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.
Monty fully filled a glass bottle with water, put a stopper on it and placed it upright in the freezer overnight. When he looked at it in the morning, the stopper was out of the bottle and a column of ice had emerged through the opening of the bottle.
Which one of the following is the best explanation for what Monty had observed?
AThe bottle had contracted when it was put in the freezer and the water could no longer fit into it.
BExtra water condensed from the air in the freezer and then froze to form the column of ice.
CThe bottle and the stopper contracted more than the water, allowing it to pour out and form the ice column.
DThe volume of water had increased when the water froze, forcing the stopper out of the bottle and forming the column of ice.
Find the missing number, if a certain rule is followed in the following figures.