Basic Science & Engineering Quiz For RRB Stage II : 15th January 2019

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Q1. A point is in 2nd quadrant, 15 units away from the vertical plane, 10 units away from the horizontal plane and 8 units away from the profile plane. Orthographic projection is drawn. What is the distance from point of front view to point of top view? / рдПрдХ рдмрд┐рдВрджреБ рджреВрд╕рд░реЗ рдЪрддреБрд░реНрдерд╛рдВрд╢ рдореЗрдВ рд╣реИ, рдКрд░реНрдзреНрд╡рд╛рдзрд░ рд╡рд┐рдорд╛рди рд╕реЗ 15 рдпреВрдирд┐рдЯ рджреВрд░, рдХреНрд╖реИрддрд┐рдЬ рд╡рд┐рдорд╛рди рд╕реЗ 10 рдпреВрдирд┐рдЯ рдФрд░ рдкреНрд░реЛрдлрд╝рд╛рдЗрд▓ рд╡рд┐рдорд╛рди рд╕реЗ 8 рдпреВрдирд┐рдЯ рджреВрд░ рд╣реИред рдСрд░реНрдереЛрдЧреНрд░рд╛рдлрд┐рдХ рдкреНрд░реЛрдЬреЗрдХреНрд╢рди рдЦреАрдВрдЪрд╛ рдЧрдпрд╛ рд╣реИред рд╢реАрд░реНрд╖ рджреГрд╢реНрдп рдХреЗ рдмрд┐рдВрджреБ рд╕реЗ рд╢реАрд░реНрд╖ рджреГрд╢реНрдп рдХреА рджреВрд░реА рдХреНрдпрд╛ рд╣реИ?
(a) 5
(b) 2
(c) 7
(d) 8

Ans.(c)
S1. Ans.(a)
Sol. As the point is in 2nd quadrant while drawing the projections the planes should rotate along the hinges such that the plane with top view overlaps the front view. So, the distance between them is difference of distances from respective planes that is 5 (15-10) here.

Q2. An ideal diode
рдПрдХ рдЖрджрд░реНрд╢ рдбрд╛рдпреЛрдб
(a) Should have zero resistance in the forward bias and zero resistance in the reverse bias/ рдлреЙрд░рд╡рд░реНрдб рдмрд╛рдпрд╕ рдореЗрдВ рдкреНрд░рддрд┐рд░реЛрдз рд╢реВрдиреНрдп рддрдерд╛ рд░рд┐рд╡рд░реНрд╕ рдмрд╛рдпрд╕ рдореЗрдВ рдкреНрд░рддрд┐рд░реЛрдз рд╢реВрдиреНрдп рд╣реЛрдирд╛ рдЪрд╛рд╣рд┐рдП
(b) Should have infinite large resistance in the reverse bias / рд░рд┐рд╡рд░реНрд╕ рдмрд╛рдпрд╕ рдореЗрдВ рдЕрдирдВрдд рдЕрдзрд┐рдХ рдкреНрд░рддрд┐рд░реЛрдз рд╣реЛрдирд╛ рдЪрд╛рд╣рд┐рдП
(c) Should have zero resistance in the forward bias and an infinitely large resistance in the reverse bias / рдлреЙрд░рд╡рд░реНрдб рдмрд╛рдпрд╕ рдореЗрдВ рд╢реВрдиреНрдп рдкреНрд░рддрд┐рд░реЛрдз рдФрд░ рд░рд┐рд╡рд░реНрд╕ рдмрд╛рдпрд╕ рдореЗрдВ рдПрдХ рдЕрд╕реАрдо рд░реВрдк рд╕реЗ рдЕрдзрд┐рдХ рдкреНрд░рддрд┐рд░реЛрдз рд╣реЛрдирд╛ рдЪрд╛рд╣рд┐рдП
(d) None of these/рдЗрдирдореЗрдВ рд╕реЗ рдХреЛрдИ рдирд╣реАрдВ

S2. Ans.(c)
Sol. An ideal diode is a diode that acts like a perfect conductor when voltage is applied forward biased and like a perfect insulator when voltage is applied reverse biased. So, when positive voltage is applied across the anode to the cathode, the diode conducts forward current instantly.

