Class 9 Physics Unit-1: Physical Quantities and Measurement, Solved MCQs With Verified Answers. (Sindh Textbook Board, Jamshoro)

1. Figure 1.26 shows part of a Vernier scale, what is the reading on the Vernier scale

(a) 6.50 cm
(b) 6.55 cm
(c) 7.00 cm
(d) 7.45 cm

... Answer is (b) 6.55 cm
6.5 cm + 5 x 0.01 cm (least count) = 6.55 cm

2. Ten identical steel balls each of mass 27gm, are immersed in a measuring cylinder having 20 cm³ of water. The reading of the water level rises to 50 cm³. What is the density of the steel?

(a) 0.90 gm/cm³
(b) 8.1 gm/cm³
(c) 9.0 gm/cm³
(d) 13.5gm/cm³

... Answer is (a) 0.90 gm/cm³
Mass = 27 g, Volume = 50 cm - 20 cm = 30 cm, Thus density = mass /volume = 27 gm / 30 cm = 0.90 gm/cm

3. An object of mass 100g is immersed in water as shown in figure 1.27, what is the density of the material from which the object is made?

(a) 0.4 gm/cm³
(b) 0.9 gm/cm³
(c) 1.1 gm/cm³
(d) 2.5 gm/cm³

... Answer is (d) 2.5 gm/cm³
Mass = 100 g, Volume = 90 cm - 50 cm = 40 cm, Thus density = mass /volume = 100 gm / 40 cm = 2.5 gm cm⁻³

4. What is the reading of this micrometer in figure 1.28

(a) 5.43 mm
(b) 6.63 mm
(c) 7.30 mm
(d) 8.13 mm

... Answer is (b) 6.63 mm
6.5 mm + 13 x 0.01 mm (least count)= 6.63 mm

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

... Answer is (c) 26.55 cm²
Solution: 4.5 cm x 5.9 cm = 26.55 cm²

6. A worldwide system of measurements in which the units of base quantities were introduced is called

(a) prefixes
(b) the international system of units
(c) hexadecimal system
(d) none of above

... Answer is (b) the international system of units
SI units

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

(a) non-significant figures
(b) significant figures
(c) estimated figures
(d) crossed figures

... Answer is (b) significant figures
Definition of significant figures

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

(a) positive
(b) zero
(c) negative
(d) one

... Answer is (b) zero
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9. Zero error of the instrument is

(a) systematic error
(b) human error
(c) random error
(d) classified error

... Answer is (a) systematic error
Instrument error is a type of systematic error.

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

(a) base quantities
(b) derived quantities
(c) prefixes
(d) quartile quantities

... Answer is (a) base quantities
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