptors do not work properly. What problems are likely to arise?
The brain is responsible for
The gap between two neurons is called a
Explain the following terms with one example each. 
(a) Corrosion 
(b) Rancidity