Q3. When will capacitor fully charged?
рд╕рдВрдзрд╛рд░рд┐рддреНрд░ рдкреВрд░реА рддрд░рд╣ рд╕реЗ рдЪрд╛рд░реНрдЬ рдХрдм рд╣реЛрдЧрд╛?
(a) When the voltage across its plates is half the voltage from ground to one of its plates/ рдЬрдм рдЗрд╕рдХреА рдкреНрд▓реЗрдЯреЛрдВ рдореЗрдВ рд╡реЛрд▓реНрдЯреЗрдЬ, рдЬрдореАрди рд╕реЗ рдЗрд╕рдХреА рдкреНрд▓реЗрдЯреЛрдВ рд╕реЗ рдЖрдзреА рд╡реЛрд▓реНрдЯреЗрдЬ рд╣реЛрддреА рд╣реИ
(b) When current through the capacitor is a 1/root2 time its value/ рдЬрдм рд╕рдВрдзрд╛рд░рд┐рддреНрд░ рдХреЗ рдорд╛рдзреНрдпрдо рд╕реЗ рдзрд╛рд░рд╛ рдЧреБрдЬрд░рддреА рд╣реИ рддреЛ рдЗрд╕рдХрд╛ рдорд╛рди 1/ рдореВрд▓2 рд╣реЛрддрд╛ рд╣реИ
(c) When the supply voltage is equal to the capacitor voltage/ рдЬрдм рдЖрдкреВрд░реНрддрд┐ рд╡реЛрд▓реНрдЯреЗрдЬ рд╕рдВрдзрд╛рд░рд┐рддреНрд░ рд╡реЛрд▓реНрдЯреЗрдЬ рдХреЗ рдмрд░рд╛рдмрд░ рд╣реЛрддрд╛ рд╣реИ
(d) Never/рдХрднреА рдирд╣реАрдВ

S3. Ans.(c)
Sol. When the capacitor voltage is equal to the supply voltage the current stops flowing through the circuit and the charging phase is over.

Q4. What happens to the current flow in a fully charged capacitor?
рдПрдХ рдкреВрд░реА рддрд░рд╣ рд╕реЗ рдЪрд╛рд░реНрдЬ рд╕рдВрдзрд╛рд░рд┐рддреНрд░ рдореЗрдВ, рдзрд╛рд░рд╛ рдкреНрд░рд╡рд╛рд╣ рдХрд╛ рдХреНрдпрд╛ рд╣реЛрддрд╛ рд╣реИ?
(a) Current flow stops/рдзрд╛рд░рд╛ рдкреНрд░рд╡рд╛рд╣ рд░реБрдХ рдЬрд╛рддрд╛ рд╣реИ
(b) Current flow doubles/рдзрд╛рд░рд╛ рдкреНрд░рд╡рд╛рд╣ рджреЛрдЧреБрдирд╛ рд╣реЛ рдЬрд╛рддрд╛ рд╣реИ
(c) Current flow becomes half its original value/ рдзрд╛рд░рд╛ рдкреНрд░рд╡рд╛рд╣ рдЕрдкрдиреЗ рд╡рд╛рд╕реНрддрд╡рд┐рдХ рдорд╛рди рдХрд╛ рдЖрдзрд╛ рд╣реЛ рдЬрд╛рддрд╛ рд╣реИ
(d) Current flow becomes one-fourth its original value/ рдзрд╛рд░рд╛ рдкреНрд░рд╡рд╛рд╣ рдЕрдкрдиреЗ рд╡рд╛рд╕реНрддрд╡рд┐рдХ рдорд╛рди рдХрд╛ рдПрдХ рдЪреМрдерд╛рдИ рд╣реЛ рдЬрд╛рддрд╛ рд╣реИ

S4. Ans.(a)
Sol. When a capacitor is fully charged, it does not store any more charge. There is no change in charge with time. Current is the rate of change of charge, hence it becomes zero, or stops.

Q5. For very low frequencies, capacitor acts as ________
рдмрд╣реБрдд рдХрдо рдЖрд╡реГрддреНрддрд┐рдпреЛрдВ рдХреЗ рд▓рд┐рдП, рд╕рдВрдзрд╛рд░рд┐рддреНрд░ ________ рдХреЗ рд░реВрдк рдореЗрдВ рдХрд╛рд░реНрдп рдХрд░рддрд╛ рд╣реИред
(a) Open circuit/ рдЦреБрд▓рд╛ рдкрд░рд┐рдкрде
(b) Short circuit/ рд▓рдШреБ рдкрд░рд┐рдкрде
(c) Amplifier/ рдПрдореНрдкрд▓реАрдлрд╛рдпрд░
(d) Rectifier/рд░реЗрдХреНрдЯрд┐рдлрд╛рдпрд░

S5. Ans.(a)
Sol. Capacitive impedance is inversely proportional to frequency. Hence at very low frequencies the impedance is almost infinity and hence acts as an open circuit and no current flows through it.

Q6. VDU stands for __________
рд╡реАрдбреАрдпреВ рдХрд╛ рдкреВрд░реНрдг рд░реВрдк рд╣реИ:
(a) Virtual Display Unit
(b) Visual Display Unit
(C) Virtual Detection Unit
(d) Visual Detection Unit

S6. Ans.(b)
Sol. A Visual Display unit is also referred to as the monitor who basically is used to give the results or outputs to the user. It comprises of a cathode ray tube internally.

