Download App

Model Paper 1 — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceModel Paper 11 Mark
MCQ
Assertion (A): Atom is electrically neutral.
Reason (R): A neutral particle, neutron is present in the nucleus of atom.
  • A
    Both A and R are true and R is the correct explanation of A
  • ✓
    Both A and R are true but R is not the correct explanation of A.
  • C
    A is true but R is false.
  • D
    A is false but R is true
✓

Answer

Correct option: B.
Both A and R are true but R is not the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
Explanation: Atom is electrically neutral because the number of protons (positively charged particle) is equal to the number of electrons (negatively charged particle).

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "Assertion (A) & Reason (B) MCQ" from Model Paper 1→Model Paper 1 — all question types→Science STD 9 question papers→Gujarat Board STD 9 question papers→Gujarat Board question paper generator→

Similar questions

In the following Questions, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:
Assertion: Cell is the structural and functional unit of all living organisms.
Reason: Anything less than the complete structure of a cell does not ensure independent living.
→
Assertion (A): An iron almirah is a solid at room temperature.
Reason (R): Water can flow and it assumes the shape of the containing vessel.
→
Assertion (A): Rutherford's atomic model was that it could not explain the stability of atoms.
Reason (R): Any charged particle during acceleration would radiate energy, and while revolving, it would lose its energy and eventually fall into the nucleus.
→
Assertion: The number of cells in a multicellular organism is inversely proportional to the size of the body.
Reason: All the cells in the biological world are of the same size.
→
In the following questions, a statement of Assertion is given by the corresponding statement of Reason. Of the statements, mark the correct answer as:
Assertion: Birds have pneumatic bones.
Reason: This reduces the body weight for flight.
→
Assertion (A): Solids do not diffuse in air.
Reason (R): The particles are closely packed in solids.
→
In the following questions, a statement of assertion $(A)$ is followed by a statement of reason $(R)$. Mark the correct choice as:
  1. If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
  2. If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
  3. If Assertion is true but Reason is false.
  4. If Assertion is false and Reason is true.
  5. If both Assertion and Reason are false.
Assertion: Atomicity of $O_3$ is $3$.
Reason: $1$ mole of an element contains $6.023 \times 10^{23}$​​​​​​​ atoms.
→
In the following questions, a statement of Assertion is given by the corresponding statement of Reason. Of the statements, mark the correct answer as:
Assertion: Pinus is a monocot plant.
Reason: It does not bear seeds.
→
In the following Questions, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:
Assertion: Atomic number is equal to number of protons only in case of ions.
Reason: Atomic number is equal to number of protons or electrons even in an ion.
→
In the following questions, a statement of Assertion $(A)$ is followed by a statement of Reason $(R)$. Mark the correct choice as:
Assertion: Liquids diffuse less easily as compared to gases.
Reason: Intermolecular forces are greater in gases.
→