Subject

Science

Class

CBSE Class 10

Pre Boards

Practice to excel and get familiar with the paper pattern and the type of questions. Check you answers with answer keys provided.

Sample Papers

Download the PDF Sample Papers Free for off line practice and view the Solutions online.
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 Multiple Choice QuestionsMultiple Choice Questions

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11.

The color of an aqueous solution of zinc sulphate as observed in the laboratory is:

  • Green 

  • Yellow 

  • Blue

  • Blue


D.

Blue

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12.

To show that zinc is a more active metal than copper, the correct procedure is to: 

  • Add dilute nitric acid on strips of both the metals. 

  • Observe transmission of heat through strips of zinc and copper. 

  • Prepare a solution of zinc sulphate and hang a strip of copper into it. 

  • Prepare a solution of zinc sulphate and hang a strip of copper into it. 

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13.

Acetic acid smells like: 

  • a banana 

  • Vinegar

  • an orange

  • an orange

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14.

Acetic acid solution turns: 

  • blue litmus red 

  • red litmus blue 

  • blue litmus colourless 

  • blue litmus colourless 

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15.

On adding NaHCO3 to acetic acid, a gas is evolved which turns lime water milky due to the formation of:

  • Calcium bicarbonate 

  • Calcium hydroxide

  • Calcium carbonate 

  • Calcium carbonate 

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16.

A yeast cell in which budding occurs was seen to have: 

  • one bud cell 

  • two bud cell 

  • three bud cell 

  • three bud cell 

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 Multiple Choice QuestionsShort Answer Type

17.

What are the various steps in a food chain called?

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18.

What is the important function of the presence of ozone in earth’s atmosphere?

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19.

Write the electron dot structure of ethane molecule, C2H6.

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20.

What makes the earth’s atmosphere a heterogeneous mixture?

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