PPSC Physics Chapter 6 Electricity and Magnetism With Answers

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PPSC Physics Chapter 6 Electricity and Magnetism

Sr. # Questions Answers Choice
1 An ideal voltage source has zero. Current Electromotive force Voltage Internal resistance
2 The conductivity of a conductor is independent of the Electric charge Electric potential Electric field Internal resistance
3 Current per unit area is called. Electric potential Current density Charge density Electric intensity
4 Which material has the larges resistivity. Silver Germinium Amber Sulphur
5 What is the term for an motion of charge from one region to another. electric charge Electric current Electric field Electric potential
6 What is used in an electric circuit to allow current in one direction only. A fuse An ammeter A diode A relay
7 Electricity is transmitted at high voltage rather than at low voltage because. It is generated at high voltage It is safer It requires less insulation It wastes less energy
8 Why should the metal casing of an electrical fire be earthen. To complete an electrical circuit. To prevent the fire from overheating To reduce the risk of electric shocks To stope the casing from getting too not to touch
9 What can be used as the unit of envery. N m-1 V A W.s V C-1
10 What does the electricity meter record. Charge Current Energy Power
11 The electric bulb does not obey Ohm's law because. Current changes Resistance changes Heat is produced All of these
12 Which of the following can be used to calculate electrical power. Current x resistance Potential difference x current Potential difference / current Potential difference /resistance
13 An Electric kettle should always be fitted with an earth connection as a protective device What is being protected by the earth connection. The cable connecting the kettle The fuse in the circuit The heating element of the kettle The person using the kettle
14 Static electricity occurs when two metals are connected to a battery Different insulators are rubbed together The weather is very humid Different conductors are rubbed together
15 The maximum field that a dielectric material can with stand whiteout breaking down is called its. Di electric strength Magnetic strength Capacity Resistance
16 Which material has the greatest di electric constant. Mylar Glass Germanium Water
17 What is a measure of the separation of positive and negative electrical charges in a system of charges. charge polarization Electric dipole moment Electric field Electrostatic induction
18 Which one fo the following is based on the diffraction and repulsion of electric charge. Capacitor motor Transformer Induction motor synchronous motor
19 The building up of electric charge on the surface of objects is termed as. Static electricity Electric charge Electric current Electrostatic induction
20 An electric lamp use energy at the rate of 46 W on a 12 V supply. How much charge passes through the lamp in 2s. 0.15 C 0.50 C 2.0 C 8.0 C
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