PPSC Physics Full Book With Answers

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PPSC Physics Full Book

Sr. # Questions Answers Choice
1 Which material has the larges resistivity. Silver Germinium Amber Sulphur
2 What is the term for an motion of charge from one region to another. electric charge Electric current Electric field Electric potential
3 What is used in an electric circuit to allow current in one direction only. A fuse An ammeter A diode A relay
4 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
5 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
6 What can be used as the unit of envery. N m-1 V A W.s V C-1
7 What does the electricity meter record. Charge Current Energy Power
8 The electric bulb does not obey Ohm's law because. Current changes Resistance changes Heat is produced All of these
9 Which of the following can be used to calculate electrical power. Current x resistance Potential difference x current Potential difference / current Potential difference /resistance
10 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
11 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
12 The maximum field that a dielectric material can with stand whiteout breaking down is called its. Di electric strength Magnetic strength Capacity Resistance
13 Which material has the greatest di electric constant. Mylar Glass Germanium Water
14 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
15 Which one fo the following is based on the diffraction and repulsion of electric charge. Capacitor motor Transformer Induction motor synchronous motor
16 The building up of electric charge on the surface of objects is termed as. Static electricity Electric charge Electric current Electrostatic induction
17 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
18 A plug connoted to a table lamp contains a 3 A fuse Why is the fuse needed. To increase the resistance of the circuit To make it easier for the current to flow To protect the wiring form overheating To reduce the voltage across thelamp
19 The terminals of a battery are joined by a length of resistance wire Which change on its own will increase the current though the battery. Connecting the wire with plastic insulation Covering the wire with plastic insulation Using a shorter wire of the same material and the same thickness Using a thinner wire of the same material and the same thickness
20 Which electrical quantity has the same units as electromotive force. Charge Current Potential difference Power
21 When Electric current flows through the wire it increases. P.E of the atoms K.E. of the atomss Atomic size Number of protons
22 The electric current can be defined by its Chemical effect Magnetic effect Heating effect All of these
23 When a magnet is moved into the coil of wire there is a small reading on the galvanometer Which change would increase the size of the reading. Pushing in the S-pole Pulling the magnet out Unwinding some of the turns of wire Moving the magnet faster
24 In gases, the charge carriers are. Atoms Molecules Electrons only Ions and electrons
25 Which of the following is an electrostatic generator. Winshurst machines Van de Graff generator Electrophorus All of the above
26 The distribution of electrical charge i an object caused by teh influence of nearby charges is called. Electric potential Electrostatic induction Electric flux Electric dipole moment
27 The unit of electrochemical potential is. J mol-1 volt J C-1 Mol J-1
28 Why are charged capacitors dangerous. They can leak a harmful chemicals They can cause loss of vision They can release a lethal charge They can release gama rays.
29 The magnetic flux density at the centre of a long solenoid is dependent on. The number of turns per unit length of the silenced The volume of the solenoid The diameter of each turn of the solenoid All of above
30 Inserting a di electric between the plates of a charged parallel plate capacitor. Decrease the capacitance Leaves teh capacitance the same Encourages breakdown between the plates Reduces the electric intensity between the plates
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