PPSC Physics Chapter 6 Electricity and Magnetism With Answers

image
image
image

PPSC Physics Chapter 6 Electricity and Magnetism

Sr. # Questions Answers Choice
1 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
2 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
3 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
4 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
5 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
6 Object may acquire an excess or deficiency of charge by Rubbing them together Grounding them Applying coulomb's principle Shielding them
7 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
8 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
9 The speed of the charging or discharging a capacitor depends upon the product of resistance and. Current Voltage Capacitance Potential difference
10 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
11 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
12 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
13 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
14 The charge on an Isolated conductor always lies. Within the conductor At the centre of the conductor On the surface of the conductor Outside the surface of the conductor
15 If a di electric is placed between the plates of a capacitor, its capacitance. Decreases Increases Remains unaffected Is zero
16 The permittivity of a medium. Is a measure of the density Is equal to unity for air Depends on the charge derisory of the medium Determines the magnitude of an electric field that can be established by the medium
17 The capacitance of a capacitor increases with a decreases in. Plate area Permitivity Plate separation Dielectric constant
18 On which parameter the time required to charge a capacitor depends upon. magnitude of charge Applied potential difference Capacitances Time constant
19 According to Gauss's law the number of electric field lines crossing any closed surface is. numerically equal to the enclosed charge Equal to the enclosed positive charge Equal to teh electric field inside the surface Equal to the charge density on the surface.
20 As a positively charged rod is brought closer and closer to a positively charged electroscope the gold leaf. diverges Converges is neutralized Is unaffected
Download This Set

Is this page helpful?

×