1. A
   Away from the observer
2. B
   Constant position
3. C
   Upward from the observer
4. D
   Towards the observer

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1. A
   Current flows from A to B
2. B
   Current flows from B to A
3. C
   Current disconnect at A
4. D
   No current in AB

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1. A
   Field lines forming two separate closed loops above and below the wire.
2. B
   Symmetric concentric circles at top and bottom merging into a dipole envelope, straight through the centre.
3. C
   Dipole envelope with a concentric circle only at the bottom of the wire.
4. D
   Elliptical envelope with nearly straight parallel lines through the centre.

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1. A
   into the page.
2. B
   to the right.
3. C
   out of the page.
4. D
   to the left.

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1. A
   out of the page
2. B
   into the page
3. C
   towards right
4. D
   towards left

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1. A
   forces pointing into the plane of the paper and out of the plane of the paper, respectively
2. B
   forces both pointing into the plane of the paper
3. C
   forces both pointing out of the plane of the paper
4. D
   force pointing opposite and along the direction of the uniform magnetic field respectively

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1. A
   towards left
2. B
   out of the page
3. C
   towards right
4. D
   into the page

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1. A
   concentric circles near the point O but of elliptical shapes as we go away from it
2. B
   straight lines parallel to each other
3. C
   concentric circles
4. D
   elliptical in shape

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1. A
   B
2. B
   B if the current is small and A if the current is large
3. C
   A
4. D
   A if the current is small, and B if the current is large

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1. A
   in the same direction as the current in the wires.
2. B
   zero
3. C
   in the vertically upward direction.
4. D
   in the vertically downward direction.

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1. A
   All of these
2. B
   The direction of underwater objects
3. C
   The speed of underwater objects
4. D
   The distance of underwater objects

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

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

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1. A
   (iii)
2. B
   (ii)
3. C
   (i)
4. D
   (iv)

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1. A
   Quality
2. B
   Amplitude
3. C
   Pitch
4. D
   Wavelength

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1. A
   Reverberation
2. B
   Echo
3. C
   Reflection of sound
4. D
   Multiple reflection

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

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1. A
   5 m s⁻¹
2. B
   4 m s⁻¹
3. C
   8 m s⁻¹
4. D
   10 m s⁻¹

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

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1. A
   (iv)
2. B
   (i)
3. C
   (ii)
4. D
   (iii)

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1. A
   (iv)
2. B
   (ii)
3. C
   (iii)
4. D
   (i)

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1. A
   $P_A > P_B$
2. B
   $P_A < P_B$
3. C
   $P_A = 2P_B$
4. D
   $P_A = P_B$

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

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1. A
   6 cm mark
2. B
   3 cm mark
3. C
   zero mark
4. D
   10 cm mark

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1. A
   a straight line through the origin: B increases linearly (in direct proportion) with r
2. B
   an upward-curving line: B increases more and more steeply as r increases
3. C
   a concave decreasing curve: B starts high and falls towards zero as r increases
4. D
   a rectangular hyperbola: B falls steeply at first then levels off, i.e. B is inversely proportional to r

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