Physical quantities and measurement

Which of these is a base quantity in the SI system?

• 1 Length
• 2 Force
• 3 Area
• 4 Speed

What is the SI unit of time?

• 1 Minute
• 2 Day
• 3 Second
• 4 Hour

The least count of a metre rule is:

• 1 1 m
• 2 1 mm
• 3 1 cm
• 4 0.1 mm

The least count of a vernier calliper is usually:

• 1 1 cm
• 2 0.01 cm
• 3 0.001 cm
• 4 0.1 cm

What is 5 kilometres expressed in metres?

• 1 50 m
• 2 50000 m
• 3 5000 m
• 4 500 m

A screw gauge is mainly used to measure:

• 1 Time
• 2 The temperature of a body
• 3 Very small thickness or diameter, such as a wire
• 4 The mass of a body

The SI unit of mass is the:

• 1 Newton
• 2 Kilogram
• 3 Gram
• 4 Tonne

The SI prefix 'milli' means:

• 1 10³
• 2 10⁶
• 3 10⁻³
• 4 10⁻⁶

A stopwatch is used to measure:

• 1 Length
• 2 Time interval
• 3 Temperature
• 4 Mass

Which of these is a scalar quantity?

• 1 Mass
• 2 Displacement
• 3 Velocity
• 4 Force

Which of these is a base quantity?

• 1 Force
• 2 Area
• 3 Electric current
• 4 Speed

The SI unit of temperature is the:

• 1 kelvin
• 2 degree Fahrenheit
• 3 degree Celsius
• 4 calorie

The prefix kilo stands for:

• 1 10⁶
• 2 10⁻³
• 3 10³
• 4 10²

The prefix nano stands for:

• 1 10⁹
• 2 10⁻³
• 3 10⁻⁶
• 4 10⁻⁹

The least count of a screw gauge is found from:

• 1 Pitch × number of divisions
• 2 Pitch ÷ number of circular scale divisions
• 3 Number of divisions ÷ pitch
• 4 Length of the screw

A vernier calipers has a positive zero error of 0.02 cm. A measured reading of 3.46 cm is corrected to:

• 1 3.48 cm
• 2 3.44 cm
• 3 3.50 cm
• 4 3.46 cm

How many significant figures are in 0.00340?

• 1 5
• 2 6
• 3 2
• 4 3

Repeating a measurement several times and taking the mean mainly reduces:

• 1 Random error
• 2 The least count
• 3 The unit of the quantity
• 4 Zero error

A set of readings that are close to each other but far from the true value is:

• 1 Accurate and precise at the same time
• 2 Not precise and not accurate
• 3 Accurate but not precise
• 4 Precise but not accurate

2500 m written in scientific notation is:

• 1 2.5 × 10⁻³ m
• 2 0.25 × 10⁴ m
• 3 2.5 × 10³ m
• 4 25 × 10² m