Physics Important Questions Sindh Board 2023

5. A chips wrapper is 4.5 cm long and 5.9 cm wide. Its area upto significant

figures will be:

a) 30 cm2

b) 28 cm2

c) 26.55 cm2✓

d) 32 cm2

6. A worldwide system of measurements in which the units of base

quantities were introduced is called:

a) prefixes

b) international system of units ✓

c) hexadecimal system

d) none of above

7. All accurately known digits and first doubtful digit in an expression are known as:

a) non-significant figures

b) significant figures ✓

c) estimated figures

d) crossed figures

8. If zero line of Vernier scale coincides with zero of main scale, then zero error is:

a) positive

b) zero ✓

c) negative

d) one

9. zero error of the instrument is:

a) systematic error ✓

b) human error

c) random error

d) classified error

10. Length, mass, electric current, time, intensity of light and amount of substance are examples of:

a) base quantities ✓

b) derived quantities

c) prefixes

d) quartile quantities

11. Physics is the branch of science which observes the nature represents it mathematically and conclude with the:

(a) observation

(b) calculation

(c) experiment ✓

(d) all of them

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