NEST (National Entrance Screening Test) Physics: Questions 43 - 45 of 58

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Question number: 43

» Dual Nature of Matter and Radiation » De-Broglie Relation

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Appeared in Year: 2014

MCQ▾

Question

A free particle with initial kinetic energy and de Broglie wavelength enters a region of constant potential energy such that the new de Broglie wavelength is now . Then is –

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 44

» Wave Optics » Young's Double Slit Experiment

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Appeared in Year: 2014

MCQ▾

Question

In a Young’s double slit experiment fringes are observed in a given segment of the screen when light of wavelength is used. When the experiment is performed in a medium of refractive index , the number of fringes observed in the same segment remains . The wavelength of light used in this case is –

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 45

» Properties of Solids & Liquids » Young's Modulus

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Appeared in Year: 2015

MCQ▾

Question

The stress – strain plot for wires made of two materials ( and ) is presented schematically in the accompanying figure. The points and represent fracture points of the two materials and respectively. It can be concluded from these graphs that –

Graph of Stress vs Strain

Graph of Stress vs Strain

In figure graph of stress vs strain of two different materials is shown

Choices

Choice (4) Response

a.

Material and are equally brittle

b.

The linear region of material extends to a larger value of stress that of material .

c.

Material is more ductile than material

d.

Material has Young’s modulus larger than that of material