Sharq science

What is a cell ?

• Smallest unit of a living organism

• A single unit

• Smallest unit of a dry cell

• Part of a non-living thing

What is the function of the vacuole ?

• Gets rid of waste materials

• Supports the cell and gives it shape

• Stores food substances such as sugars and salts for the cell

• Break down food to produce energy

What is the formula for kinetic energy

• K.E=1/2 mv²

• K.E = v + ut

• K.E = m×g×h

• K.E=m×g

Why do solids have a fixed shape?

• Strong force of attraction

• Weak force of attraction

• Because they vibrate about their positions

• Have a definite volume

Which of the following are advantages of crop rotation

• cycles of pests are disrupted

• Crop rotation controls soil erosion

• They improve nitrogen status of the soil

• Reduction in risk of total crop failure

When colorless lime water turns milky or chalky, this shows the :

• Presence of oxygen

• Presence of ammonia

• Presence of nitrogen

• Presence of carbon dioxide

A little boy of mass 100kg is placed at a height of 2m above the ground. What is the potential energy of the boy with reference to the ground if g=10m/s²

• 200 J

• 2000 J

• 2000N

• 200N

Dry cells in torches convert:

Chemical energy > (a)   > Light + heat energy

Shadow formed by a point source of light is

• Umbra

• Penumbra

• Eclipse

• Darkness

Shadow formed by an extended or larger source of light is

• Umbra

• Penumbra

• Eclipse

• Darkness