B. Fill in the blanks.
1. Matter is made of tiny partides called c om
2. When an atom loses electrons, it acquires a net u charge
3. An electroscope can be used to test whether a body is a qu o r not
4. When a positively charged body is brought near a conductor, it induces a
charge on the near end of the conductor.
5. A lightning conductor is a long rod made of either
6. In an electric circuit, the
wire carries all the current.
7. The bigger hole in a socket called
saves us from getting electr
8. An electric meter measures the amount of electricity consumed in units of
9. The flow of large amount of current through a circuit due to the contact betwee
neutral wire is called
than the melting point of th
10. The melting point of a fuse wire is
C. Write true or false. Correct the false statements.
Answers
Answer:
1.atoms
2.positive charge
1: Matter on Earth is in the form of solid, liquid, or gas. Solids, liquids, and gases are made of tiny particles called atoms and molecules.
2: Although both of these ions have higher charges than the ions in lithium bromide, ... 4 Li + O2 --> 2 Li2O ( 2Li+ O2-) Overall 4 Li atoms lose 1 electron each and two ... but has not been convincingly linked to clinically apparent acute liver injury.
3: If a charged body (for example, ebonite rod) is touched to the metal disc of the gold-leaf electroscope, the metal strips of the electroscope gets charged by conduction. They repel each other and open up. In this way, we can detect whether an object is charged or not
4: A charged body is brought near a positively charged gold leaf electroscopes. The divergence of its leaves increases. What is the kind of charge on the body?
5: The main attribute common to all lightning rods is that they are all made of conductive materials, such as copper and aluminum. Copper and its alloys are the most common materials used in lightning protection.
7: By Putting a screwdriver anywhere near the holes on a mains wall socket, one might get a shock of life from the electricity! Before we ...
9: This is known as the heating effect of current. ... Magnetic Effect of current: When an electric current flows through a wire, ... Physics Class 7 Electric Currents Circuit With Compass
10: The material used for fuse elements must be of low melting point, low ohmic loss, high conductivity (or low resistivity), low cost and free from detraction.
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