A

Measurements - One Word Answers | Class 9 Physics

Class 9 Physics: One-Word/Term Answers on Measurements

1. A quantity that cannot be expressed in terms of other physical quantities.
Fundamental Quantity
2. The SI unit of time.
Second
3. A quantity obtained by multiplying or dividing fundamental quantities.
Derived Quantity
4. The smallest value that can be measured by a vernier callipers.
Least Count
5. Instrument used to measure the diameter of a small spherical object like a ball bearing.
Screw Gauge
6. The part of a screw gauge that advances forward on rotating the screw head.
Spindle
7. The formula to find the least count of a screw gauge.
Pitch ÷ No. of divisions on circular scale
8. The time for one complete oscillation of a pendulum.
Time Period
9. The formula to find time period of a simple pendulum.
T = 2π√(l/g)
10. The SI unit of length.
Metre

How many did you get right?

Tell us in the comments — and keep practicing!

Learning Physics is fun when it's interactive!

Comments

Post a Comment

Popular posts from this blog

Syllabus

IIT Foundation Physics Syllabus for Class 8 to 10 IIT Foundation Course – Physics Syllabus (Class 8 to 10) Designed For: Early preparation for JEE & Science Olympiads Goal: Strengthen concepts, improve problem-solving, and build a competitive edge from middle school. Class 8 – Concept Building Stage Physical Quantities & Measurements Motion and Graphical Representation Force & Pressure Friction Sound – Basics and Echo Light – Rectilinear Propagation and Reflection Heat – Temperature, Transfer of Heat Electricity – Introduction to Electric Circuits Class 9 – Strengthening Foundations Motion in One Dimension Newton's Laws of Motion Gravitation and Archimedes’ Principle Work, Power, Energy & Conservation Detailed Study of Sound Waves Light – Reflection and Refraction Heat & Basic Thermodynamics ...
Read more
Barometer – Questions & Answers 📘 Barometer – Short and Long Answer Type Questions 1. What is atmospheric pressure? Show Answer Atmospheric pressure is the pressure exerted by the weight of the air in the Earth's atmosphere on objects on Earth. 2. Why don’t we feel the atmospheric pressure acting on us? Show Answer We don't feel it because the pressure inside our body balances the atmospheric pressure from outside. 3. Describe an experiment to show that air exerts pressure. Show Answer Take an empty can and heat it with some water inside. When steam comes out, close the lid tightly and cool it. The can collapses due to air pressure. 4(i). Why does a balloon collapse when air is removed? Show Answer When air is removed from the balloon, the external atmospheric pressure crushes it as no air is left inside to balance it. 5. Why does liquid rise in a syringe when its piston is pulled up? Show Answer ...
Read more
Torricelli’s Barometer – Introduction and Puzzles 🌡️ Torricelli’s Barometer The **barometer** is a device used to measure **atmospheric pressure**. It was invented by the Italian scientist **Evangelista Torricelli** in 1643. Torricelli used a long glass tube filled with **mercury**, sealed at one end, and inverted into a dish of mercury. The mercury in the tube fell slightly, leaving a **vacuum** at the top now known as the Torricellian vacuum . The height of the mercury column (usually around 76 cm at sea level) indicates the atmospheric pressure. This simple yet brilliant invention proved that air has weight and exerts pressure. The barometer not only helps us understand pressure but also plays an important role in predicting **weather conditions**. 🧠 Puzzles on Torricelli’s Barometer 1. Who invented the barometer? Evangelista Torricelli Galileo Galilei Hint: He ...
Read more