100525 + Interview Questions in GENERAL QA IN GENERAL AWARENESS

1.	What is the use of supplementary oil tank?
Answer» Supplementary oil tank is used to collect the oil drains from the CIES valves.

Discussion

2.	How dearator pressure is maintained?
Answer» Dearator pressure is normally maintained by extraction steam.

Discussion

3.	What is the purpose of accelerator governer?
Answer» The purpose of accelerator governer is to cut of steam momentarily when large electrical loads are taken to prevent turbine speeding up.

Discussion

4.	What is the use of jacking oil pump?
Answer» Jacking oil pump is used to initial lifting of turbine rotor by hydrostatic lubrication.

Discussion

5.	Explain the main difference between impulse and reaction turbine.
Answer» When the inlet pressure of steam to the turbine is equal to outlet pressure of steam from the turbine is called the impulse turbine. In this type the heat is added is very less. In a reaction turbine, the outlet pressure of steam is less than the inlet pressure of the steam. There is reduction in pressure with the increase in kinetic energy.

5.

Explain the main difference between impulse and reaction turbine.

Answer»

When the inlet pressure of steam to the turbine is equal to outlet pressure of steam from the turbine is called the impulse turbine. In this type the heat is added is very less.

In a reaction turbine, the outlet pressure of steam is less than the inlet pressure of the steam. There is reduction in pressure with the increase in kinetic energy.

Discussion

6.	What is the purpose of turbine governing system?
Answer» Turbine governing system governs the speed of the turbine with the help of centrifugal governer. It reduces the steam inlet when turbine over speeds.

Discussion

7.	What is the purpose of gland steam system?
Answer» Gland steam system is provided to arrest the steam leak from the turbine and to protect the air ingress into the turbine.

Discussion

8.	`I v//s V` curve for a non Ohmic resistance is shown. The dynamic resistance is maximum at point A. `a`B. `b`C. `c`D. same for all
Answer» Dynamic resistance `R = (dv)/(dI) = (1)/(dI//dv) = (1)/(slope)` At Pt a slope is min So R is max .

Discussion

9.	`I v//s V` curve for a non Ohmic resistance is shown. The dynamic resistance is maximum at point A. `a`B. `b`C. `c`D. same for all
Answer» Correct Answer - C Dynamic rasistance `R=(dv)/(di)=(1)/(di//dv)=(1)/(slope)` at pointt. `c`, slope is min, So `R` is max

Discussion

10.	What is the role of graphite rod in the electrometallurgy of aluminium ?
Answer» Graphite rod behaves as anode and is useful for reduction to the metal 2Al₂O₃ + 3C → 4Al → 3CO₂

10.

What is the role of graphite rod in the electrometallurgy of aluminium ?

Answer»

Graphite rod behaves as anode and is useful for reduction to the metal

2Al₂O₃ + 3C → 4Al → 3CO₂

Discussion

11.	Give the oxidation state and coordination number of the central metal ion in the following complexes. (A) [Co(en)3]3+ (B) K4 [Fe(CN)6]
Answer» Calculation of oxidation state of metal in complex ion (A) [Co(en)₃]³⁺ x + 3 (0) = 3 x = 3 Coordination number = 6 (en) is bidentate ligand (B) K₄ [Fe(CN)₆] 4 (+1) + x + 6(–1) = 0 4 + x – 6 = 0 x = 2 Coordination number = 6 (CN) is monodentate ligand

11.

Give the oxidation state and coordination number of the central metal ion in the following complexes. (A) [Co(en)3]3+ (B) K4 [Fe(CN)6]

Answer»

Calculation of oxidation state of metal in complex ion

(A) [Co(en)₃]³⁺

x + 3 (0) = 3

x = 3

Coordination number = 6

(en) is bidentate ligand

(B) K₄ [Fe(CN)₆]

4 (+1) + x + 6(–1) = 0

4 + x – 6 = 0

x = 2

Coordination number = 6

(CN) is monodentate ligand

Discussion

12.	Why phenol are more acidic than alcohol ? Explain.
Answer» Phenols are stronger acids (K_a = 10^–8 – 10^–10) than alcohols (K_a = 10^–16 – 10^–18) because phenoxide ion is stabilized by resonance but alkoxide ion is not.

