Mechanical Properties of Solids Test

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Mechanical Properties of Solids Test - 6

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Weekly Quiz Competition

Question 1
4 / -1

When a wire of length 10 m is subjected to a force of 100 N along its length, the lateral strain produced is 0.01× 10^-3m. The Poisson\'s ratio was found to be 0.4. If the area of cross-section of wire is 0.025 m² , its Young\'s modulus is

A
1.6 × 10⁸ Nm ^-2

B
2.5 × 10¹⁰ Nm ^-2

C
1.25 ×10¹¹ Nm ^-2

D
16 ×10⁹ Nm ^-2
Question 2
4 / -1

A cube of side 40 mm has its upper face displaced by 0.1 mm by a tangential force of 8 kN. The shearing modulus of cube is

A
2 × 10⁹ Nm^-2

B
4 × 10⁹ Nm^-2

C
8 × 10⁹ Nm^-2

D
16 × 10⁹ Nm^-2

Solution
Question 3
4 / -1

Assertion (A) Ductile metals are used to prepare thin wires.
Reason (R) In the stress – strain curve of ductile metals, the length between the points representing elastic limit and breaking point is very small.

A
Both A and R are true and R is the correct explanation of A

B
Both A and R are true but R is not the correct explanation of A

C
A is true but R is false

D
A is false but R is true
Question 4
4 / -1

The pressure of a medium is changed from 1.01 × 10⁵ Pa to 1.165 × 10⁵ Pa and change in volume is 10% keeping temperature constant. The Bulk modulus of the medium is

A
204.8 × 10⁵ Pa

B
102.4 × 10⁵ Pa

C
51.2 × 10⁵ Pa

D
1.55 × 10⁵ Pa

Solution
Question 5
4 / -1

The radii and Young\'s modulii of two uniform wires A and B are in the ratio 2 : 1 and 1 : 2, respectively. Both wires are subjected to the same longitudinal force. If the increase in length of the wire A is one percent, the percentage increase in length of the wire B is

A
1.0

B
1.5

C
2.0

D
3.0
Question 6
4 / -1

The increase in length is l of a wire of length L by the longitudinal stress. Then the stress is proportional to

A
L/l

B
l/L

C
l × L

D
l² × L

Solution
Question 7
4 / -1

Which is the most elastic ?

A
Iron

B
Copper

C
Quartz

D
Wood
Question 8
4 / -1

The material which practically does not show elastic effect is

A
Copper

B
Rubber

C
Steel

D
Quartz
Question 9
4 / -1

A force F is needed to break a copper wire having radius R. The force needed to break a copper wire of radius 2R will be

A
F/2

B
2F

C
4F

D
F/4
Question 10
4 / -1

Why the spring is made up of steel in comparison of copper ?

A
Copper is more costly than steel

B
Copper is more elastic than steel

C
Steel is more elastic than copper

D
None of the above

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Re-Attempt Weekly Quiz Competition

Mechanical Properties of Solids Test - 6

Result

Mechanical Properties of Solids Test - 6

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SHARING IS CARING

Question 1

1.6 × 108 Nm -2

2.5 × 1010 Nm -2

1.25 ×1011 Nm -2

16 ×109 Nm -2

Question 2

2 × 109 Nm-2

4 × 109 Nm-2

8 × 109 Nm-2

16 × 109 Nm-2

Solution

Question 3

Both A and R are true and R is the correct explanation of A

Both A and R are true but R is not the correct explanation of A

A is true but R is false

A is false but R is true

Question 4

204.8 × 105 Pa

102.4 × 105 Pa

51.2 × 105 Pa

1.55 × 105 Pa

Solution

Question 5

1.0

1.5

2.0

3.0

Question 6

L/l

l/L

l × L

l2 × L

Solution

Question 7

Iron

Copper

Quartz

Wood

Question 8

Copper

Rubber

Steel

Quartz

Question 9

F/2

2F

4F

F/4

Question 10

Copper is more costly than steel

Copper is more elastic than steel

Steel is more elastic than copper

None of the above

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1.6 × 10⁸ Nm ^-2

2.5 × 10¹⁰ Nm ^-2

1.25 ×10¹¹ Nm ^-2

16 ×10⁹ Nm ^-2

2 × 10⁹ Nm^-2

4 × 10⁹ Nm^-2

8 × 10⁹ Nm^-2

16 × 10⁹ Nm^-2

204.8 × 10⁵ Pa

102.4 × 10⁵ Pa

51.2 × 10⁵ Pa

1.55 × 10⁵ Pa

l² × L