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نویں جماعت · طبیعیات · 6 سوالات

نام: ____________________ تاریخ: ____________

Which of these is a base quantity in the SI system?
- A Length
- B Force
- C Area
- D Speed
What is the SI unit of time?
- A Minute
- B Day
- C Second
- D Hour
The least count of a metre rule is:
- A 1 m
- B 1 mm
- C 1 cm
- D 0.1 mm
The least count of a vernier calliper is usually:
- A 1 cm
- B 0.01 cm
- C 0.001 cm
- D 0.1 cm
What is 5 kilometres expressed in metres?
- A 50 m
- B 50000 m
- C 5000 m
- D 500 m
A screw gauge is mainly used to measure:
- A Time
- B The temperature of a body
- C Very small thickness or diameter, such as a wire
- D The mass of a body

جوابی کلید

1. A, 2. C, 3. B, 4. B, 5. C, 6. C

Length is one of the seven base quantities. Force, speed and area are derived from base quantities.
The second is the SI base unit of time.
A metre rule is marked in millimetres, so its least count is 1 mm.
A common vernier calliper reads to 0.01 cm, or 0.1 mm.
Kilo means 1000, so 5 km = 5 x 1000 = 5000 m.
A screw gauge measures small lengths such as the diameter of a thin wire with high precision.