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Home
Questions & Answer
Science Questions & Answers
Physics Questions & Answers
Physics Questions & Answers
(Compiled from UPSC, SSC ,PSC ,IBPS previous question papers)
Frequency density corresponding to a class interval is the ratio of
A
Class frequency to the frequency
B
Class frequency to the class length
C
Class length to the class frequency
D
Class frequency to the cumulative frequency
The upper limit of classes intervals is required when we consider the formations of
A
Relative frequency
B
More than cummulative frequency
C
Less than cummulative frequency
D
Class frequency
A car accelerates on a horizontal road due to the force exerted by
A
The engine of the car
B
The driver of the car
C
The earth
D
The road
The area under the force - displacement curve gives
A
Work done
B
Energy
C
Impulse
D
Momentum
In which of the following pairs of temperature scales the size of the degree is identical ?
A
Mercury scale and Ideal gas scale
B
Celsius scale and Mercury scale
C
Celsius scale and Ideal gas scale
D
Ideal gas scale and Absolute scale
In the diesel engine, engine power and speed are controlled by
A
The position throttle valve
B
The amount of air taken into the cylinders
C
The amount of fuel sprayed into the cylinders
D
The amount of air-fuel mixture the cairburetor delivers
The spray cone angle in pintle nozzle is generally
A
15°
B
30°
C
45°
D
60°
The specific gravity of diesel is
A
0.50
B
0.75
C
0.85
D
0.90
Gas lighterrs work on the bsic principle of
A
Piezo electric effect
B
Magnetic effect
C
Therme electric effect
D
Electromagnetic induction
In the extraction of iron from its Haematite ore, the flux added aid gangue formed respectively are
A
Oxygen, iron oxide
B
Carbondioxide, iron carbonate
C
Silica, iron silicate
D
Sulphur dioxide, iron sulphate
The property of attraction or repulsion between charged bodies is used in
A
A.C. Generator
B
Electrostatic paint spraying
C
Potentiometer
D
Metre Bridge
The Velocity of Sound is
A
Mininum in the rod C
B
Minimum in both the rode A and B
C
The same in all the rods
The dimensions of the ratio of density to the modulus of electricty are
A
L²T-²
B
L-²T-²
C
LT-¹
D
L-¹T
Energy flow in an eco system is
A
Unidirectional
B
Multidirectional
C
Bidirectional
D
No directional
A rocket 100 m long at rest starts to move with uniform motion of 0.8 C. What is its length as seen by an observer at rest
A
60 cm
B
80 cm
C
100 cm
D
0
The deviation of the charge distribution of a nucleus from spherical symmetry can be estimated by measuring its
A
Electric charge
B
Electric dipole moment
C
Magnetic dipole moment
D
Elevtric quadrupole moment
In an election 30 PERC of the voters voted for candidate A where as 60 PERC of the remaining voted for candidate B. The remaining voters did not vote. If the difference between those who voted for candidate A and those who did not vote was 1200, how many were eligible for casting vote in that election
A
40,000
B
50,000
C
60,000
D
6,000
In an electro chemical cell, there is the conversion of :
A
Electrical energy into chemical energy
B
Chemical energy into electrical energy
C
Chemical energy into heat energy
D
Mechanical energy into heat energy
The distance of stars from earth is expressed generally interms of
A
Metre
B
Kilometer
C
Astronomical unit
D
Light year
Which of the following is not a physical change
A
Boiling of water to give watervapour
B
Melting of ice to give liquid water
C
Dissolution of salt in water
D
Combustion of Liquefied Petroleum Gas (LPG)
The ability of metal to be drawn into thin wires is known as
A
Ductility
B
Malleability
C
Sonorosity
D
Conductivity
What is the maximum resistance which can be made using five resistors each of 1/5 ?
A
1/5 ?
B
10 ?
C
5 ?
D
1 ?
Which of the following is not a natural resource
A
Soil
B
Water
C
Electricity
D
Air
Red light is used for danger signal as
A
It has higher wavelength
B
It can travel large distance
C
It scatters the least
D
It scatters the longest
The function of heavy water in a nuclear reactor is to
A
Slow down the speed of neutrons
B
Increase the speed of neutrons
C
Cool down the reactor
D
Stop the nuclear reaction
The velocity at which the flow changes from laminar to turbulent for the case of a given liquid at a given temperature and in a given pipe, is known as :
A
Turbulence velocity
B
Critical velocity
C
Reynolds velocity
D
Froude velocity
What is the SI unit of absolute permittivity of a medium ?
A
J/C
B
C2/(Nm2)
C
C2/(Nm)
D
(Nm)/C2
Which of the following is a cycle consisting of one constant pressure, one constant volume and two isentropic processes ?
A
Carnot cycle
B
Stirling cycle
C
Otto cycle
D
Diesel cycle
The curve traced by ,1 point moving on a plane in one direction, towards a fixed point while also moving around that point is called ?
A
Trochoid
B
Spiral
C
Parabola
D
Catenary
In amplitude modulation :
A
Carrier frequency is changed
B
Carrier amplitude is changed
C
Three sidebands are produced
D
Fidelity is improved
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