Active Physics

According to work energy principle work done on body will equal to change its

• K.E only

• P.E only

• K.E and P.E both

• All may correct

The average power and instantaneous power become equal if work is done at

• At any rate 

• At uniform rate

• At variable rate

• At high rate

The work done by force “ F ” in figure shown is

• Fd cos θ

• sin θ

• Fd tan θ

• Fd cot θ

Tags

NGSS.HS-PS2-1

Work done by gravity when P.E of body is increased is

• Positive

• Negative

• Zero

• Both positive and negative

If θ > 90⁰ work is said to be

• Negative

• Positive

• Zero

• None of these

Block and tackle system of pulleys is used to raise a load of 500N through a height of 20m. The work done against friction is 2000J. Calculate the work done by the effort

• 12000 J

• 8000 J

• 6000 J

• 4000 J

The amount of work done by a labourer who carries n bricks, each of mass ‘m’, to the roof of a house whose height is h

• nmgh

• (n/2)mgh

• mgh/n

• ngh/m

A light and a heavy body have equal momenta. Which one has greater K.E

• The light body

• The heavy body

• The K.E. are equal

• Data is incomplete

Tags

NGSS.HS-PS2-2

NGSS.HS-PS3-2

Energy time graph is shown in Fig. Power delivered is

• 2.5 W

• 5 W

• 0.2 W

• 0.5 W

Tags

NGSS.HS-PS3-1

• Proton

• Deuterium

• Electron

Tags

NGSS.HS-PS2-2