Discussion

13.	When a voltage is applied to a semiconductor, holes will flow a. Away from the negative potential b. Toward the positive potential c. In the external circuit d. None of the above
Answer» (d) None of the above

Discussion

14.	Arrange the following alcohols in increasing order of their reactivity towards esterification reaction. CH3 – CH2 – OH, (CH3)2 CH– OH, (CH3)3 C–OH
Answer» Increasing order of alcohols reactivity towards esterification reaction. (CH₃)₃ C–OH < (CH₃)₂CH– OH < CH₃ – CH₂ – OH

14.

Arrange the following alcohols in increasing order of their reactivity towards esterification reaction. CH3 – CH2 – OH, (CH3)2 CH– OH, (CH3)3 C–OH

Answer»

Increasing order of alcohols reactivity towards esterification reaction.

(CH₃)₃ C–OH < (CH₃)₂CH– OH < CH₃ – CH₂ – OH

Discussion

15.	A semiconductor has how many types of flow? a. 1 b. 2 c. 3 d. 4
Answer» The correct answer is: (b) 2

Discussion

16.	Why the boiling points of alcohols are higher than hydrocarbons and ether of comparable molecular mass ? Explain.
Answer» The high boiling point of alcohols are mainly due to the presence of intermolecular hydrogen bonding in them which is lacking in ethers and hydrocarbons.

Discussion

17.	Which of the following is an example of a solid solution? (a) sea water (b) sugar solution (c) smoke (d) 22 carat gold
Answer» Answer is (d) 22 carat gold (it is an alloy so solid in solid solution)

Discussion

18.	A conductor has how many types of flow? a. 1 b, 2 c. 3 d. 4
Answer» The correct answer is: (a) 1

Discussion

19.	The boiling points of alcohols are higher than those of hydrocarbons of comparable masses due to: (a) Hydrogen bonding (b) Ion – dipole interaction (c) Dipole- dipole interaction (d) Van der Waal’s forces.
Answer» Answer is (a) Hydrogen bonding (alcohols form intermolecular hydrogen bonds)

Discussion

20.	The valence electron of a conductor is also called a a. Bound electron b. Free electron c. Nucleus d. Proton
Answer» (b) Free electron

Discussion

21.	The merging of a free electron and a hole is called a. Covalent bonding b. Lifetime c. Recommendation d. Thermal energy
Answer» (c) Recommendation

Discussion

22.	The amount of time between the creation of a hole and its disappearance is called a. Doping b. Lifetime c. Recombination d. Valence
Answer» (b) Lifetime

Discussion

23.	At room temperature an intrinsic silicon crystal acts approximately like a. A battery b. A conductor c. An insulator d. A piece of copper wire
Answer» (c) An insulator

Discussion

24.	If `xdy = y(dx + ydy); y(1) = 1 and y(x) > 0`, then what is `y(-3)` equal to?A. 1B. 3C. 5D. `-1`
Answer» Correct Answer - B

Discussion

25.	The point at which the line joining the points `(2, -3, 1) and (3, -4, -5)` intersects the plane `2x+y+z=7` isA. `(1, 2, 7)`B. ` (1, -2, 7)`C. ` (-1, 2, 7)`D. `(1, -2, -7)`
Answer» Correct Answer - B

Discussion

26.	Draw the graph of `f(x) =cot^(-1)((2-\|x\|)/(2+\|x\|))`.A. `f(x)` is bijectiveB. `f(x)` is continuous and differentiable in `(-2,2)`C. `f(x)` is even functionD. `underset(xto(2)/(sqrt(3)))(lim)f(x)=(5pi)/(12)`
Answer» Correct Answer - B::C::D `f(x)=(pi)/(2)-tan^(-1)((1-(\|x\|)/(2))/(1+(\|x\|)/(2)))=(pi)/(4)+tan^(-1)((\|x\|)/(2))`

