Question 1

If charge stored on plates of capacitor is large, then capacitance will be&#10;A)small&#10;B)large&#10;C)zero&#10;D)infinite

Accepted Answer

The capacitance of a capacitor is directly proportional to the charge stored on its plates. Therefore, if a large charge is stored, the capacitance will also be large.

Question 2

insulator which is placed between 2 plates of capacitor is&#10;A)electric&#10;B)dielectric&#10;C)inductor&#10;D)resistor

Accepted Answer

The insulator placed between the two plates of a capacitor is known as a dielectric. It increases the capacitor's ability to store charge by reducing the electric field within the capacitor, which allows for a higher charge to be stored for a given voltage.

Question 3

Combined capacitance is equal to the&#10;A)sum of all capacitance of capacitors&#10;B)product of all the capacitance&#10;C)difference between the capacitors&#10;D)average capacitance of capacitors

Accepted Answer

The combined capacitance of capacitors connected in parallel is equal to the sum of all individual capacitances.

Question 4

capacitance and charge on plates are&#10;A)inversely related&#10;B)directly related&#10;C)not related at all&#10;D)always equal

Accepted Answer

Capacitance and charge on plates are directly related, as described by the equation Q = CV, where Q is the charge, C is the capacitance, and V is the voltage. This means that as the charge (Q) on a capacitor's plates increases, the capacitance (C) does not change inherently (it's a property of the capacitor's physical configuration and dielectric material), but the relationship indicates that for a given capacitance, a higher charge results from a higher voltage applied.

Question 5

If the capacitors are connected in parallel, then the potential difference across each capacitor is&#10;A)same&#10;B)different&#10;C)zero&#10;D)infinite

Accepted Answer

In a parallel connection, each capacitor is directly connected across the power supply, so the potential difference (voltage) across each capacitor is the same as the source voltage.

Question 6

Total capacitance of 300 mF capacitor and a 600 mF in series is&#10;A)300 mF&#10;B)500 mF&#10;C)200 mF&#10;D)1000 mF

Accepted Answer

The total capacitance, $C_{total}$, of capacitors in series is given by the reciprocal of the sum of the reciprocals of their individual capacitances. For capacitors in series: $\frac{1}{C_{total}} = \frac{1}{C_1} + \frac{1}{C_2}$. Substituting $C_1 = 300$ mF and $C_2 = 600$ mF, we get $\frac{1}{C_{total}} = \frac{1}{300} + \frac{1}{600} = \frac{1}{200}$, so $C_{total} = 200$ mF.

Question 7

Work done in charging a capacitor is given by&#10;A)(1&#8260;2)QV&#10;B)2QV&#10;C)QV&#10;D)2V

Accepted Answer

The work done in charging a capacitor is given by the formula (1/2)QV, where Q is the charge and V is the voltage across the capacitor. This energy is stored in the electric field between the capacitor's plates.

Question 8

Device used to store energy in electrical circuits is&#10;A)resistor&#10;B)inductor&#10;C)capacitor&#10;D)diode

Accepted Answer

Capacitors are used to store energy in electrical circuits.

Question 9

Energy stored in a 2000 mF capacitor charged to a potential difference of 10 V is&#10;A)0.12 J&#10;B)1.3 J&#10;C)0.10 J&#10;D)3 J

Accepted Answer

The energy (E) stored in a capacitor is given by the formula E = 1/2 C V^2, where C is the capacitance in farads and V is the potential difference in volts. Substituting the given values, E = 1/2 * 2000 * 10^-3 F * (10 V)^2 = 0.1 J.

Question 10

Capacitor is fully charged if potential difference is equal to&#10;A)e.m.f&#10;B)current&#10;C)resistance&#10;D)power

Accepted Answer

A capacitor is considered fully charged when the potential difference across its plates equals the electromotive force (e.m.f) of the source charging it.

Question 11

Hall voltage is directly proportional to&#10;A)current&#10;B)electric field&#10;C)magnetic flux density&#10;D)all of above

Accepted Answer

The answer of Hall voltage is directly proportional to&#10;A)current&#10;B)electric field&#10;C)magnetic...

Question 12

Force due to magnetic field and velocity is&#10;A)at right angles to each other&#10;B)at acute angles with each other&#10;C)at obtuse angle with each other&#10;D)antiparallel to each other

Accepted Answer

The answer of Force due to magnetic field and velocity...

Question 13

Force on a moving charge in a uniform magnetic field depends upon&#10;A)magnetic flux density&#10;B)the charge on the particle&#10;C)the speed of particle&#10;D)all of above

Accepted Answer

The answer of Force on a moving charge in a...

Question 14

Electric field strength related to hall voltage is given by&#10;A)VHd&#10;B)VH&#8260;d&#10;C)VHE&#10;D)Ed

Accepted Answer

The answer of Electric field strength related to hall voltage...

Question 15

Hall probe is made up of&#10;A)metals&#10;B)non metals&#10;C)semiconductor&#10;D)radioactive material

Accepted Answer

The answer of Hall probe is made up of&#10;A)metals&#10;B)non metals&#10;C)semiconductor&#10;D)radioactive...

Question 16

For an electron, magnitude of force on it is&#10;A)BeV&#10;B)eV&#10;C)Be&#10;D)BV

Accepted Answer

The answer of For an electron, magnitude of force on...

Question 17

When current is parallel to magnetic fields, force on conductor is&#10;A)zero&#10;B)infinite&#10;C)2 times&#10;D)same

Accepted Answer

The answer of When current is parallel to magnetic fields,...

Question 18

Direction of conventional current is&#10;A)direction of neutron flow&#10;B)direction of electron flow&#10;C)direction of flow of positive charge&#10;D)same as that of electric current

Accepted Answer

The answer of Direction of conventional current is&#10;A)direction of neutron...

Question 19

According to the equation 'r =(mv)&#8260;(Be)', the faster moving particles&#10;A)move in smaller circle&#10;B)move straight&#10;C)move in bigger circle&#10;D)move randomly

Accepted Answer

The answer of According to the equation 'r =(mv)&#8260;(Be)', the...

Question 20

In Hall effect, voltage across probe is known as&#10;A)hall voltage&#10;B)e.m.f&#10;C)potential difference&#10;D)hall potential

Accepted Answer

The answer of In Hall effect, voltage across probe is...

Question 21

Angle through which an object has moved is called it's&#10;A)linear displacement&#10;B)linear distance&#10;C)angular displacement&#10;D)angular distance

Accepted Answer

The answer of Angle through which an object has moved...

Question 22

Angular velocity of second hand of clock is 0.105 rad s^-1 and length of hand is 1.8 cm, then speed of tip of hand is {{}} A)0.189 cm s^-1 B)1 cm s^-1 C)0.189 m s^-1 D)2 m s^-1

Accepted Answer

The answer of Angular velocity of second hand of clock...

Question 23

Object moving along a circular path is&#10;A)in equilibrium&#10;B)not in equilibrium&#10;C)not moving with constant speed&#10;D)in random motion

Accepted Answer

The answer of Object moving along a circular path is&#10;A)in...

Question 24

At the fairground, the force that balances out our weight is&#10;A)centripetal force&#10;B)centrifugal force&#10;C)friction&#10;D)gravitational force

Accepted Answer

The answer of At the fairground, the force that balances...

Deck 4: Physics Capacitance, Magnetic Fields, and Circular Motion