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11th Standard English Medium Physics Subject Properties of Matter Creative 3 Mark Questions with Solution Part - II

11th Standard

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Physics

Time : 00:30:00 Hrs
Total Marks : 15
    4 x 3 = 12
  1. Stress - Strain curve for two wires of material A and B are as shown in figure.

    (a) Which material in more ductile?
    (b) Which material has greater value of young's modulus?
    (c) Which of the two is stronger material?
    (d) Which material is more brittle?

  2. A body floats in water with 40% of its volume outside water. When the same body floats in oil 60% of its volume, remains outside oil. What is the relative density of the oil?

  3. A light rod of length 2m is suspended horizontally by means of 2 vertical wires of equal lengths tied to its ends. One of the wires is made of steel & is of cross section A1 = 0.1 cm2 & other of brass & is of cross section A2 = 0.2 cm2, find out the position along the rod at which a weight must be suspended to produce
    (i) equal stresses in both wires
    (ii) equai strains in both wires for steel, y = 20\(\times\)1010 Nm-2 & for brass y =10\(\times\)1010 Nm-2.

  4. Athin rod of negligible mass and area of cross sectional 4\(\times\)10-6m2, suspended vertically from one end has a length of 0.5 at 100°C the rod is cooled at 00C, but prevented from contracting by attaching a mass at lower end. Find
    (i) mass
    (ii) the energy stored in rod. Given for rod, y =1011 Nm-2, coefficient of linear expansion = 10-5 k-1 & g = 10 ms-2.

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