100525 + Interview Questions in GENERAL QA IN GENERAL AWARENESS

1.	A resistance coil, connected to an external battery is placed inside an adiabatic cylinder filled with frictionless piston of mass `m` and containing an ideal gas. A current `i` flows through the coil, which has resistance `R`. The speed with which the piston must move in order to keep the temperature of the gas constant will be A. `i^(2)R//mg`B. `iR//mg`C. `0`D. Data is insufficient.
Answer» Applying `COE` `i^(2)Rt=mgx` `rArr (dx)/(dt)=(i^(2)R)/(mg)`

Discussion

2.	One mole of an ideal gas `(y=1.4)` at `500K`, is filled in an adiabatic cylinder. The piston is free to move against atmospheric pressure. A non-conducting fan is inserted into the gas space and rotated vigrously, so that the gas expands slowly, till its volume is double. Find work done by the fan in `KJ`. (Take `R=8 j//`mole. `k,` neglect heat capacity of the cylinder, piston and the fan).
Answer» Using `1st` law of `TD` `Q=W+Uuparrow` `0=((-W_(tan))+PDeltav)+n(f)/(2)RDeltaT` `W_(tan)=nRDeltaT+n(f)/(2)RDeltaT` `W_(tan)=nC_(P)DeltaT` `W_(tan)=(1)(R+(f)/(2)R)(k)` (as the gas is expending slowly so `p=` constant, so `Tpropv`) `W_(tan)=14 kj`

Discussion

3.	Two large non conducting plates having surface charge densities `+sigma` and `-sigma` respectively, are fixed `d` distnce apart. A small test charge `q` of mass `m` is attached to two non conducting springs each of spring constant `k` as shown in the figure. The sum of lengths of both springs in underformed state is `d`. The charge `q` is released from rest with both the springs nondeformed. then charge `q` will (neglect gravity) A. performs `SHM` with angular frequency `sqrt((2k)/(m))` and amplitude `(sigmaq)/(kepsilon_(0))`.B. perform `SHM` with angular freqeuncy `sqrt((2k)/(m))` and amplitude `(eq)/(2kepsilon_(0))`C. not perform `SHM`, but will execute periodic motion.D. remain stationary.
Answer» The electrostatic force on charge is constant, hence it does not effect the time period of spring `+` particle system. `therefore omega=sqrt((2K)/(m))` Initially the charge is at rest, i.e. at extreme position. The equilibrium position, shall be at a distance `A` towards right, where `A` (by definition) is amplitude of vibration. `therefore 2kA=(sigma)/(epsilon_(0))` or `A=(sigmaq)/(2kepsilon_(0))`

Discussion

4.	Choose the correct form of the verb that agrees with the subject:The nurse ...... (take/takes) the narrator through the vestibule into the hospital. The hospital ..... (was/were) a villa. The floors ...... (was/were) waxed and polished.
Answer» takes, was, were.

Discussion

5.	Would you go upstairs and ________ my handbag, please. A) take B) bring C) carry D) fetch E) obtain
Answer» Correct option is D) fetch

Discussion

6.	The marked price of a tunic and jeans are in a ratio of 1 : 2. The shopkeeper gives a 40% discount on the tunic. If the total discount on both is 30%, the discount offered on the jeans is?1. 35%2. 30%3. 20%4. 25%
Answer» Correct Answer - Option 4 : 25% Given: Marked price of tunic and jeans = 1 : 2 Discount on tunic = 40% Total discount = 30% Concept used: S.P = M.P × (100 – D%)/100 Calculations: Let the Marked Price of tunic be x Let the Marked Price of jeans be 2x. Let the discount on jeans be y% According to the question ⇒ (60/100) × x + ((100 – y)/100) × 2x = (70/100) × (x + 2x) ⇒ (3x/5) + (100 – y)x/50 = 21x/10 ⇒ (100 – y)x/50 = 3x/2 ⇒ (100 – y) = 75 ⇒ y = 100 – 75 ⇒ y = 25% ∴ The discount on jeans is 25%.

6.

The marked price of a tunic and jeans are in a ratio of 1 : 2. The shopkeeper gives a 40% discount on the tunic. If the total discount on both is 30%, the discount offered on the jeans is?1. 35%2. 30%3. 20%4. 25%

Answer» Correct Answer - Option 4 : 25%

Given:

Marked price of tunic and jeans = 1 : 2

Discount on tunic = 40%

Total discount = 30%

Concept used:

S.P = M.P × (100 – D%)/100

Calculations:

Let the Marked Price of tunic be x

Let the Marked Price of jeans be 2x.

