Description : The electric intensity at a distance of 1m from the point charge is 1μC is: (a) 9 × 109 N/C (b) 9 × 106 N/C (c) 9 × 103 N/C (d) 9 N/C
Last Answer : c) 9 × 103 N/C
Description : Explain why the water molecule has a bent shape and a bond angle less than 109.5° The electron repulsion between the two lone pairs of electrons on the oxygen of water causes the O–H bonds to squeeze close together
Last Answer : The electron repulsion between the two lone pairs of electrons on the oxygen of water causes the O–H bonds to squeeze close together
Description : When the medium is insulator the electrostatic force between the charges is: (a) Decreased (b) Zero (c) Increased (d) None of above
Last Answer : (a) Decreased
Description : A charge of 10μC and 14.4 μC are 12 cm apart, the force between them is: (a) 9 × 105 N (b) 9 × 107 N (c) 90 N (d) 108 × 107 N
Last Answer : (c) 90 N
Description : Force per meter on two wires carrying a current of 1 A placed 1 m apart is equal to A. 6.7 × 10-11 N B. 9.0 × 109 N C. 2.0 × 10-7 N D. 3.0 × 10-4 N
Last Answer : 2.0 × 10-7 N
Description : The practical application of electrostatic is: (a) Photocopier (b) X-rays machines (c) Laser (d) All of above 42. The electric field lines emerge from the charges in: (a) Three dimensions (b) Two dimensions (c) One dimension (d) All of above
Last Answer : (a) Photocopier
Description : The unit of relative permeability is (a) henry/metre (b) henry (c) henry/sq. m (d) it is dimensionless
Last Answer : (d) it is dimensionless
Description : N-type region has majority charge carriers as (a) Holes (b) protons (c) neutrons (d) electrons
Last Answer : (d) electrons
Description : Minority carriers in N-type are a) Holes b) Electrons c) Neutrons d) Protons
Last Answer : a) Holes
Description : The majority carriers in N-type substance are a) Holes b) Protons c) Neutrons d) Electrons
Last Answer : d) Electrons
Description : According to Bohr’s theory, the fourth stationary orbit of electrons in the hydrogen atom is a) 4 (0.053 nm) b) 9 (0.053 nm) c) 16 (0.053 nm) d) 25(0.053 nm)
Last Answer : c) 16 (0.053 nm)
Description : The electric force between two charges placed in air is 2 Newton. When placed in a medium of ∈r = 80, the force reduced to: (a) 0.029 N (b) 0.025 N (c) 0.03 N (d) 0.04 N
Last Answer : (b) 0.025 N
Description : A current of 5.8 A flows through a 0.25 m long straight conductor which is kept perpendicular in a region of uniform magnetic field of 3.7 T . The force on conductor is a) 5.4 N b) 2.4 N c) 3.4 N d) 6.4 N
Last Answer : a) 5.4 N
Description : An electron moves with a velocity of 2 × 106 ms-1 in the direction of a uniform magnetic field of 0.8 Tesla. The force on electron is a) 8 N b) 2 N c) 4 N d) Zero
Last Answer : d) Zero
Description : A charge of 2 coulomb is in a field of intensity 2 N/C. The force on charge is: (a) 4 π N (b) 4 N (c) 0 N (d) 1 N
Last Answer : b) 4 N
Description : Mass of Earth when it's radius is 6400 km and gravitational field strength is 9.81 N kg-1 is A. 6.0 × 1024 kg B. 5 × 1023 kg C. 40 × 109 kg D. 9 × 1024 kg
Last Answer : 5 × 1023 kg
Description : BMR of healthy adult women is about (A) 32 kcal/hour/square metre (B) 36 kcal/hour/square metre (C) 40 kcal/hour/square metre (D) 44 kcal/hour/square metre
Last Answer : Answer : B
Description : If the coefficient of friction on the road surface is 0.15 and a maximum super-elevation 1 in 15 is provided, the maximum speed of the vehicles on a curve of 100 metre radius, is (A) 32.44 km/hour (B) 42.44 kg/hour (C) 52.44 km/hour (D) 62.44 km/hour
Last Answer : Answer: Option C
Description : For the production of X-rays, the electrons which strike with the target are a) slow moving b) fast moving c) vibrational electrons d) free electrons
Last Answer : b) fast moving
Description : By the transition of inner shell electrons in heavy atoms, high energy photons are emitted which are a) gamma rays b) X-rays c) radio waves d) photon rays
Last Answer : b) X-rays
Description : The minimum frequency required to eject electrons from a metallic surface is called a) Critical frequency b) Peak value of frequency c) Threshold frequency d)Photo frequency
Last Answer : c) Threshold frequency
Description : The reverse current through semiconductor diode is due to (a) Minority carrier (b) majority carrier (c) electrons (d) holes
Last Answer : (a) Minority carrier
Description : Forward current through a semi-conductor diode circuit is due to ________ (a) Minority carriers (b) majority carriers (c) holes (d) electrons
Last Answer : (b) majority carriers
Description : The electrons in the outermost orbit of atom are: a) Valance electrons b) Static electrons c) Tightly bound d) Stationary
Last Answer : a) Valance electrons
Description : The number of electrons in one coulomb charge is equal to: (a) 6.2 × 1018 electrons (b) Zero electrons (c) 1.6 × 10−22 electrons (d) 6.2 × 1021 electrons
Last Answer : (a) 6.2 × 1018 electrons
Description : Free electrons are: (a) Fixed (b) Loosely bounded (c) Strongly fixed (d) Tightly bound
Last Answer : (b) Loosely bounded
