12th Physics Slow Learners Study Material. We covered all the 12th Physics Slow Learners Study Material in this post for free so that you can practice well for the exam.
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12th Physics Quiz for Students
A uniform plane sheet of metal in the form of a right-angled triangle ABC has BC>AB>AC and its moment of inertia will be smallest :
(A) About AC as axis
(B) About AB as axis
(C) About BC as axis
(D) With a line through C normal to its plane
Option c – About BC as axis
Particles each of mass 1 kg are placed at 1 m, 2 m, and 4 m on X-axis with respect to the origin. The moment of inertia of the system about Y- the axis is :
(A) 7 kg m²
(B) 14 kg m²
(C) 21 kg m²
(D) 28 kg m²
Option c – 21 kg m²
A disc rotates horizontally at the rate of 100 rpm, and the moment of inertia of the disc about an axis of rotation is 1 kg m². A lump of molten wax weighing 50 g drops gently at a distance of 20 cm, from the axis of rotation and remains stuck to it. Then increase in the moment of inertia of the system is :
(A) 0.2%
(B) 2%
(C) 0.02%
(D) 20%
Option a – 0.2%
The root means a square distance of five identical masses of mass 1 g each and distributed along the OX axis from O is 6 cm. The total moment of inertia about the OY axis :
(A) 90 g cm²
(B) 80 g cm²
(C) 180 g cm²
(D) 36 g cm²
Option c – 180 g cm²
Three masses, each of mass 2 kg are placed at the corners of an equilateral triangle of side 2 m. What is the moment of inertia of this system about an axis along one side of a triangle?
(A) 2 kg m²
(B) 6 kg m²
(C) 4 kg m²
(D) 8 kg m²
Option b – 6 kg m²
With the increase in temperature, a moment of inertia of a solid metal sphere about the diameter :
(A) Decreases
(B) Increases
(C) Does not change
(D) Cannot be predicted
Option b – Increases
The imaginary line passing through the common centers of all particles moving in different circles of a body is :
(A) Equatorial line
(B) Axial line
(C) Axis of rotation
(D) All of these
Option c – Axis of rotation
The M.I. of a body depends upon
(A) Mass, the position of the axis of rotation, and distribution of mass
(B) Weight
(C) Pressure
(D) Amplitude of vibration of particles
An iron disc is melted and recast in the form of a solid sphere then its MI :
(A) Remains the same
(B) Increases
(C) Decreases
(D) May increase are decrease depending on the tempo
Option c – Decreases
If I₁ and I₂ are a moment of inertia of two bodies of identical geometrical shapes the first is of aluminum and the second is of iron then :
(A) I₁ < I₂
(B) I₁ > I₂
(C) I₁ = I₂
(D) I₁ ≥ I₂
Option a – I₁
Two circular discs A and B have equal masses and uniform thickness but have densities d1 and d₂ such that d₁>d₂.Their moments of inertia are:
(A) I₁ > I₂
(B) I₁ >> I₂
(C) I₁ < I₂
(D) I₁ = I₂
Option c – I₁
Four massless rods constitute a square of side 5 cm. At every vertex a weight of 10 g is placed which is of point size. What is the M.I. of the system about an axis passing through one of the vertices and perpendicular to the plane of paper?
(A) 2000 g cm²
(B) 1000 g cm²
(C) 500 g cm²
(D) 1500 g cm²
Option b – 1000 g cm²
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