Question 511 Mark
Crystal structure of NaCl is (a) Fcc(b) Bcc(c) Both of the above(d) None of the above
Answer
View full question & answer→(a) Fcc
Questions · Page 2 of 9
M.C.Q (1 Marks)
Question 521 Mark
In a crystal, the atoms are located at the position of(a) Maximum potential energy (b) Minimum potential energy(c) Zero potential energy(d) Infinite potential energy
Answer
View full question & answer→(b) Minimum potential energy
Question 531 Mark
The valence of the impurity atom that is to be added to germanium crystal so as to make it a N-type semiconductor, is (a) 6 (b) 5(c) 4 (d) 3
Answer
View full question & answer→(b) 5
Question 541 Mark
Which one of the following is the weakest kind of bonding in solids(a) Ionic (b) Metallic(c) Vander Waals(d) Covalent
Answer
View full question & answer→(c) Vander Waals
Question 551 Mark
Metallic solids are always opaque because(a) Solids effect the incident light (b) Incident light is readily absorbed by the free electron in a metal(c) Incident light is scattered by solid molecules(d) Energy band traps the incident light
Answer
View full question & answer→(b) Incident light is readily absorbed by the free electron in a metal
Question 561 Mark
In a triclinic crystal system(a) a ≠ b ≠ c, α ≠ β ≠ γ(b) a = b = c, α ≠ β ≠ γ(c) a ≠ b ≠ c, α ≠ β = γ(d) a = b ≠ c, α = β = γ
Answer
View full question & answer→(a) a ≠ b ≠ c, α ≠ β ≠ γ
Question 571 Mark
Biaxial crystal among the following is (a) Calcite(b) Quartz(c) Selenite(d) Tourmaline
Answer
View full question & answer→(d) Tourmaline
Question 581 Mark
In good conductors of electricity, the type of bonding that exists is(a) Ionic (b) Vander Waals(c) Covalent(d) Metallic
Answer
View full question & answer→(d) Metallic
MCQ 591 Mark
The grid voltage of any triode valve is changed from $–1$ volt to $– 3$ volt and the mutual conductance is $3 \times 10^{-4}$ mho. The change in plate circuit current will be
- A$0.8\ mA$
- ✓$0.6\ mA$
- C$0.4\ mA$
- D$1\ mA$
Answer
View full question & answer→Correct option: B.
$0.6\ mA$
$0.6\ mA$
Question 601 Mark
Copper has face centered cubic (fcc) lattice with interatomic spacing equal to 2.54Å. The value of the lattice constant for this lattice is (a) 1.27 Å(b) 5.08 Å(c) 2.54 Å (d) 3.59 Å
Answer
View full question & answer→(d) 3.59 Å
Question 611 Mark
Which of the following is an amorphous solid(a) Glass(b) Diamond(c) Salt (d) Sugar
Answer
View full question & answer→(a) Glass
Question 621 Mark
Sodium has body centred packing. If the distance between two nearest atoms is 3.7 Å, then its lattice parameter is (a) 4.8 Å (b) 4.3 Å(c) 3.9 Å (d) 3.3 Å
Answer
View full question & answer→(b) 4.3 Å
MCQ 631 Mark
What is the net force on a $Cl^–$ placed at the centre of the bcc structure of $CsCl$
- ✓Zero
- B$ke ^2 / a ^2$
- C$ke ^2 a ^2$
- DData is incomplete
Answer
View full question & answer→Correct option: A.
Zero
Zero
Question 641 Mark
The laptop PC’s modern electronic watches and calculators use the following for display(a) Single crystal(b) Poly crystal(c) Liquid crystal(d) Semiconductors
Answer
View full question & answer→(c) Liquid crystal
Question 651 Mark
A solid reflects incident light and it’s electrical conductivity decreases with temperature. The binding in this solids(a) Ionic (b) Covalent(c) Metallic(d) Molecular
Answer
View full question & answer→(c) Metallic
MCQ 661 Mark
Atomic radius of $fcc$ is
- A$\frac{ a }{2}$
- ✓$\frac{a}{2 \sqrt{2}}$
- C$\frac{\sqrt{3}}{4} a$
- D$\frac{\sqrt{3}}{2} a$
Answer
View full question & answer→Correct option: B.
