Equation of a Straight Line Questions and Answers

Q 1.A straight line through P(1, 2) is such that its intercept between the axes is bisected at P. Its equation is
A. x – y + 1 = 0
B. x + y – 3 = 0
C. 2x + y – 4 = 0
D.  x + 2y = 5

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Answer:-C. 2x + y – 4 = 0

Q 2. The equations to a pair of opposite sides of a parallelogram are x² – 5x + 6 = 0 and
y² – 6y + 5 = 0. The equations to its diagonals are
A. 4x + y = 13 and y = 4x – 7
B. 4x + y = 13 and 4y = x – 7
C. x + 4y = 13 and y = 4x – 7
D. y – 4x = 13 and y + 4x = 7

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Answer:-A. 4x + y = 13 and y = 4x – 7

Q 3. If P = (1, 0), Q = (-1, 0), R = (2, 0) are 3 given points, then the locus of the point S satisfying the relation SQ² + SR² = 2SP² is
A. a straight line parallel to the x-axis
B. circle through the origin
C. circle with centre at theorigin
D. a straight line parallel to the y-axis.

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Answer:-D. a straight line parallel to the y-axis.

Q 4. The points A(–4, –1), B(–2, –4), C(4, 0) and D(2, 3) are the vertices of  a
A. square
B. rhombus
C. rectangle 
D. none of these

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Answer:-C. rectangle 

Q 5. The area enclosed by |x| + |y| = 1 is
A. 1
B. 2
C. 3
D. 4

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Answer:-Q 5. The area enclosed by |x| + |y| = 1 is A. 1 B. 2 C. 3 D. 4 Hide Answer

Q 6. If the lines  ax + by + c = 0;, bx + cy + a = 0 and cx + ay + b = 0 be concurrent, then
A. a³ + b³ + c³ + 3abc = 0
B. a³ + b³ + c³ – 3abc = 0
C.   a³ + b³ + c³ – abc = 0
D. None of these

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Answer:-B. a3 + b3 + c3 – 3abc = 0

Q 7. If (–6, -4) and (3, 5) are the extremities of the diagonals of a parallelogram and (-2, 1) is its third vertex, then its fourth vertex is
A. (-1, 0)
B. (0, -1)
C. (-1, 1)
D. none of these

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Answer:-A. (-1, 0)

Q 8. The straight line passing through the point of intersection of the straight lines x – 3y+1 = 0 and 2x +5y – 9 = 0 and having infinite slope and at a distance 2 units from the origin has the equation
A. x = 2
B. 3x + y – 1 = 0
C. y = 1
D. None of these

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Answer:-A. x = 2

Q 9. In the equation y – y₁ = m(x – x₁) if m and x₁ are fixed and different lines are drawn for different values of y₁, then
A. The lines will pass through a single point
B. There will be one line only
C. There will be a set of parallel lines
D. None of these

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Answer:-C. There will be a set of parallel lines

Q 10. Which of the following lines is concurrent with the lines 3x + 4y + 6 = 0and 6x + 5y + 9 = 0
A. 2x + 3y + 5 = 0
B. 3x + 3y + 5 = 0
C. 7x + 9y + 3 = 0
D. None of these

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Answer:-B. 3x + 3y + 5 = 0

Q 11.  If x₁, x₂, x₃ as well as y₁, y_­2, y₃­ are in G.P. with the same common ratio, then the points (x₁, y₁), (x₂, y₂) and (x₃, y₃)
A. Lie on an ellipse
B. Lie on a straight line
C. Lie on a circle
D. Are vertices of a triangle

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Answer:-B. Lie on a straight line

Q 12. The coordinates of the middle points of the sides of a triangle are (3, 2) (4, 3) and (2, 2). Then the coordinates of its centroid are
A. (3, 7/3)
B. (3, 3)
C. (4, 3)
D. none of these

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Answer:-A. (3, 7/3)

Q 13. The points A(2a, 4a), B(2a, 6a), C(2a + Ö3 a, 5a), a > 0 are the vertices of
A. a right angled triangle
B. an equilateral triangle
C. an isosceles triangle
D. none of these

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Answer:-B. an equilateral triangle

Q 14. The value of k for which the lines 7x – 8y + 5 = 0, 3x – 4y + 5 = 0 and 4x + 5y + 5 = 0 are concurrent is given by
A. – 45
B. 44
C. 54
D. – 54

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Answer:-A. – 45

Q 15. The medians AD and BE of a triangle ABC with vertices A(0, b) B(0, 0) and C(a, 0) are perpendicular to each other if
A. b = Ö2a
B. a = Ö2b
C. b = –Ö2a
D. none of these

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Answer:-B. a = Ö2b

Q 16. Consider the equation y – y₁ = m(x – x₁). If m and x₁ are fixed and different lines are drawn for different values of y₁, then
A. the line will pass through a fixed point
B. there will be a set of parallel lines
C. all the lines will be parallel to the line y = y₁
D. none of these

