National Science Olympiad Forum By SOF Olympiad Trainer - Page 219

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 6
Granite is not an igneous rock. It is a metamorphic rock. Please correct!

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Subject :NSO    Class : Class 9

Find out the incorrect statement.

A Osmosis is a slow process, occurs down the concentration gradient and does not expend energy.
B Electron microscope uses very high voltage electricity. It uses electromagnets instead of glass lenses and beam of electrons instead of light.
C A semipermeable membrane does not allow both solvent and solute molecules to pass through it.
D Active transport of materials is rapid and usually occurs against the concentration gradient involving carrier proteins and energy in the form of ATP.


We've to find an incorrect statement....The answer given i.e. C is a correct statement.....So it is not the right answer....Please give a correct answer...Thank you

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Subject :NSO    Class : Class 4

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Subject :NSO    Class : Class 9

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Subject :NSO    Class : Class 9

When an ideal simple pendulum oscillates between the extreme points P and Q, there is continuous (i) of potential energy and kinetic energy. The potential energy depends on the choice of (ii) . Force acting on the bob of the pendulum is maximum at (iii), and minimum at (iv).

(i) (ii) (iii) (iv)
A Dissipation reference level mid point extremes
B Dissipation mass mid point extremes
C Exchange reference level extremes mid point
D Exchange velocity extremes mid point


Ans 1:

Class : Class 9
Answer is CPotential energy depends on refernce .. nothing else

Ans 2:

Class : Class 9
Answer is CPotential energy depends on refernce .. nothing else

Ans 3:

Class : Class 10
the answer must be C) Potential energy never wins on velocity

Ans 4:

Class : Class 9
yes it should be C

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Subject :NSO    Class : Class 6

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 4
you stink

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Subject :NSO    Class : Class 9

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Subject :NSO    Class : Class 8

Consider the following statements (a - d) each with one or two blanks.
I. In our body, _(1)_ is the longest cell while _(2)_ is the smallest cell.
II. Cell membrane in animal cells is _(3)_
III. Mitochondria is absent in _(4)_
IV. _(5)_ are membraneless organelles of cell and are involved in synthesis of _(6)_
Select the correct option to fill any three or four blanks.

A1 - Neuron, 2 - PPLO , 4 - bacteria
B3 - Permeable , 5 - Ribosomes, 6 - proteins
C3 - Selectively permeable , 1 - Neuron, 2 - RBC
D3 - Impermeable , 4 - human RBCs , 6 - lipids


Ans 1:

Class : Class 10
C

Ans 2:

Class : Class 10
C

Ans 3:

Class : Class 6

Ans 4:

Class : Class 8
In my opinion, neither of the options fulfils the blanks correctly. According to the solution, the smallest cell in the human body (assuming the pronoun 'our' refers to the human race) is RBC (erythrocyte), but it is, in fact, the second smallest cell. The smallest cell in the human body is the sperm cell. Thus, option (A) and option (C) are incorrect. PPLO (Pleuro-pneumonia-like-organism) are the smallest cells, but they are not human cells. RBC are the second smallest cells in the human body, not the smallest cell. Option (B) and option (D) are incorrect too. The cell membrane is neither completely permeable, nor impermeable. The cell membrane is selectively permeable, which means it allows only certain molecules to enter and exit the cell. Thus, none of the options are correct.

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Subject :NSO    Class : Class 1

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