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This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following sand is freely available?(a) Silica sand(b) Zircon(c) Olivine(d) Dolomite |
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Answer» Right choice is (a) Silica sand To explain I would say: Silica sand has this as one of its advantages, that it is available without any difficulty in abundance. Hence, the cost of silica sand is also low. |
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| 2. |
At what distance should the gagger be kept from the pattern?(a) 3mm(b) 6mm(c) 9mm(d) 12mm |
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Answer» Correct option is (b) 6mm To explain I would say: The distance between a gagger and a pattern should be about 6mm so that it is within the reach of the pattern. |
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| 3. |
Which of the following is the most porous sand?(a) Silica sand(b) Zircon(c) Olivine(d) Dolomite |
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Answer» Right answer is (a) Silica sand For explanation I would say: Even when the silica sand are packed as mould cavity, they show enough porosity and permeability, and hence are porous sands. |
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| 4. |
On increasing the chloride deposit the Ag-AgCl electrode ______________(a) increases the impedance(b) reduces impedance(c) has no effect on impedance(d) cannot be determined |
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Answer» Correct answer is (a) increases the impedance Easiest explanation: Studies have shown that the impedance of the electrode was different layers of chloride. There is an optimum chloriding, which gives the lowest impedance. Above and below that value the impedance is high. |
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| 5. |
What is the breadth size range of a clay particle?(a) 0.01-1 micrometres(b) 0.02-2 micrometres(c) 0.03-3 micrometres(d) 0.04-4 micrometres |
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Answer» Correct answer is (a) 0.01-1 micrometres For explanation I would say: The particles of clay are very small and need high precision microscopes to determine its size. Clay particles in their breadth have a particle size range in between 0.01 micrometres to 1 micrometres. |
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| 6. |
Splash core is used _____(a) to reduce the eroding force of the liquid metal(b) to make the flow smooth and slow(c) to remove dross from the molten metal(d) to prevent heavier impurities from entering the mould |
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Answer» Right option is (a) to reduce the eroding force of the liquid metal Explanation: A ceramic splash core is placed at the end of the sprue reduces the eroding force of the liquid metal stream. It acts the same as pouring basin that also reduces the eroding force of the liquid metal coming directly from the furnace as well as maintains a constant pouring head. |
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| 7. |
Capacitance increases with __________(a) Increase in distance between the plates(b) Decrease in plate area(c) Decrease in distance between the plates(d) Increase in density of the material |
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Answer» Right option is (c) Decrease in distance between the plates Best explanation: Capacitance is inversely proportional to the distance between the two parallel plates. Hence, as the distance between the plate decreases, the capacitance increases. |
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| 8. |
When capacitors are connected in parallel, what happens to the effective plate area?(a) Increases(b) Decreases(c) Remains the same(d) Becomes zero |
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Answer» The correct answer is (a) Increases To explain I would say: When capacitors are connected in parallel, the top plates of each of the capacitors are connected together while the bottom plates are connected to each other. This effectively increases the top plate area and the bottom plate area. |
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| 9. |
Which of the following items is used for trapping impurities from entering the mould?(a) Facing sand(b) Core(c) Skim bob(d) Pouring basin |
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Answer» The correct option is (c) Skim bob For explanation: Skim bob is a trap placed in a horizontal gate to prevent heavier and lighter impurities from entering the mould. It removes the dross if not strained by strainer and the sand also. Skim bob appears like as shown in the below figure. |
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| 10. |
What prevents the liquid metal from entering the gate?(a) Gate basin(b) Sprue(c) Runner(d) Riser |
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Answer» Right option is (a) Gate basin For explanation I would say: A gate basin plays a very vital role in stopping the liquid metal flow. A gate basin does not allow the turbulently flowing liquid metal to enter the gate. |
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| 11. |
The voltage across the open circuit is?(a) 100V(b) Infinity(c) 90V(d) 0V |
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Answer» Correct choice is (a) 100V For explanation: The voltage across all branches in a parallel circuit is the same as that of the source voltage. Hence the voltage across the 10 ohm resistor and the open circuit is the same=100V. |
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| 12. |
The total resistance between A and B are?(a) 20 ohm(b) 5 ohm(c) 80 ohm(d) 0 ohm |
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Answer» The correct option is (b) 5 ohm To explain: The resistors are connected in parallel, hence the equivalent resistance = 1/(1/20+1/20+1/20+1/20)=5A. |