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Answer:-B. there will be a set of parallel lines

Q 17. For what value of ‘a’ the lines x = 3, y = 4 and 4x – 3y + a = 0 are concurrent
A. 0
B. –1
C. 2
D. 3

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Answer:-A. 0

Q 18. The nearest point on the line 3x + 4y = 25 from the origin is
A. (-4, 5)
B. (3, -4)
C. (3, 4)
D. (3, 5)

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Answer:-C. (3, 4)

Q 19. The intercept of a line between the coordinate axes is divided by point (– 5, 4) in the ratio 1 : 2. The equation of the line will be
A. 5x – 8y + 60 = 0
B. 2x – 5y + 30 =
C. 0 8x – 5y + 60 = 0
D. None of these

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Answer:-C. 0 8x – 5y + 60 = 0

Q 20. The lines 15x – 18y + 1 = 0, 12x + 10y – 3 = 0 and 6x + 66y – 11 = 0 are
A. Parallel
B. Perpendicular
C. Concurrent
D. None of these

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Answer:-C. Concurrent

Q 21. A straight line moves so that the sum of the reciprocals of its intercepts on the co-ordinate axes is unity. Then
A. the straight line always passes through fixed point (1, 1)
B. it does not pass through any fixed point
C. it passes through the origin
D. none of these

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Answer:-A. the straight line always passes through fixed point (1, 1)

Q 22. The point of intersection of the lines x/a + y/b = 1 and x/b + y/a = 1 lies on the line
A. x – y = 0
B. (x – y) (a + b) = 2ab
C. (lx + my) (a – b) = (l + m)ab
D. (lx – my) (a – b) = (1 – m)ab

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Answer:-A. x – y = 0

Q 23. The three lines 4x – 7y + 10 = 0, x + y = 5 and 7x + 4y = 15 form the sides of a triangle. Then the point (1, 2) is its
A. centroid
B. incentre
C. orthocenter
D. none of these

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Answer:-C. orthocenter

Q 24. The straight lines x + 2y – 9 = 0, 3x + 5y – 5 = 0 and ax + by – 1 = 0 are concurrent, if the straight line 35x – 22y + 1 = 0 passes through the point
A.   (a, b)
B. (b, a)
C. (–a, –b)
D. None of these

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Answer:-A.   (a, b)

Q 25. Points on the line x + y = 4 that lie at a unit distance from the line 4x + 3y – 10 = 0 are
A. (3, 1) and (-7, 11)
B. (-3, 7) and (2, 2)
C. (-3, 7) and (-7, 11)
D. none of these

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Answer:-A. (3, 1) and (-7, 11)

Q 26. In a rhombus ABCD, the diagonals AC and BD intersect at the point (1, 2). If the point B is (2, 3), the diagonal AC has equation
A. x + y = 0
B. x – y = 3
C. x – y = 0
D. x + y = 3

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Answer:-D. x + y = 3

Q 27. The solution of equations x + y = 10, 2x + y = 18 and 4x – 3y = 26 will be
A. Only one solution
B. No Solution
C. Infinite solution
D. None of these

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Answer:-A. Only one solution

Q 28. The straight line passing through the point of intersection of the straight lines x – 3y + 1 = 0 and 2x + 5y – 9 = 0 and having infinite slope and at a distance of 2 units from the origin, has the equation
A. x = 2
B. 3x + y – 1 = 0
C. y = 1
D. None of these

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Answer:-A. x = 2

Q 29. The number of values of c such that the straight line y = 4x + c touches the curve x²/4 + y² = 1 is
A. 0
B. 1
C. 2
D. Infinite

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Answer:-C. 2

Q 30. The equations of the lines through (-1, -1) and making angle 45° with the line x + y = 0 are given by
A. x + 1 = 0, x – y = 0
B. y + 1 = 0, x – y = 0
C. x + 1 = 0, y + 1= 0
D. none of these

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Answer:-C. x + 1 = 0, y + 1= 0

Q 31. Let the vertices of a triangle be (0, 0), (3, 0) and (0, 4). Its orthocentre is
A. (0, 0)
B. (1, 4/3)
C. (3/2, 2)
D. none of these

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Answer:-A. (0, 0)

Q 32. For the straight lines given by the equation (2 + k)x + (1 + k)y = 5 + 7k, for different values of k which of the following statements is true
A. Lines are parallel
B. Lines pass through the point (– 2, 9)
C. Lines pass through the point (2, – 9)
D. None of these

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Answer:-B. Lines pass through the point (– 2, 9)

Q 33. If the pair of straight lines xy – x – y + 1 = 0 and the line ax + 2y – 3 = 0 are concurrent, then a =
A.  0
B. – 1
C. 1
D. 3

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Answer:-C. 1

Q 34. The points (-a, -b), (0, 0), (a, b) and (a², ab) are
A. collinear
B. vertices of a parallelogram
C. vertices of a rectangle
D. none of these

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Answer:-A. collinear