1. A
   $ab=cd$
2. B
   $ac=bd$
3. C
   $ad=bc$
4. D
   $abc=d$

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1. A
   8
2. B
   10
3. C
   12
4. D
   14

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1. A
   3
2. B
   4
3. C
   5
4. D
   6

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1. A
   $105°$
2. B
   $120°$
3. C
   $135°$
4. D
   $150°$

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1. A
   4 square units
2. B
   9 square units
3. C
   16 square units
4. D
   25 square units

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

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1. A
   6 units
2. B
   5 units
3. C
   3 units
4. D
   2 units

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1. A
   $(a+b+c)^2$
2. B
   $2(a+b+c)$
3. C
   3
4. D
   1

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1. A
   2
2. B
   4
3. C
   8
4. D
   16

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1. A
   $x+y=5$
2. B
   $z=5$
3. C
   $z=0$
4. D
   $x+y+z=5$

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1. A
   $\frac{\sqrt{3}\,\hat{i}+\hat{j}}{2}$
2. B
   $\frac{\sqrt{3}\,\hat{i}-\hat{j}}{2}$
3. C
   $\frac{\hat{i}+\sqrt{3}\,\hat{j}}{2}$
4. D
   $\frac{\hat{i}-\sqrt{3}\,\hat{j}}{2}$

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1. A
   $6\hat{i}+6\hat{j}\pm\sqrt{2}\,\hat{k}$
2. B
   $6\hat{i}+6\sqrt{2}\,\hat{j}\pm6\hat{k}$
3. C
   $6\sqrt{2}\,\hat{i}+6\hat{j}\pm6\hat{k}$
4. D
   $3\sqrt{2}\,\hat{i}+3\hat{j}\pm6\hat{k}$

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1. A
   21
2. B
   25
3. C
   31
4. D
   36

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

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1. A
   1
2. B
   $-1$
3. C
   5
4. D
   $-5$

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

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1. A
   4·4 cm/sec
2. B
   8·4 cm/sec
3. C
   8·8 cm/sec
4. D
   15·4 cm/sec

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1. A
   $\frac{2}{3}$
2. B
   $\frac{4}{3}$
3. C
   $\frac{8}{3}$
4. D
   4

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

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1. A
   $-1$
2. B
   Zero
3. C
   $-e$
4. D
   $-\frac{1}{e}$

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1. A
   $-2<p<0$
2. B
   $-2<p<2$
3. C
   $0<p<2$
4. D
   $3<p<5$

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1. A
   $\theta\,d\varphi$
2. B
   $-\theta\,d\varphi$
3. C
   $4\theta\,d\varphi$
4. D
   $-4\theta\,d\varphi$

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1. A
   $\frac{p(x)}{1+2\ln 2}+c$
2. B
   $\frac{p(x)}{2(1+2\ln 2)}+c$
3. C
   $\frac{2p(x)}{1+\ln 4}+c$
4. D
   $\frac{p(x)}{1+\ln 2}+c$

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

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1. A
   4·71
2. B
   5·23
3. C
   6·03
4. D
   8·01

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