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Science Do as directed; [1 M ]

Work and Energy · MP Board (MPBSE) STD 9 (Madhya Pradesh - English Medium). 53 questions.

Questions · Page 2 of 2

Do as directed; [1 M ]

Question 511 Mark
What should be the angle between the direction of force and the direction of motion of a body so that the work done is zero?
Answer
The work done will zero when angle between the direction of force and direction of motion is 90° because, $\text{W} =\text{F}\cos\theta\times\text{s}.$ And $\cos\theta\ 90^\circ=0$
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Question 521 Mark
Define kilowatt-hour.
Answer
One kilowatt-hour is the amount of electrical energy consumed when an electrical appliance having power of $1$ kilowatt is used for $1$ hour.
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Do as directed; [1 M ] - Page 2 - Science STD 9 Questions - Vidyadip