Description : Assertion : Two resistance wires shown in figure are of same material. They have equal length. More heat is generated in wire A. Reason : In series `H
Last Answer : Assertion : Two resistance wires shown in figure are of same material. They have equal length. More ... . If Assertion is false but Reason is true.
Description : Two wires A and B of the same material have their lengths in the ratio `1 : 5` and diameters in the ratio ` 3 : 2`. If the resistance of the wire B is
Last Answer : Two wires A and B of the same material have their lengths in the ratio `1 : 5` and diameters in ... `180 Omega`, find the resistance of the wire A.
Description : Four wires of the same material and dimensions as under are stretched by a load of same magnitude separately. Which of them will be elongated maximum? (a) wire of 3m length and 1.5 mm diameter (b) ... and 2mm diameter (c) wire of 2m length and 2mm diameter (d) wire of 1m length and 1mm diameter
Last Answer : Ans:(a)
Description : Two copper wires A and B of equal masses are taken. The length of A is double the length of B. If the resistance of wire A is `160 Omega `, then calcu
Last Answer : Two copper wires A and B of equal masses are taken. The length of A is double the length of ... Omega `, then calculate the resistance of the wire B.
Description : Two resistance wires on joining in parallel the resultant resistance is ohms `(6)/(5)` ohms. One of the wire breaks, the effective resistance is 2 ohm
Last Answer : Two resistance wires on joining in parallel the resultant resistance is ohms `(6)/(5)` ohms. One of the wire ... ` C. `(6)/(5)Omega` D. `3Omega`
Description : `1kg` piece of copper is drawn into a wire `1mm` thick and another piece into a wire `2mm` thick. Compare the resistance of these wires.
Last Answer : `1kg` piece of copper is drawn into a wire `1mm` thick and another piece into a wire `2mm` thick. Compare the resistance of these wires.
Description : On meter length of wires carriers a constant current. The wire is bent to from a circular loop. The magnetic field at the centre of this loop is `B`.
Last Answer : On meter length of wires carriers a constant current. The wire is bent to from a circular loop. The magnetic field at ... B. `4B` C. `B/4` D. `16B`
Description : Three long, straight and parallel wires are arranged as shown in Fig. The forces experienced by 10 cm length of wire Q is
Last Answer : Three long, straight and parallel wires are arranged as shown in Fig. The forces experienced by 10 cm length ... D. `2.6xx10^(-4)`N towards the left
Description : A 1m long wire of diameter `0.31mm` has a resistance of `4.2 Omega`. If it is replaced by another wire of same material of length `1.5m` and diameter
Last Answer : A 1m long wire of diameter `0.31mm` has a resistance of `4.2 Omega`. If it is replaced by another wire of ... 6 Omega` C. `26.7 Omega` D. `0.8 Omega`
Description : Two wires of the same radius & material having length in the ratio of 1 : 2 are stretched by the same force. The strain produced in the two wires will be in the ratio of (A) 1 : 1 (B) 1 : 2 (C) 2 : 1 (D) 1 : 4
Last Answer : Option A
Description : The plywood (A) Has good strength along the panel only (B) Can be spilt in the plane of the panel (C) Has greater impact resistance to blows than ordinary wood (D) Cannot be bent more easily than ordinary wood of same thickness
Last Answer : Answer: Option C
Description : For the same dimensions of the shaft which of the following has the greater natural frequency? A. Transverse B. Longitudinal C. Depends on thickness D. Depends upon length
Last Answer : B. Longitudinal
Description : For the same dimensions of the shaft which of the following has the greater natural frequency? (A) Transverse (B) Longitudinal (C) Depends on thickness (D) Depends upon length
Last Answer : (B) Longitudinal
Description : For the same dimensions of the shaft which of the following has the greater natural frequency? a) Transverse b) Longitudinal c) Depends on thickness d) Depends upon length
Last Answer : b) Longitudinal
Description : What affect does the thickness of a wire have on its resistance?
Last Answer : Ans: The resistance of a wire decreases as its thickness increases.
Description : Two wires of the same material but of different diameters carry the same current `i`. If the ratio of their diameters is `2:1` , then the correspondin
Last Answer : Two wires of the same material but of different diameters carry the same current `i`. If the ratio of their diameters is ... `1:1` C. `1:2` D. `1:4`
Description : Indicate the false statement about the resistance of a wire – (1) it depends on material of wire (2) it is directly proportional to the length of wire (3) it is directly proportional to the area of crosssection of wire (4) resistance of metallic wire increases with increase in temperature
Last Answer : (3) it is directly proportional to the area of cross-section of wire Explanation: The property of conductor due to which it opposes the flow of current through it is called Resistance. It is ... potential difference across its ends to the current flowing through it The SI unit of resistance is ohm.
