Area of Circle MCQs 11 min Score: 0 Attempted: 0/11 Subscribe 1. Area of a circle whose radius is “a” cm is: (A) 2πr (B) 2πa (C) πa² (D) 2πa² 2. Circumference of a circle whose radius is 1/2 cm is equal to: (A) 2π (B) 2πr (C) πr/2 (D) r/2 3. Area of a sector of 60° in a circle of radius 6 cm is: (A) 6π (B) 12π (C) 36π (D) 3π 4. The space enclosed between two concentric circles is called: (A) Cone (B) Ellipse (C) Annulus (D) None of these 5. Arc of circle with diameter “d” is: (A) πd (B) 2πd (C) πd/2 (D) None of these 6. If R and r denote the radii of the outer and inner circles, then area of annulus (ring) is: (A) π(R² − r²) (B) 2π(R² − r²) (C) π(R + r)² (D) (R² − r²) 7. If 2a and 2b are the major and minor axis of the ellipse, then area of ellipse is: (A) ab (B) πab (C) (πab)/2 (D) 2πab 8. If 2a and 2b are the major and minor axis of the ellipse, the circumference of the ellipse is: (A) π(a + b) (B) π(a − b) (C) 2π(a + b) (D) 2π(a − b) 9. If the area of a circle is 16π, then radius r is: (A) 4 (B) 2 (C) 16 (D) 8 10. If x and y are the major and minor axis of the ellipse, then area is: (A) (πxy)/2 (B) (πxy)/4 (C) πxy (D) 2πxy 11. The circumference of a pulley is 440/7 cm, its diameter is: (A) 20 cm (B) 40 cm (C) 80 cm (D) 10 cm
