Mark the incorrect match.
(i) Winnowing-Different weights of the components
(ii) Filtration-Soluble solids
(iii) Handpicking-Different shapes and sizes of the components
(iv) Distillation-Difference in boiling points of immiscible liquids
A(i) and (iii) only
B(i) and (ii) only
C(ii) and (iv) only
the answer is C !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
There is a mistake in the following classification.
Which of the following is placed incorrectly in the groups ?
Read the given statements 1 and 2 and select the option which correctly identifies X, Y and Z.
1. X is the substance that dissolves into Y.
2. X and Y together form Z.
A X-Solute, Y-Solution, Z-Solvent
B X-Solution, Y-Solvent, Z-Solute
C X-Solvent, Y-Solute, Z-Solution
D X-Solute, Y-Solvent, Z-Solution
Which invention has been the most helpful in allowing people to communicate quickly with each other?
The movements of the hot and cold air set up a convection current. This explains why
A An air conditioner is always placed near the top of the wall.
B A heater is always placed as low as possible in room
C The back of a refrigerator is often painted black.
D Both a and b.
A light steel bar and a light iron bar are attracted to a magnet for a long time as shown in the figure. What will possibly happen when the magnet is removed?
AThe steel and iron bars repel each other.
BBoth steel and iron bars lose their magnetism.
CSteel bar retains its magnetism and iron bar loses its magnetism.
DIron bar retains its magnetism and steel bar loses its magnetism.
Read the following characteristics of a fibre and identify it.
(i) It can be worn close to skin because static electricity does not build up readily.
(ii) Each fibre is made up of 20-30 layers of coiled cellulose springs.
(iii) It has moisture absorbing quality.
(iv) It has natural twist that makes it suitable for spinning.