Question Text
Question 1 :
Mohan uses one television of $100$ W for $10$ hrs how much energy is consumed by Mohan.
Question 2 :
What does the slope of work-time curve at any instant represent?
Question 3 :
An engine lifts a load of $1200\ N$ from a depth of $200 \ m$ in 4  minutes bringing it to the ground level. The power developed by the engine is:
Question 9 :
Assertion: Kilowatt Hour is the unit of electric power
Reason: KWH is a commercial unit used for expressing consumed electrical energy.
Question 11 :
A car of masses $1500$kg is lifted up a distance of $30$m by crane $A$ in $0.5$ minutes. The second crane $B$ does the same job in $1$ minute. The ratio of their powers is:
Question 12 :
A photographic plate records sufficiently intense image when exposed with $10$ $W$ source for 12 s. How much time it will take if exposed with $12$ $W$ source:
Question 13 :
A man $M_1$of mass 80 kg runs upa staircase in 15 sAnother man $M_2$also of mass 80 kg runs up thestair case in 20 s.The ratio ofthepower developed by them $(P_1/P_2)$ will be :
Question 14 :
A communication satellite of earth which takes $24 hr$. to complete one circular orbit eventually has to be replaced by another satellite of double mass. If the new satellites also has an orbital time periodof $24 hrs$, then what is the ratio of the radius of thenew orbit to the original orbit ?
Question 15 :
A machine raises a load of $750N$ through a height of $16m$ in $5s$. Calculate the power at which the machine works.<br/>
Question 16 :
How much water a pump of $2\ kW$ power can raise in one minute to a height of $10\ m$? $(g = 10\ m/s^{2})$
Question 17 :
If Rahul has done the same amount of work in less time compared to Rohan then :<br/>
