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Set 5 of 5 · Questions 121-125 of 125

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NEET Physics · Mechanical Properties of Solids · Set 5 (Q121-125)

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  1. 121.
    Let a wire be suspended from the ceiling (rigid support) and stretched by a weight attached at its free end. The longitudinal stress at any point of cross-sectional area of the wire is [NEET 2023]
    1. (1)
    2. (2)
    3. (3)zero
    4. (4)
  2. 122.
    Under the same load, wire A having length 5.0 m and cross section 2.5 x stretches uniformly by the same amount as another wire B of length 6.0 m and a cross section of 3.0 x stretches. The ratio of the Young's modulus of wire A to that of wire B will be:
    1. (1)1:4
    2. (2)1 : 1
    3. (3)1 : 10
    4. (4)1 : 2
  3. 123.
    A steel wire of length 3.2 m ( = 2.0 x ) and a copper wire of length 4.4 M ( = 1.1 x ), both of radius 1.4 mm are connected end to end. When stretched by a load, the net elongation is found to be 1.4 mm. The load applied, in Newton, will be: (Given )
    1. (1)360
    2. (2)180
    3. (3)1080
    4. (4)154
  4. 124.
    Consider two separate ideal gases of electrons and protons having same number of particles. The temperature of both the gases are same. The ratio of the uncertainty in determining the position of an electron to that of a proton is proportional to:-
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  5. 125.
    The force required to stretch a wire of cross-section 1 to double its length will be: (Given Yong's modulus of the wire = 2 x N/)
    1. (1)1 x N
    2. (2)1.5 x N
    3. (3)2 x N
    4. (4)2.5 x N