Mechanical Properties of Solids Quiz 1 – Punjab Meritorious School Preparation Portal

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When an elastic material with Young's modulus Y is subjected to stretching stress S, elastic energy stored per unit volume of the material is

When a block of mass M is suspended by a long wire of length L. the length of the wire becomes (L + l) . The elastic potential energy stored in the extended wire is:

The stress-strain curves are drawn for two different materials X and Y. It is observed that the ultimate strength point and the fracture point are close to each other for material X but are far apart for material Y. We can say that materials X and Y are likely to be (respectively).

Plastic and ductile

Ductile and brittle

Brittle and ductile

Brittle and plastic

When this wire is subjected to a constant force 'F', the extension produced in the wire is 'Al'. Which of the following graphs is a straight line?

The Young's modulus of steel is twice that of brass. Two wires of same length and of same area of cross section, one of steel and another of brass are suspended from the same roof. If we want the lower ends of the wires to be at the same level, then the weights added to the steel and brass wires must be in the ratio of:

2 : 1

4 : 1

1 : 1

1 : 2

The following four wires are made of the same material. Which of these will have the largest extension when the same tension is applied?

Length = 100cm diameter = 1mm

Length = 200cm diameter = 2mm

Length = 300cm diameter = 3mm

Length = 50cm diameter = 0.5mm

Two wires A and B are of the same material. Their lengths are in the ratio 1/2 and the diameter are in the ratio 2/1 If they are pulled by the same force, then increase in length will be in the ratio

2 : 1

1 : 4

1 : 8

8 : 1

Two wires are made of the same material and have the same volume. The first wire has cross sectional area A and the second wire has cross sectional area 3A. If the length of the first wire is increased by ∆l on applying a force F, how much force is needed to stretch the second wire by the same amount?

The bulk modulus of a spherical object is 'B'. If it is subjected to uniform pressure 'p', the fractional decrease in radius isS

$The bulk modulus of a spherical object is 'B'. If it is subjected to uniform pressure 'p', the fractional decrease in radius isS$

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