GK
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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physical quantities which have magnitude only and no direction
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physical quantities which have no magnitude only and only direction
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physical quantities which have magnitude only and direction
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physical quantities which have no magnitude and no direction
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Detailed explanation-1: -A physical quantity which has only magnitude is called scalar quantity eg: speed and distance whereas physical quantities which have both magnitude and direction are called vector quantities eg: velocity and displacement.
Detailed explanation-2: -The quantity “mass” has no direction. It only has a magnitude, typically given in units of kilograms. Therefore, mass is a scalar quantity. It is important not to confuse the physical quantities mass and weight.
Detailed explanation-3: -Scalar quantities have a size or magnitude only and need no other information to specify them. Thus, 10 cm, 50 sec, 7 litres and 3 kg are all examples of scalar quantities. Vector quantities have both a size or magnitude and a direction, called the line of action of the quantity.