Discussion

27.	if `A[{:(5,-3),(111,336):}]` and det`(-3A^(2013)+A^(2014))=alpha^(alpha)+beta^(2)(1+gamma+gamma^(2))` where `alpha,beta,gamma` are natural numbers and `(alphagtgammagtbeta)` thenA. `alpha+beta=2016`B. `alpha+beta=2023`C. `alpha+beta+gamma=2026`D. `beta+gamma=13`
Answer» Correct Answer - A::C::D `because-3A^(2013)+A^(2014)=A^(2013)(A-3I)` `becausedet(-3A^(2013)+A^(2014))=\|A^(2012)(A-3I)\|` `=\|A\|^(2013)\|A-3I\|=(2013)^(2013)(999)` `(2013)^(2013)3^(2)(1+10+10^(2))`

Discussion

28.	Comprehension2Considerthe system of linear equations `alphax+y+z=m x+alphay+z=n x+y+alphaz=p`If `alpha=1 & m!=p`then the system of linear equations has-a. no solution b. ` `infinite solutionsc. unique solution d. ` `unique solution `if p=n`A. The given system of equation has no solution if `alpha=-2` and `m+n+pne0`B. The give system of equation has no solution if `alpha=1` and `m ne n` or `n ne p` or `p ne m`C. The given system of equation has infinite solution if `alpha=-2` and `m+n+p=0`D. The given system of equation has unique solution if `alpha=1` or `-2`
Answer» Correct Answer - A::B::C `D\|{:(alpha,1,1),(1,alpha,1),(1,1,alpha):}\|=(alpha-1)^(2)(alpha+2)` `D_(1)=\|{:(m,1,1),(n,alpha,1),(p,1,alpha):}\|=(alpha-1)[m(alpha+1)-(n+p)]` `D_(2)=(alpha-1)[n(alpha+1)-(m+p)]` `D_(3)=(alpha-1)[p(alpha+1)-(m+n)]`

Discussion

29.	The system of equations `alphax+y+z=alpha-1, x+alphay+z=alpha-1, x+y+alphaz=alpha-1` has no solution if alpha is (A) 1 (B) not -2 (C) either -2 or 1 (D) -2A. Not - 2B. 1C. `-2`D. Either - 2 or 1
Answer» Correct Answer - C

Discussion

30.	Find the electric field due to an infinitely long cylindrical charge distribution of radius R and having linear charge density `lambda` at a distance half of the radius from its axis.
Answer» `r=R/2` point will be inside so `E=(2k lambda r)/(R^(2))=(2k lambda)/R^(2)(R/2)=lambda/(4pi in_(0)R)`

Discussion

31.	In the figure shown, an electric dipole is placed at a distance `x` from an infinitely long rod of linear charge density `lambda`. (`a`) Find the net force acting on the dipole ? (`b`) What is the work done in rotating the dipole through `180^(@)` ? (`c`) If the dipole is slightly rotated about its equilibrium position, find the time period of oscillation. Assume that the dipole is linearly restrained.
Answer» (`a`) The electric field at a distance `x` is `E=(lambda)/(2piepsilon_(0)x)` The net force on the dipole is `F=p(dE)/(dx)=(2a)q[(-lambda)/(2piepsilon_(0)x^(2))]=(-lambdaqa)/(piepsilon_(0)x^(2))` The negative sign indicates that the force is attractive. (`b`) `W=DeltaU` `U_(i)=-vecpvecE=-pEcos0^(@)=-pE` `U_(f)=-vecpvecE=-pEcos180^(@)=+pE` `W=2pE=2(2a)q(lambda)/(2piepsilon_(0)x)=(2lambdaqa)/(piepsilon_(0)x)` (`c`) Restoring torque `tau=-pEsintheta` `tau=I(d^(2)theta)/(dt^(2))=(2ma^(2))(d^(2)theta)/(dt^(2))` `:. 2ma^(2)(d^(2)theta)/(dt^(2))+[(lambdaqa)/(piepsilon_(0)x)]theta=0` or `(d^(2)theta)/(dt^(2))+[(lambdaq)/(2piepsilon_(0)max)]theta=0` `T=2pisqrt((2piepsilon_(0)max)/(lambdaq))=sqrt((8pi^(2)epsilon_(0)max)/(lambdaq))`

