Physics - 2021 Past Year Paper

# Physics - 2021 Past Year Paper | IIT JAM Past Year Papers and Model Test Paper (All Branches) PDF Download

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IIT-JAM 2021
SECTION – A
Multiple Choice Questions (MCQ)

Q1 – Q10 Carry One Mark Each
Q1. The function
cosx
e is Taylor expanded about 0 x ? . The coefficient of
2
x is
(a)
1
2
?  (b)
2
e
?  (c)
2
e
(d) Zero
Ans. : (b)
Q2. Let M be a 22 ? matrix. Its trace is 6 and its determinant has value 8 . Its eigenvalues are
(a) 2 and 4  (b) 3 and 3  (c) 2 and 6  (d) 2 ? and 3 ?
Ans. : (a)
Q3. A planet is in a highly eccentric orbit about a star. The distance of its closest approach is
300 times smaller than its farthest distance from the star. If the corresponding speeds are
c
v and
f
v , then
c
f
v
v
is
(a)
1
300
(b)
1
300
(c) 300  (d) 300
Ans. : (d)
Q4. An object of density ? is floating in a liquid with 75% of its volume submerged. The
density of the liquid is
(a)
4
3
?  (b)
3
2
?  (c)
8
5
?  (d) 2 ?
Ans. : (a)
Q5. An experiment with a Michelson interferometer is performed in vacuum using a laser of
wavelength 610nm . One of the beams of the interferometer passes through a small glass cavity
1.3cm long. After the cavity is completely filled with a medium of refractive index ,472 n dark
fringes are counted to move past a reference line. Given that the speed of light is
8
310 / ms ? , the
value of n is
(a) 1.01  (b) 1.04  (c) 1.06  (d) 1.10
Ans. : (a)
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29 docs|48 tests

## FAQs on Physics - 2021 Past Year Paper - IIT JAM Past Year Papers and Model Test Paper (All Branches)

 1. How does Newton's first law of motion apply to the article's content?
Ans. Newton's first law of motion states that an object at rest will stay at rest, and an object in motion will stay in motion with the same speed and direction unless acted upon by an external force. In the context of the article, this law can be applied to explain the motion of objects mentioned, such as the movement of electrons in a conductor or the motion of a pendulum.
 2. What is the relationship between voltage and current mentioned in the article?
Ans. The relationship between voltage and current is defined by Ohm's law, which states that the current flowing through a conductor is directly proportional to the voltage across the conductor, provided the temperature and other physical conditions remain constant. This relationship is crucial for understanding the behavior of electrical circuits and is relevant to the article's content.
 3. Can you explain the concept of electromagnetic induction mentioned in the article?
Ans. Electromagnetic induction is the process by which a changing magnetic field induces an electric current in a conductor. This phenomenon is described by Faraday's law of electromagnetic induction. In the context of the article, electromagnetic induction is relevant for understanding the generation of electricity through the movement of magnetic fields, such as in generators or transformers.
 4. How does the article relate to the conservation of energy?
Ans. The article relates to the conservation of energy by discussing various phenomena, such as the conversion of electrical energy into other forms, such as light or heat. The conservation of energy principle states that energy cannot be created or destroyed, only transformed from one form to another. Understanding this principle is essential for analyzing the energy transformations described in the article.
 5. Can you explain the concept of wave-particle duality mentioned in the article?
Ans. Wave-particle duality is a fundamental concept in quantum mechanics that suggests that particles, such as electrons or photons, can exhibit both wave-like and particle-like properties. This concept is relevant to the article's content as it discusses the behavior of electrons and photons, which can be described as both particles and waves. The wave-particle duality helps explain certain phenomena, such as the interference and diffraction of light or the wave nature of electrons in quantum mechanics.

## IIT JAM Past Year Papers and Model Test Paper (All Branches)

29 docs|48 tests

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