Question 2 :
Current in circuit, which makes bulb glow or heats up the wire, is:
Question 4 :
Assertion : A current carrying wire should be charged.<br>Reason : The current in a wire is due to flow of free electrons in a definite direction.<br><br>
Question 6 :
In an inert gas discharge tube $2.9 \times 10^{18}$ positive ions $(e^+)$ moves to the right through a cross-section of the tube each second, while $1.2 \times 10^{18}$ negative ions $(r^{-})$ move to the left in the same time.The magnitude of current is
Question 7 :
The ionization potential of hydrogenic ions $P$ and $Q$ are ${V}_{P}$ and ${V}_{Q}$ respectively. If ${ V }_{ Q }<{ V }_{ P }$ then radii
Question 9 :
When 1 coulomb of charge flows through a conductor in 1 sec, then the current passing through the conductor is?
Question 11 :
No current flows between two charged bodies when connected if they have same:
Question 15 :
Match<br/><table class="wysiwyg-table"><tbody><tr><td>1. Current carrying wire</td><td>a. current is constant</td></tr><tr><td>2. Water carrying pipe</td><td>b. Av = constant</td></tr></tbody></table>
Question 18 :
The current in a car headlamp is $3.0$A when connected to a $12$V battery. What is the resistance of the lamp when it is lit?
Question 20 :
No current flows between two charged bodies connected together when they have the same :
Question 23 :
In an electric bulb a current of $10A$ flows for $2$hrs . Find the amount of charge that has passed through the bulb.
Question 27 :
When the potential difference between two points is 1 volt and current through it is 1 A, then the resistance between the points is:
Question 28 :
Heat produced in a wire of resistance R due to current flowing at constant potential difference is proportional to
Question 30 :
The potential difference across a $6\Omega$ resistor is $12V$. The current flowing in the resistor will be<br/>
Question 31 :
If $18,400 \ C$ of charge flows through an air conditioning unit every hour, what current does it draw?
Question 32 :
A cylindrical capacitor has two co-axial cylinders of length 20 cm and radii 2r and r.Inner cylinder is given a charge 10 $\mu C$ and outer cylinder a charge of -10 $\mu C$.The potential difference between the two cylinders will be.
Question 33 :
A $4 \mu F$ capacitor and a resistance of $2.5 \space M \Omega$ are in series with $12 V$ battery. Find the time after which the potential difference across the capacitor is $3$ times the potential difference across the resistor. $[In2 = 0.63] $    
Question 34 :
When a current flows through a conductor $AB$ from end $A$ to the other end $B$, the charge carriers in motion are _______.
Question 36 :
<span>What is the approximate resistance setting of a rheostat in which $650 \  mA$ of current flows with a $150 \ V$ source?</span>
Question 37 :
Direction of conventional electrical current is opposite to direction of flow of electrons. Choose analogous statement for water:
Question 38 :
The quantity $X = \dfrac {\epsilon_{0}LV}{t} : \epsilon_{0}$ is the permittivity of free space, $L$ is length, $V$ is potential difference and $t$ is time. The dimensions of $X$ are same as that of
Question 39 :
In coolidge tube the potential difference between cathode and anticathode is $120kV$. The maximum energy of emitted X-rays will be :-
Question 41 :
In a circuit having one bulb, another bulb is added in series with another. Then the <span>bulbs will :</span>
Question 43 :
Electrical resistance is a function of _____ and speed of water in pipe is a function of ________
Question 45 :
Which of the following statements is true about the flow of electrons in an electric circuit?<br>