Discussion

32.	The SI unit of magnetic field intensity is(i) AmN-1(ii) NA-1m-1(iii) NA-2m-2(iv) NA-1m-2
Answer» Answer is (ii) NA^-1m^-1 We know \(B=\frac{F}{I1\,sin\theta}\) SI Unit of B = \(\frac{N}{Am}\) = NA^-1m^-1

32.

The SI unit of magnetic field intensity is(i) AmN-1(ii) NA-1m-1(iii) NA-2m-2(iv) NA-1m-2

Answer»

Answer is (ii) NA^-1m^-1

We know

\(B=\frac{F}{I1\,sin\theta}\)

SI Unit of B = \(\frac{N}{Am}\) = NA^-1m^-1

Discussion

33.	The coil of a moving coil galvanometer is wound over a metal frame in order to (i) reduce hysteresis (ii) increase sensitivity (iii) increase moment of inertia (iv) provide electromagnetic damping
Answer» Answer is (iv) provide electromagnetic damping The coil of a moving coil galvanometer is wound over metallic frame to provide electromagnetic damping so it becomes dead beat galvanometer.

33.

The coil of a moving coil galvanometer is wound over a metal frame in order to (i) reduce hysteresis (ii) increase sensitivity (iii) increase moment of inertia (iv) provide electromagnetic damping

Answer»

Answer is (iv) provide electromagnetic damping

The coil of a moving coil galvanometer is wound over metallic frame to provide electromagnetic damping so it becomes dead beat galvanometer.

Discussion

34.	The kind of oscillator found in an electronic wristwatch is the a. Armstrong b. Clapp c. Colpitts d. Quartz crystal
Answer» (d) Quartz crystal

Discussion

35.	Crystals have a very a. Low Q b. High Q c. Small inductance d. Large resistance
Answer» The answer is: (b) High Q

Discussion

36.	The series and parallel resonant frequencies of a crystal are a. Very close together b. Very far apart c. Equal d. Low frequencies
Answer» (a) Very close together

Discussion

37.	In the shown diagram two point masses m are joined by a massless rod of length 5.5m. The lower end of the mass sytem is dragged with constant velocity `V_(0)` rightwards the magnitude of velocity of centre of mass when `theta=37^(0)`, will beA. `(5v_(0))/(6)`B. `2v_(0)`C. `v_(0)sqrt(2)`D. `(6v_(0))/(5)`
Answer» Correct Answer - A `x^(2)+y^(2)=l^(2)` `(dy)/(dt)=-(x)/(y)((dx)/(dt))` if `theta=37^(@)` `(dy)/(dt)=-(x)/(y)(dx)/(dt)=-(4)/(3)v_(@)` `vecv_(cm)=(mv_(@)hati-m(4v_(@))/(3)haty)/(2m)` `\|vecV_(cm)\|=(5v_(@))/(6)`

Discussion

38.	List the disadvantages of using fossil fuels.
Answer» (i) Fossil fuels are formed from carbon and biomass which contains hydrogen, carbon, nitrogen and sulphur. (ii) When these are burnt, the products are oxides of carbon, water, oxides of nitrogen and oxides of sulphur. (iii) Oxides of nitrogen, oxides of sulphur and carbon monoxide are poisonous at high concentration. They may lead to acid rain. (iv) Carbon dioxide is a greenhouse gas. When its concentration in the atmosphere increases continuously, leads to intence global warming.