Q7. The devices that used to give single or multiple colored images and drawings are ____________
рдПрдХрд▓ рдпрд╛ рдПрдХрд╛рдзрд┐рдХ рд░рдВрдЧреАрди рдЪрд┐рддреНрд░ рдФрд░ рдЖрд░реЗрдЦ рджреЗрдиреЗ рдХреЗ рд▓рд┐рдП рдЙрдкрдпреЛрдЧ рдХрд┐рдП рдЬрд╛рдиреЗ рд╡рд╛рд▓рд╛ рдЙрдкрдХрд░рдг ____________ рд╣реИрдВред
(a) Monitors/рдореЙрдиреАрдЯрд░реНрд╕
(b) Printers/рдкреНрд░рд┐рдВрдЯрд░реНрд╕
(c) Plotters/рдкреНрд▓реЛрдЯрд░реНрд╕
(d) VDUs/рд╡реАрдбреАрдпреВ
S7. Ans.(c)
Sol. Plotters are the devices which are used to give colored images. They use ink pens or ink jets for drawing. Pens of different colors and shades are used for shading and styling.

Q8.  Line Printers that print one line at a time are _________
рд▓рд╛рдЗрди рдкреНрд░рд┐рдВрдЯрд░ рдЬреЛ рдПрдХ рд╕рдордп рдореЗрдВ рдПрдХ рд▓рд╛рдЗрди рдкреНрд░рд┐рдВрдЯ рдХрд░рддреЗ рд╣реИрдВ, _________ рдХрд╣рд▓рд╛рддреЗ рд╣реИрдВред
(a) Laser Printers/ рд▓реЗреЫрд░ рдкреНрд░рд┐рдВрдЯрд░реНрд╕
(b) Inkjet Printers/ рдЗрдВрдХрдЬреЗрдЯ рдкреНрд░рд┐рдВрдЯрд░реНрд╕
(c) Drum Printers/ рдбреНрд░рдо рдкреНрд░рд┐рдВрдЯрд░реНрд╕
(d) Chain Printers/ рдЪреИрди рдкреНрд░рд┐рдВрдЯрд░реНрд╕
S8. Ans.(c)
Sol. The drum printers have a solid cylindrical drum with characters embossed on its surface in the form of circular bands. It can only print a predefined set of characters.

Q9. Match List-I with List-II and select the correct answer from the codes given below:
рд╕реВрдЪреА- I  рдХреЗ рд╕рд╛рде рд╕реВрдЪреА- II рдХрд╛ рдорд┐рд▓рд╛рди рдХрд░реЗрдВ рдФрд░ рдиреАрдЪреЗ рджрд┐рдП рдЧрдП рдХреЛрдб рдореЗрдВ рд╕реЗ рд╕рд╣реА рдЙрддреНрддрд░ рдЪреБрдиреЗрдВ:
рд╕реВрдЪреА- I        рд╕реВрдЪреА- II
A. Acceleration/рддреНрд╡рд░рдг 1. Joule/рдЬреВрд▓
B. Electric current/рд╡рд┐рджреНрдпреБрддреН рдкреНрд░рд╡рд╛рд╣ 2. Newton second/рдиреНрдпреВрдЯрди рд╕реЗрдХреЗрдВрдб
C. Work done/рдХрд┐рдпрд╛ рдЧрдпрд╛ рдХрд╛рд░реНрдп 3. Ampere/рдПрдореНрдкреАрдпрд░
D. Impulse/рд╕рдВрд╡реЗрдЧ 4. Meter per sec^2тБб./рдореАрдЯрд░ рдкреНрд░рддрд┐ рд╡рд░реНрдЧ рд╕реЗрдХреЗрдгреНрдб
Codes/рдХреЛрдб:
A B C D
(a) 1 2 3 4
(b) 2 3 4 1
(c) 4  3 1 2
(d) 3 4 1

S9. Ans.(c)
Sol. The unit of acceleration is meter per sec^2тБб. The unit of electric current is ampere. The unit of work done is joule. The unit of impulse is newton second. .

Q10. A real gas behaves as an ideal gas when?
рдПрдХ рд╡рд╛рд╕реНрддрд╡рд┐рдХ рдЧреИрд╕ рдПрдХ рдЖрджрд░реНрд╢ рдЧреИрд╕ рдХреЗ рд░реВрдк рдореЗрдВ рдХрдм рд╡реНрдпрд╡рд╣рд╛рд░ рдХрд░рддреА рд╣реИ?
(a) Temperature approaches zero/рддрд╛рдкрдорд╛рди рд╢реВрдиреНрдп рддрдХ рдкрд╣реБрдБрдЪ рдЬрд╛рддрд╛ рд╣реИ
(b) Pressure approaches zero/рджрд╛рдм рд╢реВрдиреНрдп рддрдХ рдкрд╣реБрдБрдЪ рдЬрд╛рддрд╛ рд╣реИ
(c) Both temperature and pressure approaches zero/рддрд╛рдкрдорд╛рди рдФрд░ рджрд╛рдм рджреЛрдиреЛрдВ рд╢реВрдиреНрдп рддрдХ рдкрд╣реБрдБрдЪ рдЬрд╛рддреЗ рд╣реИрдВ
(d) None of the mentioned/рджрд┐рдП рдЧрдП рдореЗрдВ рд╕реЗ рдХреЛрдИ рдирд╣реАрдВ

S10. Ans.(b)
Sol. It is a property of gas.

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