Young's Modulus-Basic

Dear Readers,

Compared to other sections, Physics is considered to be the most scoring section. If prepared thoroughly, Physics can help students to secure a meritorious position in the exam. These questions are very important in achieving your success in Exams after 12th.

Q1. In the Young’s experiment, if length of wire and radius both are doubled then the value of Y will become

  •  2 times
  •  4 times
  •  Remain same
  •  half

Remain same

Q2.  A rubber cord catapult has cross-sectional area 25mm2 and initial length of rubber cord is 10cm. It is stretched to 5cm. and then released to project a missile of mass 5gm. Taking velocity of projected missile is

  •  20 ms–1
  •  100 ms–1
  •  250 ms–1
  •  200 ms–1

250 ms–1

Q3. Which one of the following substances possesses the highest elasticity

  •  Rubber
  •  Glass
  •   Steel
  •  Copper


Q4. There are two wires of same material and same length while the diameter of second wire is 2 times the diameter of first wire, then ratio of extension produced in the wires by applying same load will be

  •  1:1
  •  2:1
  •  1:2
  •  4:1


Q5. The longitudinal extension of any elastic material is very small. In order to have an appreciable change, the material must be in the form of

  •  Thin block of any cross section
  •  Thick block of any cross section
  •  Long thin wire
  •   Short thin wire

Long thin wire

Q6. In suspended type moving coil galvanometer, quartz suspension is used because

  •  It is good conductor of electricity
  •  Elastic after effects are negligible
  •  Young’s modulus is greater
  •  There is no elastic limit

Elastic after effects are negligible

Q7.  The force constant of a wire does not depend on

  •  Nature of the material
  •  Radius of the wire
  •  Length of the wire
  •  None of the above

None of the above

Q8. You are given three wires A, B and C of the same length and cross section. They are each stretched by applying the same force to the ends. The wire A is stretched least and comes back to its original length when the stretching force is removed. The wire B is stretched more than A and also comes back to its original length when the stretching force is removed. The wire C is stretched most and remains stretched even when stretching force is removed. The greatest Young’s modulus of elasticity is possessed by the material of wire

  •  A
  •  B
  •  C
  •  All have the same elasticity


Q9.  The ratio of diameters of two wires of same material is n : 1. The length of wires are 4 m each. On applying the same load, the increase in length of thin wire will be

  •  n2 times
  •  n times
  •  2n times
  •  None of the above

n2 times

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Young's Modulus-Basic
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