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SSC PRASAR BHARTI EXAMINATION

Engineering Assistant

Model Solved Practice Papers

Q.1.Which one of the following physical quantities, is not defined in the terms of force per unit area:

• pressure
• strain
• stress
• Young’s modulus

Q.2.The distance moved by a moving body is equal to:

• area between the distance-time graph and distance axis
• area between the speed-time graph and time axis
• area between the distance-time graph and time axis
• area between the speed-time graph and distance axis.

Q.3.A beaker containing water weighs 100 gm. It is placed on >the pan of a balance and a piece of metal weighing 70 gm. and having a volume of 10cc. is placed inside the water in the beaker. The weight of the beaker and the metal would be :

• 170gm.
• 100gm.
• 160gm.
• 30gm.

Q.4.For the same kinetic energy, the momentum shall be maximum for:

• electron
• proton
• deuteron
• alpha particle

Q.5.The maximum value of g is:

• At the poles
• At the top of the Mount Everest
• At the equator
• Below the sea level

Q.6.The common balance works on the principle of equality of:

• forces
• moments of forces
• masses
• masses of pans

Q.7.A body of mass 2 kg acted upon by a constant force, travels a distance of 3 meters in the first second and a further distance of meter in the next second. The force acting on the body is?

• 12 Newtons
• 8 Newtons
• 4 Newtons
• 1 Newton

Q.8.A particle moves in a circle of radius R with a constant speed under a centripetal force F. The work done in completing a full circle is:

• 2RF
• 1/2RF
• 2/RF
• Zero

Q.9.When two quantities are plotted on the graph paper against each other and the result so obtained is a st. line, then

• Both the quantities are equal
• The quantities are inversely proportional to each other
• Sum of both is zero
• The quantities are proportional to each other

Q.10.What is the order of magnitude of 260°?

• 103
• 104
• 102
• 10

Q.11.A fixed volume of gas at 27°C exerts a pressure of 750 mm. If the gas is heated to a pressure of 1500mm., temperature must be:

• 600°C
• 327°C
• 54°C
• 13.5°C

Q.12.A sharp knife cuts much better than a blunt one because?

• Area of sharp knife is much less than the area of the blunt one
• sharp knife is brighter
• sharp knife is colder
• sharp knife is costly

Q.13.Two forces each equal to P acting at a point have no resultant. The angle between the two forces must be equal to:

• 180°
• 90°
• 0°
• 120°

Q.14.A device for measuring temperatures at a distance is

• gas thermometer
• mercury thermometer
• radiation
• maximum-minimum thermometer

Q.15.A jet engine works on the principle of:

• conservation of energy
• conservation of momentum
• conservation of mass 
• conservation of temperature

Q.16.A black body emits:

• radiations of all wavelengths
• no radiations
• radiations of only one wavelength
• radiations of selected wavelengths

Q.17.A man carries a heavy box on his head on a horizontal plane from one place to another. In this he does?

• maximum work
• no work
• negative work
• minimum work

Q.18.In isothermal expansion of an ideal gas:

• heat content remains constant
• temperature remains constant
• both heat content and temperature remain constant
• pressure and temperature of the gas remain constant

Q.17.The bob of a second’s pendulum is replaced by another bob of double mass. The new time period will be:

• 4 sec.
• 2 sec.
• 1 sec
• 3 sec.

Q.18.Size of a nucleus is of the order of?

• 10-18m
• 10-14m
• 10-10m
• 10-6m

Q.19.The ratio of the specific heat of air at constant pressure to its specific heat at constant volume is?

• zero
• greater than one
• less than one
• equal to one

Q.20.In a resonance tube experiment the first resonance is obtained for 10 cm. of air column and the second for 32 cm. The end correction for this apparatus is equal to?

• 0.5 cm
• 1.0 cm
• 1.5 cm
• 2 cm

Q.21.A piece of ice is floating in a concentrated solution of common salt (in water) in a pot. When ice melts completely, the level of solution will:

• go up
• remain the same
• go down
• first go up then go down

Q.22.A radioactive source has a half-life of 30 days. During a period of 90 days the fraction of atoms that have decayed would be

• 100%
• 87.5%
• 64%
• 50%

Q.23.Two particles having charges q1 and q2 when kept at a certain distance exert a force F on each other. If the distance between the two particles is reduced to half and the charge on each particle is doubled the force between the particles would be ?