Description : Specific resistance of a wire a. will depend on its length b. will depend on its radius c. will depend on the type of material of the wire d. will depend on none of the above
Last Answer : c. will depend on the type of material of the wire
Description : Indicate the false statement about the resistance of a wire (1) it depends on material of wire (2) it is directly proportional to the length of wire (3) it is directly proportional to the area of cross-section of wire (4) resistance of metallic wire increases with increase in temperature
Last Answer : it is directly proportional to the area of cross-section of wire
Description : What happens to the speed of a motor if I increase or Decrease the thickness of the wires in the circuit?
Last Answer : What is the answer ?
Description : Two uniform wires `A` and `B` are of the same total metal and have equal masses. The radius of wire `A` is twice that of wire `B`. The total resistanc
Last Answer : Two uniform wires `A` and `B` are of the same total metal and have equal masses. The radius of ... `5Omega` when the resistance of wire B is `4Omega`
Description : A composite wire is prepared by joining a tungsten wire and steel wire end to end. Both the wires are of the same
Last Answer : A composite wire is prepared by joining a tungsten wire and steel wire end to end. Both the wires are of ... 1011 Pa, YTungsten = 4.11 1011 Pa]
Description : In prestressing work, if more than one wire or strand is included in the same duct, why should all wires/strands be stressed at the same time?
Last Answer : If wires/strands are stressed individually inside the same duct, then those stressed strand/wires will bear against those unstressed ones and trap them. Therefore, the friction of the trapped wires is high and is undesirable.
Description : Two wire of the same meta have same length, but their cross-sections are in the rati `3:1` . They are joined in series. The resistance of thicker wire
Last Answer : Two wire of the same meta have same length, but their cross-sections are in the rati `3:1` . They are ... )Omega` C. `(5)/(2)Omega` D. `100Omega`
Description : A 10 cm dia steam pipe, carrying steam at 180°C, is covered with an insulation (conductivity = 0.6 W/m.°C). It losses heat to the surroundings at 30°C. Assume a heat transfer co-efficient of 0 ... that of the un-insulated steam pipe (D) Less than the steam pipe with 5 cms insulation
Last Answer : (B) Less than that of the un-insulated steam pipe
Description : Acrylic sheets (A) Possess 10 to 17 times greater breakage resistance than that of glass of equivalent thickness (B) Are generally unaffected by most household detergents (C) Possess the light transmission rate of 93% (D) All the above
Last Answer : Answer: Option D
Description : If all the lines in the image below are of the same length but of different thickness and are drawn in perspective with respect to their distance from the viewer, which of the following statements will be TRUE ... and line 3 have same thickness D. Line 3 is the closest line of all to the viewer
Last Answer : A D
Description : The length of a wire is increased by 1 mm on the application of a certain load. In a wire of the same material but of twice the length and half the radius, the same force will produce an elongation of (a) 0.5 mm (b) 2 mm (c) 4 mm (d) 8 mm
Last Answer : (d) 8 mm
Description : A wire of uniform area of cross-section A length L and resistance R is cut into two parts. Resistivity of each part a. remains the same b. is doubled c. is halved d. becomes zero
Last Answer : a. remains the same
Description : A wire is being used as a replacement having twice the length and one-half the cross-sectional area of the original wire. The resistance of this new wire, when compared to that of the original wire, ... B. twice as much C. the same as the original resistance D. one-half of the original resistance
Last Answer : Answer: A
Description : When the length and cross sectional area of a wire are both tripled, the resistance _____________. A. increases nine fold B. increases three fold C. remains the same D. decreases six fold
Last Answer : Answer: C
Description : A replacement wire having twice the length and one-half the cross-sectional area of the original wire will have a resistance that is _____________. A. four times that of the original wire B. twice that of ... wire C. the same as that of the original wire D. one-half that of the original wire
Description : Two identical conducting wires `AOB and COD` are placed at right angles to each other. The wire `AOB` carries an electric current `I_(1) and COD` carr
Last Answer : Two identical conducting wires `AOB and COD` are placed at right angles to each other. The wire `AOB` carries an electric ... )^(2)+I_(2)^(2))^(1//2)`
Description : Currents of `10A, 2A` are passed through two parallel wires `A` and `B` respectively in opposite directions. If the wire `A` is infinitely long and th
Last Answer : Currents of `10A, 2A` are passed through two parallel wires `A` and `B` respectively in opposite directions. If the ... `4xx10^(-7)N` D. `8xx10^(-7)N`
Description : Two infinitely long, thin, insulated, straight wires lie in the x-y plane along the x- and y- axis respectively. Each wire carries a current I, respec
Last Answer : Two infinitely long, thin, insulated, straight wires lie in the x-y plane along the x- and y- axis respectively. Each ... x C. y = x-1 D. y = -x+1
Description : Which of the following statements is correct concerning the circuits in a sound powered telephone system? A. The ringing circuit is composed of only one common wire to ground. B. The common ... connected to each station. D. The talking and calling circuits are electrically dependent upon each other.
