PPSC Physics Full Book With Answers

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PPSC Physics Full Book

Sr. # Questions Answers Choice
1 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
2 If a di electric is placed between the plates of a capacitor, its capacitance. Decreases Increases Remains unaffected Is zero
3 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
4 The capacitance of a capacitor increases with a decreases in. Plate area Permitivity Plate separation Dielectric constant
5 On which parameter the time required to charge a capacitor depends upon. magnitude of charge Applied potential difference Capacitances Time constant
6 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.
7 As a positively charged rod is brought closer and closer to a positively charged electroscope the gold leaf. diverges Converges is neutralized Is unaffected
8 The spacing of electric field lines between two identical point charges of opposite signs Is not indication of the field direction Is not dependent on the magnitude of the charges Is an indication of the field strength Is large when the charges are very large
9 Electrostatic force as compared to gravitational force is Zero infinite Very weak Very strong
10 The field inside a hollow spherical conductor is. Constantin zero Constant but not necessarily zero A function of charge on sphere a function of distance from the centre
11 What is the part of a simply D.C. motor that reverses the direction of current through the coil every half cycle. Armature Brushes Commutator Slip rings
12 What happens when a 250 V, 2500 W water heater is connected to main supply using a plug fitted with a 5 A fuse. The fuse in the plug melts The heartier burns out The hearter runs at half power The hearter works normally
13 A torch bulb uses a 3 V supply and makes a current of 0.2 A It is switched on for one minute How much electrical energy is used. 0.6 J 12 J 24 J 36 J
14 A heater which is to be used on a 250 V mains circuit, has a 5 A fuse in its plug Which of the following is the most powerful heater that can be used with this fuse. 150 W 500 W<br> 1,000 W 2,000 W
15 If a charged body is moved against the electric field it will gain. P.E K.E. Electrical P.E. Gravitational energy
16 Condenser is used To produce charge To change the direction of current To collect the charge As a good conductor of electricity
17 The relation between the voltage and current that flows in a resistor is. V = 1/R R = vi V = I2 R I = V /R
18 Magnetic fields do not interact with Stationary electric charges Stationary permanent magnets Moving electric charges Moving permanent magnets
19 The force experienced by a unit positive charge at that point placed in an magnetic field is known as. Electric field intensity Electric flux Electric potential Electric dipole
20 A pair of point charges with equal magnitude and opposite sign separated by a distance 'r' produce. Electric dipole Electric charge Electric field electric arc
21 Which of the following defines P.E. per unit charge. Electric current Charges Potential Electric field
22 Which of the following does not reflect the laws of static charges. like charges repel Opposite charges attract Neutral charges repel Neutral objects are attracted to charged ones.
23 What is the about the electric field inside a metallic sphere. It is zero It varies with the shape of the conductor It depends on the charge there It does not charge the metallic sphere
24 When a balloon sticks to the whiteboard It is an example of. Conoduction Induction Polarization Conservation of charge
25 Which method of charging is involved in making lightning. Induction Friction Contact <br>Convection
26 When a positive charge is allowed to move from positive to negative plate, then it will gain P.E. K.E Gravitational energy Electrical P.E.
27 The capacity of a spherical conductor is numerically equal to its. Surface area Diameter Radius Volume
28 As electric field intensity is a potential gradient, if may be expressed ni the units of NC-1 or volt Volt metre Volt per metre Joule
29 When a conductor situated in a dielectric is charted the energy resides. Only on the dielectric Only on medium surrounding charge On the dielectric and medium both Only on the type of the charge
30 The amount of charge which can be placed on a conductor does not depend on. The dielectric strength of the surrounding medium. Its capacitance Its potential Its size or shape
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