• 2F
• 4F
• 8F
• 16F

Q.24.A near sighted person cannot see distinctly beyond 50 cm. from his eye.The power in diopter of spectacle lenses which will enable him to see distant objects clearly is

• +50
• —50
• +2
• —2

Q.25.The freezing point on a thermometer is marked as 20° and the boiling point as 150°C. A temperature of 60°C on this thermometer will be read as:

• 40°
• 65°
• 98°
• 110°

Q.26.A hollow metallic sphere is charged. Inside the sphere?

• the potential is zero but the electric field is finite
• the electric field is zero but the potential is finite
• both the electric field and the potential are finite
• both the electric field and the potential are zero

Q.27.A man standing between two cliffs hears the first echo of a sound after 2 sec. and the second echo 3 sec. after the initial sound.If the speed of sound be 330 m/sec. the distance between the two cliffs should be

• 1650 m.
• 990 m.
• 825 m
• 660 m.0

Q.28.Transistor act as a?

• conductor
• semi-conductor
• insulator
• thermionic valve

Q.29.Sonar is a device for:

• location and ranging of aircraft’s
• Location and ranging submarines
• producing a musical note of high quality
• measuring frequency of musical notes

Q.30.A convex lens has a focal length of 10 cm. When it is immersed in water it will behave as?

• a convex tens of 10 cm. focal length
• a concave lens of 10 cm. focal length
• a convex lens of focal length greater than 10cm.
• a convex lens of focal length less than 10 cm.

Q.31.A small magnet is placed perpendicular to a constant magnetic field. The forces acting on the magnet will result in?

• rotation
• translation
• no motion at all
• rotation as well as translation

Q.32.Two electric lamps each of 100 watts 220 V are connected in series to a supply of 220 volts. The power consumed would be:

• 100 Watts
• 200 Watts
• 25 Watts
• 50 Watts

Q.33.Cyclotron is a device to produce:

• atomic energy
• high energy electrons
• high energy photons
• high energy protons

Q.34.A transformer is:

• a device for stepping up D.C.
• a generator of current
• device for converting direct current into alternating current
• a device for stepping up or down the voltage of A.C. supply

Q.35.Two steel balls of mass 1 kg. and 2kg. and a lead ball of 10kg. are released together from the top of tower 30 metres high. Assuming the path to be in vacuum

• the lead ball reaches the ground earlier
• the 1 kg. steel bail reaches the ground earlier
• all the balls reach the ground simultaneously
• the 2 kg. steel ball reaches the ground earlier

Q.36.The electric field inside a hollow conducting sphere will ?

• increases towards the centre
• decreases towards the centre
• is finite and constant throughout
• is zero

Q.37.The sky is blue because:

• there is more blue light in the sunlight
• of scattering of sunlight by air molecules in the atmosphere
• of scattering of sunlight by dust particles in the atmosphere
• other colors are absorbed by heavenly bodies

Q.38.Magnetic storms are due to

• the rotation of the earth
• the revolution of the earth
• the rainy season
• the appearance off Sun spots

Q.39.A cyclonic storm is indicated by a change in the atmospheric pressure.In atmospheric pressure there is a:

• sudden rise
• gradual rise
• sudden fall
• gradual fall

Q.40.Imperfect gases are those:

• which contain impurities
• which do not obey Charle’s and Boyle’s laws
• whose molecules are not spherical
• whose molecules cannot be regarded as point masses

Q.41.Which one of the following is not a vector?

• Velocity
• Acceleration
• Force
• Energy

Q.42.In which of the following cases total internal reflection cannot be obtained?

• ray going from water to glass
• a ray going from glass to water
• a ray going from glass to air
• a ray going from water to air.

Q.43.After a watch has been wound, it?

• has great energy stored in it
• possesses mechanical potential energy stored in it
• has electrical energy stored in it
• has no energy in it

Q.44.For dynamo which one of the following statements is correct ?

• It converts the electrical energy into light energy
• It converts the kinetic energy into heat energy
• It converts the mechanical energy into electrical energy
• Jt converts the electrical energy into mechanical energy.

Q.45.Two plane mirrors are set at right angles and a flower is placed in any position in between the mirrors. The number of images of the flower which will be seen is?

• two
• four
• one
• three

Q.46.A dynamo actually acts as a?

• converter of energy
• source of electric charge
• source of magnetic charge
• source of energy

Q.47.When white light passes through a glass prism, we get a spectrum on the other side of the prism. In the emergent beam the ray which is deviated least is

• the violet ray
• the red ray
• the green ray
• the yellow ray

Q.48.In a transformer the immediate cause of the induced A. C. in the secondary coil is?

• a varying electric field
• a varying magnetic field
• a motion of the secondary coil
• efficiency of the operator

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