2 To measure the volume of a liquid accurately, which piece of apparatus is most suitable? A Beaker B Measuring cylinder C Test tube D Conical flask
3 What should be done before using a balance in an experiment? A Calibrate it and set it to zero B Fill it with water C Heat it strongly D Shake it well
4 To reduce parallax error while reading a burette, the eye should be: A Above the meniscus B Below the meniscus C At the same level as the meniscus D Far away from the burette
5 Percentage error is calculated as: A (Error / True value) × 100 B (True value / Error) × 100 C (Error × True value) / 100 D Error + True value
6 Why is it important to calibrate a thermometer before use? A To make it look new B To ensure accurate readings C To change its scale D To increase its range
7 To reduce parallax error while reading a measuring cylinder, the eye should be: A above the meniscus B below the meniscus C level with the meniscus D far away from the cylinder
8 Which tool is most suitable for measuring the volume of a liquid accurately in a school laboratory? A Burette B Beaker C Test tube D Conical flask
9 A random error is best reduced by: A Using a faulty instrument B Taking a single reading quickly C Repeating measurements and averaging the results D Ignoring the smallest scale division
10 Which of the following is a systematic error? A A balance that always reads 0.5 g too high B A student reading a scale slightly differently each time C Bubbles forming randomly in a liquid D Small changes in room temperature during the experiment
11 Which statement defines precision? A How close repeated measurements are to each other B How close a measurement is to the true value C How costly the instrument is D How quickly the measurement is taken
12 What is the main advantage of taking repeated measurements in an experiment? A It reduces the effect of random errors B It removes all systematic errors C It makes the instrument more expensive D It changes the true value
13 Which practice helps to reduce parallax error while reading a thermometer? A Reading with the eye directly in line with the scale B Reading from a distance C Reading at an angle D Reading while the thermometer is moving
14 What is the main purpose of calibrating a thermometer? A To change its size B To make it look shiny C To ensure accurate readings D To increase its weight
15 A student records the following readings: 5.1 g, 5.2 g, 5.0 g. The true value is 5.1 g. Which statement is correct? A The readings are precise but not accurate B The readings are accurate but not precise C The readings are both accurate and precise D The readings are neither accurate nor precise
16 A systematic error is one that: A Is different in size and direction for every reading B Is always in the same direction and affects all readings equally C Can be removed only by taking an average D Is caused only by the observer's eye level
17 What is meant by calibration of a measuring instrument? A Checking and adjusting the instrument against a known standard B Cleaning the instrument with water C Reading the instrument from any angle D Using the instrument without checking
18 Random errors are caused by: A Faulty apparatus B Unpredictable variations C Wrong calibration D Wrong method
20 Which SI base unit is used for the amount of substance? A Kelvin (K) B Mole (mol) C Candela (cd) D Ampere (A)
21 Which technique is used to reduce parallax error when reading a burette? A Reading from above the meniscus B Keeping the eye level with the meniscus C Shaking the burette before reading D Using a thermometer to measure the liquid
22 When measuring the volume of a liquid with a measuring cylinder, the most appropriate choice depends mainly on the: A Colour of the liquid B Required precision and volume range C Temperature of the room D Shape of the test tube rack
23 Which of the following is an example of a systematic error? A Zero error in a measuring instrument B Random fluctuation in reading a thermometer C Parallax error while reading a burette D Variation due to environmental conditions
24 Which of the following best explains why significant figures are used in measurements? A To show the uncertainty in the last digit B To make numbers look longer C To hide errors in measurement D To change the unit of the measurement
25 A student measures the mass of a sample three times and gets 10.2 g, 10.3 g, and 10.1 g. The true mass is 10.5 g. What can be said about the measurements? A They are precise but not accurate. B They are accurate but not precise. C They are both accurate and precise. D They are neither accurate nor precise.