Which of the following is not a measure of dispersion?

**A. ** Range

**B. ** Standard deviation

**C. ** Arithmetic mean

**D. ** Variance

**Answer : ****Option C**

**Explaination / Solution: **

No Explaination.

No Explaination.

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A page is selected at random from a book. The probability that the digit at units place of the page number chosen is less than 7 is

**A. ** 3/10

**B. ** 7/10

**C. ** 3/9

**D. ** 7/9

**Answer : ****Option B**

**Explaination / Solution: **

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In a hollow cylinder, the sum of the external and internal radii is 14 cm and the width is 4 cm. If its height is 20 cm, the volume of the material in it is

**A. ** 5600*π* cm^{3}

**B. ** 11200*π* cm^{3}

**C. ** 56*π* cm^{3}

**D. ** 3600*π* cm^{3}

**Answer : ****Option B**

**Explaination / Solution: **

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The value of sin^{2}θ
+ is equal to

**A. ** tan^{2} θ

**B. ** 1

**C. ** cot^{2} θ

**D. ** 0

**Answer : ****Option B**

**Explaination / Solution: **

No Explaination.

No Explaination.

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The electric pole subtends an angle of 30° at a point on the same level as its foot. At a second point ‘b’ metres above the first, the depression of the foot of the tower is 60° . The height of the tower (in metres) is equal to

**A. ** √3b

**B. ** b/3

**C. ** b/2

**D. ** b/√3

**Answer : ****Option B**

**Explaination / Solution: **

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The slope of the line
joining (12, 3) , (4,*a*) is 1/8. The value of ‘*a*’ is

**A. ** 1

**B. ** 4

**C. ** -5

**D. ** 2

**Answer : ****Option D**

**Explaination / Solution: **

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If in triangles *ABC*
and *EDF*, then they will be similar, when

**A. ** ∠B = ∠E

**B. ** ∠A = ∠D

**C. ** ∠B = ∠D

**D. ** ∠A = ∠F

**Answer : ****Option C**

**Explaination / Solution: **

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A tangent is perpendicular to the radius at the

**A. ** Centre

**B. ** point of contact

**C. ** infinity

**D. ** chord

**Answer : ****Option B**

**Explaination / Solution: **

No Explaination.

No Explaination.

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gives

**A. **

**B. **

**C. **

**D. **

**Answer : ****Option C**

**Explaination / Solution: **

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If number of columns and rows are not equal in a matrix then it is said to be a

**A. ** diagonal matrix

**B. ** rectangular matrix

**C. ** square matrix

**D. ** identity matrix

**Answer : ****Option B**

**Explaination / Solution: **

No Explaination.

No Explaination.

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