38.

List the disadvantages of using fossil fuels.

Answer»

(i) Fossil fuels are formed from carbon and biomass which contains hydrogen, carbon, nitrogen and sulphur.

(ii) When these are burnt, the products are oxides of carbon, water, oxides of nitrogen and oxides of sulphur.

(iii) Oxides of nitrogen, oxides of sulphur and carbon monoxide are poisonous at high concentration. They may lead to acid rain.

(iv) Carbon dioxide is a greenhouse gas. When its concentration in the atmosphere increases continuously, leads to intence global warming.

Discussion

39.	In the given circuit, the capacitor of capacitance C is charged by closing key K at t = 0. Find the time required to charge the capacitor up to the maximum charge for the given circuit, if it were to be charged with the charged with constant initial charging rate at `t = 0` in the given circuit. A. `RC//3`B. `2RC//5`C. `2RC//3`D. `5RC//3`
Answer» Correct Answer - D d. Initial charging rate = initial current in the line of capacitor = I `= 2E//5R`. Steady state pd across capacitor is `V_0 = 2/3 E or q_0 = CV_0 = 2/3 EC` `t = q_0/i = ((2//3)EC)/(2E//5R) = 5/3 RC`

Discussion

40.	Which pair has same or identical electron gain enthalpy? (a) Rb, Cs (b) I, At (c) Ar, Kr(d) Na, k
Answer» Correct option is (c) Ar, Kr Ar & Kr have same electron gain enthalpy of 96 kJ/mol

40.

Which pair has same or identical electron gain enthalpy? (a) Rb, Cs (b) I, At (c) Ar, Kr(d) Na, k

Answer»

Correct option is (c) Ar, Kr

Ar & Kr have same electron gain enthalpy of 96 kJ/mol

Discussion

41.	According to Joule’s law of heating, mention the factors on which heat produced in a resistor depends. According to this law write the formula used to calculate the heat produced.
Answer» Heat produced in a resistor is: (i) Directly proportional to the square of current for a given resistance (ii) Directly proportional to resistance for a given current, and (iii) Directly proportional to the time for which the current flows through the resistor (iv) H – I²Rt

41.

According to Joule’s law of heating, mention the factors on which heat produced in a resistor depends. According to this law write the formula used to calculate the heat produced.

Answer»

Heat produced in a resistor is:

(i) Directly proportional to the square of current for a given resistance

(ii) Directly proportional to resistance for a given current, and

(iii) Directly proportional to the time for which the current flows through the resistor

(iv) H – I²Rt

Discussion

42.	Which pair has same or identical electron gain enthalpy?(a) Rb, Cs(b) I, At(c) Ar, Kr(d) Na, k
Answer» (c) Ar, Kr Ar & Kr have same electron gain enthalpy of 96 kJ/mol

42.

Which pair has same or identical electron gain enthalpy?(a) Rb, Cs(b) I, At(c) Ar, Kr(d) Na, k

Answer»

(c) Ar, Kr

Ar & Kr have same electron gain enthalpy of 96 kJ/mol

Discussion

43.	A wire of length L and 3 identical cells of negligible internal resistance are connected in series. Due to the current, the temperature of the wire is raised by `DeltaT` in a time t. A number N of similar cells is now connected in series with a wire of the same material and cross-section but of length 2L. The temperature of the wire is raised by the same amount `DeltaT` in the same time t. the value of N isA. 4B. 5C. 8D. 6
Answer» Correct Answer - D d. `V^2/R t = ms DeltaT` For first case `: (3E)^2/(rhoL//A) t = ms DeltaT` For second case: `(NE)^2/(rho2L//A) t = 2msDeltaT`. Dividing, we get N = 6.

