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This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 801. |
In an AC circuit, resistance 50 Ω, inductance 0.3 H and capacitance 15 μF is connected to an AC voltage source 25 V, 50 Hz. Determine the impedance in the circuit.(a) 110 ohm(b) 100 ohm(c) 125 ohm(d) 140 ohm |
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Answer» The correct answer is (c) 125 ohm Explanation: Z^2 = R^2+(XL-XC)^2, XL=2πfL, XC=1/(2πfC) f=50Hz and L=0.3H and C=15 μF XL=2π(50)(0.3)= 94.25 ohm . XC=1/(2π*50*15*10^-6) = 212.21 ohm. Z^2=50^2+(212.21-94.25)^2=15625 Z = 125 ohm. |
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| 802. |
What is the relation between reactance, resistance and impedance?(a) Z=R+jX(b) Z=R+X(c) Z=R-X(d) Z=R-jX |
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Answer» Correct choice is (a) Z=R+jX The best explanation: The combination of resistance and reactance is known as impedance. Z=R+jX Where Z is impedance, R is resistance and X is reactance. |
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| 803. |
If the current and voltage are 90 degrees out of phase, the power factor will be?(a) 0(b) Infinity(c) 1(d) Insufficient information provided |
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Answer» Right choice is (a) 0 To explain I would say: The power factor is the cosine of the angle between the voltage and the current. If the angle between the voltage and the current is 90, then cos90=0. Hence, the power factor is zero. |
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| 804. |
If the power factor is 1/10 and the value of impedance is 20 ohm, calculate the resistance in the circuit.(a) 1 ohm(b) 2 ohm(c) 3 ohm(d) 4 ohm |
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Answer» The correct choice is (b) 2 ohm To explain I would say: We know that: cos(ϕ)=R/Z R=Z cos(ϕ) = 20/10 = 2 ohm. |
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| 805. |
If source impedance is a complex number Z, then load impedance is equal to _________(a) Z’(b) -Z(c) -Z’(d) Z |
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Answer» Right choice is (a) Z’ The explanation: When Source impedance is equal to Z, its load impedance is the complex conjugate of Z which is Z’. Only under this condition, maximum power can be drawn from the circuit. |
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| 806. |
In a pure inductive circuit, the power factor is __________(a) Maximum(b) Minimum(c) 0(d) Infinity |
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Answer» Correct option is (c) 0 Explanation: In a pure inductive circuit, the current is lagging by 90 degrees from the voltage. The power factor is the cosine of the angle between the voltage and the current. If the angle between the voltage and current is 90, then cos90=0. Hence, the power factor is zero. |
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| 807. |
The maximum power is delivered to a circuit when source resistance is __________ load resistance.(a) Greater than(b) Equal to(c) Less than(d) Greater than or equal to |
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Answer» The correct choice is (b) Equal to Easiest explanation: The circuit can draw maximum power only when source resistance is equal to the load resistance. |
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| 808. |
Calculate the Norton resistance for the following circuit if 5 ohm is the load resistance.(a) 10 ohm(b) 11 ohm(c) 12 ohm(d) 13 ohm |
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Answer» Correct option is (c) 12 ohm For explanation: Shorting all voltage sources and opening all current sources we have: RN=(3||6)+10 = 12 ohm. |
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| 809. |
Which of the following terms is modified in the integrated energy balance equation for non-uniform velocity distribution?(a) Potential energy(b) Kinetic energy(c) Pressure energy(d) Thermal energy |
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Answer» Right answer is (b) Kinetic energy Easiest explanation: The non-uniform velocity distribution can be accounted for by modifying the kinetic energy term in the integrated energy balance equation by replacing the (velocity)² term by v̅²/β, where v̅ is the average velocity and β is a constant. β is equal to 0.5 for laminar flow and 1 for turbulent flow in a circular conduit. |
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| 810. |
Name some devices where maximum power has to be transferred to the load rather than maximum efficiency.(a) Amplifiers(b) Communication circuits(c) Both amplifiers and communication circuits(d) Neither amplifiers nor communication circuits |
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Answer» Right choice is (c) Both amplifiers and communication circuits The best explanation: Maximum power transfer to the load is preferred over maximum efficiency in both amplifiers and communication circuits since in both these cases the output voltage is more than the input. |
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| 811. |
Which of the following furnaces is used for the directional solidification of cast ingots of eutectic?(a) Pneumatic zone furnace(b) Cupola furnace(c) Hydraulic zone furnace(d) Optical floating zone furnace |
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Answer» Correct answer is (d) Optical floating zone furnace Explanation: The drop cast ingots are directionally solidified using an optical floating zone furnace, in which radiation is emitted from a xenon lamp and focused on the specimens enclosed in a quartz tube which is basically evacuated first and back filled with the argon gas. And then drop-cast rods are used as the feed material for the performing of other operations. |
