Science Revision Ch 1, 5, 12

Petrol is more polluting fuel as compared to CNG

• Yes, because petrol releases more harmful gases
• No, because CNG releases more harmful gases

Answer explanation

Coal and Petroleum are exhaustible natural resource.

• True
• False

Adding grips will reduce friction

• True

• False

Kerosene is not a fossil fuel

• True
• False

Coal Tar is a tough, porous and black solid substance.

• True

• False

The undesirable plants growing around the main crop are called weeds

• True

• False

Pongal and Baisakhi are harvest festival.

• True

• False

A seed drill is used for harvesting crops.

• True

• False

Static friction is always greater than kinetic friction.

• True

• False

Friction is a contact force

• True
• False