Class 9th PHYSICS: PHYSICAL QUANTITIES and MEASUREMENTS 01

Physical sciences were divided into

• 4 disciplines

• 3 disciplines

• 5 disciplines

• 6 disciplines

The smallest change a sensitive beam balance can record is

• 100 mg

• 10 mg

• 50 mg

• 1 mg

By using prefixes, we can write 335 × 10^-8 s as

• 0.335 µs

• 33.5 µ

• 335 µs

• 3.35 µs

When a standard is set for a quantity, then the standard quantity is called a

• amount

• rate

• prefix

• unit

The study of the internal structure of the Earth is known as

• mechanics

• nuclear physics

• atomic physics

• geophysics

The words or letters added before a unit and stand for the multiples or sub-multiples of that unit are called

• mass

• prefixes

• units

• rate

The least count of Vernier calipers is

• 0.01 mm

• 0.1 mm

• 0.01 cm

• 1 cm

The least count of the vernier calliper is

• 1 mm

• 0.5 mm

• 0.1 mm

• 0.001 mm

The “seconds in a day” can be written in standard form as

• 864 × 10⁵ s

• 86.4 × 10⁵ s

• 8640 × 10⁵ s

• 8.64 × 10⁵ s

A chips wrapper is 4.5 cm long and 5.9 cm wide. Its area upto significant figures will be

• 30 cm²

• 28 cm²

• 26.55 cm²

• 32 cm²