Physics - CSIR NET, GATE & JEST: IFAS

ammeter, voltmeter, scale, slide calipers

Consider a very, very thin wire of uniformly circular cros section. The diameter of the wire is of the order of microns. The correct equipment required to measure the precise value of resistivity of this wire is

Anonymous Poll

32%

ammeter, magnet, screw gauge, thermometer

voltmeter, magnet, screw gauge, scale

30%

ammeter, voltmeter, scale, monochromatice laser source

37 voters487 views07:43

469 views02:33

464 views02:33

A lead container contains 1 gm of a ^60_27 Co radioactive source. It is known that a ^60_27 Co nucleus emits a β particle of energy 316 KeV followed by two gamma emissions 1173 and 1333 KeV respectively. Which of the following experimental methods would

Anonymous Poll

Measure the change in temperature of the source

22%

Measure the weight of the source now and again after one year

41%

Measure the recoil momentum of the nucleus during β emission

Measure the number of gamma photons emitted by this source

🔥2

32 voters587 views07:33

(a) the particle will shoot out of the well and move out towards infinity in one of the two possible

A charged particle is in the ground state of a one-dimensional harmonic oscillator potential, generated by electrical means. If the power is suddenly switched off, so that the potential disappears, then, according to quantum mechanics,

Anonymous Poll

21%

45%

(b) the particle will stop oscillating and as time increases it may be found farther and farther way

21%

12%

(d) the particle will undergo a transition to one of the higher excited states of the harmonic oscil

42 voters702 views07:34

(a) the crystals are of simple cubic type

Metallic Copper is known to form cubic crystals and the lattice constant is measured from X-ray diffraction studies to be about 0.36 nm. If the specific gravity of Copper is 8.96 and its atomic weight is 63.5, one can conclude that

Anonymous Poll

16%

29%

(b) the crystals are of b.c.c. type

29%

26%

(d) the crystals are a mixture of f.c.c. and b.c.c. types

31 voters630 views07:34

(a) Fizeau’s rotating wheel experiment

Which of the following classic experiments provides unambiguous proof that the Earth is a non-inertial frame of reference with respect to the fixed stars?

Anonymous Poll

18%

28%

(b) Foucault’s pendulum experiment

16%

38%

(d)Michelson-Morley experiment

❤2

68 voters799 views07:30

(a) remains constant throughout

An ideal gas at a temperature T is enclosed in a rigid container whose walls are initially at temperature T1, where T1 < T. The walls are covered on the outside with perfect thermal insulation and the system is allowed to come to equilibrium. The pressure

Anonymous Poll

26%

(b) is lower at the initial state than at the final state.

(d) is the same at the initial and final stages.

13%

39 voters685 views07:30

IFAS RESULTS - 2025.pdf

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🌟 Why IFAS is India’s No. 1 Institute for PSC, MSc & PhD Entrance Examination? 🌟

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607 views06:22

💔 A tragic loss that words cannot express.
The Ahmedabad plane crash reminds us how fragile life is.
Our hearts go out to the victims and their families.
May their souls rest in eternal peace. 🕊️

465 views04:58

𝐀 𝐛𝐢𝐠 𝐜𝐨𝐧𝐠𝐫𝐚𝐭𝐮𝐥𝐚𝐭𝐢𝐨𝐧𝐬 𝐭𝐨 𝐨𝐮𝐫 𝐬𝐭𝐮𝐝𝐞𝐧𝐭 𝐏𝐨𝐨𝐣𝐚 𝐋. 𝐟𝐨𝐫 𝐪𝐮𝐚𝐥𝐢𝐟𝐲𝐢𝐧𝐠 𝐂𝐒𝐈𝐑 𝐍𝐄𝐓 ! 🏆
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575 views06:39

(a) does not contain velocity-dependent terms.

The Hamiltonian of a dynamical system is equal to its total energy, provided that its Lagrangian

Anonymous Poll

16%

(b) is separable in generalized coordinates and velocities.

25%

28%

(d) has no explicit time dependence.

32 voters471 views07:34

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𝐀 𝐛𝐢𝐠 𝐜𝐨𝐧𝐠𝐫𝐚𝐭𝐮𝐥𝐚𝐭𝐢𝐨𝐧𝐬 𝐭𝐨 𝐨𝐮𝐫 𝐬𝐭𝐮𝐝𝐞𝐧𝐭 𝐁𝐡𝐚𝐰𝐧𝐚 𝐒𝐡𝐚𝐫𝐦𝐚 𝐟𝐨𝐫 𝐪𝐮𝐚𝐥𝐢𝐟𝐲𝐢𝐧𝐠 𝐂𝐒𝐈𝐑 𝐍𝐄𝐓 ! 🏆
Your hard work and our expert guidance made this success possible. 🔥
🌟𝟒𝟎𝟎𝟎+ 𝐈𝐅𝐀𝐒 𝐬𝐭𝐮𝐝𝐞𝐧𝐭𝐬 qualified in CSIR NET Dec 2024!
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447 views06:29

A particle is confined inside a one-dimensional box of length l and left undisturbed for a long time. In the most general case, its wave-function MUST be

Anonymous Poll

(a) the ground state of energy

35%

(b) periodic, where l equals an integer number of periods

27%

(d) any one of the energy eigenfunctions

26 voters419 views07:32

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491 views08:33

𝐀 𝐛𝐢𝐠 𝐜𝐨𝐧𝐠𝐫𝐚𝐭𝐮𝐥𝐚𝐭𝐢𝐨𝐧𝐬 𝐭𝐨 𝐨𝐮𝐫 𝐬𝐭𝐮𝐝𝐞𝐧𝐭 𝐀𝐧𝐬𝐡𝐮𝐥 𝐏. 𝐟𝐨𝐫 𝐪𝐮𝐚𝐥𝐢𝐟𝐲𝐢𝐧𝐠 𝐂𝐒𝐈𝐑 𝐍𝐄𝐓 ! 🏆
Your hard work and our expert guidance made this success possible. 🔥
🌟𝟒𝟎𝟎𝟎+ 𝐈𝐅𝐀𝐒 𝐬𝐭𝐮𝐝𝐞𝐧𝐭𝐬 qualified in CSIR NET Dec 2024!
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475 views06:34

(d) dielectric medium between the core and the outer mesh

The characteristic impedance of a co-axial cable is independent of the

Anonymous Poll

16 voters401 views07:30