CBSE Class 10 Science Sample Paper 2014 (21)

CBSE Class 10 Science Sample Paper 2014 (21). Based on CBSE and NCERT guidelines. The students should practice these Question Papers to gain perfection which will help him to get more marks in CBSE examination. Please refer to more CBSE Class 10 question papers in other links. The CBSE Question papers are prepared based on trend in past examinations and expected questions in CBSE exams. Its always recommended by CBSE to practice the papers released by CBSE to get better exams in CBSE exams. CBSE Last Year Question Papers for class 10 for final/ term/ SA1/ SA2 Examinations conducted by Central Board of Secondary Education for all CBSE affiliated schools in India and abroad. Please refer to more CBSE Class X sample papers, question papers, HOTs etc in other links.

SECTION A

1. Dry Hydrogen Chloride gas does not turn blue litmus red whereas Hydrochloric acid does. Give one reason.

2. Identify the substance oxidized in the chemical reaction:

       MnO2 + 4 HCl Mn Cl2 + Cl2 + 2H2O

3. You are given two resistors of 5? and 20 ?, a battery of emf 2.5V, a key and an ammeter. Draw a circuit diagram of all given components such that the ammeter gives a reading of 0.1A.

4. Sketch magnetic field lines around a current carry straight conductor.

5. A household uses the following electric appliances:

   (i) Refrigerator of rating 400 W for ten hours each day.

   (ii) Two electric fans of rating 80 W each for twelve hours each day.

   (iii) Six electric tubes of rating 18 W each for 6 hours each day. Calculate the electricity bill of the household for the month of June if the cost per unit of electric energy is Rs. 3.00.

6. What is meant by the term 'frequency' of an alternating current? What is its value in India? Why is an alternating current considered to be advantageous over direct current for long range transmission of electric energy?

7. An old person is unable to see clearly nearby objects as well as distant objects.

    a) What defect of vision is he suffering from?

    b) What kind of lens will be required to see clearly the nearby as well as distant objects? Give reasons.

8. State two criteria each in the selection of each of the following:

    (i) good fuel

    (ii) good source of energy

9. (a) Name two elements which can be used for generation of electricity in a nuclear power plant.

   (b) Why many nuclear power plants could not be installed in our country? Give two reasons.

10. A student dropped few pieces of marble in dilute Hydrochloric acid contained in a test tube. The evolved gas was passed through lime water. What change would be observed in lime water? Write balanced chemical equations for the reaction when 

   (i) gas was evolved

   (ii) gas was passed through lime water.

11. Atomic number is considered to be a more appropriate parameter than atomic mass for classification of elements in a periodic table. Why? How does metallic character of elements vary on moving from

      (i) left to right in a period

      (ii) from top to bottom in a group. Give reasons for your answers.

Please refer to attached file for CBSE Class 10 Science Sample Paper 2014 (21)

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