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  1. A steady current of 1.5 amp flows through a copper voltmeter for 10 minutes
  2. The half life of radium is 1620 yr and its atomic weight is 226 kg per kilo mol.
  3. Two charged particles have charges and masses in the ratio 2:3 and 1:4 respectively.
  4. Electrons in a certain energy level n=n₁, can emit 3 spectral lines. When they
  5. A boat of anchor is rocked by waves whose crests are 100 m apart and velocity