Work, Energy, Power

The mass of Mr. Shiraz is 20kg. What will be the amount of work done by him if he climbs 20 stairs, each 25 cm high in 10 seconds?

• 900 J

• 1000 J

• 1080 J

• 980 J

What will be the amount of work done to raise a 40N weight 2 meters high and hold for 2 seconds?

• 0 J

• 180 J

• 40 J

• 120 J

What amount of work will be done if 500g mass is moved 1m by applying 2N force?

• 2 J

• 9.8 J

• 4.9 J

• 0.5 J

Which information is not correct regarding work and power?

• To measure power, time is not needed.

• Dimension of work is

  [M L2 T-2]

• Dimension of power is

  [M L2 T-3]

• Unit is work is Joule

How much work in Joules was done by a 100kg mass person to climb down a 6m long ladder while the ladder is at a 30-degree angle with the ground?

• 2940

• 5880

• 5800

• 2900

Unit of work is

• Newton

• Joule

• Watt

• Pascal

What is electron volt?

• The practical unit of work

• Neutral unit of work

• Unit of electricity

• Unit of electric resistance

If a body is raised above the ground, work is done against which force?

• Chemical

• Gravitational

• Frictional

• Electromagnetic

When work done by force will be 0?

• $\theta=45$

• $\theta=$ 60

• $\theta=$ 90

• $\theta=$ 180

 $If\ 0\le\theta\le90\degree$  then work done by force in N is

• Negative

• Positive

• No work is done 

• None of the above