Test Details

Work and Energy

Study point tution

Jan 10, 3:10 PM

60 minutes

Jan 11, 4:00 PM

55.0 marks

MCQ

35 questions

STUDY POINT CBSE ICSE

YOUR SUCCESS IS OUR SUCCESS

Class Details

Maths

Science

Class 9

Maths

Science

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Question Text

Question 2 :
If a man of $30$ kilograms climbs stairs in $4$ seconds when height of stairs is $5$ meters, power output produced will be:<br/>

Question 3 :
Fill in the blanks:One kilowatt is equal to ________ horse power.

Question 5 :
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 7 :
Which of the following must be known in order to determine the power output of an automobile? <br>

Question 9 :
A car of mass $2,000 kg$ is lifted up a distance of $30 m$ by a crane in $1\ minute$. A second crane does the same job in $2\ minutes$. The power supplied by second crane is:

Question 10 :
A machine gun fires $420$ bullets $per\ minute$. The velocity of each of the bullets is $300 m s^{-1}$ and the mass of each bullet is $1 gm$. The power of machine gun is:

Question 11 :
A man can lift a block of mass of 50 kg up to a height of 2 m in 2 seconds. Calculate the power developed by the man to lift the block.

Question 12 :
How much energy does a 60W electric bulbtransfer in 1 minute?

Question 16 :
What does the slope of work-time curve at any instant represent?

Question 17 :
A house uses 7 tubelight of 50 W each for 5 hours a day. The electrical energy consumption for one day is:

Question 18 :
Mohan uses one television of $100$ W for $10$ hrs how much energy is consumed by Mohan.

Question 21 :
A car of mass $2,000 kg$ is lifted up a distance of $30 m$ by a crane in $1\ minute$. A second crane does the same job in $2\ minutes$.The power supplied by first crane is:

Question 24 :
If the force applied is $F$ and the velocity gained is $v$, then the power developed is:

Question 26 :
How much power must a motor supply to pull a $1000 kg$ box along a horizontal surface if the box is to move at a constant rate of $2 {m}/{s}$, if the coefficient of kinetic friction between the box and the surface is $\mu = 0.3$?

Question 27 :
The moon revolving round the earth in circular orbit is held by the gravitational force of the earth exerted on the moon. Does this gravitational force do any work on the moon?

Question 28 :
An engine pumps a liquid of density d continuously through a pipe of area of cross section A. If the speed of the liquid through the pipe is v, then the power of the engine is

Question 29 :
An electric motor of power $100W$ is used to drive the stirrer in a water bath. If $50$% of the energy supplied to the motor is spent in stirring the water, find the work done on water in one minute.

Question 30 :
A man weighing $70$ kg climb staircase with a speed of $10$ steps/min.If the height of each step is $20$ cm, the power consumed is

Question 31 :
In a certain region of space, the gravitational field is given by $-\dfrac {k} {r}$, where r is the distance and k is a constant. If the gravitational potential at$ r = r_0$ be $V_0$, then what is the expression for the gravitational potential (V).

Question 32 :
A particle of mass $m$ is projected from the surface of earth with a speed $V_{0}$ ($V_{0}$ < escape velocity). The speed of the particle at a height h$=$R (radius of the earth) is<br/>

Question 33 :
A body is thrown from the surface of the earth with velocity $\sqrt{(g{R}_{e})/2}$, where ${R}_{e}$ is the radius of the earth at some angle from teh vertical. If the maximum height reached by the body is ${R}_{e}/4$, then the angle of projection with the vertical is<br/>

Question 34 :
The power of engine of a car of mass 12  kg is 25 kW. The minimum time required to reach a velocity of 90 km/h by the car after starting from rest is:

Question 35 :
The change in potential energy, when a body of mass $m$ is raised to a height $nR$ from the earth's surface is $(R=$ radius of earth$)$

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