Let the discount on jeans be y%

According to the question

⇒ (60/100) × x + ((100 – y)/100) × 2x = (70/100) × (x + 2x)

⇒ (3x/5) + (100 – y)x/50 = 21x/10

⇒ (100 – y)x/50 = 3x/2

⇒ (100 – y) = 75

⇒ y = 100 – 75

⇒ y = 25%

∴ The discount on jeans is 25%.

Discussion

7.	I am so ______. I want to sleep. A) asleep B) tired C) easy D) hard
Answer» Correct option is B) tired

Discussion

8.	We have to send the patients to hospital for ______. A) treatment B) nurse C) stomach-ache D) regular
Answer» Correct option is A) treatment

Discussion

9.	The doctor who does operations in the hospital is called ______. A) surgeon B) dentist C) nurse D) optician
Answer» Correct option is A) surgeon

Discussion

10.	Continue the logic list. Hospital, doctor, nurse, ______. A) vaccine B) cock C) cool D) officer
Answer» Correct option is A) vaccine

Discussion

11.	Continue the logic list. North, south, west, ______. A) best B) rest C) east D) test
Answer» Correct option is C) east

Discussion

12.	Continue the logic list. Sweater, boots, T-shirt, ______. A) hair B) face C) jeans D) clothes
Answer» Correct option is C) jeans

Discussion

13.	______ is a very high hill. A) cliff B) rock C) plateau D) mountain
Answer» Correct option is D) mountain

Discussion

14.	I can see the sunshine behind the ______. A) picture B) wall C) sofa D) curtains
Answer» Correct option is D) curtains

Discussion

15.	The water is stored in ______ before it is supplied to people’s houses. A) reservoir B) sea C) lake D) river
Answer» Correct option is A) reservoir

Discussion

16.	______ is a large area of salty water. A) waterfall B) lake C) reservoir D) sea
Answer» Correct option is D) sea

Discussion

17.	We always ______ at the hotel when we go abroad. A) be B) leave C) stay D) go
Answer» Correct option is C) stay

Discussion

18.	Continue the logic list. Valley, forest, mountain, ______. A) lake B) picture C) weather D) man
Answer» Correct option is A) lake

Discussion

19.	______ is place where water flows down over a rock or from a high place. A) lake B) sea C) waterfall D) river
Answer» Correct option is C) waterfall

Discussion

20.	Bob passes over the ______ on his way to school. A) road B) bridge C) waterfallD) farm
Answer» Correct option is B) bridge

Discussion

21.	\( \int \frac{x^{3}}{\left(x^{2}+1\right)^{3}} d x \)
Answer» \(\int \frac{x^3}{(x^2 + 1)^3 }dx = \int \frac{x^2.xdx}{(x^2 + 1)^3}\) \(1 + x^2 = t\) \(2xdx = dt\) \(xdx = \frac{dr}2\) \(\therefore \int \frac{x^3}{(x^2 + 1)^3}dx = \frac12 \int\frac{(t - 1)dt}{t^3}\) \( = \frac12 \int (t^{-2} - t^{-3} )dt\) \( =\frac12 \left(- \frac1t\ - \frac1{2t^2}\right)+ C\) \(= - \frac14 \left(\frac{2t + 1}{t^2}\right)+ C\) \(= - \frac14\left(\frac{2(1 + x^2)+1}{(1 +x^2)^2}\right)+ C\) \((\because t = 1 + x^2)\) \(= -\frac{2x^2 + 3}{4(1 + x^2)^2} + C\).

21.

\( \int \frac{x^{3}}{\left(x^{2}+1\right)^{3}} d x \)

Answer»

\(\int \frac{x^3}{(x^2 + 1)^3 }dx = \int \frac{x^2.xdx}{(x^2 + 1)^3}\)

\(1 + x^2 = t\)

\(2xdx = dt\)

\(xdx = \frac{dr}2\)

\(\therefore \int \frac{x^3}{(x^2 + 1)^3}dx = \frac12 \int\frac{(t - 1)dt}{t^3}\)

\( = \frac12 \int (t^{-2} - t^{-3} )dt\)

\( =\frac12 \left(- \frac1t\ - \frac1{2t^2}\right)+ C\)

\(= - \frac14 \left(\frac{2t + 1}{t^2}\right)+ C\)

\(= - \frac14\left(\frac{2(1 + x^2)+1}{(1 +x^2)^2}\right)+ C\) \((\because t = 1 + x^2)\)

\(= -\frac{2x^2 + 3}{4(1 + x^2)^2} + C\).

