Phy – Chapter 1: Physical Quantities and Measurements

1

Which instrument is most suitable for measuring the thickness of a metal sheet accurately?

A Metre rule B Measuring tape C Micrometer screw gauge D Beam balance

2

Which instrument is used to measure the thickness of a small sheet?

A Metre rule B Vernier callipers C Micrometer screw gauge D Measuring tape

3

Which error can be reduced by taking repeated measurements and averaging them?

A Systematic error B Zero error C Random error D Instrumental error

4

A student measures the length of a pencil as 12.4 cm, 12.5 cm, and 12.4 cm. These measurements show:

A High accuracy but low precision B High precision but low accuracy C Both high accuracy and high precision D Neither accuracy nor precision

5

While measuring the volume of an irregular solid by the displacement method, the initial reading of water in a measuring cylinder is 20 cm³ and the final reading is 35 cm³. The volume of the solid is:

A 15 cm³ B 20 cm³ C 35 cm³ D 55 cm³

6

Which set of measurements is most precise?

A 10.1 cm, 10.2 cm, 10.3 cm B 10.0 cm, 10.5 cm, 11.0 cm C 9.5 cm, 10.0 cm, 10.5 cm D 9.0 cm, 10.0 cm, 11.0 cm

7

The zero error of a measuring instrument is a type of:

A Random error B Systematic error C Human error D Personal error

8

Which of the following is a systematic error?

A Zero error of an instrument B Random fluctuation in readings C Human error in reading D Parallax error

9

The volume of an irregular solid is found by:

A Using a metre rule B Using a beam balance C Displacement method in a measuring cylinder D Using a micrometer screw gauge

10

While measuring the volume of water in a measuring cylinder, the correct reading is taken at the:

A Top of the meniscus B Bottom of the meniscus C Middle of the cylinder D Edge of the cylinder

11

Which of the following is a base SI unit?

A Newton B Joule C Kilogram D Watt

12

The least count of a micrometer screw gauge with a pitch of 0.5 mm and 50 circular scale divisions is:

A 0.1 mm B 0.05 mm C 0.01 mm D 0.005 mm

13

The least count of a Vernier callipers is:

A 0.1 mm B 0.01 mm C 0.001 mm D 1 mm

14

To measure the mass of a body correctly with a beam balance, the body should be placed:

A On the right pan B On the left pan C On the beam D On the base

15

How many significant figures are there in the measurement 0.00450 m?

A 2 B 3 C 4 D 5

16

Which of the following is a base quantity in the International System of Units (SI)?

A Force B Length C Area D Speed

17

The degree of agreement between the measured value and the true value is called:

A Precision B Accuracy C Uncertainty D Error

18

The least count of a Vernier callipers is 0.1 mm. What is this in cm?

A 0.1 cm B 0.01 cm C 0.001 cm D 1.0 cm

19

The number 0.0056 in scientific notation is written as:

A 5.6 x 10^3 B 5.6 x 10^-3 C 56 x 10^-4 D 0.56 x 10^-2

20

ورنیئر کالیپرز کا کم سے کم پیمانہ 0.01 سینٹی میٹر ہے۔ اس سے لی گئی ایک پیمائش میں غیر یقینی پن کتنا ہے؟

A ±0.01 سینٹی میٹر B ±0.005 سینٹی میٹر C ±0.02 سینٹی میٹر D ±0.1 سینٹی میٹر

21

How many significant figures are there in the measurement 0.00560 m?

A 2 B 3 C 4 D 6

22

Which method is used to find the volume of an irregular solid?

A Formula method B Displacement method C Beam balance method D Zero error method

23

Which of the following is a derived physical quantity?

A Length B Mass C Time D Area

24

Which of the following is NOT a base quantity?

A Length B Mass C Velocity D Time

25

What is meant by uncertainty in a measurement?

A The exact value of measurement B The doubt in the measured value C The unit of measurement D The instrument used