MEDIUM
11th West Bengal Board
IMPORTANT
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A rectangular bar is subjected to two equal and opposite forces F as shown in Figure. AB is a plane making an angle θ with the cross-section of the bar. If the area of cross-section of the bar is a, then the tensile stress on AB is

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Important Questions on Elasticity

MEDIUM
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 12 - Elasticity>EXERCISE>Q 33
In the above problem, the shearing stress on AB is.
MEDIUM
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 12 - Elasticity>EXERCISE>Q 34
A rectangular bar is subjected to two equal and opposite forces F as shown in Figure. AB is a plane making an angle θ with the cross-section of the bar. If the area of cross-section of the bar is a, then the tensile stress on AB is maximum when

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MEDIUM
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 12 - Elasticity>EXERCISE>Q 35
In the above problem, the shearing stress is maximum when,
MEDIUM
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 12 - Elasticity>EXERCISE>Q 36
Write copper, steel, glass and rubber in order of increasing coefficient of elasticity
MEDIUM
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 12 - Elasticity>EXERCISE>Q 37
Bulk modulus of an incompressible liquid is
MEDIUM
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 12 - Elasticity>EXERCISE>Q 38
The load versus elongation graph for four wires of the same material is shown in Fig. The thinnest wire is represented by the line.

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MEDIUM
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 12 - Elasticity>EXERCISE>Q 39

Assertion (A): Ductile metals are used to prepare thin wires.

Reason (R) : Jn the stress-strain curve of ductile metals, the length between the points representing elastic limit and breaking point is very small.

HARD
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 12 - Elasticity>EXERCISE>Q 40
A wire of initial length L and radius r is stretched by a length l. Another wire of the same material but with initial length 2L and radius 2r is stretched by a length 2l. The ratio of the stored energy per unit volume in the first and second wire is