Ch.10: Electricity - Pre-Mock Exam Points

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What is density defined as?

Volume per unit mass

Weight per unit length

Mass per unit area

Mass per unit volume (correct)

Which factor affects the density of an object if the volume remains the same?

Shape of the object

Temperature

Mass of the object (correct)

Material composition

How does the density of an object change when its mass increases?

Density becomes zero

Density remains constant

Density decreases

Density increases (correct)

In the context of irregular solids, how is the volume calculated?

By subtracting two volume readings from a measuring cylinder Signup and view all the answers

Which precaution is taken to prevent parallax error when measuring liquid volume?

Looking perpendicular to the scale Signup and view all the answers

What is the relationship between mass and density for the same material?

As mass increases, density increases Signup and view all the answers

What is the SI unit for measuring speed?

Meter per second (m/s) Signup and view all the answers

What symbol represents acceleration?

a Signup and view all the answers

What does a negative acceleration value indicate?

The object is slowing down Signup and view all the answers

What does a speed-time graph with a horizontal line represent?

Constant velocity Signup and view all the answers

What is the SI unit for measuring force?

Newton (N) Signup and view all the answers

What is the combined effect of several forces called?

Resultant force Signup and view all the answers

What is the unit for measuring current?

Ampere Signup and view all the answers

Which instrument is used to measure current in a circuit?

Ammeter Signup and view all the answers

When an object gains electrons, what type of charge does it acquire?

Negative Signup and view all the answers

What happens to the resistance of a wire if its length increases?

Resistance increases Signup and view all the answers

Which component is connected in series to measure current in a circuit?

Ammeter Signup and view all the answers

What type of current flows in only one direction at a constant value?

Direct current Signup and view all the answers

What happens when a magnetic substance is placed near a south pole?

A north pole is induced on the magnetic substance Signup and view all the answers

How can de-magnetization be achieved for a magnet?

Heating till red hot Signup and view all the answers

What happens to the strength of the magnetic field as the current passing through a wire increases?

The strength of the field increases Signup and view all the answers

What effect does placing a piece of steel inside a wire coil have on the magnetism?

Strengthens the magnetism of the coil and steel Signup and view all the answers

Why does a piece of steel retain some magnetism even after the current is switched off?

Because steel is magnetically hard Signup and view all the answers

What happens when a piece of iron is placed inside a wire coil?

It makes an even stronger magnet when current is switched on Signup and view all the answers

What causes the Earth to have day and night?

Earth's rotation around its own axis Signup and view all the answers

Which factor can make an electromagnet stronger?

Increasing the number of turns on the coil Signup and view all the answers

What motion of the Earth causes the creation of different seasons?

Earth's axial tilt towards and away from the Sun Signup and view all the answers

Why does the Moon appear to change shape?

Movement around the Earth Signup and view all the answers

How can an electromagnet's polarity be reversed?

Reversing the battery to change the current direction Signup and view all the answers

What is responsible for creating day and night on Earth?