CBSE  /  Class 11  /  Physics  /  Mechanical Properties of Solids

  • 1. 
    Four wires whose lengths and diameter respectively are given below are made of the same material. Which of these will have the largest extension when same tension is applied?

  • 0.50 m, 0.50 mm
  • 1.00 mm, 1.00 mm
  • 2.00 m, 2.00 mm
  • 4.00 m, 4.00 mm

  • 2. 
    When the intermolecular distance increases due to tensile force, then

  • There is no force between the molecules
  • There is a repulsive force between the molecules
  • There is an attractive force between the molecules
  • There is zero resultant force between the molecules

  • 3. 
    A body of mass 1 kg is attached to one end of a wire and rotated in horizontal circle of diameter 40 cm with a constant speed of 2 m/s. what is the area of cross-section of the wire if the stress developed in the wire is 5 × 106 N/m²?

  • 2 mm²
  • 3 mm²
  • 4 mm²
  • 5 mm²

  • 4. 
    One end of a steel wire of area of cross-section 3 mm² is attached to the ceiling of an elevator moving up with an acceleration of 2.2 m/s². if a load of 8 kg is attached at its free end, then the stress developed in the wire will be

  • 8 × 106 N/m²
  • 16 × 106 N/m²
  • 20 × 106 N/m²
  • 32 × 106 N/m²

  • 5. 
    The ratio of the change in dimension at right angles to the applied force to the initial dimension is known as

  • Youngs modulus
  • Poissons ratio
  • Lateral strain
  • Shearing strain

  • 6. 
    The magnitude of the force developed by raising the temperature from 0°C to 100°C of the iron bar of 1.00 m long and 1 cm² cross-section when it is held so that it is not permitted to expand or bend is (a = 10-5/oC and Y = 1011 N/m²)

  • 103 N
  • 104 N
  • 105
  • 109 N

  • 7. 
    The upper end of wire 1 m long and 2 mm radius is clamped. The lower end is twisted through an angle of 45°. The angle of shear is

  • 0.09°
  • 0.9°
  • 9°
  • 90°

  • 8. 
    The radii of two wires of a same material are in ratio 2 : 1. if the wires are stretched by equal forces, the stress produced in them will be

  • 2 : 1
  • 4 : 1
  • 1 : 4
  • 1 : 2

  • 9. 
    A rubber cord of cross sectional area 1 mm² and unstretched length 10 cm is stretched to 12 cm and then released to project a stone of mass 5 gram. If Y for rubber = 5 ? 108N/m², then the tension in the rubber cord is

  • 25 N
  • 50 N
  • 100 N
  • 200 N

  • 10. 
    In a wire, when elongation is 2 cm energy stored is E. if it is stretched by 10 cm, then the energy stored will be

  • E
  • 2 E
  • 4 E
  • 25 E
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