(i) An emf can be induced by moving a conductor in a magnetic field.
(ii) An emf can be induced by changing the magnetic field.
(A) difference in thermal conductivity of water and soil.
(C) conduction between air and the soil.
(D) radiation from the soil.
(A) the center of the earth.
(B) the midpoint of the center and the surface of the earth.
(D) a height equal to the radius of the earth from the surface of the earth.
WBCS Main Question Paper – 2019
(A) Copernicus
(B) Einstein
(C) Rutherford
(D) Satyen Bose
(A) Infrared rays
(B) UV rays
(C) X-rays
(D) y-rays
(A) Polarimeter
(B) Planometer
(C) Psychrometer
(D) Photometer
(1885)
(A) Lyman, ultraviolet
(B) Lyman, visible
(C) Balmer, ultraviolet
(D) Balmer, visible
136.
A bullet on penetrating 30 cm into its target loses it’s velocity by 50%.What additional distance will it penetrate into the target before it comes to rest?
(A) 30 cm
(B) 20 cm
(C) 10 cm
(D) 5 cm
(A) Thermal conduction
(B) Forced convection
(C) Natural convection
(D) Thermal radiation
139. If the
band gap between valence band and conduction band in a material is 5.0eV, then the material is
(A) semiconductor
(B) good conductor
(C) super conductor
(D) insulator
(A) Planck’s constant and angular momentum
(B) Impulse and linear momentum
(C) Moment of inertia and moment of a force
(D) Energy and torque
143. Water is flowing through a very narrow tube.
The velocity of water below which the flow remains a streamline flow is known as
(A) relative velocity
(B) terminal velocity
(C) critical velocity
(D) particle velocity
(A) 37.5 W
(B) 25 W
(C) 12.5 W
(D) 10 W
(A) Buoyancy is equal to weight of body.
(B) Weight of liquid displaced by body is equal to buoyancy.
(C) Force applied by body on liquid is buoyancy downward.
(D) Weight will be greater than buoyancy.
(A) 100 dB
(B) 150 dB
(C) 200 dB
(D) 250 dB
(A) zero
(B) lesser
(C) equal
(D) greater
173.
For a metallic wire, the ratio
v/i [ v = applied potential difference and i = current flowing ] is
(A) independent of temperature.
(B) increases as the temperature rises.
(C) decreases as the temperature rises.
(D) increases or decreases as the temperature rises depending upon the metal.
(A) zero
(B) unity
(C) infinity
(D) more than that of a real fluid
(A) volume conservation
(B) mass conservation
(C) charge conservation
(D) energy conservation
(A) Venturimeter
(B) Pitot tube
(C) Orifice Meter
(D) None of the above
WBCS Main Question Paper – 2018
a) 2 times
b) 4 times
c) 6 times
d) 8 times
a) Schottky
b) Frankel
c) Interstitial
d) Electronic
a) Infrared and heat energy
b) Y -rays
c) UV-rays
d) X-rays
a) Volt
b) Watt
c) Coulomb
d) Ampere
a) Copper
b) Steel
c) Brass
d) All of the above
a) Ultrasonic
b) Supersonic
c) Microwave
d) Seismic
a) positive integer
b) negative integer
c) positive integral multiple of 1/2
d) any fraction
a) grip of legs with the floor surface minimizes
b) frictional force nil
c) centre of gravity of body changes
d) increase of forwarding forces
a) fundamental frequency
b) harmonics
c) amplitude of the wave
d) velocity of sound
a) 400 to 800 mm
b) 500 to 1000 mm
c) 300 to 600 mm
d) 200 to 400 mm
a) Transformer
b) Rectifier
c) Induction motor
d) Dynamo
a) increases with temperature.
b) decreases with temperature
c) does not change with temperature.
d) increases at lower temperature but decreases at higher temperature.
a) 21%
b) 22%
c) 24%
d) 25%
a) Bourdon pressure gauge
b) Hot filament ionisation gauge
c) McLeod gauge
d) Inclined tube manometer
a) zero
b) small
c) high
d) very high
a) continuous emission spectrum
b) band absorption spectrum.
c) line absorption spectrum
d) continuous absorption spectrum.
