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

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

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