MCQOPTIONS
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MCQOPTIONS
This section includes 8 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The moment of inertia of a planar square about a planar axis parallel to one side is 10kgm2. What is the moment of inertia about a diagonal? |
| A. | 10kgm2 |
| B. | 5kgm2 |
| C. | 20kgm2 |
| D. | 1kgm2 |
| Answer» B. 5kgm2 | |
| 2. |
The moment of inertia of a ring about a tangent is 4kgm2. What is the moment of inertia about an axis passing through the centre of the ring and perpendicular to its plane? Mass of the ring is 2kg & diameter is 2m. |
| A. | 2kgm2 |
| B. | 4kgm2 |
| C. | 8kgm2 |
| D. | 1kgm2 |
| Answer» C. 8kgm2 | |
| 3. |
What is the moment of inertia of a rod, of mass 1kg & length 6m, about an axis perpendicular to rod’s length and at a distance of 1.5m from one end? |
| A. | 0.75kgm2 |
| B. | 3kgm2 |
| C. | 5.25kgm2 |
| D. | 14.25kgm2 |
| Answer» D. 14.25kgm2 | |
| 4. |
Let I1 be the moment of inertia about the centre of mass of a thick asymmetrical body. Let I2 be the moment of inertia about an axis parallel to I1. The distance between the two axes is ‘a’ & the mass of the body is ‘m’. Find the relation between I1 & I2. |
| A. | I2 = I1 – ma2 |
| B. | I1 = I2 – ma2 |
| C. | I2 = I1 |
| D. | Parallel axis theorem can’t be used for a thick asymmetrical body |
| Answer» C. I2 = I1 | |
| 5. |
The moment of inertia of a planar disc about a diameter is 8kgm2. What is the moment of inertia about an axis passing through its centre and perpendicular to the plane of disc? |
| A. | 8kgm2 |
| B. | 16kgm2 |
| C. | 4kgm2 |
| D. | 2√2kgm2 |
| Answer» C. 4kgm2 | |
| 6. |
Consider two perpendicular axis in the plane of a planar body, such that I1 = 2 I2. The moment of inertia about an axis perpendicular to the plane and passing through intersection of I1 & I2 is 9kgm2. Find the value of I1& I2. |
| A. | I1 = 9kg m2, I2 = 4.5kgm2 |
| B. | I1 = 3kg m2, I2 = 6kg m2 |
| C. | I1 = 6kg m2, I2 = 3kg m2 |
| D. | I1 = 18kg m2, I2 = 9kg m2 |
| Answer» D. I1 = 18kg m2, I2 = 9kg m2 | |
| 7. |
Perpendicular axis theorem can be applied for which of the following bodies? |
| A. | Ring having radius R & negligible cross section |
| B. | Disc of radius R and thickness t |
| C. | Cylinder of radius R and height h |
| D. | A cube of side ‘a’ |
| Answer» B. Disc of radius R and thickness t | |
| 8. |
A planar body is lying in the xz plane. What is the relation between its moment of inertia along the x, y & z axes? |
| A. | Iz = Ix + Iy |
| B. | Ix = Ix + Iz |
| C. | Iy = Ix + Iz |
| D. | Iz = Ix = Iy, because body is planar |
| Answer» D. Iz = Ix = Iy, because body is planar | |