PPSC Physics Full Book With Answers

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PPSC Physics Full Book

Sr. # Questions Answers Choice
1 In which form energy is stored in acondenser. Electric energy Potential energy Kinetic energy Magnetic energy
2 Lines of force are imaginary lines drawn so as to be energy point. parallel to equipotential surface Normal to the electric field Indicative of the position of the nearest source charge Tangent to the electric field
3 The electric field intensity of a point charge varies. Directly as the square of the distance from the charge Directly as the square of the charge Inversely as teh distance from the charge. Inversely as the square of the distance from the charge
4 When a point charge which is responsible for a force being exerted on another point charge is suddenly moved the second charge experience. Nor charge of force An instantaneous change of force A sudden change of force of some later time an increase of its charge because of induction.
5 The force exerted by two charged bodies on another obeys Coulomb's law provided that Both bodies are in the same medium the charges are not too great On body does not lie inside the other The linear dimensions of the body are very much less than the distance between the bodies.
6 A device used to detect and measure charge is. A voltmeter An ammeter An electroscope An amplifier
7 Coulomb found that the mutual force between tow electric charges varies. Inversely as the distance Inversely as the square of the distance directly as the distance Directly as the distance squared
8 Which of the following is an electrical insulator that can be polarized by an applied electric field. Conductor Condenser Di electric Capacitor
9 Which of the following is the ability to hold an electric charge in electromagnetism. Resistance Impedance Inductance Capacitance
10 A charge kept at the centre of a shell The shell has charge Q and radius R The force on the central charge due to shell is in the upward direction Towards left Towards right Zero
11 No current flows between two charged bodies when connected if they have same. Charge Capacity Potential Shape
12 In comparison with the electrostatic force between two electrons the electrostatic force between two protons is. Zero Smaller Greater Same
13 A charged capacitor has charge on its Outside surface Inner surface Surroundings Mid point
14 Force acting on a test charge between the plates of a parallel plate capacitor is F. If one of the plates is removed teh force on the same test charge will be. Zero F/2 F 2 F
15 If the number of coulombs per second through a wire of 10 Ohm resistance across a 120 V line is 12, the current is 5 A 10 A 12 A 15 A
16 When a current of 2 A flows for 5 s through a lamp 120 W of power are used How much charge flows through the lamp. 10 C 12 C 24 C 60 C
17 When 5 C of charge flows through a particular resistor 10 J of energy is converted What is the p.d. across the resistor. 0.5 V 2.0 V 15 V 50 V
18 A battery drives 50 C of charge round a circuit. The total work done is 750 J What is the electromotive force of the battery. 0.07 V 15 V 700 V 1500 V
19 The separation between the plates of a parallel plate capacitor with original capacitance C is doubled its present capacitance will be. 1/4 C 1/2 C 2C 4 C
20 When a charged rod is brought near bits of dry cork dust The dust will. Cling firmly to rod Be replied from the rod Attract itself to the rod a first and then fly off Be repelled at first and then be drawn to the rod
21 When two point charges of equal magnitude and opposite sign exist very close to one another the arrangement is called. An electric dipole An amperian current A null charge A neutral source
22 Positive electric charge is the type of charge found on a rod which has been rubbed with silk and which is made of. rubber Glass Steel Cork
23 Object may acquire an excess or deficiency of charge by Rubbing them together Grounding them Applying coulomb's principle Shielding them
24 In a charged capacitor the energy resides In the negative plate In the positive plate In the field between the plates Around the edge of the plates
25 The gravitational potential inside a hollow spherical shell Increases from zero at the centre to the maximum value at the surface Is zero throughout the inteior Decreases from the centre Is uniform throughout the interior
26 The speed of the charging or discharging a capacitor depends upon the product of resistance and. Current Voltage Capacitance Potential difference
27 On which of the following parameters the amount of charge that can be placed on a conductor does not depend on. Its capacitance Its size or shape its potential Dielectric strength of the surrounding medium
28 The electric heater takes a current of 4 A from a 250 V supply . How long would it take the heater to convert 400,000 J of electric energy. 100 s <div>200 s</div> 400 s 750 s
29 A dry battery can deliver 3,000 J energy to a small 2 W electric motor before the battery is exhausted for how minutes does the motor run. 20 minutes 25 minutes 75 minutes 125 minutes
30 In the direction indicated by an electric field line. The electric field strength must increases The electric field strength must decreases The potential must remain constant The potential must decreases
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