Question 2 :
In a moving cell galvanometer, we use a radial magnetic field so that the galvanometer scale is<br>
Question 3 :
A moving coil type of galvanometer is based upon the principle that<br>
Question 4 :
The current that must flow through the coil of a galvanometer so as to produce a deflection of one division on its scale is called<br>
Question 5 :
Kirchoff's first law, i.e., $\sum i = 0$ at a junction, deals with the conservation of
Question 6 :
If $10$% of the main current is to be passed through the moving coil galvanometer of resistance $99\Omega$, then the required shunt resistance will be :<br>
Question 8 :
In the metre bridge experiment of resistances, the known and unknown resistances are inter-changed. The error so removed is:<br/>
Question 10 :
<span>State whether given statement is True or False<br/>The sum of all the voltage drops around a single closed loop in a circuit is zero.</span>
Question 11 :
In a meter bridge experiment, the ratio of the left gap resistance to right gap resistance is $2 : 3$, the balance point from left is?
Question 13 :
In the experiment of half deflection method the resistance R should be
Question 14 :
What is shape of magnet in moving coil galvanometer to make the radial magnetic field?
Question 15 :
Point out the right statements about the validity of Kirchhoff's junction rule.
Question 16 :
Phosphor-bronze wire is used for suspension in a moving coil galvanometer, because it has.
Question 17 :
In moving coil galvanometer, strong horses shoe magnet of concave shaped pole pieces is used to?
Question 18 :
In a meter bridge experiment, null point is obtained at 20 cm from one end of the wire when resistance X is balanced against another resistance Y. If $ X< Y $, then where will be the new position of the null point from the same end, if one decides to balance a resistance of 4 X against Y
Question 19 :
A galvanometer of 50 gives full scale deflection with 2 mA current as to convert it into ammeter range of 10 A is connected with it then shunt resistance will be<br/>
Question 20 :
In Wheatstone bridge, three resistors $P, Q, R$ are connected in three arms in order and 4th arm $s$ is formed by two resistors ${s}_{1}$ and ${s}_{2}$ connected in parallel. The condition for bridge to be balanced is $\dfrac{P}{Q} =$
Question 21 :
Which among the following devices work on the basis of photo-voltaic effect?
Question 23 :
The photovoltaic effect is the creation of _______________________ in a material upon exposure to light and is a physical and chemical phenomenon.
Question 24 :
Which of the following is correct, about doping in a transistor?
Question 26 :
Which of the following is correct statement for voltage gain of n-p-n transistor in common emitter configuration?
Question 27 :
In an experiment of photoelectric effect the number of photoelectrons has to be increased without changing their frequency. The suitable step to be taken about the incident radiation for this is
Question 30 :
A change of $400\ mV$ in base-emitter voltage causes a change of $200$ <br> $\mu A $ in the base current. The input resistance of the transistor is<br/>
Question 32 :
<span>In a forward-biased photo-diode with increase in incident light intensity, the diode current:</span>
Question 33 :
At breakdown voltage, the rate of creation of hole-electron pairs is _____ leading to the _______ in current.
Question 34 :
<span>The load voltage is approximately constant when a zener diode is</span>
Question 36 :
Statement-1: Two semi conductors of p and n type form p-n junction which act like a rectifier.<br>Statement-2: A rectifier is used to convert alternating current into direct current.<br>
Question 37 :
The input resistance of a common emitter transistor amplifier, if the output resistance is 500 k$\Omega$, the current gain $\alpha = 0.98$ and the power gain is $6.0625 \times 10^6$, is
Question 38 :
Which is the wrong statement in following sentences? A device in which $P$ and $N-$ type semiconductors are used is more useful then a vacuum type because
Question 40 :
The semiconductor diodes in which carriers are generated by photons (photo-excitation) are called <u> </u> devices.
Question 41 :
<span>If the load resistance decreases in a zener regulator, the zener current</span>
Question 45 :
Assertion: A $P-N$ photodiode is made from a semiconductor for which $E=2.8\ eV.$ This photo diode will not detect the wavelength of $6000 \ nm.$
Reason: A $PN$ Photodiode detect wavelength $\lambda$ if $\dfrac{hc}{\lambda}>E_{g}.$
Question 46 :
For transistor action, state which statements are true:<br/>(1) Base, emitter and collector regions should have similar size and doping concentrations.<br/>(2) The base region must be very thin and lightly doped.<br/>(3) The emitter-base junction is forward biased and base-collector junction is reverse biased<br/><span>(4) Both the emitter-base junction as well as the base-collector junction are forward biased</span>
Question 49 :
Assertion: A p-n junction with reverse bias can be used as a photo-diode to measure light intensity.
Reason: In a reverse bias condition the current is small but is more sensitive to changes in incident light intensity.
Question 50 :
Assertion: A photocell is called an electric eye.
Reason: When light is incident on some semiconductor its electrical resistance is reduced
Question 51 :
An $n-p-n$ transistor has three leads $A,\ B$ and $C$. Connecting $B$ and $C$ by moist fingers, $A$ to the positive lead of an ammeter, and $C$ to the negative lead of the ammeter, one finds large deflection. Then, $A,\ B$ and $C$ refer respectively to :
Question 52 :
There photo dlodes $D_{1}, D_{2}$ and $D_{3}$ are made of semiconductor having band gap $2.5\ eV, 2\ eV$ and $3\ eV$ respectively. Which one will be able to detect light of wavelength $6000\ A^o$?
Question 53 :
A zener diode voltage regulator operated in the range $120-180\ V$ produces a constant supply of $110\ V$ and $250\ mA$ to the load. If the maximum current is to be equally shared between the load and zener, then the values of series resistance ($\displaystyle { R }_{ S }$) and load resistance ($\displaystyle { R }_{ L }$) are:
Question 54 :
The peak voltage in the output of a half wave diode rectifier fed with a sinusoidal signal without filter is $15V.$ The $dc$ component of the output voltage is:
