Class X

Focal length of plane mirror is
  1. At infinity
  2. Zero
  3. Negative
  4. None of these
. Which of the following statements is/are true? 1. The process of oxidation leads to a gain of electrons. 2. The process of oxidation leads to a Toss of electrons. 3. The process of reduction leads to a gain of electrons. 4. The process of reduction leads to a loss of electrons.
  1. l only
  2. l and 4
  3. 2 and 3
  4. 4 only
Which of the following substances undergoes chemical change on heating?
  1. Sodium chloride
  2. Silica
  3. Lead nitrate
  4. Platinum wire
Which of the following causes the rusting of iron? 1. Oxidation 2. Reduction 3. Chemical reaction with oxygen 4. Chemical reaction with CO
  1. l and 2
  2. 2 and 3
  3. 3 and 4
  4. l and 3
Which of the following is commonly called a ‘polyamide’?
  1. Rayon
  2. orlon
  3. Terylene
  4. Nylon
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