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1. A
   Effector—sensory neuron—spinal cord—motor neuron—receptor
2. B
   Receptor—sensory neuron—spinal cord—motor neuron—effector
3. C
   Receptor—sensory neuron—brain—motor neuron—effector
4. D
   Sensory neuron—receptor—brain—effector—motor neuron

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1. A
   $N$ and $2N$
2. B
   $2N$ and $2N$
3. C
   $N$ and $3N$
4. D
   $2N$ and $3N$

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1. A
   $\frac{2}{5}R$
2. B
   $\frac{3}{5}R$
3. C
   $\frac{3}{2}R$
4. D
   $4R$

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1. A
   $0$ °C
2. B
   $-100$ °C
3. C
   $-273\cdot15$ °C
4. D
   $-173\cdot15$ °C

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1. A
   1, 2 and 3
2. B
   1 and 2 only
3. C
   2 and 3 only
4. D
   1 only

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1. A
   $T$
2. B
   $2T$
3. C
   $4T$
4. D
   $T/2$

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1. A
   Red—live wire, Green—neutral wire, Black—ground wire
2. B
   Red—neutral wire, Green—ground wire, Black—live wire
3. C
   Red—live wire, Green—ground wire, Black—neutral wire
4. D
   Red—ground wire, Green—live wire, Black—neutral wire

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1. A
   $R_1 > R_2 > R_3$
2. B
   $R_1 < R_3 < R_2$
3. C
   $R_3 < R_1 < R_2$
4. D
   $R_3 > R_2 > R_1$

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1. A
   1 and 3 only
2. B
   1 and 4
3. C
   2, 3 and 4
4. D
   1, 2 and 3

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1. A
   $g_1$
2. B
   $2g_1$
3. C
   $g_1/2$
4. D
   $g_1/4$

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1. A
   A-3, B-1, C-4, D-2
2. B
   A-3, B-4, C-1, D-2
3. C
   A-2, B-4, C-1, D-3
4. D
   A-2, B-1, C-4, D-3

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1. A
   A-1, B-4, C-2, D-3
2. B
   A-1, B-2, C-4, D-3
3. C
   A-3, B-4, C-2, D-1
4. D
   A-3, B-2, C-4, D-1

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1. A
   Jamuna
2. B
   Padma
3. C
   Ganga
4. D
   Brahmaputra

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1. A
   Manipur
2. B
   Mizoram
3. C
   Tripura
4. D
   Nagaland

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1. A
   Cirrocumulus
2. B
   Cumulus
3. C
   Nimbostratus
4. D
   Cumulonimbus

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1. A
   A-3, B-1, C-4, D-2
2. B
   A-3, B-4, C-1, D-2
3. C
   A-2, B-4, C-1, D-3
4. D
   A-2, B-1, C-4, D-3

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1. A
   Heat
2. B
   Compression
3. C
   Decomposition
4. D
   Solution

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1. A
   NaOH
2. B
   KCl
3. C
   $\text{FeCl}_3$
4. D
   NaCl

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1. A
   $\text{NaOH} + \text{HCl} \rightarrow \text{NaCl} + \text{H}_2\text{O}$
2. B
   $\text{CaO} + \text{H}_2\text{O} \rightarrow \text{Ca(OH)}_2$
3. C
   $2\text{Mg} + \text{O}_2 \rightarrow 2\text{MgO}$
4. D
   $\text{Na}_2\text{SO}_4 + \text{BaCl}_2 \rightarrow \text{BaSO}_4 + 2\text{NaCl}$

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1. A
   Ammonium nitrate
2. B
   Ammonium sulphide
3. C
   Ammonium phosphate
4. D
   Ammonium sulphate

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1. A
   $\text{CaSO}_4 \cdot 2\text{H}_2\text{O}$
2. B
   $\text{Ca}_2\text{SiO}_4$
3. C
   $2\text{CaSO}_4 \cdot \text{H}_2\text{O}$
4. D
   $\text{CaSO}_4$

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1. A
   A given compound always contains exactly same proportion of elements.
2. B
   When gases combine in a reaction, they do so in a simple ratio by volume, provided all gases are at room temperature.
3. C
   Matter can neither be created nor destroyed.
4. D
   Equal volumes of all gases at same temperature and pressure contain equal number of molecules.

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1. A
   $1$ Å
2. B
   $1$ $\mu$m
3. C
   $1$ mm
4. D
   $1$ cm

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1. A
   $8$ m/s$^2$
2. B
   $12$ m/s$^2$
3. C
   $2$ m/s$^2$
4. D
   $-1$ m/s$^2$

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1. A
   +2 dioptre
2. B
   +0·02 dioptre
3. C
   −0·5 dioptre
4. D
   +0·5 dioptre

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