NEET Physics: Questions 1142 - 1147 of 2142

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Question number: 1142

» Thermodynamics » Concept of Temperature

MCQ▾

Question

A given system undergoes a change in which the work done by the system equals the decrease In its internal energy. The system must have undergone an

Choices

Choice (4) Response

a.

Adiabatic change

b.

Isobaric change

c.

Isochoric change

d.

Isothermal change

Question number: 1143

» Properties of Solids & Liquids » Elastic Behavior

MCQ▾

Question

A 4.0 m long copper wire of cross sectional area 1.5 cm 2 is stretched by a force of 4.8 × 10 3 N stress will be -

Choices

Choice (4) Response

a.

4.4 × l0 7 N/m 2

b.

5.0 × l0 7 KN/m 2

c.

3.2 × l0 7 N/m 2

d.

All of the above

Question number: 1144

» Wave Optics » Diffraction Due to a Single Slit Width of Central Maximum

MCQ▾

Question

In Fresnel diffraction, if the distance between the disc and the screen is decreased, the intensity of central bright spot will

Choices

Choice (4) Response

a.

Increase

b.

Remain constant

c.

decrease

d.

All of the above

Question number: 1145

» Properties of Solids & Liquids » Heat Transfer » Conduction

MCQ▾

Question

Four rods of identical cross-sectional area and made from the same metal form the sides of square. The temperature of two diagonally opposite points are T and √2T respectively in the steady state. Assuming that only heat conduction takes place, what will be the temperature difference between other two points

Choices

Choice (4) Response

a.

Equation

b.

0

c.

Equation

d.

All of the above

Passage

Read the passage given below and answer the questions that follow:

A gas of identical hydrogen like atoms has some atoms in ground state and some atoms in a particular excited state and there are no atoms in any other energy level. The atoms of the gas make transition to a higher energy state by absorbing monochromatic light of wavelength 304 Å. Subsequently, the atoms emit radiation of only six different photon energies. Some of emitted photons have wavelength 304 Å, some have wavelength more and some have less than 304 Å (Take h c = 12420 eV- Å)

Question number: 1146 (1 of 3 Based on Passage) Show Passage

» Atoms and Nuclei » Energy Levels

MCQ▾

Question

Identify the gas (Z =? )

Choices

Choice (4) Response

a.

2

b.

1

c.

4

d.

3

Question number: 1147 (2 of 3 Based on Passage) Show Passage

» Atoms and Nuclei » Hydrogen Spectrum

MCQ▾

Question

Find the principal quantum number of the initially excited

Choices

Choice (4) Response

a.

1

b.

3

c.

2

d.

4

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