$\frac{a}{2 \sqrt{2}}$
$\frac{a}{2 \sqrt{2}}$
Question 671 Mark
The coordination number of Cu is (a) 1(b) 6 (c) 8 (d) 12
Answer
View full question & answer→(d) 12
Question 681 Mark
Which of the following materials is non crystalline(a) Copper(b) Sodium chloride(c) Wood (d) Diamond
Answer
View full question & answer→(c) Wood
Question 691 Mark
In which of the following ionic bond is present(a) NaCl(b) Ar(c) Si (d) Ge
Answer
View full question & answer→(a) NaCl
Question 701 Mark
The expected energy of the electrons at absolute zero is called (a) Fermi energy(b) Emission energy(c) Work function(d) Potential energy
Answer
View full question & answer→(a) Fermi energy
Question 711 Mark
The nature of binding for a crystal with alternate and evenly spaced positive and negative ions is(a) Covalent(b) Metallic(c) Dipolar(d) Ionic
Answer
View full question & answer→(d) Ionic
Question 721 Mark
The temperature coefficient of resistance of a conductor is (a) Positive always(b) Negative always(c) Zero (d) Infinite
Answer
View full question & answer→(a) Positive always
MCQ 731 Mark
Potassium has a bcc structure with nearest neighbour distance $4.525 \mathring A$ . Its molecular weight is $39.$ Its density in $\ kg/m^3$ is
- ✓$900$
- B$494$
- C$602$
- D$802$
Answer
View full question & answer→Correct option: A.
$900$
$900$
MCQ 741 Mark
For germanium crystal, the forbidden energy gap in joules is
- ✓$1.12 \times 10^{-19}$
- B$1.76 \times 10^{-19}$
- C$1.6 \times 10^{-19}$
- DZero
Answer
View full question & answer→Correct option: A.
$1.12 \times 10^{-19}$
$1.12 \times 10^{-19}$
Question 751 Mark
In the CB mode of a transistor, when the collector voltage is changed by 0.5 volt. The collector current changes by 0.05 mA. The output resistance will be(a) 10 kW (b) 20 kW(c) 5 kW (d) 2.5 kW
Answer
View full question & answer→(a) 10 kW
MCQ 761 Mark
The relation between $I_p$ and $V_p$ for a triode is
$I_{p}=\left(0.125 V_{p}-7.5\right) mA$ , keeping the gria potential constant at $1 V$ , the value of $r_p$ will be
$I_{p}=\left(0.125 V_{p}-7.5\right) mA$ , keeping the gria potential constant at $1 V$ , the value of $r_p$ will be
- A$8 k \Omega$
- B$4 k \Omega$
- C$2 k \Omega$
- ✓$8 k \Omega$
Answer
View full question & answer→Correct option: D.
$8 k \Omega$
$8 k \Omega$
MCQ 771 Mark
The output in the circuit of figure is taken across a capacitor. It is as shown in figure
- A
- B
- ✓
- D
Answer
View full question & answer→Correct option: C.
MCQ 781 Mark
In the half$-$wave rectifier circuit shown. Which one of the following wave forms is true for $V_{C D}$, the output across $C$ and $D$ ?
- A
- ✓
- C
- D
Answer
View full question & answer→Correct option: B.
MCQ 791 Mark
The following configuration of gate is equivalent to
- A$\text{NAND}$
- ✓$\text{XOR}$
- C$\text{OR}$
- DNone of these
Answer
View full question & answer→Correct option: B.
$\text{XOR}$
$\text{XOR}$
Question 801 Mark
The PN junction diode is used as(a) An amplifier(b) A rectifier(c) An oscillator(d) A modulator
Answer
View full question & answer→(b) A rectifier
MCQ 811 Mark
In a forward biased $PN-$junction diode, the potential barrier in the depletion region is of the form.
