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

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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]

1 / 40

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

A) 500 m

B) 5 m

C) 0.5 m

D) 50 m

2 / 40

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

A) 5 g

B) 50 kg

C) 500 g

D) 500 kg

3 / 40

The approximate time taken for one heartbeat is:

A) 0.1 s

B) 60 s

C) 1 s

D) 10 s

4 / 40

Which is a reasonable estimate of human walking speed?

A) 0.1 m/s

B) 1 - 2 m/s

C) 100 m/s

D) 20 m/s

5 / 40

The best estimate for the height of a door is:

A) 2 m

B) 20 m

C) 5 m

D) 0.5 m

6 / 40

Approximate mass of a mobile phone is:

A) 100 g

B) 10 g

C) 10 kg

D) 1000 kg

7 / 40

The best estimate for the temperature of boiling water is:

A) 100°C

B) 200°C

C) 50°C

D) 0°C

8 / 40

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

A) 500 m/s

B) 50 m/s

C) 0.5 m/s

D) 5 m/s

9 / 40

Approximate length of a pen is:

A) 10 m

B) 1 m

C) 15 cm

D) 1 cm

10 / 40

Best estimate of Earth’s gravitational field strength is:

A) 9.8 N / kg

B) 5 N / kg

C) 1 N / kg

D) 100 N / kg

11 / 40

Approximate mass of a student is:

A) 5 kg

B) 50 kg

C) 500 kg

D) 5000 kg

12 / 40

Reasonable estimate of classroom chalk length is:

A) 10 cm

B) 1 m

C) 0.1 mm

D) 10 m

13 / 40

Time taken for one school period is approximately:

A) 40 - 45 minutes

B) 5 minutes

C) 5 hours

D) 5 seconds

14 / 40

Best estimate for thickness of a page of book is:

A) 10 cm

B) 1 cm

C) 1 m

D) 0.1 mm

15 / 40

Approximate distance between two classrooms is:

A) 10 m

B) 1 cm

C) 1 m

D) 1000 m

16 / 40

Which is a reasonable estimate of human reaction time?

A) 20 s

B) 2 s

C) 0.2 s

D) 200 s

17 / 40

Approximate temperature of human body is:

A) 100°C

B) 37°C

C) 0°C

D) 20°C

18 / 40

Best estimate of mass of an apple is:

A) 100 g

B) 10 g

C) 1000 kg

D) 10 kg

19 / 40

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

A) 100 m/s

B) 10 - 15 m/s

C) 2 m/s

D) 1000 m/s

20 / 40

Approximate thickness of a coin is:

A) 10 cm

B) 0.1 mm

C) 1 m

D) 1 - 2 mm

21 / 40

Best estimate for height of a human is:

A) 20 m

B) 0.5 m

C) 1.5 - 1.8 m

D) 5 m

22 / 40

Approximate value of speed of sound in air is:

A) 30 m/s

B) 340 m/s

C) 3000 m/s

D) 3 m/s

23 / 40

Best estimate of mass of a school bag is:

A) 50 kg

B) 0.5 kg

C) 5 kg

D) 500 kg

24 / 40

Approximate time for one minute is:

A) 600 s

B) 60 s

C) 1 s

D) 10 s

25 / 40

Best estimate of width of a notebook is:

A) 15 cm

B) 1 m

C) 5 cm

D) 10 m

26 / 40

Which is most reasonable estimate of gravitational acceleration?

A) 5 m/s²

B) 9.8 m/s²

C) 1 m/s²

D) 50 m/s²

27 / 40

Approximate mass of an eraser is:

A) 20 g

B) 20 kg

C) 2 kg

D) 2 g

28 / 40

Best estimate of length of a football field is:

A) 100 m

B) 50 m

C) 1000 m

D) 10 m

29 / 40

Approximate value of walking distance in 10 minutes is:

A) 100 m

B) 10 m

C) 1 km

D) 100 km

30 / 40

Best estimate for thickness of human hair is:

A) 1 m

B) 1 cm

C) 0.1 mm

D) 1 mm

31 / 40

Reasonable estimate of time for blinking eye is:

A) 0.1 s

B) 20 s

C) 2 s

D) 200 s

32 / 40

Best estimate of mass of a car is:

A) 100 kg

B) 10 kg

C) 10,000 kg

D) 1000 kg

33 / 40

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

34 / 40

Best estimate of length of a pencil is:

A) 2 cm

B) 1 m

C) 5 m

D) 15 cm

35 / 40

Which estimation is most reasonable for classroom window height?

A) 0.5 m

B) 50 m

C) 10 m

D) 1 - 2 m

36 / 40

Best estimate of mass of a watermelon is:

A) 50 kg

B) 0.5 kg

C) 5 kg

D) 500 kg

37 / 40

Approximate time for one day is:

A) 12 h

B) 60 min

C) 24 h

D) 60 s

38 / 40

Best estimate of thickness of steel wire is:

A) 1 cm

B) 0.1 mm

C) 10 cm

D) 1 mm

39 / 40

Which is most reasonable estimate of classroom fan speed perception?

A) 100 m/s

B) 1 m/s

C) 10 m/s

D) 0 m/s

40 / 40

Best estimate of height of a table is:

A) 10 cm

B) 20 m

C) 5 m

D) 50 - 80 cm

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