(A) ß-rays
(B) α-rays
(C) γ-rays
(D) X-rays
WBCS Main Question Paper – 2017
(A) Otto cycle
(B) Diesel cycle
(C) Carnot cycle
(D) Ranking cycle
(1798)
(A) Newton
(B) Cavendish
(C) Galileo
(D) None of the above
(A) Fractional force
(B) Centrifugal force
(C) Centripetal force
(D) Gravitational force
(A) Intensity of magnetization
(B) Permeability
(C) Magnetic flux
(D) Magnetic susceptibility
(A) 10-15 m
(B) 10-9 m
(C) 10-18 m
(D) 10-12 m
(A) 0°C
(B) 4°F
(C) 4 K
(D) 4°C
(A) 25 W bulb will fuse
(B) 100 W bulb will fuse
(C) None of these will fuse
(D) Both will fuse.
156. If the lengths and two diagonals of a rectangle are each increased by 6%, find % increase in its breadth.
(A) 5%
(B) 6%
(C) 7%
(D) 8%
(A) x axis : y axis
(B) Sinθ : Cosθ
(C) Length : Width
(D) None of the above
(A) the ratio of the cosine of the angles of incidence and refraction of light is constant when it passes between two given media.
(B) the ratio of the sine of the angles of refraction and incidence of light is constant when it passes between two given media.
(C) the ratio of the sine of the angles of incidence and refraction of light is constant when it passes between two given media.
(D) None of the above
(A) Optical glass
(B) Radiation shield glass
(C) Safety glass
(D) Toughened glass
(A) 2eV
(B) >2eV
(C) <2eV (0.7 eV)
(D) None of the above
(2.65 g/cc, 2.59 to 2.63 in impure varieties)
(A) 2.32 g/cc
(B) 2.63 g/cc
(C) 2.53 g/cc
(D) 2.2 g/cc
195. (Ni-Mn) ferrite is the example of material
(A) ferrimagnetic
(B) paramagnetic
(C) ferromagnetic
(D) None of the above
(A) Low hysteresis loss and low permeability
(B) High hysteresis loss and low permeability
(C) Large density and large retentively
(D) Low hysteresis loss and high permeability
(A) Steady currents
(B) Currents impulses
(C) Earth’s magnetic field
(D) None of the above
(A) Positive charge
(B) both as positive and negative charge
(C) the electric field between the plates
(D) the potential energy of the capacitor plates
(A) the Sun
(B) mercury vapour lamp
(C) candle
(D) electric bulb
WBCS Main Question Paper – 2016
(A) amplifier
(B) filter
(C) oscillator
(D) full wave rectifier
(A) Blue light
(B) Green light
(C) Red light
(D) Yellow light
(A) astigmatism
(B) myopia
(C) hypermetropia
(D) pres biopia
(A) light yellow
(B) orange
(C) blue
(D) black
(A) Electrons and other elementary particles
(B) Structure of bacteria and viruses
(C) Inside of human stomach
(D) Inside of the human eye
(A) scattering
(B) diffraction
(C) interference
(D) dispersion
(50 Hz)
(A) Voltage
(B) Current
(C) Frequency
(D) Power
(A) Sodium oxide and argon
(B) Sodium vapour and neon
(C) Mercury vapour and argon
(D) Mercury oxide and neon
(Color temperature)
(A) 220 K
(B) 275 K
(C) 6500 K
(D) 9000 K
(A) rubber is a good conductor
(B) rubber is an insulator
(C) it is easy to work while wearing gloves
(D) None of the above
(A) Fountain pen
(B) Ball point pen
(C) Gel pen
(D) Both ball point and gel pens
(3.26156 light year)
(A) brightness of heavenly bodies
(B) density of the earth
(C) orbital velocity of the stars
(D) astronomical distance
(from radium in 1900)
(A) Paul Villard
(B) Marie Curie
(C) J. J. Thompson
(D) Adam Osborne
27. Confirmation of the presence of Higgs Boson will justify –
(A) both the standard model and superstring theory
(B) the unification of all the four fundamental forces
(C) the steady state model of the universe
(D) the mass of the fundamental particles
29. When red glass is heated in dark room it will seem –
(A) green
(B) purple
(C) black
(D) yellow
(A) fall
(B) rise
(C) remain the same
(D) None of these
(A) at Shimla
(B) at Mt. Everest
(C) at the sea level
(D) None of these
(A) quantum theory
(B) general theory of relativity
(C) field theory of relativity
(D) special theory of relativity