- A
- ✓
- C
- D
Answer
View full question & answer→Correct option: B.
MCQ 821 Mark
The correct curve between voltage gain $\left({ }^{A_L}\right)$ and load resistance $\left({ }^{R_L}\right)$ is
- A
- B
- ✓
- D
Answer
View full question & answer→Correct option: C.
MCQ 831 Mark
If the thermionic current density is $J$ and emitter temperature is $T$ then the curve between ${\frac{J}{T^2}}$ and $\frac{1}{T}$ will $b$
- A
- B
- ✓
- D
Answer
View full question & answer→Correct option: C.
MCQ 841 Mark
The ratio of thermionic currents $(I/I_0)$ for a metal when the temperature is slowly increased To to $T$ as shown in figure. $(I$ and $I_0$ are currents at $T$ and respectively$)$. Then which one is correct?
- ✓$A$
- B$B$
- C$C$
- D$D$
Answer
View full question & answer→Correct option: A.
$A$
$A$
MCQ 851 Mark
The point representing the cut off grid voltage on the mutual characteristic of triode is
- A$S$
- B$R$
- C$O$
- ✓$P$
Answer
View full question & answer→Correct option: D.
$P$
$P$
MCQ 861 Mark
Figure gives a system of logic gates. From the study of truth table it can be found that to produce a high output $(1)$ at $R,$ we must have
- A$X = 0, Y = 1$
- B$X = 1, Y = 1$
- ✓$X = 1, Y = 0$
- D$X = 0, Y = 0$
Answer
View full question & answer→Correct option: C.
$X = 1, Y = 0$
$X = 1, Y = 0$
MCQ 871 Mark
Assertion : $29$ is the equivalent decimal number of binary number $11101.$
Reason: $(11101)_2=\left(1 \times 2^4+1 \times 2^3+1 \times 2^2+0 \times 2^1+1 \times 2^0\right)_{10}=(16+8+4+0+1)_{10}=(29)_{10}$
Reason: $(11101)_2=\left(1 \times 2^4+1 \times 2^3+1 \times 2^2+0 \times 2^1+1 \times 2^0\right)_{10}=(16+8+4+0+1)_{10}=(29)_{10}$
- ✓If both assertion and reason are true and the reason is the correct explanation of the assertion.
- BIf both assertion and reason are true but reason is not the correct explanation of the assertion.
- CIf assertion is true but reason is false.
- DIf the assertion and reason both are false.
Answer
View full question & answer→Correct option: A.
If both assertion and reason are true and the reason is the correct explanation of the assertion.
If both assertion and reason are true and the reason is the correct explanation of the assertion.
MCQ 881 Mark
The voltage gain of the following amplifier is
- A$10$
- ✓$100$
- C$1000$
- D$9.9$
Answer
View full question & answer→Correct option: B.
$100$
$100$
MCQ 891 Mark
In the grid circuit of a triode a signal $E=2^{\sqrt{2}} {\cos \omega t}$ is applied. If $m=14$ and $r_p=10\ kW$ then root mean square current flowing through $R _{ L }=12 k \Omega$ will be
- ✓$1.27\ mA$
- B$10\ mA$
- C$1.5\ mA$
- D$12.4\ mA$
Answer
View full question & answer→Correct option: A.
$1.27\ mA$
$1.27\ mA$
MCQ 901 Mark
Which of the following figures correctly shows the phase relation between the input signal and the output signal of triode amplifier.
- ✓
- B
- C
- D
Answer
View full question & answer→Correct option: A.
MCQ 911 Mark
The variation of anode current in a triode corresponding to a change in grid potential at three different values of the plate potential is shown in the diagram. The mutual conductance of the triode is
- ✓$2.5 m$ mho
- B$5.0 m$ mho
- C$7.5 m$ mho
- D$10.0 m$ mho
Answer
View full question & answer→Correct option: A.