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| 13. |
What happens to the current in a coil while accelerating a magnet inside it?(a) Increases(b) Decreases(c) Remains constant(d) Reverses |
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Answer» Correct answer is (a) Increases For explanation I would say: A change in the magnetic field induces an emf. When there is an emf, there has to be current. Hence, when the magnet is moved inside a coil, the current in it increases. |
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| 14. |
Find the length of a conductor which is moving with a velocity 0.4m/s in a magnetic field of 8T, inducing an emf of 20V if magnetic field, velocity and length of conductor are mutually perpendicular to each other.(a) 50m(b) 5m(c) 6.25m(d) 0.5m |
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Answer» The correct answer is (c) 6.25m The best I can explain: The formula for induced emf is: emf=Blv if B, l, v are perpendicular to each other. Substituting the values of B, emf and v from the question, we get l=6.25m. |
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| 15. |
Timbers with ___________ annular rings are generally the strongest.(a) Narrow(b) Wide(c) Distinct(d) Indistinct |
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Answer» Correct choice is (a) Narrow Easiest explanation: Annular rings are formed every year and they consist of innumerable cells of fibres and tissues. Total number of annular rings indicate an age of tree. Narrow annular rings indicate the strength of tree. |
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| 16. |
What is the unit for relative permeability?(a) H-m(b) H/m(c) H^2/m(d) No unit |
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Answer» Right answer is (d) No unit For explanation: Relative permeability is the ratio of permeability of the material to the permeability of free space. Since it is a ratio, it does not have any units. |
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| 17. |
Which of the following is not present in a circle?(a) Angle(b) Centre(c) Sector(d) Eccentricity |
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Answer» The correct choice is (d) Eccentricity Explanation: Eccentricity can be defined as a parameter associated with every conic section. It can be thought of as a measure of how much the conic section deviates from being circular. Options like angle, centre and sector are there in a circle except the eccentricity. |
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| 18. |
The unit for force in a current carrying conductor is _________(a) Tesla*Ampere*metre(b) Tesla(c) Ampere/metre(d) Ampere*metre |
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Answer» The correct option is (a) Tesla*Ampere*metre The best explanation: F=B*i*l. So,unit of force=unit of B * unit of i * unit of l = Tesla*Ampere*metre. |
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| 19. |
Which method is not adopted for volume calculating?(a) From cross-section(b) From spot level(c) From contour(d) From plan |
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Answer» Right choice is (d) From plan To explain: Volume can be measured by a contour map, but the volume calculated by this method is approximate. It cannot be compared with the volume calculated by the cross-section method. As the full ground irregularities are not predicted by contours, and also as the contour intervals are not small, volume calculated from contours is likely to be an approximate one. To calculate volume by this method, general recommendations of contour interval is a maximum of 2 meters for a regular ground surface, and 0.5 meter for an irregular topography. |
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| 20. |
In generators, the rate of change of flux linkage is maximum when the coil is moving through the A. vertical position B. horizontal position C. diagonal position D. at an angle of 45° |
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Answer» B. horizontal position |
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| 21. |
Which is the most cost efficient connection?(a) Series(b) Parallel(c) Either series or parallel(d) Neither series nor parallel |
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Answer» The correct choice is (a) Series To elaborate: The advantage of series-connections is that they share the supply voltage, hence cheap low voltage appliances may be used. |
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| 22. |
For a straight wire, induced current depends upon A. the speed of movement of wire B. the length of wire C. the magnitude of magnetic flux density D. all of above |
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Answer» D. all of above |
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| 23. |
Does the 15A source have any effect on the circuit?(a) Yes(b) No(c) Cannot be determined(d) Yes, only when the 10V source is removed |
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Answer» Correct answer is (b) No Easy explanation: The 15A current source has a lower resistance path associated with it and hence it keeps moving in that particular loop. It does not leave that loop and enter the circuit, hence the circuit is not affected by it. |
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| 24. |
If net force is zero on a particle in magnetic field what is relation between velocity and magnetic field?(a) v=E*B(b) v=E/B(c) v=B/E(d) v=1/(E*B) |
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Answer» Right choice is (b) v=E/B Explanation: Since net force is zero on the particle. Electric force = Magnetic force QE = QvB => E=vB or v=E/B. |
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| 25. |
