Test Details

Work and Energy

Dec 30, 6:00 PM

100 minutes

Dec 31, 6:00 PM

50.0 marks

MCQ

50 questions

Kanu Da

Abhijit Mondal, BSC In Chemistry Honors From Ramakrishna Mission Residential College, Narendrapur. BE In Mechanical Engineering From Indian Institute Of Engineering Science And Technology, Shibpur. Expert in Mathematics, Mechanical Engineering and SCIENCE

Class Details

MATHEMATICS

Science

Basic Engineering

RRB JE, ALP, Technician

MATHEMATICS

Science

Basic Engineering

Eligible criteria for ALP and Technician - 12th pass with ITI, or Diploma /Btech in Mechanical or in Electrical. For ALP should be physically fit and eye 6/6. RRB JE - Diploma or Btech in Mechanical Engineering.

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Question Text

Question 1 :
If $v$, $P$ and $E$ denote the velocity, momentum and kinetic energy of the particle, then:<br/>

Question 3 :
A juggler throws continuously balls at the rate ofthree in each second each with a velocity of $10\ ms^{-1}$. If the mass of each ball is $0.05\ kg$ hispower is:

Question 6 :
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 7 :
A house uses 7 tubelight of 50 W each for 5 hours a day. The electrical energy consumption for one day is:

Question 9 :
If the force applied is $F$ and the velocity gained is $v$, then the power developed is:

Question 10 :
An X-ray tube is run at 50 kV.. the current flowing in it is 20 mA. The power of the tube is:

Question 11 :
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 14 :
How much energy does a 60W electric bulbtransfer in 1 minute?

Question 16 :
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 17 :
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 20 :
If the power of the motor of a water pump is $3\ kW$, then the volume of water that can be liftedto a height of $10\ m$ in one minute by the pump is ($g= 10 \ m /s^{2}$) :

Question 21 :
Which of the following can be used to express energy? Symbols have their usual meanings for the units of physical quantities.<br/>(i) Wh   (ii) VC    (iii) VAs$^2$  (iv)  A$^2\Omega$s<br/>

Question 22 :
Assertion: Kilowatt Hour is the unit of electric power Reason: KWH is a commercial unit used for expressing consumed electrical energy.

Question 23 :
Six electric appliances of 100 watts each are used for 6 hours. The electrical energy consumed is:

Question 28 :
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 30 :
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 34 :
What does the slope of work-time curve at any instant represent?

Question 35 :
Fill in the blanks:One kilowatt is equal to ________ horse power.

Question 38 :
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 40 :
An engine develops 10 kW of power. How much time will it take to lift a mass of 200kg to a height of 40m (g = 10 $ms^{-2}$)?

Question 42 :
Mohan uses one television of $100$ W for $10$ hrs how much energy is consumed by Mohan.

Question 44 :
The power of a crane is 6.25 kW. How much mass of coal it can lift in 1 hour from a mine of 100 m depth? The efficiency of the crane is 80% and $g = 10 \ m s^{-2}$.

Question 49 :
1 kilowatt-hour is the amount of .... by 1000 watt electric appliance when it operates for one hour.

Question 50 :
A man weighing 600 N carries a load of 150 N up the stairs 6 m high in 15 seconds. His power will be:

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