1
IIT-JEE 2007 Paper 1 Offline
MCQ (Single Correct Answer)
+3
-1

Consider the circle $${x^2} + {y^2} = 9$$ and the parabola $${y^2} = 8x$$. They intersect at P and Q in the first and the fourth quadrants, respectively. Tangents to the circle at P and Q intersect the x-axis at R and tangents to the parabola at P and Q intersect the x-axis at S.

The radius of the incircle of the triangle PQR is

A
4 units
B
3 units
C
$$\frac{8}{3}$$ units
D
2 units
2
IIT-JEE 2007 Paper 1 Offline
MCQ (Single Correct Answer)
+3
-1

Consider the following linear equations

$$ax + by + cz = 0$$

$$bx + cy + az = 0$$

$$cx + ay + bz = 0$$

Match the conditions/expressions in Column I with statements in Column II.

Column I Column II
(A) $$a + b + c \ne 0$$ and $${a^2} + {b^2} + {c^2} = ab + bc + ca$$ (P) the equations represent planes meeting only at a single point.
(B) $$a + b + c = 0$$ and $${a^2} + {b^2} + {c^2} \ne ab + bc + ca$$ (Q) the equations represent the line $$x=y=z$$.
(C) $$a + b + c \ne 0$$ and $${a^2} + {b^2} + {c^2} \ne ab + bc + ca$$ (R) the equations represent identical planes.
(D) $$a + b + c = 0$$ and $${a^2} + {b^2} + {c^2} = ab + bc + ca$$ (S) the equations represent the whole of the three dimensional space.

A
A - (q), B - (r), C - (p), D - (s)
B
A - (r), B - (q), C - (s), D - (p)
C
A - (r), B - (p), C - (q), D - (s)
D
A - (r), B - (q), C - (p), D - (s)
3
IIT-JEE 2007 Paper 1 Offline
MCQ (Single Correct Answer)
+3
-1

In the following [x] denotes the greatest integer less than or equal to x.

Match the functions in Column I with the properties Column II.

Column I Column II
(A) $$x|x|$$ (P) continuous in ($$-1,1$$).
(B) $$\sqrt{|x|}$$ (Q) differentiable in ($$-1,1$$)
(C) $$x+[x]$$ (R) strictly increasing in ($$-1,1$$)
(D) $$|x-1|+|x+1|$$ (S) not differentiable at least at one point in ($$-1,1$$)

A
A - (p), (q), (r), B - (p), (s), C - (r), (s), D - (p), (q)
B
A - (p), (q), B - (p), (s), C - (r), (s), D - (p)
C
A - (p), (q), (r), B - (p), C - (r), D - (p), (q)
D
A - (p), (r), B - (p), (s), C - (r), D - (p), (q)
4
IIT-JEE 2007 Paper 1 Offline
MCQ (Single Correct Answer)
+3
-1

Match the integrals in Column I with the values in Column II.

Column I Column II
(A) $$\int\limits_{ - 1}^1 {{{dx} \over {1 + {x^2}}}} $$ (P) $${1 \over 2}\log \left( {{2 \over 3}} \right)$$
(B) $$\int\limits_0^1 {{{dx} \over {\sqrt {1 + {x^2}} }}} $$ (Q) $$2\log \left( {{2 \over 3}} \right)$$
(C) $$\int\limits_2^3 {{{dx} \over {1 + {x^2}}}} $$ (R) $${\pi \over 3}$$
(D) $$\int\limits_1^2 {{{dx} \over {x\sqrt {{x^2} - 1} }}} $$ (S) $${\pi \over 2}$$

A
A - s, B - s, C - r, D - p
B
A - s, B - q, C - p, D - r
C
A - s, B - s, C - p, D - r
D
A - s, B - q, C - s, D - r

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