$2.5 m$ mho
$2.5 m$ mho
MCQ 921 Mark
The plate current in a triode is given by $I _{ p }=0.004\left(V_{ p }+10 V_{ g }\right)^{3 / 2} mA$ where $I _{ p }, V _{ p }$ and $V _{ g }$ are the values of plate current, plate voltage and grid voltage, respectively. What are the triode parameters $\mu, r_p$ and $g_m$ for the operating point at $V_p=120$ volt and $V _{ g }=-2$ volt?
- ✓$10, 16.7 k\Omega, 0.6\ m \ mho$
- B$15, 16.7 k\Omega, 0.06\ m\ mho$
- C$20, 6 k\Omega, 16.7\ m \ mho$
- DNone of these
Answer
View full question & answer→Correct option: A.
$10, 16.7 k\Omega, 0.6\ m \ mho$
$10, 16.7 k\Omega, 0.6\ m \ mho$
MCQ 931 Mark
In the following common emitter configuration an $\text{NPN}$ transistor with current gain $b = 100$ is used. The output voltage of the amplifier will be
- A$10 mV $
- B$0.1 V$
- ✓$1.0 V$
- D$10 V$
Answer
View full question & answer→Correct option: C.
$1.0 V$
$1.0 V$
MCQ 941 Mark
In the circuit shown in figure the maximum output voltage $V_0$ is
- A$0 \ V$
- ✓$ 5 \ V$
- C$10 \ V$
- D$11\ V$
Answer
View full question & answer→Correct option: B.
$ 5 \ V$
$ 5 \ V$
MCQ 951 Mark
The value of plate current in the given circuit diagram will be
- A$3\ mA$
- B$8\ mA$
- ✓$13\ mA$
- D$18\ mA$
Answer
View full question & answer→Correct option: C.
$13\ mA$
$13\ mA$
MCQ 961 Mark
Which represents $\text{NAND}$ gate
- ✓
- B
- C
- D
Answer
View full question & answer→Correct option: A.
Question 971 Mark
The truth table shown in figure is for
(a) XOR(b) AND(c) XNOR(d) OR
| A | 0 | 0 | 1 | 1 |
| B | 0 | 1 | 0 | 1 |
| y | 1 | 0 | 0 | 1 |
Answer
View full question & answer→(c) XNOR
MCQ 981 Mark
Given below are four logic gate symbol $($figure$).$ Those for $\text{OR, NOR}$ and $\text{NAND}$ are respectively
- A$1, 4, 3$
- B$4, 1, 2$
- ✓$1, 3, 4$
- D$4, 2, 1$
Answer
View full question & answer→Correct option: C.
$1, 3, 4$
$1, 3, 4$
MCQ 991 Mark
A semiconductor $X$ is made by doping a germanium crystal with arsenic $(Z = 33).$ A second semiconductor $Y$ is made by doping germanium with indium $(Z = 49).$ The two are joined end to end and connected to a battery as shown. Which of the following statements is correct
- A$X$ is $P-$type, $Y$ is $N-$type and the junction is forward biased
- B$X$ is $N-$type, $Y$ is $P-$type and the junction is forward biased
- C$X$ is $P-$type, $Y$ is $N-$type and the junction is reverse biased
- ✓$X$ is $N-$type, $Y$ is $P-$type and the junction is reverse biased
Answer
View full question & answer→Correct option: D.
$X$ is $N-$type, $Y$ is $P-$type and the junction is reverse biased
$X$ is $N-$type, $Y$ is $P-$type and the junction is reverse biased
MCQ 1001 Mark
The combination of $\text{NAND}$ gates shown here under $($figure$)$ are equivalent to
- ✓An $\text{OR}$ gate and an $\text{AND}$ gate respectively
- BAn $\text{AND}$ gate and a $\text{NOT}$ gate respectively
- CAn $\text{AND}$ gate and an $\text{OR}$ gate respectively
- DAn $\text{OR}$ gate and a $\text{NOT}$ gate respectively.
Answer
View full question & answer→Correct option: A.
An $\text{OR}$ gate and an $\text{AND}$ gate respectively
An $\text{OR}$ gate and an $\text{AND}$ gate respectively