Properties Of Matter Mock Tests

The metal that is the best conductor of electricity is:

Water flows through a horizontal pipe of varying cross-section. At one point the speed of water is 1 m/s and the pressure is 20000 Pa. At another point the speed is 3 m/s. The pressure at this point is: (density of water = 1000 kg/m³)

A steel wire of length 2 m and cross-sectional area 1 mm² is heated by 100°C. If the wire is free to expand, the thermal stress developed is (take Young's modulus Y = 200 GPa and coefficient of linear expansion α = 1.2 × 10⁻⁵/°C):

The most penetrating radiation is:

A metal wire of length L and cross-sectional area A is stretched by a force F. If the Youngs modulus of the material is Y and the wire obeys Hooke law, the elastic potential energy stored per unit volume is

The gas most abundantly present in the pure dry air of atmosphere is:

A wire of length L and cross-section A extends by 1 mm when a force F is applied. Another wire of the same material, but with length 2L and area A/2, is subjected to the same force. The extension is:

The process of conversion of a solid directly into gas without passing through the liquid state is called: