CBSE Class 10 Science: Term 1 Physics & Chemistry Standard Mock

Instructions. Official CBSE format. Darken bubbles completely with blue/black pen.

1. 1.

   Which of the following mirror is used by dentists to examine a small cavity in a patient's teeth?

   1. (A)

      Convex mirror

   2. (B)

      Plane mirror

   3. (C)

      Concave mirror

   4. (D)

      Any spherical mirror

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   Answer: (C)

   Concave mirror

   A concave mirror produces an erect, magnified virtual image when the object is held close within its focal length.

   Light - Reflection and Refraction · Easy

2. 2.

   What happens when dilute hydrochloric acid is added to iron filings?

   1. (A)

      Hydrogen gas and iron chloride are produced.

   2. (B)

      Chlorine gas and iron hydroxide are produced.

   3. (C)

      No reaction takes place.

   4. (D)

      Iron salt and water are produced.

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   Answer: (A)

   Hydrogen gas and iron chloride are produced.

   $Fe(s) + 2HCl(aq) \to FeCl_2(aq) + H_2(g)$. Hydrogen gas burns with a pop sound.

   Chemical Reactions and Equations · Medium

3. 3.

   The breakdown of pyruvate to give carbon dioxide, water and energy takes place in:

   1. (A)

      Cytoplasm

   2. (B)

      Mitochondria

   3. (C)

      Chloroplast

   4. (D)

      Nucleus

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   Answer: (B)

   Mitochondria

   Aerobic respiration breaks down pyruvate in the mitochondria, yielding ATP, $CO_2$, and $H_2O$.

   Life Processes · Easy

4. 4.

   The electrical resistivity of a given metallic wire depends upon:

   1. (A)

      Its length

   2. (B)

      Its thickness

   3. (C)

      Its shape

   4. (D)

      Nature of the material

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   Answer: (D)

   Nature of the material

   Resistivity ($\rho$) is an intrinsic characteristic of the material and its temperature; resistance depends on length and area.

   Electricity · Medium

— End of the paper · updated 2 November 2026 —