Description : Metals are good conductors of electricity because they have: (a) Large number of bounded electrons (b) Small number of electrons (c) Large number of free electrons (d) Small number of free electrons
Last Answer : (c) Large number of free electrons
Description : Two infinitely long parallel conductors in vacuum any separated 1 metre between centers >then a current of 1 ampere flows the. uk each conductor, produce on each other a force of (a) 2 x 1(T2 N/m) (b) 2 x KT3 N/m (c) 2 x 10"5 N/m (d) 2x 1(T7 N/m)
Last Answer : (d) 2x 1(T7 N/m)
Description : A 2 kg block is dropped from a height of 4 metre onto a spring of force constant k = 1960 N/m. The spring will be compressed through a.1 cm b.4.5 cm c.3 cm d.8 cm e.107 dynes
Last Answer : d. 8 cm
Description : In precision theodolite traverse if included angles are read twice and the mean reading accepted using both verniers having a least count of 30". Assuming the instrument to be in perfect adjustment, linear measurements correct to 6 mm per ... legs) (A) 50" n (B) 30" n (C) 60" n (D) None of these
Last Answer : (A) 50" n
Description : Critical speed of rotation, N (in rps - rotation per second) of a trammel is equal to (where, g = acceleration due to gravity = 9.81 m/sec 2 and, r = radius of trammel, metre.) (A) (1/2π). √(g/r) (B) (1/π). √(g/r) (C) ½ √(g/r) (D) 2π. √(g/r)
Last Answer : (A) (1/2π). √(g/r)
Description : A shaft 9 m long is subjected to a torque 30 t-m at a point 3 m distant from either end. The reactive torque at the nearer end will be (A) 5 tonnes metre (B) 10 tonnes metre (C) 15 tonnes metre (D) 20 tonnes metre
Last Answer : (D) 20 tonnes metre
Description : (A) The nucleus of gold is stable even though there is a very strong coulombic repulsion among the protons. (R ) The inverse square coulomb force is e
Last Answer : (A) The nucleus of gold is stable even though there is a very strong coulombic repulsion among the protons. ... . If both (A) and (R ) are incorrect.
Description : The tail of a comet always points away from the sun due to (a) force of repulsion (b) centrifugal force (c) solar radiation and solar wind (d) an unknown reason
Last Answer : Ans:(c)
Description : The force between two long parallel conductors is inversely proportional to (a) radius of conductors (b) current in one conductor (c) product of current in two conductors (d) distance between the conductors
Last Answer : (d) distance between the conductors
Description : The two conductors of a transmission line carry equal current I in opposite directions. The force on each conductor is (a) proportional to 7 (b) proportional to X (c) proportional to distance between the conductors (d) inversely proportional to I
Last Answer : (b) proportional to X
Description : Current carried by each of the two long parallel conductors is doubled. If their separation is also doubled , force between them is
Last Answer : Increase two fold
Description : Two electron beams move parallel to each other. The nature of force between them is a) Attractive b) Repulsive c) Dependent on magnitude of velocity d) None
Last Answer : b) Repulsive
Description : In case of two identical charges placed at certain distance, the electric lines of force are: (a) Curved (b) Straight lines (c) Both (a) and (b) (d) None of these
Last Answer : a) Curved
Description : If the distance between the two charge bodies is halved, the force between them becomes: (a) Half (b) Four time (c) One fourth (d) Doubled
Last Answer : (c) One fourth
Description : In the reverse biased p-n junction, the current is of the order of (a) Ampere (b) Milliampere (c) Microampere (d) Nano-ampere
Last Answer : (d) Nano-ampere
Description : On increasing the reverse bias to a large value in a p-n junction diode current (a) Increases slowly (b) Remains fixed (c) Suddenly increases (d) Decreases slowly
Last Answer : (c) Suddenly increases
Description : In a semiconductor diode, p-side is earthed and to n-side is applied a potential of -2 volt; the diode shall (a) Conduct (b) Not conduct (c) Conduct partially (d) Break down
Last Answer : a) Conduct
Description : P-n junction when reversed biased acts as a (a) Capacitor (b) inductor (c) on switch (d) off switch
Last Answer : d) off switch
Description : In p-n-p transistor, collector current is (a) Equal to emitter current (b) slightly less than emitter current (c) greater than emitter current (d) any of above
Last Answer : (c) greater than emitter current
Description : In n-p-n transistor, p works as ________ (a) Collector (b) emitter (c) base (d) any of above
Last Answer : c) base
Description : Which is the most important building block of electronic devices? (a) Diode (b) p-n junction (c) transistor (d) rectifier
Last Answer : b) p-n junction
Description : A semiconductor formed by addition of trivalent impurity is : a) P–Type b) N–Type c) Q–type d) M–Type
Last Answer : d) M–Type
Description : Substances of conductivity between 10–10 10–20 (n m )–1 are: a) Insulators b) Semiconductors c)Super conductors d)Good conductors
Last Answer : a) Insulators
Description : S.I unit of strain is a) Newton b) N m–2 c) Pascal d) no unit
Last Answer : a) Newton