Physics
2021 · Paper 1
Take it one question at a time. Try an answer, then check your understanding.
Complete GATE PH 2021 Paper 1 overview, original pages and practice · Timed previous-paper practice
Questions 49–51 of 65. Imported answers require review unless explicitly marked reviewed.
Question 39
Open questionPHMCQ2 marksNeeds review
Consider a spherical galaxy of total mass
and radius
, having a uniform matter distribution. In this idealized situation, the orbital speed
of a star of mass
(
) as a function of the distance
from the galactic centre is best described by(
is the universal gravitational constant)Your answerChoose one option.
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Open questionPHMCQ2 marksNeeds review
Consider the potential
defined as
where
and
are real constants of appropriate dimensions. According to the first Born approximation, the elastic scattering amplitude calculated with
for a (wave-vector) momentum transfer
and
, is proportional to(Useful integral:
)Your answerChoose one option.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 41
Open questionPHMCQ2 marksNeeds review
As shown in the figure, inverse magnetic susceptibility
is plotted as a function of temperature
for three different materials in paramagnetic states.
(Curie temperature of ferromagnetic material
Néel temperature of antiferromagnetic material
)Choose the correct statement from the following
Your answerChoose one option.
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