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Define mass.
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Name the instrument which is commonly used to measure the mass of a body. State how is it used?
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Define one kilogram, the S.I. unit of mass.
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Name and define the S.I. unit of time. How is it related to (i) minute (ii) hour, (iii) day, and (iv) year?
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Tick the most appropriate answer.
The SI unit of mass is
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Answer the following in short.
What do you understand by the term ‘mass’? Name any one instrument used for weighing.
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Answer the following in short.
Explain the working of a beam balance.
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Tick the most appropriate answer.
Which of the following devices is used to measure mass?
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Fill in the blank.
The amount of matter contained in a body is known as its ...........
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Solve the following numerical problem.
The masses of five marbles are 50 g, 55 g, 60 g, 65 g, and 70 g. Find their average mass.
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State whether the following statement is True or False.
A pulley changes the direction of force.
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Fill in the blank:
A pulley is used to change ........................
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Select the correct alternative:
A pulley is used because of it
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What is the mechanical advantage of an ideal pulley?
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The mechanical advantage of an actual pulley is less than one. Give a reason. What is the justification for using the pulley then?
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What is the justification for using the pulley then ?
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Draw a neat labelled diagram showing a pulley being used to lift a load. How are load and effort related in an ideal situation?
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State two ways of increasing the strength of an electromagnet
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