A chips wrapper is 4.5 cm long and 5.9 cm wide. Its area up to significant figures will be:

Solution

The area is calculated as \(4.5 \, \text{cm} \times 5.9 \, \text{cm} = 26.55 \, \text{cm}^2\). Considering significant figures, the answer is \(26.55 \, \text{cm}^2\).

A worldwide system of measurements in which the units of base quantities were introduced is called:

Solution

The International System of Units (SI) is the standard metric system used worldwide.

All accurately known digits and first doubtful digit in an expression are known as:

Solution

These are known as significant figures.

If zero line of Vernier scale coincides with zero of main scale, then zero error is:

Solution

If the zero lines coincide, the zero error is zero.

Zero error of the instrument is:

Solution

Zero error is a type of systematic error.

Length, mass, electric current, time, intensity of light and amount of substance are examples of:

Solution

These are examples of base quantities in the SI system.

What is the primary focus of physics?

Solution

Physics focuses on the study of matter, its properties, and its interaction with energy.

Physicists are primarily classified into which two categories?

Solution

Physicists are classified into theoretical and experimental categories.

Which of these is a base (fundamental) quantity?

Solution

Length is a base quantity.

The standard unit of mass is measured using a:

Solution

A physical balance is used to measure mass.

Which instrument measures the volume of a liquid?

Solution

A measuring cylinder is used to measure the volume of a liquid.

To find the volume of an irregular object, you use:

Solution

The water displacement method is used to find the volume of an irregular object.

The SI unit of temperature is:

Solution

The SI unit of temperature is Kelvin.

Which prefix represents \(10^{-3}\)?

Solution

The prefix "Milli" represents \(10^{-3}\).

Density is calculated as:

Solution

Density is calculated as mass divided by volume.

Which is NOT a base quantity?

Solution

Force is not a base quantity; it is a derived quantity.

The standard unit of time is:

Solution

The standard unit of time is the second.

Which branch of Physics focuses on the laws of motion and gravitation?

Solution

Mechanics focuses on the laws of motion and gravitation.

Which branch deals with heat, temperature, and their relation to energy?

Solution

Thermodynamics deals with heat, temperature, and their relation to energy.

Which branch studies the composition and properties of atoms?

Solution

Atomic Physics studies the composition and properties of atoms.

The study of ionized matter falls under:

Solution

Plasma Physics studies ionized matter.

Which branch of Physics investigates celestial objects using physical laws?

Solution

Astrophysics investigates celestial objects using physical laws.

What does Nuclear Physics primarily study?

Solution

Nuclear Physics primarily studies the behavior of atomic nuclei.

Which field focuses on the production and properties of sound waves?

Solution

The field of Sound focuses on the production and properties of sound waves.

Geo physics is concerned with:

Solution

Geophysics is concerned with Earth’s internal structure.

Optics primarily explores:

Solution

Optics primarily explores the physical aspects of light.

Which is a fundamental physical quantity?

Solution

Mass is a fundamental physical quantity.

The SI unit of luminous intensity is:

Solution

The SI unit of luminous intensity is Candela.

Which instrument measures dimensions smaller than a Vernier Caliper?

Solution

A Micrometer screw gauge measures dimensions smaller than a Vernier Caliper.

What is the least count of a digital stopwatch?

Solution

The least count of a digital stopwatch is 0.01 second.

The kilogram prototype is made of:

Solution

The kilogram prototype is made of Platinum-iridium.

Which is a unit-less physical quantity?

Solution

Plane angle is a unit-less physical quantity.

The second is defined using vibrations of which atom?

Solution

The second is defined using vibrations of the Cesium-133 atom.

Convert 2 hours into seconds.

Solution

2 hours is equal to 7200 seconds.

Which instrument uses light gates to reduce measurement errors?

Solution

A Digital timer uses light gates to reduce measurement errors.

The least count of an instrument refers to its:

Solution

The least count of an instrument refers to its smallest measurable value.

Which derived quantity has the unit kg/m³?

Solution

Density has the unit kg/m³.

What is the primary purpose of using prefixes in the SI system?

Solution

The primary purpose of using prefixes in the SI system is to express very large or small quantities conveniently.

Which prefix represents a multiplier of \(10^9\)?

Solution

The prefix "Giga" represents a multiplier of \(10^9\).

Arrange these prefixes from LARGEST to SMALLEST: 1. Mega 2. Kilo 3. Tera 4. Giga

Solution

The correct order is 3 (Tera), 4 (Giga), 1 (Mega), 2 (Kilo).

The prefix "femto" represents:

Solution

The prefix "femto" represents \(10^{-15}\).

Which prefix is used for "hundred" (\(10^2\))?

Solution

The prefix "Hecto" is used for "hundred" (\(10^2\)).

What is the exponential form of the prefix "pico"?

Solution

The exponential form of the prefix "pico" is \(10^{-12}\).

Which of these is NOT an SI prefix for values greater than 1?

Solution

"Deci" is not an SI prefix for values greater than 1.

What is the primary purpose of scientific notation?

Solution

The primary purpose of scientific notation is to simplify calculations with very large or small numbers.

The coefficient in scientific notation must always be:

Solution

The coefficient in scientific notation must always be equal to or greater than 1.

What is the base value in scientific notation?

Solution

The base value in scientific notation is 10.

Which statement about the exponent in scientific notation is correct?

Solution

The exponent in scientific notation can be positive or negative.

Why does an iron needle sink while wood floats?

Solution

An iron needle sinks while wood floats because iron is denser than wood.

What is the SI unit of density?

Solution

The SI unit of density is kg/m³.

Convert 2.70 g/cm³ to kg/m³.

Solution

2.70 g/cm³ is equal to 2700 kg/m³.

Relative density is another term for:

Solution

Relative density is another term for specific gravity.

To avoid parallax error, read a measuring cylinder by aligning your eye with:

Solution

To avoid parallax error, read a measuring cylinder by aligning your eye with the bottom of the meniscus.

Density is defined as:

Solution

Density is defined as mass per unit volume.

1 m³ equals how many liters?

Solution

1 m³ equals 1000 liters.

How many significant figures does 0.00000034 have?

Solution

0.00000034 has 2 significant figures.

How many significant figures does 2045 have?

Solution

2045 has 4 significant figures.

How many significant figures are in 2.00?

Solution

2.00 has 3 significant figures.

What is the count of significant figures in 200?

Solution

200 has 1 significant figure.