Discussion

22.	Evaluate : \( \int \frac{1-x^{2}}{x-2 x^{2}} d x \)
Answer» Let I be the given integral \(I=\int \frac {1-x^2}{x-2x^2} dx \) \(I=\int \frac {1-x^2}{x(1-2x)} dx\) This can be further solved by the method of partial fractions Let \(\frac{1-x^2}{x(1-2x)}\) be of the form \(\frac{A}{x} + \frac{Bx+C}{1-2x}\) where A,B and C are integers By taking the LCM and by comparing both the sides, we get A=1, B=-1,C=2 Now, the given integral is simplified and is written as, \(I=\int \frac{1}{x} dx + \int \frac {-x+2}{1-2x} dx\) \(I=log(x) + \int \frac{-x+2}{1-2x} dx\) The second integral should be written in the form n(Denominator) + m, where m and n are real numbers \(\therefore I=log(x) + 1/2 \int \frac {-2x+1+3}{-2x+1} dx\) \(I=log(x) +\int \frac {dx}{2} + \int \frac {3}{2(-2x+1)} dx\) \(I= log(x) + \frac {x}{2} - \frac{3}{4} log(1-2x) + c\) Hence the value of the given integral is \(I= \frac {x}{2} + log(x) - \frac {3}{4} log(1-2x) + c\)

22.

Evaluate : \( \int \frac{1-x^{2}}{x-2 x^{2}} d x \)

Answer»

Let I be the given integral

\(I=\int \frac {1-x^2}{x-2x^2} dx \)

\(I=\int \frac {1-x^2}{x(1-2x)} dx\)

This can be further solved by the method of partial fractions

Let \(\frac{1-x^2}{x(1-2x)}\) be of the form \(\frac{A}{x} + \frac{Bx+C}{1-2x}\) where A,B and C are integers

By taking the LCM and by comparing both the sides, we get

A=1, B=-1,C=2

Now, the given integral is simplified and is written as,

\(I=\int \frac{1}{x} dx + \int \frac {-x+2}{1-2x} dx\)

\(I=log(x) + \int \frac{-x+2}{1-2x} dx\)

The second integral should be written in the form n(Denominator) + m, where m and n are real numbers

\(\therefore I=log(x) + 1/2 \int \frac {-2x+1+3}{-2x+1} dx\)

\(I=log(x) +\int \frac {dx}{2} + \int \frac {3}{2(-2x+1)} dx\)

\(I= log(x) + \frac {x}{2} - \frac{3}{4} log(1-2x) + c\)

Hence the value of the given integral is \(I= \frac {x}{2} + log(x) - \frac {3}{4} log(1-2x) + c\)

Discussion

23.	Does the principle of conservation of energy hold for interference and diffraction phenomena? Explain briefly.
Answer» Yes law of conservation of energy is obeyed. In case of constructive interference, intensity becomes maximum and bright fringes are formed in the screen whereas in case of destructive interference, intensity being minimum, dark fringes are formed. This implies that in interference and diffraction pattern, the intensity of light is simply being redistributed i.e. energy is only transferred from dark to bright fringe and no energy is created or destroyed in the process.

Discussion

24.	Equation which measures alternating voltage is A. Vsin ω B. sin t C. Vo sinωt D. V=IR
Answer» The Correct option is C. V_o sinωt

Discussion

25.	Kinetic friction is always A. lesser than static friction B. greater than static friction C. equal to static friction D. equal to contact force
Answer» A. lesser than static friction

Discussion

26.	There are three equations of uniformly accelerated motion, the odd one out is A. final velocity = initial velocity + (acceleration × time) B. distance moved = (initial velocity × time) + (0.5 × acceleration × time2) C. final velocity2 = initial velocity2 + (2 × acceleration × distance moved) D. final velocity = initial velocity + (2 × acceleration × distance moved)
Answer» D. final velocity = initial velocity + (2 × acceleration × distance moved)

Discussion

27.	Ratio of voltages is inverse ratio of the A. transformer B. resistor C. iron core D. current
Answer» The Correct option is D. current.

