MCQOPTIONS
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MCQOPTIONS
This section includes 7 Mcqs, each offering curated multiple-choice questions to sharpen your Mathematics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A balloon s radius increases 3 times when the air is pumped in it. If the surface area of the balloon after pumping the air is A2 and its surface area before pumping the air is A1, then what is the value of ( frac{A_1}{A_2} ) ? |
| A. | ( frac{9}{1} ) |
| B. | ( frac{1}{3} ) |
| C. | ( frac{3}{1} ) |
| D. | ( frac{1}{9} ) |
| Answer» E. | |
| 2. |
A hemispheric dome of radius 3.5m is to be painted at a rate of 600/m2. What is the cost of painting it? (Take = ( frac{22}{7} )) |
| A. | 46200 |
| B. | 45000 |
| C. | 47260 |
| D. | 48375 |
| Answer» B. 45000 | |
| 3. |
If surface area of a sphere of radius R is equal to curved surface area of a hemisphere of radius r , what is the ratio of R/r? |
| A. | 1/2 |
| B. | 1/ 2 |
| C. | 2 |
| D. | 2 |
| Answer» C. 2 | |
| 4. |
Total surface area of a hemisphere is 4158cm2, the diameter of the hemisphere is equal to __________ cm. (Take = ( frac{22}{7} )) |
| A. | 40 |
| B. | 20 |
| C. | 21 |
| D. | 42 |
| Answer» E. | |
| 5. |
Total surface are of a hemisphere of radius r is equal to __________ |
| A. | 2 r<sup>2</sup> |
| B. | 4 r<sup>2</sup> |
| C. | 3 r<sup>2</sup> |
| D. | r<sup>2</sup> |
| Answer» D. r<sup>2</sup> | |
| 6. |
Curved surface area of hemisphere of radius r is equal to __________ |
| A. | 2 r<sup>2</sup> |
| B. | 4 r<sup>2</sup> |
| C. | 3 r<sup>2</sup> |
| D. | r<sup>2</sup> |
| Answer» B. 4 r<sup>2</sup> | |
| 7. |
Surface area of a sphere of radius r is given by __________ |
| A. | 2 r<sup>2</sup> |
| B. | 4 r<sup>2</sup> |
| C. | 3 r<sup>2</sup> |
| D. | r<sup>2</sup> |
| Answer» C. 3 r<sup>2</sup> | |