What is the value of current if a 50C charge flows in a conductor over a period of 5 seconds?(a) 5A(b) 10A(c) 15A(d) 20A |
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Answer» The correct option is (b) 10A To explain: Current=Charge/Time. Here charge = 50c and time = 5seconds, so current = 50/5 = 10A. |
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| 26. |
In transformer, the core is made up of soft iron in order to pass the maximum A. flux B. current C. magnetic flux D. voltage |
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Answer» C. magnetic flux |
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| 27. |
Find the value of V, if the value of I3= 0A.(a) 1.739 V(b) 6.5 V(c) 4.5V(d) 2.739V |
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Answer» The correct option is (a) 1.739 V For explanation: 5-3I1+2I2=0, 9I2-2I1=0, -4I2+V=0 On solving,V=1.739V. |
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| 28. |
Find the voltage due to the 15A source.(a) 0V(b) 2V(c) 4V(d) 6V |
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Answer» The correct option is (a) 0V The best I can explain: Due to 15 A current source, 10V and 16V sources get shorted and the 3A source acts as an open circuit. Since the 10V source is shorted, it acts as a low resistance path and current flows only within that loop and do not flow to the 20 ohm resistor. Hence the voltage is 0V. |
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| 29. |
Chromosome maps/genetic maps were first prepared byA. Sutton and Boveri (1902)B. Bateson and punnett (1906)C. Morgan (1910)D. Sturtevant (1911) |
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Answer» Correct Answer - D Linkage or genetic or chromosome map is a linear graphical representation of the sequence and relative distances of the various genes present in a chromosome. The first chromosome maps were prepared by Sturtevant in 1911 for two chromosomes and in 1913 for all the four chromosomes of Drosophila. |
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| 30. |
What is the basic law that has to be followed in order to analyze the circuit?(a) Newton’s laws(b) Faraday’s laws(c) Ampere’s laws(d) Kirchhoff’s law |
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Answer» Right answer is (d) Kirchhoff’s law To explain I would say: Kirchhoff’s laws, namely Kirchhoff’s Current Law and Kirchhoff’s Voltage law are the basic laws in order to analyze a circuit. |
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| 31. |
A straight wire of length 0.20 m moves at a steady speed of 3.0 m s-1 at right angles to the magnetic field of flux density 0.10 T. The e.m.f induced across ends of wire is A. 0.5 V B. 0.06 V C. 0.05 V D. 0.04 V |
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Answer» The Correct option is B. 0.06 V |
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| 32. |
Magnitude of induced e.m.f is proportional to A. rate of change of current B. rate of change of voltage C. rate of change of magnetic flux linkage D. rate of change of resistance |
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Answer» C. rate of change of magnetic flux linkage |
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| 33. |
In superposition theorem, when we consider the effect of one voltage source, all the other voltage sources are ____________(a) Shorted(b) Opened(c) Removed(d) Undisturbed |
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Answer» Right answer is (a) Shorted The explanation: In superposition theorem when we consider the effect of one voltage source, all the other voltage sources are shorted and current sources are opened. |
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| 34. |
The distance between the genes is measuredbyA. angstromB. map unitC. Dobson unitD. millimetre |
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Answer» Correct Answer - B The distance between genes is measured by map unit 1 %. Crossing over between two linked genes is known as 1 map unit or centi Morgan (cM). 100 % crossing over is termed as Morgan (M) and 10 % crossing over as deci Morgan (dm). |
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| 35. |
What is the value of impedance at resonance?(a) XL(b) XC(c) R(d) 0 |
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Answer» The correct option is (c) R Easy explanation: At resonance, XL=XC Z^2=R^2+(XL-XC)^2 Z=R So Z is minimum at resonance. |
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| 36. |
Calculate Vth for the given circuit.(a) 5.54V(b) 3.33V(c) 6.67V(d) 3.67V |
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Answer» Right choice is (c) 6.67V The explanation is: 4 ohm is removed and then v across 2 ohm is calculated by voltage divider 2*10/(2+1) = 6.67V. Voltage between A and B i.e. Vth is equal to voltage across 4 ohm resistance since no current flow through 3 ohm resistance. So, Vth = 6.67V. |
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| 37. |
By accelerating the magnet inside the coil, the current in itA. increasesB. decreasesC. remains constantD. reverses |
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Answer» A. increases |
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| 38. |
Consequence of motor effect is A. electromagnetic induction B. current C. voltage D. e.m.f |
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Answer» A. electromagnetic induction |
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| 39. |
Total number of magnetic field lines passing through an area is called A. magnetic flux density B. magnetic flux C. e.m.f D. voltage |
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Answer» B. magnetic flux |
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| 40. |
When using a fluxmeter, if the flux changes from Φ to -Φ, what happens to the current?(a) Becomes zero(b) Becomes infinity(c) Remains the same(d) Reverses |