Discussion

44.	Correct statements for enzyme inhibitor drugs-I. They are competitive and non-competitive drugsII. They bind at active and allosteric sites III. Competitive drugs inhibits active siteIV. Non-competitive drugs inhibits allosteric sites(a) I and II(b) II and III(c) III and IV(d) All are correct
Answer» (d) All are correct Drugs compete with the natural substrate for their attachment on the active sites of enzymes. Such drugs are called competitive inhibitors Some drugs do not bind to the enzyme's active site. These bind to a different site of enzyme which is called allosteric site.

44.

Correct statements for enzyme inhibitor drugs-I. They are competitive and non-competitive drugsII. They bind at active and allosteric sites III. Competitive drugs inhibits active siteIV. Non-competitive drugs inhibits allosteric sites(a) I and II(b) II and III(c) III and IV(d) All are correct

Answer»

(d) All are correct

Drugs compete with the natural substrate for their attachment on the active sites of enzymes. Such drugs are called competitive inhibitors Some drugs do not bind to the enzyme's active site. These bind to a different site of enzyme which is called allosteric site.

Discussion

45.	What amount of heat will be generated in a coil resistance `R` due to a charge `q` passing through it if the current in the coil decreases down to zero uniformly during a time interval `Deltat` ?A. `4/3 (q^2R)/T`B. `1 n ((q^2R)/(2T))`C. `(2q^2R)/(3T)`D. `1 n ((2T)/(q^2R))`
Answer» Correct Answer - A a. `I = I_0 - kt, "at" t = T, I = 0 or k = I_0//T` So `I = I_0-I_0t//T, q = int_(0)^(T) Idt = I_(0) int_(0)^(T) (1- t/T) dt` or `q = (I_0T)/2 or I_0 = (2q)/T` Heat = `int_(0)^(T) I^(2) Rdt = I_(0)^(2)R int_(0)^(T) (1-t/T)^2 dt = (4q^2R)/(3T)` .

Discussion

46.	Consider the circuit shown in the figure. Find the charge on capacitor `C` between `A` and `D` in steady state. A. `C epsilon`B. `C epsilon//2`C. `Cepsilon//3`D. zero
Answer» Correct Answer - D d. In steady state, there will be no current in any branch. So A and D will be at the same potential. Hence, charge on capacitor between A and D will be zero.

Discussion

47.	A capacitor having initial charge `q_0 = CE//2` is connected to a cell of emf E through a resistor R as shown. Find the total heat generated in the circuit after the switch S is closed. A. `(1//12) CE^2`B. `(1//8)CE^2`C. `(1//4)CE^2`D. none of these
Answer» Correct Answer - B b. Final charge on capacitor `q_(f) = CE` Charge flown `= CE-CE//2 = CE//2` Work done by battery: `W_(b) = E(CE//2) = 1/2 CE^2` Change in energy of capacitor is `DeltaU = 1/(2C)[q_(f)^(2) - q_(0)^(2)]` ` = 1/(2C) [(CE)^2 - (CE//2)^2] = (3CE^2)/8` Heat `= W_(b) - Delta U = 1/8 CE^2` .

Discussion

48.	Drugs used to bind to receptors, inhibiting its natural function and blocking a message are called : (A) Agonists(B) Antagonists(C) Allosterists(D) Anti histaminists
Answer» Correct option is (B) Antagonists

Discussion

49.	(i) Give two advantages and two disadvantages of star topology OR Define the following terms: www , web hosting(ii) How is packet switching different from circuit switching?
Answer» (i) Advantages Ease of service Centralized control Easy to diagnose faults One device per connection Disadvantages long cable length difficult to expand central node dependency OR www: a set of protocols that allow you to access any document on the internet through the naming systems based on URLs Web hosting: Web hosting is a service that allows organizations and individuals to post a website or web page onto the server, which can be viewed by everyone on the Internet. (ii) Packet switching: uses store and forward concept to send messages no physical path is actually establishes message is divided into smaller parts, known as packets and then sent forward tight upper limit on block size Each data unit knows only the final receiver’s address Circuit switching : physical connection is established between sender and receiver Each data unit knows the entire path from sender to receiver It does not follow store and forward concept

49.

