Test Details

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Work, Energy and Power

Mar 10, 10:36 AM

30 minutes

Mar 10, 11:06 AM

15.0 marks

MCQ

15 questions

Er R E Khan

Er R E Khan Ex fellow GNA Udyog ltd Maruti Suzuki India ltd 10 years teaching Experience.

Class Details

Electrostatic

Physics@AOP12th

Electrostatic

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Question Text

Question 1 :
In a factory, due to a sudden strike the work usually done in a day took a longer time. Which of the following happened?

Question 2 :
A ball of mass $m$ is thrown vertically up with an initial velocity so as to reach a height $h$. The correct statement is:

Question 3 :
Two bodies of equal weight are kept at heights of $h$ and $1.5  h$ respectively. The ratio of their P.E. is

Question 4 :
Calculate the work done in lifting  water of 200 kg through a vertical distance of 6 m. $\left ( g=10  m  s^{-2} \right )$<br/>

Question 5 :
Name the type of energy (kinetic energy $K$ or potential energy $U$) possessed in a compressed spring:

Question 6 :
A machine gun fires 360 bullets per minute. Each bullet moves with a  velocity of 600 ms$^{-1}$. If the power of the gun is 5.4 kw, the mass of each bullet is,

Question 7 :
A body of mass $1kg$ falls from a height of $5m$. How much energy does it possess at any instant? (Consider $g=10ms^{-2}$)

Question 8 :
A man of 30 kg jumps up to a height of 2 m . What is his potential energy at the highest point ? 

Question 9 :
Find the gravitational potential energy of a $1kg$ mass kept at a height of $5m$ above the ground if $g=10ms^{-2}$.

Question 10 :
A light bulb has the rating 100 W, 220 V. If the supply voltage is 110 V, then power consumed by the bulb is

Question 11 :
A ball tied at the end of a string and swinging back and forth, at what point in the swing would the ball have the highest potential energy?<br/>

Question 12 :
Two bodies of equal masses are placed at heights $h$ and $2h$. Find the ratio of their gravitational potential energies.

Question 13 :
<p>Two bodies of equal weight are kept at heights of $h$ and $1.5 h$ respectively. The ratio of their P.E. is:</p>

Question 15 :
A man of mass $50kg$ climbs up a ladder of height $10m$. Calculate the increase in his potential energy. $(g=9.8ms^{-2})$

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