1. A
   Light-emitting diode
2. B
   Laser diode
3. C
   Solar cell
4. D
   Transistor

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1. A
   Land improvement
2. B
   Implementation of land reforms
3. C
   Land consolidation and soil conservation
4. D
   Regulation of land revenue

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

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1. A
   Palakapya
2. B
   Vagbhata
3. C
   Sushruta
4. D
   Charaka

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1. A
   Cuttack
2. B
   Murshidabad
3. C
   Surat
4. D
   Calicut

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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
   quaternary activities
2. B
   quinary activities
3. C
   tertiary activities
4. D
   secondary activities

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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
   1
2. B
   2
3. C
   3
4. D
   None

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1. A
   Infrasonic waves
2. B
   Sound waves in audible range for human beings
3. C
   Ultrasonic waves
4. D
   All of the above

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1. A
   The speed of sound waves in steel is higher than that in water.
2. B
   The speed of sound waves in air decreases with increase in temperature.
3. C
   The speed of sound waves in air increases with increase in temperature.
4. D
   The speed of sound waves in water is higher than that in air.

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1. A
   auditory nerve
2. B
   cochlea
3. C
   eardrum
4. D
   eustachian tube

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1. A
   Aluminium
2. B
   Silver
3. C
   Copper
4. D
   Tungsten

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1. A
   $0 \cdot 3 \text{ m s}^{-1}$
2. B
   $3 \text{ m s}^{-1}$
3. C
   $-3 \text{ m s}^{-1}$
4. D
   $-0 \cdot 3 \text{ m s}^{-1}$

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1. A
   electrical signals to sound waves
2. B
   sound waves to electrical signals
3. C
   microwaves to sound waves
4. D
   sound waves to microwaves

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1. A
   2
2. B
   4
3. C
   6
4. D
   8

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1. A
   $\frac{\pi}{12}$
2. B
   $\frac{\pi}{3}$
3. C
   $\frac{\pi}{4}$
4. D
   $\frac{\pi}{6}$

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1. A
   $p\Delta$
2. B
   $q\Delta$
3. C
   $(p+q)\Delta$
4. D
   $pq\Delta$

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1. A
   $2^n$
2. B
   $2^n - 1$
3. C
   $2^{n-1}$
4. D
   $2^n - 2$

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1. A
   32
2. B
   -64
3. C
   -128
4. D
   64

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1. A
   zero
2. B
   one
3. C
   two
4. D
   four

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1. A
   0
2. B
   1
3. C
   2
4. D
   4

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1. A
   $k < 0$
2. B
   $k \leq 0$
3. C
   $k < 1$
4. D
   $k \leq 1$

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1. A
   0
2. B
   1
3. C
   2
4. D
   3

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

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