Description : The value of Rydberg’s constant is a) 1.0974 x 10-7 m-1 b) 1.0974 x 107 m-1 c) 1.0974 x 107 m-2 d) 1.0974 x 10-7 m-2
Last Answer : b) 1.0974 x 107 m-1
Description : The product of uncertainties of two physical observables must be approximately equal to a)Coulomb’s constant K b) Rydberg’s constant R c)Planck’s constant d)All of the above
Last Answer : c)Planck’s constant
Description : If electron has to be confined in the nucleus, its speed would have to be greater than a) 1010 cm/s b) 1010 m/s c) 1020 m/s d) 1020 cm/s
Last Answer : b) 1010 m/s
Description : S.I unit of strain is a) Newton b) N m–2 c) Pascal d) no unit
Last Answer : a) Newton
Description : S.I unit of stress is: a) N/m b) N m c) Nm–2 d) Newton
Last Answer : c) Nm–2
Description : The radius of hydrogen atom is about a) 5 x 10-11 m b) 5 x 10-11 cm c) 5 x 10-11 mm d) 5 x 10-11 dm
Last Answer : a) 5 x 10-11 m
Description : The SI unit of Planck’s constant is a) Joule – Sec-1 b) Joule – Sec-2 c) Joule – Sec d) Joule – Sec2
Last Answer : c) Joule – Sec
Description : An α particle moves perpendicular to a constant magnetic field of strength 1.2 T in a circular path of radius 0.7 m. The speed of α particle in ms-1 is ______________ a) 2.7 × 107 b) 2.6 × 107 c) 3.2 × 107 d) 2.0 × 107
Last Answer : a) 2.7 × 107
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 : SI unit of resistivity is a. ohm b. Ohm×m c. Ohm×m-1 d. Ohm×m2
Last Answer : c. Ohm×m-1
Description : The S.I Unit of Modulus elasticity is: a) Pascal b) Coulomb c) Ampere d) None
Last Answer : a) Pascal
Description : Please ripley me due to emergency
Last Answer : To calculate the flux density in the ring, you need to use the following formula: B = (μ * I * N) / (2 * π * r) where: B is the flux density in the ring (in teslas) μ is the relative permeability ... 2 * π * 0.127 m) = 0.53 T So the flux density in the ring would be approximately 0.53 teslas.
Description : Red Laser light has a wavelength of a) 630.8 nm b) 630 cm c) 632.8 nm d) 639.9 nm
Last Answer : c) 632.8 nm
Description : The value of first quantized Bohr orbit radius of hydrogen atom is a) 0.0053 nm b) 5.3 nm c) 0.053 nm d) 0.053 cm
Last Answer : c) 0.053 nm
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 : The claddingwhichsurroundsthe fiber core a. is used to reduce optical interference b. is used to protect the fiber c. acts to help guide the light in the core d. ensures that the refractive index remains constant
Last Answer : c. acts to help guide the light in the core
Description : Electromagneticwaves are refractedwhen they a. pass into a medium of different dielectric constant b. are polarized at right angles to the direction of propagation c. encounter a perfectly conducting plane d. pass through a small slot in a conducting plane
Last Answer : a. pass into a medium of different dielectric constant
Description : Thevelocityfactor of a transmissionline a. depends on the dielectric constant of the material used b. increases the velocity along the transmission line c. is govern by the skin effect d. is higher for a solid dielectric than for air
Last Answer : a. depends on the dielectric constant of the material used
Description : Even though the main engine runs at varying speeds, how does the alternator maintain constant frequency?
Last Answer : By use of thyristor controlled frequency (rpm) converters.
