Energy

What is the law of conservation of energy?

• Energy cannot be created or destroyed, only transferred or transformed.

• Energy can be transformed into matter

• Energy can be destroyed completely

• Energy can be created out of nothing

Why is it important to reduce energy consumption?

• To accelerate climate change and increase energy costs

• To promote sustainability and reduce greenhouse gas emissions

• To increase energy consumption and deplete natural resources

• To conserve natural resources, reduce greenhouse gas emissions, lower energy costs, and promote sustainability.

What is energy?

• The amount of work done

• The ability to do work

• The motion of a body

• None of these

Answer explanation

Energy is the ability to do work

What is the energy possessed by a running car ?

• Potential energy

• Mechanical energy

• Kinetic energy

• Heat energy

Heat energy is measured in ______.

• Calories

• Joules

• 'Celsius

• None of these

The SI unit of work and energy is same.Why?

• Because work is same as energy

• Because work derived from energy

• Because energy is the ability to do work

• None of these

What is the SI unit of work ?

(a)  

Newton metre(Nm) and Joules(J) is same.

• True

• False

Work is appropriately measured by the formula ?

• Fxs

• FxsxCosO

• None of these

Find the work done if the displacement is 5 m and force applied is 5000N.

• 25000Nm

• 25000J

• 25x10^3J

• 25000N/m