1. A
   Calcium oxide
2. B
   Sodium nitride
3. C
   Silicon carbide
4. D
   Zinc sulphide

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1. A
   The number of protons in argon is 22.
2. B
   The number of neutrons in argon is 18.
3. C
   The number of electrons in argon is 18.
4. D
   The sum of numbers of protons and electrons in argon is 40.

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1. A
   $Ne < Mg < N < Si$
2. B
   $Si < N < Mg < Ne$
3. C
   $Ne < N < Si < Mg$
4. D
   $Mg < Ne < N < Si$

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1. A
   there are 6 cycles/s
2. B
   there are 3 cycles/s
3. C
   there are 2 cycles/s
4. D
   there is only 1 cycle/s

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1. A
   $\Omega$
2. B
   $\Omega/\text{m}$
3. C
   $\Omega\,\text{cm}$
4. D
   $\Omega\,\text{m}$

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1. A
   $0\cdot5 \, \text{A}$
2. B
   $0\cdot25 \, \text{A}$
3. C
   $1\cdot0 \, \text{A}$
4. D
   $5\cdot0 \, \text{A}$

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1. A
   inversely on the distance from it
2. B
   directly on the distance from it
3. C
   inversely at short distances and directly at large distances from it
4. D
   directly on the distance (at short distances) and inversely on the distance (at long distances) from it

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1. A
   $ML^3T^{-2}$
2. B
   $M^{-1}L^3T^{-2}$
3. C
   $M^2L^{-2}T^{-2}$
4. D
   $M^2L^{-1}T^{-2}$

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1. A
   $2 \, \text{s}$
2. B
   $3 \, \text{s}$
3. C
   $4 \, \text{s}$
4. D
   $5 \, \text{s}$

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1. A
   $6 \, \text{s}$
2. B
   $4 \, \text{s}$
3. C
   $2 \, \text{s}$
4. D
   $1 \, \text{s}$

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1. A
   1 only
2. B
   2 only
3. C
   Both 1 and 2
4. D
   Neither 1 nor 2

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1. A
   Chloroplast
2. B
   Leucoplast
3. C
   Chromoplast
4. D
   Xanthoplast

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1. A
   In plants, there is a large central vacuole that may occupy 90% of total cell volume.
2. B
   In plant cells, vacuoles provide turgidity and rigidity.
3. C
   In Amoeba, vacuoles have role in nutrition.
4. D
   Vacuoles are absent in animal cells.

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1. A
   Parenchyma
2. B
   Collenchyma
3. C
   Sclerenchyma
4. D
   Complex tissue

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1. A
   Dogfish
2. B
   Jellyfish
3. C
   Silverfish
4. D
   Starfish

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1. A
   Bryophytes
2. B
   Thallophytes
3. C
   Pteridophytes
4. D
   Gymnosperms

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1. A
   AIDS
2. B
   Dengue fever
3. C
   COVID-19
4. D
   Typhoid fever

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1. A
   diffraction of starlight
2. B
   reflection of starlight
3. C
   refraction of starlight
4. D
   dispersion of starlight

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1. A
   zero
2. B
   positive
3. C
   infinite
4. D
   negative

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1. A
   $5\cdot0 \, \text{cm/s}^2$
2. B
   $0\cdot5 \, \text{m/s}^2$
3. C
   $0\cdot5 \, \text{cm/s}^2$
4. D
   $5\cdot0 \, \text{m/s}^2$

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1. A
   $2\cdot15 \, \text{m/s}$
2. B
   $1\cdot89 \, \text{m/s}$
3. C
   $1\cdot51 \, \text{m/s}$
4. D
   $2\cdot51 \, \text{m/s}$

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1. A
   thermal energy
2. B
   potential energy
3. C
   kinetic energy
4. D
   electric energy

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1. A
   $5 \, \text{s}$
2. B
   $4 \, \text{s}$
3. C
   $3 \, \text{s}$
4. D
   $2 \, \text{s}$

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1. A
   1
2. B
   3
3. C
   5
4. D
   7

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1. A
   $AlCl_3 + 3H_2O \rightarrow Al(OH)_3 + 3HCl$
2. B
   $2NaH \rightarrow 2Na + H_2$
3. C
   $4Fe + 3O_2 \rightarrow 2Fe_2O_3$
4. D
   $CuSO_4 + Zn \rightarrow Cu + ZnSO_4$

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