Question

Assertion : The scalar quantity is always positive.
Reason: Scalar is expressed by direction.
(a) Only Assertion is true Reason is not correct explanation of Assertion
(b) Reason is true
(c) Both Assertion and Reason are true
(d) Both Assertion and Reason are false.​

Answer 1

ANSWER :-  [d] is the correct answer

--> Both assertion and reason are false

Explanation:

before answering this we must know what is a scalar

Scalar :- it is a physical quantity  which has only  magnitude but no direction

Examples :- time , speed , temperature,distance.

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coming to the question ;-  

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Assertion : The scalar quantity is always positive.

lets take the example of temperature , we may say temperature as 42°, 48° and -4° , -8°.

so temperature{scalar quantity} can be negative also proving that assertion is false

" a scalar can either be positive { time, mass } or negative {temperature,charge}

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Reason: Scalar is expressed by direction.

by the definition of scalar ,it cant be expressed in direction .

so the above line proves that reason is also false

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·°· option [d] is correct

Answer 2

Answer:

Option d✓ is the correct answer to your question.

Both assertion and reason are false.

Explanation:

• Scalar quantities can be negative also.
• For example, electric charge is a scalar quantity but it is negative.
• So this proves that the assertion is false.
• Scalars can be negative.
• Now coming to the reason, We know the definition of scalar.
• i.e. Scalar quantities are those quantities which have only magnitude but don't have any direction.
• Vector are the quantities which have direction.
• Hence the reason is also false.