Download App

Model Paper 9 — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceModel Paper 92 Marks
Question
Nucleus of an atom has positive charge on it. Establish
✓

Answer

This can be established on the basis of Rutherford experiment. Since some alpha particles were repelled by the nucleus of the atom, it is expected to have the same charge as on alpha particles. Therefore, nucleus of an atom has positive charge.The nucleus of an atom contains two things: Protons and neutrons. Because neutrons have no charge and protons have positive charge, the overall charge of the nucleus is positive.

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 "Que-Ans (Each of 2 Mark )" from Model Paper 9→Model Paper 9 — all question types→Science STD 9 question papers→Gujarat Board STD 9 question papers→Gujarat Board question paper generator→

Similar questions

Using a horizontal force of $200N,$ we intend to move a wooden cabinet across a floor at a constant velocity. What is the friction force that will be exerted on the cabinet?
→
Calculate the force of gravitation between two objects of masses $50 \ kg$ and $120 \ kg$ respectively kept at a distance of $10 \ m$ from one another. (Gravitational constant, $\mathrm{G}=6.7 \times 10^{-11} \mathrm{Nm}^2 \mathrm{~kg}^{-2}$ )
→
What type of digestion takes place in cnidarians?
→
What is economic use of sclerenchyma?
→
Which organelle is the “power plant” of eukaryotic cell. Write in brief its functions.
→
What is the main function of each of the following organelles?
  1. Golgi bodies.
  2. Vacuole.
→
Write down names of three types of endocytosis.
→
Explain by an example that a body may possess energy even when it is not in motion.
→
Define the acute and chronic disease.
→
When ice at $-10^\circ\ C$ is slowly heated, temperature of ice gradually increases till $0^\circ\ C$, the temperature of the system remains constant when the ice change into water and then further rises. Explain the observation.
→