Discussion

28.	Steady d.c voltage is also known as A. square velocity B. root mean square velocity C. root velocity D. velocity
Answer» B. root mean square velocity

Discussion

29.	If output voltage is greater than input voltage, then transformer is A. step up B. step down C. faulty D. fatal
Answer» The Correct option is A. step up

Discussion

30.	In transformer, alternating current is induced in A. primary coil B. secondary coil C. iron core D. resistor
Answer» B. secondary coil

Discussion

31.	Graph of alternating current is a A. cos wave B. tan wave C. curve D. sine wave
Answer» D. sine wave

Discussion

32.	High voltages lead to A. less power loss B. more power loss C. high current D. high resistance
Answer» A. less power loss

Discussion

33.	Ratio of voltages is equal to ratio of A. iron sheets in core B. coil C. number of turns in coil D. all of above
Answer» C. number of turns in coil

Discussion

34.	Process in which A.C is converted into D.C is calledA. inductionB. rectification C. inversion D. dispersion
Answer» B. rectification

Discussion

35.	In order to keep a body moving in a circle, there exists a force on it that is directed toward the center of the circle. This force is known as A. Centrifugal force B. Centripetal force C. Gravitational Force D. magnetic force
Answer» B. Centripetal force

Discussion

36.	If charge is placed at infinity, it's potential is A. zero B. infinite C. 1 D. -1
Answer» The Correct option is A. zero

Discussion

37.	Speed of stationary waves is A. 1 m s-1 B. 2 m s-1 C. 3 m s-1 D. zero
Answer» The Correct option is D. zero

Discussion

38.	If frequency of certain wave is f, then it's velocity is A. v = fλ B. v = T⁄λ C. T2 D. 1 ⁄T2
Answer» The Correct option is A. v = fλ

Discussion

39.	In the formation of stationary waves, at T⁄2 the waves are A. out of phase B. in phase C. diminished D. twice the amplitude
Answer» B. in phase.

Discussion

40.	On all instruments like measuring cylinder, pipette and burette, readings are always taken at the bottom of the meniscus of liquid. This is not true for liquids like A. Oil B. Ink C. Mercury D. Seawater
Answer» The Correct option is C. Mercury.

Discussion

41.	For a given system, the minimum frequency of a standing wave is in a A. fundamental mode B. lowest mode C. highest mode D. peak mode
Answer» A. fundamental mode

Discussion

42.	Gravitational potential is always A. positive B. negative C. zero D. infinity
Answer» B. negative.

Discussion

43.	A node having twice the frequency of the fundamental is called A. half harmonic B. harmonic C. double harmonic D. triple harmonic
Answer» B. harmonic.

Discussion

44.	In an electric field, energy per unit positive charge is A. voltage B. current C. frequencyD. resistance
Answer» The Correct option is A. voltage.

Discussion

45.	In Kundt's dust tube, dust accumulates at A. nodes B. antinodes C. at the end D. at troughs only
Answer» The Correct option is A. nodes

Discussion

46.	Centripetal force is dependent on three factors, the odd one out of these factors is A. Mass of the rotating object B. Speed of the rotating object C. Volume of the rotating object D. Path radius
Answer» C. Volume of the rotating object

Discussion

47.	A vector quantity is one which has A. direction as well as magnitude B. magnitude only C. direction only D. no direction, no magnitude
Answer» A. direction as well as magnitude

Discussion

48.	Graph of potential energy against distance is A. curve B. parabolic C. hyperbolic D. straight line
Answer» D. straight line

Discussion

49.	According to Newton's law of universal gravitation, any two particles of finite mass attract one another with a force which is A. Inversely proportional to the product of their masses and directly proportional to the square of their distance apart B. Inversely proportional to the product of their masses and directly proportional to their distance apart C. Directly proportional to the product of their masses and inversely proportional to their distance apart D. Directly proportional to the product of their masses and inversely proportional to the square of their distance apart
Answer» D. Directly proportional to the product of their masses and inversely proportional to the square of their distance apart

Discussion

50.	In a weather map, lines joining all those regions with same atmospheric pressure are called A. Bars B. Millibars C. Isobars D. Atmospheric bars
Answer» The Correct option is C. Isobars

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Choose the correct form of the verb that agrees with the subject:The nurse ...... (take/takes) the narrator through the vestibule into the hospital. The hospital ..... (was/were) a villa. The floors ...... (was/were) waxed and polished.

