Class 6 Changes Around Us CBSE Questions & Answers

Class 6 · Changes Around Us

This is Science Class 6 Changes around Us CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
Metals on heating expand. This is an example of
  • A
    Non-periodic change
  • B
    Physical change
    Correct
  • C
    Chemical change
  • D
    Periodic change
2
Which of the following change can not be reversed?
  • A
    Opening of door
  • B
    Melting of ice
  • C
    Freezing of ice-cream
  • D
    Hardening of cement
    Correct
3
When an iron ring is heated which of the following occurs?
  • A
    The remain of same size
  • B
    The in ring can be reversed
  • C
    The ring expands
    Correct
  • D
    The ring contract
4
Which of the following change can be reversed?
  • A
    Melting of wax and solidifying of melted wax
    Correct
  • B
    All of the above
  • C
    Solidifying of melted wax and increase in size of candle
  • D
    Burning of candle and melting of wax
5
The salt dissolved in water can be separated because it is a
  • A
    Temporary change
  • B
    Physical change
    Correct
  • C
    Undesirable change
  • D
    Desirable change
6
Rolling of chapatti and baking of chapatti are
  • A
    Both are chemical change
  • B
    Physical and chemical change respectively
    Correct
  • C
    Both are physical change
  • D
    Chemical and physical change respectively
7
Iron rim is heated before placing on a wooden wheel because
  • A
    Iron contract on heating
  • B
    Iron become shiny after heating
  • C
    Iron expands on heating
    Correct
  • D
    Iron on heating becomes stronger
8
Burning of wood can
  • A
    Can be reversed
  • B
    Can be expanded
  • C
    Cannot be expanded
  • D
    Cannot be reversed
    Correct
9
When water is mixed with plaster of Paris it becomes
  • A
    Elastic
  • B
    Very hard
    Correct
  • C
    Very soft
  • D
    Soft
10
When iron blade is fixed to wooden handle it is fitted
  • A
    By cooling than heating
  • B
    By boiling than cooling
  • C
    By heating than cooling
    Correct
  • D
    By freezing
11
Which of the following is an exothermic reaction?
  • A
    All of these
  • B
    Adding water to lime
    Correct
  • C
    Melting of ice
  • D
    Tearing of paper
12
When carbon dioxide is passed through lime water, it turns milky due to formation of
  • A
    Carbon monoxide
  • B
    Insoluble calcium carbonate
    Correct
  • C
    Soluble calcium carbonate
  • D
    Carbon hydrogen carbonate
13
During respiration, digested food is used to produce energy in presence of oxygen. It is an example of
  • A
    Chemical and permanent change
    Correct
  • B
    Physical and temporary change
  • C
    Physical and exothermic change
  • D
    Chemical and endothermic change
14
During photosynthesis, green plants prepare food in food in presence of sunlight. It is an example of
  • A
    Temporary and endothermic reaction
  • B
    Temporary and exothermic reaction
  • C
    Permanent and exothermic reaction
  • D
    Permanent and endothermic reaction
    Correct
15
Which of the following is not a characteristic of chemical change?
  • A
    Evolution of gas
  • B
    Change in state
    Correct
  • C
    Formation of precipitate
  • D
    Change in colour