Description : Dimension of Rydberg constant is a) LT-1 b) L-1 c) (LT)-1 d) L-1T
Last Answer : b) L-1
Description : With increase in the velocity of an object its mass will a) Increase b) Decrease c) Remain constant d) None of the above
Last Answer : a) Increase
Description : Conductivity of semi conductor is increased by: a) Decrease of temperature b) By keeping temperature constant c) Increase of temperature d) none of above
Last Answer : d) none of above
Description : If the motor is overloaded, then the magnitude of ‘back emf’” a. Increases b. Decreases c. Constant d. Becomes zero
Last Answer : Increases
Description : The induced emf is produced in a circuit due to: a. Initial magnetic flux b. final magnetic flux c. Change of magnetic flux d. constant magnetic flux
Last Answer : d. constant magnetic flux
Description : When the field is strong, the lines of force are: (a) Closer (b) Parallel (c) Farther (d) All of above 45. The electric lines of force determine the strength of an: (a) Gravitational field (b) Constant field (c) Magnetic field (d) Electric field
Last Answer : d) Electric field
Description : Tesla is a unit of (a) field strength (b) inductance (c) flux density (d) flux
Last Answer : (c) flux density
Description : The unit of electric intensity is
Last Answer : Volt/ metre
Description : The unit of absolute permittivity of a medium is
Last Answer : Farad/ metre
Description : What is the unit for capacitance ?
Last Answer : Farad
Description : SI unit of gain of amplifier is (a) Volt (b) ampere (c) coulomb (d) dimensionless
Last Answer : (d) dimensionless
Description : The unit Nm–2 is also called a) Coulomb b) Newton c) Pascal d) Ampere
Last Answer : c) Pascal
Description : A smallest three dimensional part of a crystal lattice is called. a) A particle b) A molecules c) A unit cell d) An atom
Last Answer : c) A unit cell
Description : The Si unit of mutual inductance and self inductance is: a.same b. different c. no unit d. a & b
Last Answer : b. different
Description : Energy stored per unit volume inside the solenoid is called: a. Energy density b. Charge Density c. Mass density d. Volume charge density
Last Answer : energy density is correct
Description : The unit of inductance is: a. Volt b. Ampere c. Henry d. Ohm
Last Answer : c. Henry
Description : The self-inductance of a long solenoid with a turns per unit length is: a. L = μ nA/ l b. L = μ n2 A/ l c. L = μ n2 A l d. L = μ n l/ A
Last Answer : d. L = μ n l/ A
Description : Which of the following does not equal the unit of magnetic flux density? a) 1 Wbm-2 b) 1 NA-1m -1 c) Both (a) and (b) d) 1 Wbm-1
Last Answer : d) 1 Wbm-1
Description : The force per unit charge is called: (a) Electric field (b) Electric field intensity (c) Electric potential energy (d) Electric potential
Last Answer : b) Electric field intensity
Description : The SI unit of charge is: (a) Meter (b) Ampere (c) Coulomb (d) Volt
Last Answer : (c) Coulomb
Description : The SI unit of charge is: (a) Coulomb (b) Calorie (c) Ampere (d) Joule
Last Answer : a) Coulomb
Description : The left hand rule correlates to (a) current, induced e.m.f. and direction of force on a conductor (b) magnetic field, electric field and direction of force on a conductor (c) self induction, ... and direction of force on a conductor (d) current, magnetic field and direction of force on a conductor
Last Answer : (d) current, magnetic field and direction of force on a conductor
Description : A typical nucleus is less than _____ in diameter. a) 1010 m b) 10-10 m c) 1014 m d) 10 -14 m
Last Answer : d) 10 -14 m
Description : The presence of anti-matter was predicted by a) P.A.M Dirac b) Anderson c) Einstein d) Chamberlain
Last Answer : a) P.A.M Dirac
Description : In transistor, the base region is of the order of _______ (a) 10-5 m (b) 10-2 m (c) 10-8 m (d) 10-6 m
Last Answer : d) 10-6 m
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 : The dimension of strain is a) [L] b) [ML2T –2 ] c) [M L–1 T –2 ] d) Dimensionless
Last Answer : d) Dimensionless
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 : One tesla equals a) 1 NA-1m -1 b) 1 NA-2m -3 c) 1NAm-1 d) 1NA-1 m
Last Answer : a) 1 NA-1m -1
Description : A proton having mass m and charge q is projected into a region having a perpendicular magnetic field. The angle of deviation of proton when it comes out of the region with mv √2 qB ⁄ is a) π/3 b) π/4 c) π/6 d) 2 π/3
Last Answer : b) π/4