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| 812. |
Which of the following diffuse faster state and which is the slowest? solid, liquid, gas give reason for your answer |
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Answer» The gas diffuse fastest and solid slowest. Why : There are two reasons to it One the intermolecular force of attraction in gases is very less in comparison to liquids and solid. This is maximum in case of solids. The other is very high kinetic energy of gas molecules than particles of solid. This again is due to low intermolecular forces and large space between two particles. Thus gas diffuse faster than liquids and later diffuse faster than solids. |
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| 813. |
A body travels 200 cm in the first two seconds and 220 cm in the next 4 seconds with deceleration. the velocity of the body at the end of the `7^(th)` second is |
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Answer» Correct Answer - `10cms^(-1)` Let `u` be initial velocity `&a ` be its acceleration Distance in first `2 sec =S_(1)=200cm` `rArr u(2)+(1)/(2)a(2)^(2)=200cm` `rArr u+a=100` ...`(i)` Distance in next `4 sec. =S_(2)=220cm` Distance in first `6 sec. =S_(1)+S_(2)=200+220cm` `rArru(6)+(1)/(2)a(6)^(2)=420` `rArr u+3a=70` ....`(ii)` From equations `(i) & (ii), ` we get `a=-15cm//s^(2),u=115 cm//s` Hence, velocity at the end of `7 sec.` from start `=u+7a` `=115+7(-15)=10cm//s`. |
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| 814. |
‘These people have learned not from books ’ How did they learn then? |
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Answer» They learned from the fields, woods, riverbanks, birds, the sun, etc. In short, they learned everything from nature. |
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| 815. |
A man generates a symmetrical pulse in a string by moving his hand up and down. At t = 0, the point in his hand moves downwards from mean position. The pulse travels with speed `3m//s` on the string and his hand passes 6 times in each second from the mean position. Then, the point on the string at a distance 3 m will reach its upper extreme first time at t =A. 1.25 secB. 1 secC. `13/12` secD. none |
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Answer» Correct Answer - A or C or D `f=3 Hz " " rArr T=1/3 sec` `lambda=1m` His hand at upper extreme at `(3T)/4=1/4` sec This message reaches x=3 at t=1 sec. later. `rArr 1.25 sec` |
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| 816. |
The moment of inertia of a solid flywheel about its axis is `0.1 kg-m^(2)`.A tangential force of 2 kg-wt. is applied round the circumference of the flywheel with the help of a string and mass arrangement as shown in the figure. If the radius of the wheel is 0.1 m, find the acceleration `("in rad/sec"^(2))` of the mass : A. 163.3B. 16.3C. 81.66D. 8.16 |
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Answer» Correct Answer - B `a=(m"g")/(m+I//r^(2))=(19.6)/12` `alpha=a/R="16.33 "rad//s^(2)` |
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| 817. |
The electric field intensity due to a thin infinity long straight wire of uniform linear charge density `lambda` at O is- A. `(lambda)/(2pi epsilon_(0)R)`B. `(lambda sqrt(2))/(2pi epsilon_(0)R)`C. `(lambda sqrt(5))/(2pi epsilon_(0)R)`D. zero |
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Answer» Correct Answer - A `E_(arc) = (2k lambda)/(r) sin.(theta)/(2)` `=(2k lambda)/(r) sin.(180^(@))/(2)` `= (lambda)/(2pi epsilon_(0)R)` |
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| 818. |
Statement I: When air between the plates of a parallel plate condenser is replaced by an insulating dielectric medium, its capacity decreases. Statement II: Electric field intensity between the plates with dielectric in between is reduced.A. Statement I is true, Statement II is True, Statement II is a correct explanation for statement I.B. Statement I is true, Statement II is True, Statement II is Not a correct explanation for statement I.C. Statement I is True, Statement II is False.D. Statement I is False, Statement II is True. |
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Answer» Correct Answer - D Capacitance increase and electric field decreaes. |
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| 819. |
A flat coil of area A and n turns is placed at the centre of a ring fo radius `r(r^(2)gtgtA)` and resistance R. The coil and the ring are coplaner. When the current in the coil increases from zero to `i` , the total charge circulating in the ring isA. `(mu_(0)nAi)/(2rR)`B. `(mu_(0)nAi)/(r^(2)R)`C. `(mu_(0)nAi)/(2piR)`D. `(mu_(0)n^(2)i)/(4pirR)` |
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Answer» Correct Answer - A |
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| 820. |
A satellite is in a circular orbit very close to the surface of a planet. At some point it is given an impulse along its direction of motion, causing its velocity to increase `n` times . It now goes into an elliptical orbit. The maximum possible value of `n` for this to occur isA. 2B. `sqrt(2)`C. `sqrt(2)+1`D. `(1)/(sqrt(2)-1)` |
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Answer» Correct Answer - B |
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| 821. |
STATEMENT-1: Any process which occurs very rapidly is likely to be adiabatic. STATEMENT-2: Exchange of heat between a system and its surroundings is not instantaneous. (a) Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1. (b) Statement-1 is True, Statement-2 is True; Statement-2 is not a correct explanation for Statement-1. (c) Statement-1 is True, Statement-2 is False. (d) Statement-1 is False, Statement-2 is True. |