(i) Give two advantages and two disadvantages of star topology OR Define the following terms: www , web hosting(ii) How is packet switching different from circuit switching?

Answer»

(i) Advantages

Ease of service
Centralized control
Easy to diagnose faults
One device per connection

Disadvantages

long cable length
difficult to expand
central node dependency

OR

www: a set of protocols that allow you to access any document on the internet through the naming systems based on URLs

Web hosting: Web hosting is a service that allows organizations and individuals to post a website or web page onto the server, which can be viewed by everyone on the Internet.

(ii) Packet switching:

uses store and forward concept to send messages
no physical path is actually establishes
message is divided into smaller parts, known as packets and then sent forward
tight upper limit on block size
Each data unit knows only the final receiver’s address

Circuit switching :

physical connection is established between sender and receiver
Each data unit knows the entire path from sender to receiver
It does not follow store and forward concept

Discussion

50.	Drugs that inhibits natural functions(a) Agonist(b) Antagonist(c) Allosteric(d) Anti Histamines
Answer» (b) Antagonist Antagonist inhibits natural functions

50.

Drugs that inhibits natural functions(a) Agonist(b) Antagonist(c) Allosteric(d) Anti Histamines

Answer»

(b) Antagonist

Antagonist inhibits natural functions

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

What is the use of supplementary oil tank?

How dearator pressure is maintained?

What is the purpose of accelerator governer?

What is the use of jacking oil pump?

Explain the main difference between impulse and reaction turbine.

What is the purpose of turbine governing system?

What is the purpose of gland steam system?

`I v//s V` curve for a non Ohmic resistance is shown. The dynamic resistance is maximum at point A. `a`B. `b`C. `c`D. same for all

`I v//s V` curve for a non Ohmic resistance is shown. The dynamic resistance is maximum at point A. `a`B. `b`C. `c`D. same for all

What is the role of graphite rod in the electrometallurgy of aluminium ?

Give the oxidation state and coordination number of the central metal ion in the following complexes. (A) [Co(en)3]3+ (B) K4 [Fe(CN)6]

Why phenol are more acidic than alcohol ? Explain.

When a voltage is applied to a semiconductor, holes will flow a. Away from the negative potential b. Toward the positive potential c. In the external circuit d. None of the above

Arrange the following alcohols in increasing order of their reactivity towards esterification reaction. CH3 – CH2 – OH, (CH3)2 CH– OH, (CH3)3 C–OH

A semiconductor has how many types of flow? a. 1 b. 2 c. 3 d. 4

Why the boiling points of alcohols are higher than hydrocarbons and ether of comparable molecular mass ? Explain.

Which of the following is an example of a solid solution? (a) sea water (b) sugar solution (c) smoke (d) 22 carat gold

A conductor has how many types of flow? a. 1 b, 2 c. 3 d. 4

The boiling points of alcohols are higher than those of hydrocarbons of comparable masses due to: (a) Hydrogen bonding (b) Ion – dipole interaction (c) Dipole- dipole interaction (d) Van der Waal’s forces.

The valence electron of a conductor is also called a a. Bound electron b. Free electron c. Nucleus d. Proton

The merging of a free electron and a hole is called a. Covalent bonding b. Lifetime c. Recommendation d. Thermal energy

The amount of time between the creation of a hole and its disappearance is called a. Doping b. Lifetime c. Recombination d. Valence

At room temperature an intrinsic silicon crystal acts approximately like a. A battery b. A conductor c. An insulator d. A piece of copper wire

If `xdy = y(dx + ydy); y(1) = 1 and y(x) > 0`, then what is `y(-3)` equal to?A. 1B. 3C. 5D. `-1`

