Which one of these has voids? Enter 1 for first and 2 for second.

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Solution

Voids are nothing but the empty spaces within the cube. In the case of the Rubik's cube, the entire cube is occupied by cubes of smaller sizes (assuming a perfect scenario) and there is absolutely no gap in between.

But in the second case, we see that an unknown fraction of the space within the cube is occupied by the spheres but the rest of it is unoccupied. This unoccupied space is referred to as the 'voids' in the cube.

But there is no name given to this void since it is not in any particular shape which is of scientific significance. You can give it a name of your own for fun!

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Q. There are three ionic compounds, first compound has fcc lattice of anions and cations are present in all tetrahedral voids, second compound has fcc lattice of anions and cations are present in all octahedral voids and the third compound has simple cubical lattice in which cubical void is occupied by cation, then the order of packing efficiency of these will be :

Q. Two particles A and B start from rest and move for equal time on a straight line. The particle A has an acceleration a for the first half of the total time and 2a for the second half. The particle B has an acceleration 2a for the first and a for the second half. Which particle has covered larger distance?

Which of the following is not true about the voids formed in 3 dimensional hexagonal close packed structure ?

(a) A tetrehedral void is formed when a sphere of the second layer is present above triangular void in the first layer

(b) All the triangular voids are not covered by the spheres of the second layer

(c) Tetrahedral voids are formed when the triangular voids in the second layer lie above the triangular voids in the first layer and the triangulare shapes of these voids do not overlap

(d) Octahedral voids are formed when the triagular voids in th second layer exactly overlap with similar voids in the first layer

Q. Two particles P and Q start from rest and move for equal time on a straight line. Particle P has an acceleration of

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for the first half of the total time and

2 x m / s^{2}

for the second half. Particle Q has an acceleration of

2 X m / s^{2}

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X m / s^{2}

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Q. In a compound,

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.
If true enter 1, else enter 0.

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Which one of these has voids? Enter 1 for first and 2 for second. ___

Which one of these has voids? Enter 1 for first and 2 for second.

___