Science, asked by madhavjhalawa29, 20 days ago

Assertion Reason type questions

Question number 1 to 5 are are Assertion(A)-Reason(R) type questions. In each of the following question a statement of Assertion is given by the corresponding statement of Reason.

Mark the correct answer as-

(a)lf both assertion and reason are true and reason is correct explanation of assertion
(b)Both assertion and reason are true but reason is not the correct explanation of assertion
(c) Assertion is true but reason is false
(d) Assertion is false but reason is true
(e) Both assertion and reason are false

Q1. (A) Robert brown discovered nucleus
(R) Nucleoplasm And Cytoplasm Of A Living Cell Together Form The Cytoplasm

Q2. (A) Lysosomes are often called as suicidal bags of a cell
(R) Lysosomes contain hydrolytic enzymes capable of digesting cellular waste

Q3. (A) Displacement of body may be zero even when distance is not zero
(R) Displacement and distance both are scalar quantities

Q4. (A) Speed of a body is distance travelled in unit time
(R) Speed is always equal or greater than velocity

Q5. (A) The position time graph of an object in uniform motion is a straight line (R) Uniform motion object covers equal distance in equal interval of time.

Answers

Answered by seemaramtiwari

Question 1

Which of the following is not correct?

(a) Robert Brown discovered the cell.

(b) Schleiden and Schwann formulated the cell theory.

(d) A unicellular organism carries out its life activities within a single cell.

ANSWER

Robert Brown discovered the cell - is a false statement.

The first person to see a cell was Robert Hook. He used a very primitive microscope and observed empty blocks like structure in the cork cells which was named as cell.

Question 2

Answer

Option A: Lysosomes are known as suicidal bags, because sometimes, the digestive enzymes of lysosomes end up damaging lysosomes itself, which results in the death of the cells. This phenomenon is known as autolysis. Hence lysosomes are known as suicidal bags. Therefore, this is the correct option.

Question 3

Answer

Assertion

Displacement of a body may be zero, when distance travelled by it is not zero.

Reason

The displacement is the longer distance between initial and final position.

Correct option is

Assertion is correct but Reason is incorrect

Displacement is the shortest straight line distance between initial and final position.

Hence if a body travels along a random path to return to the point of start, the body has traveled finite distance, however the displacement of it is exactly zero.

Hence correct answer is option C.

Question 4

Answer Therefore, D is the correct option.

Choose the incorrect statement.

The value of distance travelled by amoving body can never be zero or negative

The value of displacement can be positive, zero or negative

The displacement of an object between two points has a unique value

The value of displacement is always greater than the distance travelled

Medium

Answer

Correct option is

The value of displacement is always greater than the distance travelled

Option A-

Distance is scalar quantity it cannot be negative and can not be zero for a moving body. So, it is the correct statement.

Option B-

Displacement is a vector quantity, so the value of displacement can be positive, zero or negative. So, it is also the correct statement.

Option C-

We know that displacement is the shortest distance between two points, which is unique. So, it is also a correct statement.

Option D-

Displacement a vector quantity whose magnitude is equal to the shortest distance between the initial and final points so it can not be greater than the distance. So, Option -D is the incorrect statement.

Therefore, D is the correct option.

Question 5

What is the nature of the distance time graphs for uniform and non-uniform motion of an object moving in a straight line?

What is the nature of the distance time graphs for uniform and non-uniform motion of an object moving in a straight line?A

What is the nature of the distance time graphs for uniform and non-uniform motion of an object moving in a straight line?AUniform: Straight line; Non uniform: Straight line

What is the nature of the distance time graphs for uniform and non-uniform motion of an object moving in a straight line?AUniform: Straight line; Non uniform: Straight lineB

What is the nature of the distance time graphs for uniform and non-uniform motion of an object moving in a straight line?AUniform: Straight line; Non uniform: Straight lineBUniform: Straight line; Non uniform: Curved

Answer

Correct option is

Uniform: Straight line; Non uniform: Curved

The distance time graph for uniform motion is a straight line parallel to the time axis as speed will be constant.

The distance-time graph for non-uniform motion is not a straight line, it can be a curve or a zigzag line as speed is variable.

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