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A catalyst is a substance which
A closed vessel containing some gas at atmospheric pressure and room temperature is placed in a fast moving train. The temperature of the gas will
A colloidal system in which a liquid is dispersed in a liquid is called
A convex lens and concave lens each having the same focal length of 25 cm, are put in contact to form a combination of lenses. The power (in dioptres) of the combination is :
A convex lens of glass has power P in air. If it is immersed in water its power will be :
A current loop in a magnetic field :
A current of 5 A is passing through a metallic wire of cross-sectional area 4 × 10-6 m2. If the density of the charge carriers in the wire is 5 × 1026 m-3, the drift velocity of the electrons is :
A current of 5 A is passing through a metallic wire of cross-sectional area 4 × 10^-6 m². If the density of the charge carriers in the wire is 5 × 10^26 m^-3, the drift velocity of the electrons is :
A cyclotron is used to obtain a 2 meV beam of protons. The alternating potential difference applied between the dees has a peak value of 20 kV and its frequency is 5 MHz. The intensity of magnetic field to be applied for resonance will be:
A detergent is a
