Circle MCQ Quiz in मल्याळम - Objective Question with Answer for Circle - സൗജന്യ PDF ഡൗൺലോഡ് ചെയ്യുക
Last updated on Mar 9, 2025
Latest Circle MCQ Objective Questions
Top Circle MCQ Objective Questions
Circle Question 1:
Angle subtended by the largest chord of the circle to a point on the same circle measures:
Answer (Detailed Solution Below)
Circle Question 1 Detailed Solution
Given:
The angle subtended by a chord at the centre = 180°
Concept Used:
The angle subtended by a chord at the centre is twice the angle subtended on the circumference.
Calculation:
⇒ Angle subtended on the circumference = 180° / 2 = 90°
Therefore, the angle subtended by the same chord on the circumference is 90°.
Circle Question 2:
Find the number of common tangents, if r1 + r2 = C1C2. (With usual notations, r1 & r2 and C1 & C2 are the radii and centres of the two circles.)
Answer (Detailed Solution Below)
Circle Question 2 Detailed Solution
Calculation:
As the expression given is C1C2 = r1 + r2
C1C2 represents the distance between the centers of the circles.
r1 represents the radius of the first circle
r2 represents the radius of the second circle.
C1C2 = r1 + r2 represents that the distance between the centers of the circle is equal to the sum of the radius, which means the circle touches each other externally.
When the circle touches each other externally then there are only three tangents are possible.
i.e. two direct common tangents and one transverse tangent.
∴ The correct answer is Option 3.
Circle Question 3:
DE is a chord and KDE is a secant of a circle. If KD = 9 cm, DE = 7 cm and KH is a tangent to the circle at point H, then find KH.
Answer (Detailed Solution Below)
Circle Question 3 Detailed Solution
Given:
DE is the chord of a circle.
KD = 9 cm ; DE = 7 cm
Concept used:
If a tangent and a secant are drawn from a common point outside the circle then,
Tengent2 = line of secant × (line of sacant - chord)
Calculation:
From tangent and secant relation:
⇒ KH2 = KD × KE
⇒ KH2 = 9 × 16
⇒ KH = √144 = 12 cm
∴ The correct answer is 12 cm.
Circle Question 4:
Two equal circles of radius 18 cm intersect each other, such that each passes through the centre of the other. The length of the common chord is _________.
Answer (Detailed Solution Below)
Circle Question 4 Detailed Solution
Given:
The radius of the circles is 18 cm
Calculation:
According to the diagram,
AD = DB
O1O2 = 18
Again O1A = O2A = 18 [Radius of the circle]
∠ADO1 = 90°
O1D = O2D = 9
AD = √(324 - 81)
⇒ (9√3)
AB = 2 × (9√3) = 18√3 = 6√27
∴ The length of the common chord is 6√27 cm.
Circle Question 5:
O is the centre of this circle. Tangent drawn from a point P, touches the circle at Q. If PQ = 24 cm and OQ = 10 cm, then what is the value of OP?
Answer (Detailed Solution Below)
Circle Question 5 Detailed Solution
Given:
O is the centre of this circle. Tangent drawn from a point P, touches the circle at Q.
PQ = 24 cm and OQ = 10 cm
Concept used:
1. If a tangent is drawn on a circle from an external point, then at the point of tangency, it is perpendicular to the radius.
2. In a right-angled triangle, Hypotenuse2 = Base2 + Height2
Calculation:
According to the concept,
∠OQP = 90°
Hence, OP is the hypotenuse of ΔOQP which is a right-angled triangle.
Now, OP = \(\sqrt {24^2 + 10^2}\) = 26 cm
∴ The value of OP is 26 cm.
Circle Question 6:
Let O be the centre of the circle and AB and CD are two parallel chords on the same side of the radius. OP is perpendicular to AB and OQ is perpendicular to CD. If AB = 10 cm, CD = 24 cm and PQ = 7 cm, then the diameter (in cm) of the circle is equal to:
Answer (Detailed Solution Below)
Circle Question 6 Detailed Solution
Given:
AB = 10 cm
CD = 24 cm
PQ = 7 cm
Formula used:
Pythagorean formula :
H2 = P2 + B2
H = Hypotaneous, P = perpendicular, B = base
Calculations:
In Δ COQ,
CO2 = CQ2 + OQ2
⇒ r2 = 122 + OQ2
⇒ r2 = 144 + OQ2 ---(1)
In Δ AOP,
OP = OQ + PQ = OQ + 7
AO2 = AP2 + OP2
⇒ r2 = 52 + (7 + OQ)2
⇒ r2 = 25 + (49 + OQ2 + 14OQ) ---(2)
From equation (1) and (2):
144 + OQ2 = 25 + (49 + OQ2 + 14OQ)
⇒ 144 + OQ2 = 25 + 49 + OQ2 + 14OQ
⇒ 144 = 74 + 14OQ
⇒ 144 - 74 = 14OQ
⇒ 70 = 14 OQ
⇒ OQ = 70/14 = 5 cm
So, from equation (1),
⇒ r2 = 144 + OQ2 = 144 + 52 = 144 + 25 = 169
⇒ r = √169 = 13 cm
Hence, diameter of the circle = 2r = 2 × 13 = 26 cm
∴ The correct answer is option (1).
Circle Question 7:
In the following figure, O is the centre of the circle. Its two chords AB and CD intersect each other at point P inside the circle. If AB = 18 cm, PB = 6 cm and CP = 4 cm, then find the measure of PD.
Answer (Detailed Solution Below)
Circle Question 7 Detailed Solution
Two chords AB and CD intersect each other at point P.
AB = 18 cm, PB = 6 cm, and CP = 4 cm
Formula used:-
If two chords AB and CD intersect each other at point P inside the circle,
then AP × PB = CP × PD
Calculation:-
AP = AB - PB
⇒ AP = 18 - 6 = 12 cm
According to the formula
AP × PB = CP × PD
⇒ 12 × 6 = 4 × PD
⇒ PD = 72/4
∴ The required answer is 18.
Circle Question 8:
In the figure given below, PQ is the diameter of the circle with centre O. If ∠QOR = 100° then the measure of ∠PSR is:
Answer (Detailed Solution Below)
Circle Question 8 Detailed Solution
Given:
PQ is a diameter.
∠QOR = 100°
Concept used:
the angle subtended by the chord at the centre of the circle is twice
the angle subtended at any point on the circle's circumference.
Calculation:
⇒ ∠QOR + ∠ROP = 180°
⇒ ∠ROP = 180 - 100 = 80°
∠ROP = 2 × ∠PSR
⇒ ∠PSR = 80/2 = 40°
∴ The correct answer is 40°.
Circle Question 9:
A chord of length 42 cm is drawn in a circle having diameter 58 cm. What is the minimum distance of other parallel chord of length 40 cm in the same circle from 42 cm long chord?
Answer (Detailed Solution Below)
Circle Question 9 Detailed Solution
Given:
The diameter of the circle = 58 cm
The length of one chord = 42 cm
The length of another chord = 40 cm
Formula used:
H2 = B2 + P2
Calculation:
AB and PQ are two chords, and O is the center of the circle.
M is the midpoint of AB and N is the midpoint of PQ
OB = OQ = 29 cm [radius of the circle]
AB = 40 cm and OB = 29
Then,
AM = MB = 40/2 = 20 cm
In ΔMOB
(OB)2 = (OM)2 + (MB)2
⇒ (29)2 = (OM)2 + (20)2
⇒ 841 = (OM)2 + 400
⇒ (OM)2 = (841 – 400)
⇒ (OM)2 = 441
⇒ OM = 21 cm
Now,
PQ = 42 cm and OB = 29
NQ = PN = 42/2 = 21 cm
In ΔONQ
(OQ)2 = (ON)2 + (NQ)2
⇒ (29)2 = (ON)2 + (21)2
⇒ 841 = (ON)2 + 441
⇒ (ON)2 = (841 – 441)
⇒ (ON)2 = 400
⇒ ON = 20 cm
So according to the question.
⇒ 21 - 20 = 1
∴ The minimum distance between the two chords is 1 cm.
Circle Question 10:
In the following figure, there are two circles that touch each other externally. The radius of the first circle with centre P is 25 cm. The radius of the second circle with centre Q is 4 cm. Find the length of their direct common tangent AB.
Figure is not to scale and is only for representational purpose
Answer (Detailed Solution Below)
Circle Question 10 Detailed Solution
Given:
Radius of large circle = 25 cm
Radius of small circle = 4 cm
Formula used:
Direct common tangent = 2 × √(R × r)
Calculation:
Direct common tangent (AB) = 2 × √(R × r)
⇒ 2 × √(25 × 4)
⇒ 2 × 10 = 20 cm
∴ The correct answer is 20 cm.