Test Details

Work and Energy

Feb 08, 7:46 PM

35 minutes

Feb 08, 8:21 PM

34.0 marks

MCQ

23 questions

19891998

mentor of Maths and science with diverse perspective

Class Details

Maths And Science

CBSE Mentor

Maths And Science

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Question Text

Question 3 :
A man weighing 600 N carries a load of 150 N up the stairs 6 m high in 15 seconds. His power will be:

Question 8 :
Which of the following can be used to express energy? Symbols have their usual meanings for the units of physical quantities. (i) Wh   (ii) VC    (iii) VAs$^2$  (iv)  A$^2\Omega$s

Question 10 :
A machine gun fires $240$ bullets $per\ minute$ with a certain velocity. If the mass of each bullet is $10 gm$ and the power of the gun is $7.2 kW$, the velocity with which each bullet is fired must be:

Question 11 :
If the force applied is $F$ and the velocity gained is $v$, then the power developed is:

Question 13 :
A crane can lift a box of 600 kg mass to a height of 20 m in 2 minutes. Calculate the power at which the crane is operating ?

Question 14 :
Three particles of mass $M$ each are placed at corners of an equilateral triangle of side $'d'$ if the sides are increased to $'2d'$ then :

Question 16 :
The average power required to lift a $100\ kg$ mass through a height of $50 \ m$ in approximately $50\ s$would be:

Question 17 :
An engine pumps up $1000 \kg$ of coal from a mine $100 \ m$ deep in $50 \ sec$. The pumps is running with diesel and efficiency of diesel engine is $25%$. Then its power consumption will be $(g = 10m/sec^2)$:

Question 18 :
Sand is falling on a conveyor belt at rate of 5kg/s. the
extra power required to move the belt with a velocity of 6 m/s is _____ ?

Question 19 :
An elevator is designed to lift a load of $1000\ kg$ through $6$ floors of a building averaging $3.5\ m$ per floor in $6\ s$. Power of the elevator, neglecting other losses, will be:

Question 20 :
The work done to increase the radius of orbit of a satellite of mass $m$ revolving around a planet of mass $M$ from orbit of radius $R$ into another orbit of radius $3R$ is :

Question 21 :
A pumping machine pumps a liquid at a rate of $60\ cc$ per minute at a pressure of $1.5$ atmosphere. power of the machine is:

Question 22 :
The energy consumed by 100 W electric bulb in 5 hours is:

Question 23 :
The radius of earth is about 6400 km and that ofmars is 3200 km. The mass of the earth is 10 times the mass of mars. An object weight 200 N on the surface of earth. Its weight on the surface of marswill be.

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