Revision Grade 4

Soil is essential for the growth of

• houses

• plants

• plastic

• sunlight

The roots of a plant absorb ______ from the soil

• sunlight

• nutrients

• air

• plastic

The topmost layer of the earth's crust is known as ​ (a)  

• soil
• minerals
• humus
• sand
• pebbles

Which one of the following is a component of soil?

• nutrients

• pebbles

• sunlight

• plastic

______ soil is used for making pottery.

• desert

• sandy

• clayey

• loamy

Friction produces ______ .

• electricity

• sound

• pollution

• heat

Sita is planning to fix the mirror on the wall. Which one of the following simple machines will he use to fix it

• pulley

• wheel and axle

• screw

• wedge

While hoisting the flag on a flagpole, we apply the force in the _______ direction.

• opposite

• downward

• upward

• sideward

Name the component of the soil which is formed by the decomposition of leaves, decayed plant and animal matter.

Match the following

• magnet

• I can pull another object towards me

• mechanical force

• Sir Isaac Newton

• pulley

• Fork

• scientist who discovered gravity

• Wheel and rope

• three or four wedges

•