Properties of Solids & Liquids-Young's Modulus [NEST (National Entrance Screening Test-NISER) Physics]: Questions 1 - 3 of 3

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Question 1

Appeared in Year: 2015

Question MCQ▾

A horizontal steel railroad track has a length of 100 m when the temperature is 250 C. The track is constrained from expanding or bending. The stress on the track on a hot summer day, when the temperature is 400 C, is –

(Note: the linear coefficient of thermal expansion for steel is and the Young՚s modulus of steel is )

Choices

Choice (4)Response

a.

b.

c.

d.

Edit

Question 2

Appeared in Year: 2016

Question MCQ▾

A monochromatic light source of wavelength is placed slightly above a plane mirror as shown. Image of in can be used as a virtual source to produce interference fringes on the screen. The distance of source from is , and the distance of screen from is (figure is not to scale) . If the angle radians, the width of the interference fringes observed on the screen is –

An Experimental Setup with Monochromatic Light

Choices

Choice (4)Response

a.

b.

c.

d.

Edit

Question 3

Appeared in Year: 2015

Question MCQ▾

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

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

Edit