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

A. Newton

B. Joule

C. Kelvin

D. Watt

A student uses a vernier calliper to measure the diameter of a small ball. Which of the following best describes the calibration of the instrument?

A. Adjusting the zero error of the caliper

B. Increasing the range of measurement

C. Changing the unit of measurement

D. Enhancing the precision of the caliper

Which of the following is NOT a derived unit?

A. Pascal

B. Hertz

C. Metre

D. Volt

A scientist uses a barometer to measure atmospheric pressure. What type of instrument is a barometer?

A. Optical instrument

B. Pressure instrument

C. Temperature instrument

D. Length instrument

Which of the following instruments would be best suited for measuring the volume of a liquid?

A. Ammeter

B. Graduated cylinder

C. Stopwatch

D. Micrometer screw gauge

a) Define the term "base unit" in the context of the International System of Units (SI). [2]

b) List and briefly describe the seven base units in the SI system. [7]

a) Differentiate between derived units and base units in the context of measurements in physics. [3]

b) Calculate the unit of force in the SI system using the base units. [4]

a) Explain the importance of calibrating measuring instruments in physics experiments. [3]

b) A student uses a metre ruler that starts from 2mm instead of 0mm due to wear and tear. If the student measures a length as 50mm using this ruler, what is the actual length of the object? [4]

a) What is the significance of the SI system in scientific measurements? [3]

b) Name three derived units and the base units from which they are derived. [3]

c) If a thermometer reads 102°C during boiling water's measurement but is supposed to read 100°C, how should the readings be corrected for future measurements? [4]

a) Define scalar and vector quantities, giving two examples of each. [4]

b) If two vectors of magnitudes 5 units and 12 units are added, what are the maximum and minimum possible resultant magnitudes? [4]

c) Describe the process of calibrating a spring balance. [2]

The unit "Watt" is derived from which basic SI units?

A. Kilogram, meter, and second

B. Metre, second, and Kelvin

C. Kilogram, meter, second, and Ampere

D. Kilogram, metre, and Kelvin

Which of the following best describes the difference between base units and derived units?

A. Base units are more complex than derived units

B. Derived units are combinations of base units

C. Base units can be converted into derived units

D. Derived units are fundamental, while base units are not

A student uses a thermometer to measure the temperature of a solution. Before taking the measurement, she ensures the thermometer reads 0°C in melting ice. This process is known as:

A. Calibration

B. Verification

C. Validation

D. Standardisation

Which of the following is NOT a base unit in the SI system?

A. Second

B. Mole

C. Ampere

D. Newton

If a scientist wants to measure the current flowing through a circuit, which instrument should he use?

A. Voltmeter

B. Ammeter

C. Barometer

D. Manometer

a) Why is it essential to use appropriate measuring instruments in physics experiments? [3]

b) A student uses a 30cm ruler to measure a rod and finds it to be 27cm. If the actual length of the rod is 28cm, calculate the percentage error in the student's measurement. [3]

c) Explain the difference between systematic and random errors, providing an example for each. [4]

a) Describe the principle behind the operation of a vernier calliper. [3]

b) If a vector has a magnitude of 10 units and makes an angle of 30° with the horizontal, calculate its horizontal component. [3]

c) How does calibration help in minimising systematic errors? [4]

a) Define the term 'derived unit' and provide two examples. [3]

b) A car travels a distance of 120 km in 2 hours. Calculate its average speed. [2]

c) Explain the difference between precision and accuracy in measurements. [3]

d) A student uses a measuring tape that has stretched and gives readings 5% greater than the actual length. If he measures a room to be 20m long using this tape, what is the actual length of the room? [2]

a) What is the importance of base units in the SI system? [3]

b) If two vectors A and B have magnitudes of 5 units and 7 units, respectively and are at an angle of 60° to each other, calculate the resultant vector's magnitude. [3]

c) Describe the process of calibrating a digital weighing scale. [3]

d) Why is it essential to consider uncertainties in physics experiments? [3]

a) What is the difference between a scalar and a vector quantity? Provide one example for each. [3]

b) A plane flies 300 km North and then 400 km East. Calculate the resultant displacement of the plane. [3]

c) How does the choice of instruments affect the accuracy of measurements? [3]

d) If a pendulum's time period is measured as 2.05 seconds with an uncertainty of ±0.02 seconds, calculate the percentage uncertainty. [2]