Last Answer : Answer: B
Description : The local loop of the telephone system is understood to be A. a single piece of wire connecting the subscriber's telephone set to another telephone set in an adjacent room B. a two-wire or four- ... a facsimile machine to a computer D. a group of wires connecting a telephone set to a modem
Last Answer : B. a two-wire or four-wire communication circuit between the customer’s premise and central office
Description : Figure shows, three long straight wires parallel and equally speed with identical currents. Then, the force acting on each wire due to the other is
Last Answer : Figure shows, three long straight wires parallel and equally speed with identical currents. Then, the force acting on ... `F_(b) gt F_(a) gt F_(c)`
Description : i heard that flat speaker wires can carry more watts to the speakers, where online can i find some of this speaker wire?
Last Answer : They have audio outlets online through simple searching including Radioshack in which they offer very good prices.
Description : Nichrome wire is used as a heating element I many appliances because (a) it can be drawn out into wires easily (b) it has high resistivity (c) it resists oxidation in air when red hot (d) both (b) and (c) are correct
Last Answer : Ans:(d)
Description : Copper wires are generally used for electrical power transmission instead of iron wire because (1) copper is cheaper than iron (2) copper is lighter than iron (3) copper is a better conductor of electricity than iron (4) copper can take higher power than iron
Last Answer : (3) copper is a better conductor of electricity than iron Explanation: Copper is generally preferred for electrical power transmission instead of iron because of its high electrical conductivity and low resistivity.
Description : __________ is an interface for connecting eight or more data wires. A. Serial Port B. Fire wire C. Parallel Port D. None of the Above
Last Answer : C. Parallel Port
Description : The greatest induced EMF will occur in a straight wire moving at constant speed through a uniform magnetic field when the angle between the direction of the wire's motion and the direction of the magnetic field is w) 0 degrees x) 30 degrees y) 60 degrees z) 90 degrees
Last Answer : ANSWER: Z -- 90 DEGREES
Description : Copper wires are generally used for electrical power transmission instead of iron wire because : (1) copper is cheaper than iron (2) copper is lighter than iron (3) copper is a better conductor of electricity than iron (4) copper can take higher power than iron
Last Answer : copper is a better conductor of electricity than iron
Description : Resistance to heat flow by conduction is proportional to (where, t & ρ are thickness & density of the material respectively and A = area normal tothe direction of heat flow.) (A) t (B) 1/ρ (C) 1/A (D) All (A), (B) & (C)
Last Answer : (D) All (A), (B) & (C)
Description : Sizing material is incorporated in paper to (A) Impart resistance to penetration by liquids (B) Increase its thickness (C) Increase its flexibility & opacity (D) Increase its brightness
Last Answer : (A) Impart resistance to penetration by liquids
Description : reduction in thermal resistance during heat transfer does not occur in the (A) Convection heat transfer by stirring the fluid and cleaning the heating surface (B) Conduction heat transfer by ... Radiation heat transfer by increasing the temperature and reducing the emissivity (D) None of these
Last Answer : Option C
Description : Which of the following is the formula for thermal resistance? A. Thickness of material/ thermal conductivity of material B. 2(thickness of material)/thermal conductivity of material C. ... / 2(thermal conductivity of material) D. Thickness of material x thermal conductivity of material
Last Answer : Thickness of material/ thermal conductivity of material
Description : A wall has two layers of materials A and B; each made of a different material. Both the layers have the same thickness. The thermal conductivity of material A is twice that of B. Under the equilibrium, the temperature ... difference across the layer A is __________ °C. (A) 6 (B) 12 (C) 18 (D) 24
Last Answer : (B) 12
Description : When two concentric springs are made of same material, having same free length and compressed equally by axial load, then the load shared by each spring is proportional to (A) Spring index of each spring ... spring (C) Mean coil diameter of each spring (D) Square of wire diameter of each spring
Last Answer : (D) Square of wire diameter of each spring