The point at which the line joining the points `(2, -3, 1) and (3, -4, -5)` intersects the plane `2x+y+z=7` isA. `(1, 2, 7)`B. ` (1, -2, 7)`C. ` (-1, 2, 7)`D. `(1, -2, -7)`

Draw the graph of `f(x) =cot^(-1)((2-|x|)/(2+|x|))`.A. `f(x)` is bijectiveB. `f(x)` is continuous and differentiable in `(-2,2)`C. `f(x)` is even functionD. `underset(xto(2)/(sqrt(3)))(lim)f(x)=(5pi)/(12)`

if `A[{:(5,-3),(111,336):}]` and det`(-3A^(2013)+A^(2014))=alpha^(alpha)+beta^(2)(1+gamma+gamma^(2))` where `alpha,beta,gamma` are natural numbers and `(alphagtgammagtbeta)` thenA. `alpha+beta=2016`B. `alpha+beta=2023`C. `alpha+beta+gamma=2026`D. `beta+gamma=13`

The system of equations `alphax+y+z=alpha-1, x+alphay+z=alpha-1, x+y+alphaz=alpha-1` has no solution if alpha is (A) 1 (B) not -2 (C) either -2 or 1 (D) -2A. Not - 2B. 1C. `-2`D. Either - 2 or 1

Find the electric field due to an infinitely long cylindrical charge distribution of radius R and having linear charge density `lambda` at a distance half of the radius from its axis.

The SI unit of magnetic field intensity is(i) AmN-1(ii) NA-1m-1(iii) NA-2m-2(iv) NA-1m-2

The coil of a moving coil galvanometer is wound over a metal frame in order to (i) reduce hysteresis (ii) increase sensitivity (iii) increase moment of inertia (iv) provide electromagnetic damping

The kind of oscillator found in an electronic wristwatch is the a. Armstrong b. Clapp c. Colpitts d. Quartz crystal

Crystals have a very a. Low Q b. High Q c. Small inductance d. Large resistance

The series and parallel resonant frequencies of a crystal are a. Very close together b. Very far apart c. Equal d. Low frequencies

List the disadvantages of using fossil fuels.

Which pair has same or identical electron gain enthalpy? (a) Rb, Cs (b) I, At (c) Ar, Kr(d) Na, k

According to Joule’s law of heating, mention the factors on which heat produced in a resistor depends. According to this law write the formula used to calculate the heat produced.

Which pair has same or identical electron gain enthalpy?(a) Rb, Cs(b) I, At(c) Ar, Kr(d) Na, k

Correct statements for enzyme inhibitor drugs-I. They are competitive and non-competitive drugsII. They bind at active and allosteric sites III. Competitive drugs inhibits active siteIV. Non-competitive drugs inhibits allosteric sites(a) I and II(b) II and III(c) III and IV(d) All are correct

What amount of heat will be generated in a coil resistance `R` due to a charge `q` passing through it if the current in the coil decreases down to zero uniformly during a time interval `Deltat` ?A. `4/3 (q^2R)/T`B. `1 n ((q^2R)/(2T))`C. `(2q^2R)/(3T)`D. `1 n ((2T)/(q^2R))`

Consider the circuit shown in the figure. Find the charge on capacitor `C` between `A` and `D` in steady state. A. `C epsilon`B. `C epsilon//2`C. `Cepsilon//3`D. zero

A capacitor having initial charge `q_0 = CE//2` is connected to a cell of emf E through a resistor R as shown. Find the total heat generated in the circuit after the switch S is closed. A. `(1//12) CE^2`B. `(1//8)CE^2`C. `(1//4)CE^2`D. none of these

Drugs used to bind to receptors, inhibiting its natural function and blocking a message are called : (A) Agonists(B) Antagonists(C) Allosterists(D) Anti histaminists

(i) Give two advantages and two disadvantages of star topology OR Define the following terms: www , web hosting(ii) How is packet switching different from circuit switching?

Drugs that inhibits natural functions(a) Agonist(b) Antagonist(c) Allosteric(d) Anti Histamines