ISTC Previous Year Papers and Practice Questions

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Practice set (12 questions)

These questions are written by ISTCKonnect for practice at Class 10 level. They are not from any ISTC paper.

1. Mathematics If 3x - 7 = 11, what is x?

   1. 4
   2. 5
   3. 6
   4. 7
   Show answer

   C. 6 3x = 18, so x = 6.

2. Mathematics What is the LCM of 12 and 18?

   1. 36
   2. 54
   3. 72
   4. 6
   Show answer

   A. 36 12 = 2x2x3 and 18 = 2x3x3, so LCM = 2x2x3x3 = 36.

3. Mathematics Area of a circle of radius 7 cm (take pi = 22/7):

   1. 44 sq cm
   2. 154 sq cm
   3. 49 sq cm
   4. 308 sq cm
   Show answer

   B. 154 sq cm pi r squared = 22/7 x 49 = 154.

4. Mathematics The value of sin 30 degrees is:

   1. 1
   2. 0
   3. 1/2
   4. root 3 / 2
   Show answer

   C. 1/2 sin 30 degrees = 1/2.

5. Science The SI unit of electric current is:

   1. Volt
   2. Ohm
   3. Watt
   4. Ampere
   Show answer

   D. Ampere Current is measured in amperes.

6. Science A 10 ohm resistor carries 2 A of current. The voltage across it is:

   1. 5 V
   2. 12 V
   3. 20 V
   4. 0.2 V
   Show answer

   C. 20 V V = IR = 2 x 10 = 20 V.

7. Science The pH of pure water at 25 degrees C is:

   1. 0
   2. 7
   3. 14
   4. 1
   Show answer

   B. 7 Pure water is neutral, pH 7.

8. Science Which lens is used to correct myopia (short-sightedness)?

   1. Convex
   2. Concave
   3. Bifocal
   4. Cylindrical
   Show answer

   B. Concave A concave (diverging) lens corrects myopia.

9. Aptitude Next number: 2, 6, 12, 20, 30, ?

   1. 40
   2. 42
   3. 36
   4. 44
   Show answer

   B. 42 Differences are 4, 6, 8, 10, 12. So 30 + 12 = 42.

10. Aptitude A train covers 180 km in 3 hours. Its speed is:

    1. 50 km/h
    2. 60 km/h
    3. 90 km/h
    4. 45 km/h
    Show answer

    B. 60 km/h 180 / 3 = 60 km/h.

11. English Choose the word closest in meaning to RAPID:

    1. Slow
    2. Quick
    3. Heavy
    4. Rare
    Show answer

    B. Quick Rapid means quick.

12. General Knowledge The Indo Swiss Training Centre is a part of which CSIR laboratory?

    1. CSIR-NPL
    2. CSIR-CSIO
    3. CSIR-NCL
    4. CSIR-CRRI
    Show answer

    B. CSIR-CSIO ISTC functions as part of CSIR-Central Scientific Instruments Organisation, Chandigarh.

Scoring tip: count your score as (correct) minus 0.25 x (wrong). If you got 10 right and 2 wrong, your score is 9.5.