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Answer» Correct Answer is: (a) Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1. |
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| 822. |
A string of length l, fixed at both ends, vibrates in its fundamental mode. Transverse waves can travel along the string with a velocity V. Sound waves travel in air with a velocity v. The wavelength, in air, of the sound produced by the string is(a) 2lv/v(b) 2lV/v(c) lV/v(d) 2l |
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Answer» Correct Answer is;(a) 2lv/v The frequency of sound emitted is n = V/2l. The wavelength of sound in air is v/n = 2lv/V. |
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| 823. |
A person vibrates the end of a string sending transverse waves down the string. If the person then doubles the frequency at which he vibrates the string, the speed of the wavesA. doubles and the wavelength doubledB. doubles while the wavelength is halvedC. is unchanged while the wavelength is doubledD. is unchanged while the wavelength is halved. |
| Answer» The wave speed depends on factors on factors of tension in the string and its composition. Hence, since the wave speed is unchanged, with an increased frequency, there is a decreased wavelength `(v=flambda)` | |
| 824. |
A boy plucks at the centre of a stretched string of length 1 m and abserves a wave pattern.1. Which type of wave is produced on the string?2. What are the conditions for the formation of the above mentioned wave?3. The distance between consecutive nodes isλλ/22λλ/44. A steel rod100 cm long is clamped at its middle. The fundamental frequency of longitudiral vibrations of the rod is given to be 2.5kHz. What is the speed of sound in steel? |
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Answer» 1. Standing wave (or) stationary wave 2. Same frequency, same amplitude, travelling in opposite direction. 3. λ/2 4. Length of the rod l = \(\frac{λ_1}{2}\) λ1 = 2l =2m v = ν1λ1 v = 2500 × 2 = 5000 m/s. |
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| 825. |
1. Waves are means of transferring energy from one point to another. Distinguish between longitudinal and transverse waves.2. What is a plane progressive wave? Arrive at an expression for the displacement of a particle on the path of the wave, advancing in the positive x-direction.3. The velocity of sound is greater in solids than in gases. Explain. |
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Answer» 1.
2. Out of syllabus 3. Solids are highly elastic as compared to liquids and gases. |
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| 826. |
Ratio of tensile to strain is A. Young's modulus B. stress C. stiffness D. tensile force |
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Answer» A. Young's modulus |
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| 827. |
Stress is force applied on A. volume B. cross sectional area C. unit length D. across diagonal |
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Answer» B. cross sectional area |
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| 828. |
If a force of 50 N is applied across the cross-sectional area of 5 × 10- 7m2 then stress applied on it is A. 1 × 108 Pa B. 20 Pa C. 50 Pa D. 100 Pa |
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Answer» The Correct option is A. 1 × 108 Pa |
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| 829. |
Units of strain are A. Newton B. Joules C. Watt D. no units |
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Answer» The Correct option is D. no units |
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| 830. |
A ball is dropped from the top of a building. The ball takes 0.5s to fall past the 3m height of a window some distance from the top of the building. If the speed of the ball at the top and at the bottom of the window are VT and VB respectively then PLEASE GIVE DETAILED SOLUTION OF THE D3QUESTION IN THE ATTATCHMENT |
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Answer» A ball is dropped from the top of a building. The ball takes 0.5s to fall past the 3m height of a window som e distance from top of the building If the speeds are of the ball at top and bottom of the window are VT and VB respectively then (g=9.8m/s^2 As acceleration due to gravity g=9.8m/s^2 We can write VB=VT+ gt => VB- VT = 9.8x0.5 =5=4.9m/s .....(1) VB^2-VT^2=2*g*3=2*9.8*3.....(2) Dividing (2) by(1) we get VB+VT =(2*9.8*3)/(4.9)=12m/s Hence correct option is (A) We have given, the speed of the ball at the top of the window = VT and and the speed of the ball at the bottom of the window = VB The acceleration we know is ‘g’, g = 9.8 m/s The me taken to cross the window, t =0.5 s and the length of the window is S = 3 m. We have, V2-U2 = 2g(3) also, V = U+g(0.5) i.e VB-VT = 0.5g (VB+VT)(VB-VT) = 6g (VB+VT)(0.5g) = 6g VB+VT = 12 m/s, VT-VB = -4.9 m/s So option (A) is correct i.e VB+VT = 12 m/s |
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| 831. |
Coolant is circulated around the engine to prevent __________. |
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Answer» Coolant is circulated around the engine to prevent overheating. |
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| 832. |
Her hands are dirty. She’d ______ a bar of soap. A) like B) likes C) to like D) liked |
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Answer» Correct option is A) like |
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| 833. |
_______ best is riding horses. A) She likes B) That she likes C) What she liked D) What she likes |
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Answer» Correct option is D) What she likes |
