Check sibling questions

Question 1

When ice-cream melts

  1. Heat is lost from the ice-cream
  2. Heat is gained by the ice-cream
  3. Heat is lost the air
  4. Heat is gained by the air

 

Answer:

Heat is gained by the ice-cream. So , the correct option is B.

 

Question 2

Which of the following is a reversible change?

  1. Boiling of an egg
  2. Melting of wax
  3. Boiling of alcohol
  4. Burning of coal 

 

Answer:

Melting of wax. So , the correct option is B.

 

Question 3

When ice melts to form water, then a change occurs on its

  1. State
  2. Position
  3. Temperature
  4. Composition

 

Answer:

When ice melts to form water, then a change occurs in its state.

So , the correct option is A.

 

Question 4

An irreversible change takes place when

  1. Ice melts
  2. Salt is added to water
  3. Charcoal burns
  4. An iron nail is magnetized

 

Answer:

An irreversible change takes place when Charcoal burn s. So , the correct option is C.

 

Question 5

Which of the following is a beneficial change?

  1. Ripening of fruit
  2. Souring of milk
  3. Spoilage of food
  4. Rusting of an iron object

 

Answer:

t Ripening of Fruits is a beneficial change.This is because Ripe fruit is tastier to eat than raw food. So , the correct option is A.

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Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 12 years and a teacher from the past 16 years. He teaches Science, Economics, Accounting and English at Teachoo