Would you go upstairs and ________ my handbag, please. A) take B) bring C) carry D) fetch E) obtain

The marked price of a tunic and jeans are in a ratio of 1 : 2. The shopkeeper gives a 40% discount on the tunic. If the total discount on both is 30%, the discount offered on the jeans is?1. 35%2. 30%3. 20%4. 25%

I am so ______. I want to sleep. A) asleep B) tired C) easy D) hard

We have to send the patients to hospital for ______. A) treatment B) nurse C) stomach-ache D) regular

The doctor who does operations in the hospital is called ______. A) surgeon B) dentist C) nurse D) optician

Continue the logic list. Hospital, doctor, nurse, ______. A) vaccine B) cock C) cool D) officer

Continue the logic list. North, south, west, ______. A) best B) rest C) east D) test

Continue the logic list. Sweater, boots, T-shirt, ______. A) hair B) face C) jeans D) clothes

______ is a very high hill. A) cliff B) rock C) plateau D) mountain

I can see the sunshine behind the ______. A) picture B) wall C) sofa D) curtains

The water is stored in ______ before it is supplied to people’s houses. A) reservoir B) sea C) lake D) river

______ is a large area of salty water. A) waterfall B) lake C) reservoir D) sea

We always ______ at the hotel when we go abroad. A) be B) leave C) stay D) go

Continue the logic list. Valley, forest, mountain, ______. A) lake B) picture C) weather D) man

______ is place where water flows down over a rock or from a high place. A) lake B) sea C) waterfall D) river

Bob passes over the ______ on his way to school. A) road B) bridge C) waterfallD) farm

\( \int \frac{x^{3}}{\left(x^{2}+1\right)^{3}} d x \)

Evaluate : \( \int \frac{1-x^{2}}{x-2 x^{2}} d x \)

Does the principle of conservation of energy hold for interference and diffraction phenomena? Explain briefly.

Equation which measures alternating voltage is A. Vsin ω B. sin t C. Vo sinωt D. V=IR

Kinetic friction is always A. lesser than static friction B. greater than static friction C. equal to static friction D. equal to contact force

Ratio of voltages is inverse ratio of the A. transformer B. resistor C. iron core D. current

Steady d.c voltage is also known as A. square velocity B. root mean square velocity C. root velocity D. velocity

If output voltage is greater than input voltage, then transformer is A. step up B. step down C. faulty D. fatal

In transformer, alternating current is induced in A. primary coil B. secondary coil C. iron core D. resistor

Graph of alternating current is a A. cos wave B. tan wave C. curve D. sine wave

High voltages lead to A. less power loss B. more power loss C. high current D. high resistance

Ratio of voltages is equal to ratio of A. iron sheets in core B. coil C. number of turns in coil D. all of above

Process in which A.C is converted into D.C is calledA. inductionB. rectification C. inversion D. dispersion

In order to keep a body moving in a circle, there exists a force on it that is directed toward the center of the circle. This force is known as A. Centrifugal force B. Centripetal force C. Gravitational Force D. magnetic force

If charge is placed at infinity, it's potential is A. zero B. infinite C. 1 D. -1

Speed of stationary waves is A. 1 m s-1 B. 2 m s-1 C. 3 m s-1 D. zero

If frequency of certain wave is f, then it's velocity is A. v = fλ B. v = T⁄λ C. T2 D. 1 ⁄T2

In the formation of stationary waves, at T⁄2 the waves are A. out of phase B. in phase C. diminished D. twice the amplitude

On all instruments like measuring cylinder, pipette and burette, readings are always taken at the bottom of the meniscus of liquid. This is not true for liquids like A. Oil B. Ink C. Mercury D. Seawater

For a given system, the minimum frequency of a standing wave is in a A. fundamental mode B. lowest mode C. highest mode D. peak mode

Gravitational potential is always A. positive B. negative C. zero D. infinity

A node having twice the frequency of the fundamental is called A. half harmonic B. harmonic C. double harmonic D. triple harmonic

In an electric field, energy per unit positive charge is A. voltage B. current C. frequencyD. resistance

In Kundt's dust tube, dust accumulates at A. nodes B. antinodes C. at the end D. at troughs only

Centripetal force is dependent on three factors, the odd one out of these factors is A. Mass of the rotating object B. Speed of the rotating object C. Volume of the rotating object D. Path radius

A vector quantity is one which has A. direction as well as magnitude B. magnitude only C. direction only D. no direction, no magnitude

Graph of potential energy against distance is A. curve B. parabolic C. hyperbolic D. straight line

In a weather map, lines joining all those regions with same atmospheric pressure are called A. Bars B. Millibars C. Isobars D. Atmospheric bars