Elastic Moduli, Class 11 Physics NCERT Solutions

1. There will be total 10 MCQ in this test.
2. Please keep a pen and paper ready for rough work but keep your books away.
3. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number.
4. No negative marking for incorrect choice.
5. Please click on “Finish the Test” when you want to exit.
6. All the best – Happy Studying

1. An Indian rubber cube of side 10 cm has one side fixed while a tangential force of 1800 N is applied to the opposite side. Find the shear strain produced. Take η = 2 x 10⁶ N/ m².

 0.09

 0.009

 0.9

  9

Question 1 of 10

2. The length of the wire is increased by 1 mm on the application of a given load. In a wire of the same material but of length and radius twice that of the first, on application of the same force, extension produced is

 0.25 mm

  2 mm

 4 mm

 0.5 mm

Question 2 of 10

3. Young’s modulus is defined as the ratio of longitudinal stress to longitudinal strain. Which of the following is the unit of Young’s modulus?

  dyne per square cm.

 dyne cm²

 dyne/cm

 dyne cm

Question 3 of 10

4. The volume of a spherical body is decreased by 10^-3% when it is subjected to pressure of 40 atmospheres. Find the bulk modulus of body.
(1 atm = 1.01 x 10³ N/m²).

 4.04 x 10¹¹ N/m²

  4.04 x 10⁶N/m²

 4.04 x 10³ N/m²

  4.04 x 10² N/m²

Question 4 of 10

5. A wire of length L and cross section area A is made of a material of Young’s modulus Y. If the wire is stretched by an amount x, the work done is

 A

 B

 C

 D

Question 5 of 10

6. How does the modulus of elasticity change with temperature?

 It does not depend on temperature

  It decreases with increase in temperature

 It increases with increase in temperature

 It sometimes increases, sometimes decreases with increase in temperature

Question 6 of 10

7. What type of stress is produced in a body when the deforming force produces sheer strain?

 Tangential stress

 Longitudinal stress

 Normal stress

  shear stress

Question 7 of 10

8. Modulus of rigidity is defined as the

  ratio of tangential stress to tangential strain

 ratio of normal stress to sheer strain

 ratio of normal stress to tangential strain

 ratio of tangential stress to sheer strain

Question 8 of 10

9. Which of the following represents Hooke’s Law?

 A

 B

 C

 D

Question 9 of 10

10. An iron bar of length l cm and cross section A cm2 is pulled by a force F dynes from the ends so as to produce an elongation l cm. Which of the following statements is correct?

 Elongation is directly proportional to area of cross-section A.

 Elongation is inversely proportional to length.

 Elongation is inversely proportional to area of cross-section A.

 Elongation is directly proportional to Young’s modulus.

Question 10 of 10

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