7th Class Science Electricity and Zoology
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Questions and Answers

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?

<p>It is the process of particles moving from higher to lower concentration (D)</p> Signup and view all the answers

What is true about natural gas?

<p>It is a non-renewable energy resource (D)</p> Signup and view all the answers

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

<p>Total resistance increases (A)</p> Signup and view all the answers

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

<p>Water (C)</p> Signup and view all the answers

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

<p>It decreases (C)</p> 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?

<p>It is less than (A)</p> Signup and view all the answers

How are animals classified?

<p>As vertebrates and invertebrates (B)</p> Signup and view all the answers

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

<p>Segmented body (A)</p> Signup and view all the answers

What is an example of an arthropod?

<p>Crab (A)</p> Signup and view all the answers

What is the primary reason why solids cannot diffuse?

<p>Because of the rigid arrangement of particles (B)</p> Signup and view all the answers

Why do gases generally have lower densities than liquids?

<p>Because gas particles are farther apart (A)</p> Signup and view all the answers

What happens when a liquid is cooled?

<p>It becomes a solid (A)</p> Signup and view all the answers

What is the element represented by the symbol 16S?

<p>Sulfur (D)</p> Signup and view all the answers

What is the atomic number of the element Sulfur?

<p>16 (A)</p> Signup and view all the answers

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

<p>16 protons, 16 electrons (B)</p> Signup and view all the answers

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

<p>To provide a path for the flow of electrons (D)</p> Signup and view all the answers

Which direction do electrons flow in a circuit?

<p>From negative to positive terminal (D)</p> Signup and view all the answers

Why may component X be useful in the electrical circuit?

<p>To provide a path for the flow of electrons (B)</p> Signup and view all the answers

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

<p>The current is the same at each point (B)</p> Signup and view all the answers

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

<p>To convert electrical energy to light energy (D)</p> Signup and view all the answers

What is wrong with the ammeter in the electric circuit?

<p>It is connected in parallel to the circuit (C)</p> Signup and view all the answers

What is an advantage of using wind to generate electricity?

<p>It produces no noise (B)</p> Signup and view all the answers

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

<p>It is expensive to maintain (D)</p> Signup and view all the answers

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

<p>It is expensive to install (C)</p> Signup and view all the answers

What are two disadvantages of burning fossil fuels?

<p>They produce pollution and contribute to climate change (A)</p> Signup and view all the answers

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

<p>Renewable resources are sustainable, non-renewable resources are not (A)</p> Signup and view all the answers

What is ethanol, and where does it come from?

<p>Ethanol is a renewable energy source and comes from plants (A)</p> Signup and view all the answers

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