Day 161: CBSE Class 10 Science

1. A.
   Diagram (A) as printed - a magnetic field-line pattern around a current carrying circular loop; see the attached figure.
2. B.
   Diagram (B) as printed - a magnetic field-line pattern around a current carrying circular loop; see the attached figure.
3. C.
   Diagram (C) as printed - a magnetic field-line pattern around a current carrying circular loop; see the attached figure.
4. D.
   Diagram (D) as printed - a magnetic field-line pattern around a current carrying circular loop; see the attached figure.

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1. A.
   both pointing into the plane of the paper.
2. B.
   both pointing out of the plane of the paper.
3. C.
   pointing into the plane of the paper and out of the plane of the paper respectively.
4. D.
   pointing out of the plane of the paper and into the plane of the paper respectively.

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1. A.
   It reacts only with acid and does not form water.
2. B.
   It reacts with acid as well as base to form salt and hydrogen gas.
3. C.
   It reacts with both acid as well as base to form salt and water.
4. D.
   It reacts only with base and does not form water.

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1. A.
   Less violent, but the heat evolved is sufficient for the hydrogen to catch fire.
2. B.
   Very violent and exothermic and hydrogen catches fire.
3. C.
   Exothermic, but the heat evolved is not sufficient for the hydrogen to catch fire.
4. D.
   Slow and endothermic.

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