7th Class Science Electricity and Zoology

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What is the purpose of a device in a circuit?

It increases the voltage in the circuit

It prevents large flow of current through a circuit (correct)

It connects the circuit components

It is a source of electricity

What is the SI unit for electric current?

volt

ampere (correct)

milli ampere

micro ampere

What is true about angiosperms?

They are non-vascular plants

They are non-vascular plants bearing flowers

They are vascular plants bearing flowers (correct)

They are plants without flowers

What is true about diffusion?

It is the process of particles moving from higher to lower concentration Signup and view all the answers

What is true about natural gas?

It is a non-renewable energy resource Signup and view all the answers

What happens when you add a light bulb to a series circuit?

Total resistance increases Signup and view all the answers

What is the source of energy used to produce electricity in hydroelectric power stations?

Water Signup and view all the answers

What happens to the resistance in a parallel circuit when more resistors are added?

It decreases Signup and view all the answers

How does the current flowing through each branch in a parallel circuit compare to the current flowing out from the source?

It is less than Signup and view all the answers

How are animals classified?

As vertebrates and invertebrates Signup and view all the answers

What is the characteristic of the class of invertebrates that includes arthropods?

Segmented body Signup and view all the answers

What is an example of an arthropod?

Crab Signup and view all the answers

What is the primary reason why solids cannot diffuse?

Because of the rigid arrangement of particles Signup and view all the answers

Why do gases generally have lower densities than liquids?

Because gas particles are farther apart Signup and view all the answers

What happens when a liquid is cooled?

It becomes a solid Signup and view all the answers

What is the element represented by the symbol 16S?

Sulfur Signup and view all the answers

What is the atomic number of the element Sulfur?

16 Signup and view all the answers

How many protons and electrons are present in a neutral atom of Sulfur?

16 protons, 16 electrons Signup and view all the answers

What is the function of component X in the electric circuit?

To provide a path for the flow of electrons Signup and view all the answers

Which direction do electrons flow in a circuit?

From negative to positive terminal Signup and view all the answers

Why may component X be useful in the electrical circuit?

To provide a path for the flow of electrons Signup and view all the answers

What can be concluded from the ammeter readings in a series circuit?

The current is the same at each point Signup and view all the answers

What is the function of component Y in the electric circuit?

To convert electrical energy to light energy Signup and view all the answers

What is wrong with the ammeter in the electric circuit?

It is connected in parallel to the circuit Signup and view all the answers

What is an advantage of using wind to generate electricity?

It produces no noise Signup and view all the answers

What is a disadvantage of using a wind generator to charge a battery?

It is expensive to maintain Signup and view all the answers

What is a disadvantage of using solar energy to generate electricity?

It is expensive to install Signup and view all the answers

What are two disadvantages of burning fossil fuels?

They produce pollution and contribute to climate change Signup and view all the answers

What is the main difference between renewable and non-renewable energy resources?

Renewable resources are sustainable, non-renewable resources are not Signup and view all the answers

What is ethanol, and where does it come from?

Ethanol is a renewable energy source and comes from plants Signup and view all the answers