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Answer» Correct choice is (d) Reverses For explanation: When the flux changes from Φ to -Φ, the current direction will change as the direction of flux is changing. |
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| 41. |
Which of the following is suitable for experiment on linkage ?A. aaBB `xx` aaBBB. AABB `xx` aabbC. AaBb `xx` AaBbD. AAbb `xx` AaBB |
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Answer» Correct Answer - B Linked and unlinked genes can be easily known form breeding experiments. Unlinled genes show independent assorment in a dihybrid ratio of `9:3:3:1` and the dihybrid or double test cross ratio od `1:1:1:1` with two parental and two recombinant types. The linked genes do not show independent asssortment but remain together and are inherited en block producing only parental type of progeny. They give a digybrid ratio of `3:1` and a test cross ratio of `1:1` Linkage can be shown by a cross between homozygous dominant AABB and homozygous recessive aabb. |
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| 42. |
What is φ in terms of voltage?(a) φ=cos^-1V/VR(b) φ=cos^-1V*VR(c) φ=cos^-1VR/V(d) φ=tan^-1V/VR |
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Answer» Right choice is (c) φ=cos^-1VR/V Easiest explanation: From the voltage triangle, we get cosφ= VR/V. Hence φ=cos^-1VR/V. |
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| 43. |
In Thevenin’s theorem Vth is __________(a) Sum of two voltage sources(b) A single voltage source(c) Infinite voltage sources(d) 0 |
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Answer» Correct option is (b) A single voltage source Explanation: Thevenin’s theorem states that a combination of voltage sources, current sources and resistors is equivalent to a single voltage source V and a single series resistor R. |
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| 44. |
Nodal analysis can be applied for________(a) Planar networks(b) Non-planar networks(c) Both planar and non-planar networks(d) Neither planar nor non-planar networks |
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Answer» Correct option is (c) Both planar and non-planar networks The best I can explain: Nodal analysis can be applied for both planar and non-planar networks since each node, whether it is planar or non-planar, can be assigned a voltage. |
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| 45. |
An induced emf is said to be ________(a) Inductive(b) Capacitive(c) Resistive(d) Cannot be determined |
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Answer» Right answer is (a) Inductive To elaborate: Any circuit in which a change of current is accompanied by a change of flux, and therefore by an induced emf, is said to be inductive. |
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| 46. |
Mendel law of independent assortment does not hold true for the genes that are located closely onA. same chromosomeB. non-homologous chromosomesC. X-chromosomeD. autosomes |
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Answer» Correct Answer - A As per linkage experiments carried out by Morgan, the two linked genes do not always segregate independently of each other and `F_(2)` ratio deviated very significantly from `9:3:3:` ratio (expected when two genes are independent). Hence, if linkage was known at the time of Mendel, he would not have been able to explain law ofd independent assorment. |
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| 47. |
In the following figure, Part 3 represents?(a) rigid wall(b) water storage tank(c) garbage tank(d) water treatment tank |
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Answer» Right option is (b) water storage tank Explanation: A water tank is a container for storing water. Water tanks are used to provide storage of water for use in many applications, drinking water, irrigation agriculture, fire suppression, agricultural farming, both for plants and livestock, chemical manufacturing, food preparation as well as many other uses. Water tank parameters include the general design of the tank, and choice of construction materials, linings. Various materials are used for making a water tank: plastics (polyethylene, polypropylene), fiberglass, concrete, stone, steel (welded or bolted, carbon, or stainless). |
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| 48. |
B/H curve shows the relationship between?(a) Magnetic field strength and magnetic flux(b) Magnetic field strength and magnetic flux density(c) Current and magnetic flux density(d) Voltage and magnetic flux density |
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Answer» Right answer is (b) Magnetic field strength and magnetic flux density To explain: The B/H curve shows the relation between magnetic field strength and magnetic flux density. |
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| 49. |
If a 2F capacitor has 1C charge, calculate the voltage across its terminals.(a) 0.5V(b) 2V(c) 1.5V(d) 1V |
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Answer» The correct answer is (a) 0.5V Explanation: Q is directly proportional to V. The constant of proportionality in this case is C, that is, the capacitance. Hence Q=CV. V=Q/C=1/2 V=0.5V. |
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| 50. |
Magnetomotive force is equal to__________________(a) current * number of turns(b) current / number of turns(c) current / number of turns per unit length(d) current * number of turns per unit length |
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Answer» Right choice is (a) current * number of turns For explanation: MMF is ability to produce flux and is equal to product of current flowing and number of turns. |
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