Work and enegy grade 9 (ncert)

What is the commercial unit of energy

• Kwh

• Hp

• Watt

• Joule

Work done upon a body is?

• A) vector quantity

• B) scalar quantity

• C) a and b are correct

• D) none of these

An object of mass 10 kg falls from a height 10m. Kinetic energy gained by the body will be approximately equal to?

• 500j

• 200j

• 100j

• 1000j

The potential energy of a boy is maximum when he is?

• Sleeping

• Standing

• Siiting

• Sitting on chair

The power of a pump which can pump 200kg of water to a height of 200m in 10sec is? Take g as 10)

• 40kw

• 80kw

• 400kw

• 960kw