Measurement Physics Quiz.

Question 1. : What is the principle of a digital multimeter (DMM)?

A) It uses a needle to indicate the measurement on a dial

B) It uses an analog-to-digital converter (ADC) to convert the measurement to a digital display

C) It measures only DC voltage

D) It cannot measure resistance

Question 2. What is the SI unit of resistance?

A) Ohm

B) Volt

C) Ampere

D) Farad

Question 3. What is the SI unit of frequency?

A) Hertz

B) Newton

C) Pascal

D) Joule

Question 4. What is the difference between precision and accuracy in measurements?

A) Precision refers to how close a measurement is to the true value, while accuracy refers to how consistent a set of measurements are.

B) Precision refers to how consistent a set of measurements are, while accuracy refers to how close a measurement is to the true value.

C) Precision and accuracy are the same thing.

D) None of the above.

Question 5. What is the formula for calculating power in an electrical circuit?

A) P = VI

B) P = I^2R

C) P = V^2/R

D) All of the above

Question 6. What is the principle of a Wheatstone bridge?

A) It is used to measure resistance by comparing an unknown resistance to a known resistance.

B) It is used to measure voltage by comparing two voltage sources.

C) It is used to measure current by using a magnetic field.

D) It is used to measure capacitance by comparing two capacitors.

Question 7. What is the unit of pressure?

A) Pascal

B) Newton

C) Joule

D) Watt

Question 8. What is the principle of a thermocouple?

A) It is used to measure temperature by converting temperature into an electrical signal.

B) It is used to measure pressure by converting pressure into an electrical signal.

C) It is used to measure voltage by comparing two voltage sources.

D) It is used to measure resistance by comparing an unknown resistance to a known resistance.

Question 9. What is the principle of a strain gauge?

A) It is used to measure pressure by converting pressure into an electrical signal.

B) It is used to measure temperature by converting temperature into an electrical signal.

C) It is used to measure weight by measuring the strain in a material.

D) It is used to measure resistance by comparing an unknown resistance to a known resistance.

Answer: C) It is used to measure weight by measuring the strain in a material.

Question 10. What is the principle of a Hall effect sensor?

A) It is used to measure pressure by converting pressure into an electrical signal.

B) It is used to measure temperature by converting temperature into an electrical signal.

C) It is used to measure magnetic fields by converting the magnetic field into an electrical signal.

D) It is used to measure weight by measuring the strain in a material.

Question 11. What is the SI unit of luminous intensity?

A) Candela

B) Lux

C) Lumen

D) Watt