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| 834. |
If grades are going to be given to students for their reports, it is suggested that these _______ for expression and use of language. A) given B) to be given C) are given D) be given |
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Answer» Correct option is D) be given |
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| 835. |
During what month do people sleep the least? |
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Answer» February, it's the shortest month after all. |
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| 836. |
What are the categories of Improvised Explosive Devices? |
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Answer» The Improvised Explosive Devices (IED) is of three categories. 1. Package type IED 2. Vehicle borne IED 3. Suicide bomb IED |
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| 837. |
What kind of room has no doors or windows? |
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Answer» Answer: A mushroom |
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| 838. |
Which factors would you keep in mind while conducting a security survey of the perimeter of premises? |
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Answer» The following factors will be kept in mind while conducting security survey of a perimeter of premises: 1. Length of the perimeter 2. State of perimeter protection – open, barbed wire fence, walled, etc. 3. Cover and dead ground along the perimeter 4. Access points along the perimeter and their access control 5. Security system along the perimeter – light, watch tower, CCTV camera, sensors, etc. 6. Security personnel deployment on perimeter protection 7. Communication system for security 8. System of response to perimeter breech 9. Perimeter patrolling |
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| 839. |
What is the center of gravity? |
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Answer» Answer: 'V' is the right answer |
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| 840. |
Describe the circumstances in which frisking of a person entering or exiting from a premises by Security Guards is justified. |
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Answer» The following circumstances under which frisking by a security guard is justified: 1. Organisation's standard security procedure 2. Inside a high security premises 3. On suspicion 4. On receiving a positive information or input from source or security equipment. |
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| 841. |
What's orange and sounds like a parrot? |
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Answer» Answer: A carrot! |
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| 842. |
Write down the components of a computer network established between the two offices of a company across the cities. |
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Answer» The five components will be involved in this computer network, since telephone lines will be used as communication channel. 1. Sender 2. Data communication device at sender’s end 3. Communication channel 4. Data communication device at receiver’s end 5.Receiver |
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| 843. |
What stays where it is when it goes off? |
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Answer» Answer: An alarm clock. |
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| 844. |
What jumps higher than a building? |
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Answer» Answer: Everything, buildings don't jump. |
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| 845. |
Mr. Smith liked his ___ son than others. A) older B) elder C) the oldest D) all E) the eldest |
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Answer» Correct option is B) elder |
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| 846. |
Mr. Smith has two children. If the older child is a boy, what are the odds that the other child is also a boy? |
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Answer» Answer: 50 percent. |
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| 847. |
A famous Disney movie partially takes place in this city? London, New York, Rio de Janeiro, Sydney |
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Answer» The "correct" answer is Sydney. |
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| 848. |
What do you mean by window Dressing ? |
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Answer» Some of the companies display their financial statements on window dressing so as a better picture of their financial strength and profitability of strength one ought to remain cautious, because on the basis of such ratio-projection the correct decision can not be taken since the exterior concerns find it difficult to believe this window dressing. |
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| 849. |
Which conventions, prevent window dressing. a. Conservation b. Full disclosure c. Consistency d. Materiality |
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Answer» Answer: Full Disclosure |
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| 850. |
Hydrogels are similar to natural tissues |
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Answer» A hydrogel is a three-dimensional (3D) network of hydrophilic polymers that can swell in water and hold a large amount of water while maintaining the structure due to chemical or physical cross-linking of individual polymer chains. |
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