Physics 9th Chap 1 Topic 11(Estimates of physical quantities)

Physics Chapter 1 (Topic 11 : Estimates of physical quantities )

Make reasonable estimates of physical quantities [of those that
are discussed in the topics of this grade level]

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Q1. Which is the most reasonable estimate of the length of a classroom?

A) 0.5 m

B) 5 m

C) 50 m

D) 500 m

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Q2. The best estimate for the mass of a physics textbook is:

A) 5 g

B) 500 g

C) 50 kg

D) 500 kg

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Q3. The approximate time taken for one heartbeat is:

A) 0.1 s

B) 1 s

C) 10 s

D) 60 s

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Q4. Which is a reasonable estimate of human walking speed?

A) 0.1 m/s

B) 1–2 m/s

C) 20 m/s

D) 100 m/s

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Q5. The best estimate for the height of a door is:

A) 0.5 m

B) 2 m

C) 5 m

D) 20 m

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Q6. Approximate mass of a mobile phone is:

A) 10 g

B) 100 g

C) 10 kg

D) 1000 kg

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Q7. The best estimate for the temperature of boiling water is:

A) 0°C

B) 50°C

C) 100°C

D) 200°C

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Q8. Which is a reasonable estimate of the speed of a bicycle?

A) 0.5 m/s

B) 5 m/s

C) 50 m/s

D) 500 m/s

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Q9. Approximate length of a pen is:

A) 1 cm

B) 15 cm

C) 1 m

D) 10 m

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Q10. Best estimate of Earth’s gravitational field strength is:

A) 1 N/kg

B) 5 N/kg

C) 9.8 N/kg

D) 100 N/kg

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Q11. Approximate mass of a student is:

A) 5 kg

B) 50 kg

C) 500 kg

D) 5000 kg

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Q12. Reasonable estimate of classroom chalk length is:

A) 0.1 mm

B) 10 cm

C) 1 m

D) 10 m

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Q13. Time taken for one school period is approximately:

A) 5 seconds

B) 5 minutes

C) 40–45 minutes

D) 5 hours

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Q14. Best estimate for thickness of a page of book is:

A) 0.1 mm

B) 1 cm

C) 10 cm

D) 1 m

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Q15. Approximate distance between two classrooms is:

A) 1 cm

B) 1 m

C) 10 m

D) 1000 m

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Q16. Which is a reasonable estimate of human reaction time?

A) 0.2 s

B) 2 s

C) 20 s

D) 200 s

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Q17. Approximate temperature of human body is:

A) 0°C

B) 20°C

C) 37°C

D) 100°C

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Q18. Best estimate of mass of an apple is:

A) 10 g

B) 100 g

C) 10 kg

D) 1000 kg

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Q19. Reasonable estimate of speed of a car in city traffic is:

A) 2 m/s

B) 10–15 m/s

C) 100 m/s

D) 1000 m/s

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Q20. Approximate thickness of a coin is:

A) 0.1 mm

B) 1–2 mm

C) 10 cm

D) 1 m

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Q21. Best estimate for height of a human is:

A) 0.5 m

B) 1.5–1.8 m

C) 5 m

D) 20 m

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Q22. Approximate value of speed of sound in air is:

A) 3 m/s

B) 30 m/s

C) 340 m/s

D) 3000 m/s

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Q23. Best estimate of mass of a school bag is:

A) 0.5 kg

B) 5 kg

C) 50 kg

D) 500 kg

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Q24. Approximate time for one minute is:

A) 1 s

B) 10 s

C) 60 s

D) 600 s

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Q25. Best estimate of width of a notebook is:

A) 5 cm

B) 15 cm

C) 1 m

D) 10 m

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Q26. Which is most reasonable estimate of gravitational acceleration?

A) 1 m/s²

B) 5 m/s²

C) 9.8 m/s²

D) 50 m/s²

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Q27. Approximate mass of an eraser is:

A) 2 g

B) 20 g

C) 2 kg

D) 20 kg

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Q28. Best estimate of length of a football field is:

A) 10 m

B) 50 m

C) 100 m

D) 1000 m

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Q29. Approximate value of walking distance in 10 minutes is:

A) 10 m

B) 100 m

C) 1 km

D) 100 km

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Q30. Best estimate for thickness of human hair is:

A) 0.1 mm

B) 1 mm

C) 1 cm

D) 1 m

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Q31. Reasonable estimate of time for blinking eye is:

A) 0.1 s

B) 2 s

C) 20 s

D) 200 s

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Q32. Best estimate of mass of a car is:

A) 10 kg

B) 100 kg

C) 1000 kg

D) 10,000 kg

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Q33. Approximate speed of light is:

A) 3 × 10³ m/s

B) 3 × 10⁵ m/s

C) 3 × 10⁸ m/s

D) 3 × 10¹⁰ m/s

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Q34. Best estimate of length of a pencil is:

A) 2 cm

B) 15 cm

C) 1 m

D) 5 m

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Q35. Which estimation is most reasonable for classroom window height?

A) 0.5 m

B) 1–2 m

C) 10 m

D) 50 m

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Q36. Best estimate of mass of a watermelon is:

A) 0.5 kg

B) 5 kg

C) 50 kg

D) 500 kg

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Q37. Approximate time for one day is:

A) 60 s

B) 60 min

C) 12 h

D) 24 h

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Q38. Best estimate of thickness of steel wire is:

A) 0.1 mm

B) 1 mm

C) 1 cm

D) 10 cm

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Q39. Which is most reasonable estimate of classroom fan speed perception?

A) 0 m/s

B) 1 m/s

C) 10 m/s

D) 100 m/s

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Q40. Best estimate of height of a table is:

A) 10 cm

B) 50–80 cm

C) 5 m

D) 20 m

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