Grade 12 books
๐Welcome to our channel and from this channel you can get a lot of educational materials & Quizzes! Buy ad : https://telega.io/c/grade_12_books1 ๐ from grade 12 books: โ All subject Quiz โ short Note โ work sheet
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Which of the following is FALSE about a reaction at equilibrium?
A. The system is dynamic in nature.
B. The rates of the forward and reverse reactions are necessarily equal.
C. The concentrations of reactants and products are necessarily equal.
D. The state of equilibrium remains the same if there is no change in the external conditions.
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What are the gaps in the myelin sheath called?Anonymous voting
- Nodes of Ranvier
- Dendritic Trees
- Axon terminals
- Schwann cells
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Which part of the nervous system is made up of the brain and spinal cord?Anonymous voting
- Central nervous system
- Peripheral nervous system
- Autonomous nervous system
- nervous system
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Which part of the nervous system is made up of the brain and spinal cord?
A) Central nervous system
B) Peripheral nervous system
C) Autonomous nervous system D) None of the above
2. What is the function of supporting cells (glial cells)?
A) Conduct information away from the cell
B) Aid the function of neurons
C) Receive signals from sensory receptors
D) Insulate the axons
3. What is the function of the axons in a neuron?
A) Receive signals from sensory receptors
B) Transmit information away from the cell
C) Protect the axons with a myelin sheath
D) Insulate the dendrites
4. What are the gaps in the myelin sheath called?
A) Nodes of Ranvier B) Dendritic Trees C) Axon terminals D) Schwann cells
5. What is the function of motor neurons?
A) Conduct impulses from sensory organs
B) Send impulses from the brain to effector organs
C) Only found in the central nervous system
D) Help in speeding up impulse transmission
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What does the principal quantum number (n) determine?Anonymous voting
- The shape of an electrons orbital
- The energy level of an electron
- The orientation of an electrons orbital in space
- The spin of an electrons
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one mole of two different substances A and B have equal______Anonymous voting
- ๐ number of particles
- ๐ molecular weight
- ๐ formula mass
- ๐ percentage compositionโโ
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Which of the following statements is NOT correct about valence bond theory?Anonymous voting
- Valence bond theory assumes that electrons are delocalized in atomic orbitals.
- Valence bond theory can be used to explain the formation of both ionic and covalent bonds.
- Valence bond theory can be used to predict the shape of molecules.
- Valence bond theory can be used to explain the magnetic properties of molecules
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Evolution
1,B
2, C
3, B
4. C
5. B
6, C or biochemical theory
7, ____
8, D
9. C
10. B
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Biology detailed explanation about half life fossil dating as per your request
50% of the existing c-14 will decay after each successful half-life.
Half-life is the time needed for half of the atoms of a radioactive element to decay
After one half โ life 50% will still be radioactive
After a second half-life, 75% will be decayed, 25% of the original will still be radioactive
This means for example if the half life is given as 100 years the fossil remained undecayed is 50% ,then after another 100 year it remains 25% after third 100 year it remains 12.5% for the fourth 100 year it remains 6.25%.it will continoue like that.
I hope you understand it well
Thanks
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