(A) Hertz(Germany)
(B) Romar
(C) Marconi
(D) Maxwell
(A) photovoltaic cell
(B) conductivity cell
(C) standard hydrogen electrode
(D) None of these
57. Fat can be separated from milk in a cream separator because of
(A) cohesive force
(B) gravitational force
(C) centripetal force
(D) centrifugal force
(Equator – increases, Poles – unchanged)
(A) Increases
(B) decreases
(C) remain unchanged
(D) becomes zero
(A) relative temperature
(B) absolute temperature
(C) specific temperature
(D) approximate temperature
(A) absence of inertia
(B) absence of accelerating force
(C) absence of gravity
(D) free fall of the spaceship
(A) equal to that of electrolytic cell
(B) smaller than that of electrolytic cell
(C) higher than that of electrolytic cell
(D) zero
(A) Blackboard
(B) Kajol
(C) A pin hole box
(D) None of the above
(Roentgen equivalent man)
(A) radiation dosage
(B) binding energy
(C) packing fraction
(D) radioactivity
(A) increases
(B) decrease
(C) remains constant
(D) either increases or decreases
(A) the small drop moves faster
(B) the large drop moves faster
(C) both moves with same speed
(D) None of the above
(A) its kinetic energy increases
(B) its total energy increases
(C) its total kinetic energy decreases
(D) None of these
(A) Jet engine
(B) Tea placed in steel kettle
(C) Pressure cooker
(D) Rocket engine during propulsion
(albedo)
(A) sand radiate heat more quickly than the earth
(B) the sky remains clear most of the time
(C) sand absorbs heat quickly than the earth
(D) None of the above
(A) Simple barometer
(B) Fortin’s barometer
(C) Manometer
(D) Aneroid barometer
(A) high frequency absorption
(B) low temperature emission
(C) doppler effect
(D) unknown phenomenon
(A) Convection
(B) Conduction only
(C) Radiation only
(D) Both conduction and radiation
WBCS Main Question Paper – 2015
(A) Dust Particles
(B) Carbon dioxide
(C) Helium
(D) Water Vapour
2. A weightless rubber balloon is filled with 200c.c. of water. Its weight in water is equal to
(A) 9.8/5 N
(B) 9.8/10 N
(C) 9.8/2 N
(D) Zero
(1st Law of motion)
(A) Driving force in the direction of motion of the car
(B) Resistance force in the direction opposite to car’s motion
(C) An inclined force
(D) Equal to Zero
7.
Rainbow is produced when sunlight falls on drop of rain. The physical phenomena responsible for this are
1) Dispersion
2) Refraction
3) Internal reflection
(A) 1 & 2
(B) 2 & 3
(C) 1 & 3
(D) All of the above
(A) First submarine (1775)
(B) Hovercraft
(C) Steamship
(D) Catamaron
45. Which one of the following is printed on a commonly used fluorescent tube light?
(A) 220 K
(B) 273 K
(C) 6500 K
(D) 9000 k
(A) Max Planck
(B) Albert Einstein
(C) William Henry Bragg (1915)
(D) Enrico Fermi
(Raman effect – light scattering)
(A) 1920
(B) 1925
(C) 1930
(D) 1931
92. A sample of gas expands from volume V1
to V2. The amount of
work done by gas is greatest when the expansion is
(A) Adiabatic
(B) Equal in all cases
(C) Isothermal
(D) Isobaric
(A) Scattering
(B) Dispersion
(C) Reflection
(D) Refraction
(A) Potential difference
(B) Charge
(C) Energy
(D) Power
(A) Power
(B) Wavelength
(C) Intensity
(D) Frequency
(A) Steps up the line voltage
(B) Steps down the line voltage
(C) Reduces the current in the circuit
(D) Chekes low frequency current
(A) Very small size
(B) Very large size
(C) Very high density
(B) Very Very low size
(A) Increase by 0.5%
(B) Increase by 2.0%
(C) Decrease by 0.5%
(D) Decrease by 2.0%
(A) red, yellow green
(B) Red, yellow, Blue
(C) Red, Green, Blue
(D) Yellow, Green, Blue
WBCS Main Question Paper – 2014
(A) Momentum
(B) Energy
(C) Angular Momentum
(D) Power
11. The wave length of visible light lies between
(about 380 to 740 nanometers)
(A) 200 – 400 nm.
(B) 400 – 700 nm.
(C) 700 – 1000 nm.
(D) 1000- 2000 nm.