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Online Tests
Physics ECAT Pre Engineering Online Test MCQs With Answers
Question # 1
The conventional current is the name given to current due to flow of
Choose an answer
Positrons
Positive charges
Negative charges
Both A and C
None of these
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Question # 2
In a container having water filled up to a height h, a hole is made in the bottom. The velocity of water flowing out of the hole is
Choose an answer
Independent of h
Proportional to h
1/2
Proportional to h
Proportional to h
2
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Question # 3
First law of thermodynamic is special case of
Choose an answer
Law of conservation of energy
Charle's law
Law of conservation of mass
Boyle's law
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Question # 4
For the normal operation of the transistor, its
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emitter-base and collector base junctions are forward biased
emitter-base junction is reversed biased and collector base junction is forward biased
emitter-base junction is forward biased and collector-base junction is reverse biased
any one of these
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Question # 5
The magnitude of resultant of three vectors is 3. Its x-component is one, y-component is two, then its z-component is:
Choose an answer
0
1
2
3
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Question # 6
To sources are said to be coherent if they have:
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Same amplitude
Same wavelength
Definite phase relation with each other
None of them
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Question # 7
When a shall explodes a mid-air, the total momentum of its fragments is
Choose an answer
less than the momentum of shell
equal to the momentum of shell
greater than the momentum of shell
none of them
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Question # 8
In the formula P = N
0
KT, N
0
denotes:
Choose an answer
Number of molecules per unit per volume
Number of moles
Number of molecules
None of these
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Question # 9
The contrast in the fringes in an interference pattern depends upon
Choose an answer
Fringe width
Relative difference intensities of the two sources
Distance between the slits
Wavelength
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Question # 10
Every crystalline solid has
Choose an answer
definite melting point
different melting points
may or may not be definite
none of them
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Question # 11
A force of 5 n is acting Y-axis. Its component along X-axis is:
Choose an answer
7 N
5 N
Zero
10 N
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Question # 12
The range of particle depends upon the factor
Choose an answer
charge, mass and energy of particle
density of medium
ionization potential of the atoms
all the above
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Question # 13
The passage of current is accompanied by a magnetic field in the surrounding space:
Choose an answer
Always accompanied
Sometimes accompanied
Never accompanied
Any of above
None of these
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Question # 14
Eddy current is produced when:
Choose an answer
A metal is kept in varying magnetic field
A metal is kept in steady magnetic field
A circular coil is placed in a steady magnetic field
A current is passed through a circular coil
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Question # 15
The inkjet printer eject a thin stream of:
Choose an answer
Water
Oil
Ink
Any above
None of these
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Question # 16
Referring to above figure, due to change in current in the coil P, the change in magnetic flux
Choose an answer
Is associated with coil P
Is associated with coil S
Causes and induced current in coil S
All of these
None of these
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Question # 17
At higher frequency of the alternating current, the capacitive reactance X
c
Choose an answer
Increases
Decreases
Remains the same
Increases only when the voltage increases
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Question # 18
A medium of dielectric constant 'K' is introduced between the plates of parallel plate condenser. As a result its capcitance
Choose an answer
Increase k time
Decreases k times
Decreases 1/K times
Remains unchanged
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Question # 19
Which waves are used in sonography?
Choose an answer
Microwaves
Infra red waved
Sound waves
Ultrasonic waves
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Question # 20
If the value of C in a series RLC circuit is increased, the resonant frequency
Choose an answer
Is not affected
Increase
Remains the same
Decreases
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Question # 21
The positron was discovered by:
Choose an answer
In cosmic radiation
In 1932
By Carl Anderson
All above
By direc
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Question # 22
The impedance of RLC series resonance circuit at resonant frequency is
Choose an answer
Greater than R
Equal to R
Less than R
None of these
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Question # 23
Aerodynamics is a branch of
Choose an answer
Hydrodynamics
Thermodynamics
Both of them
Statics
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Question # 24
The statement "the electric force of repulsion or attraction between two point charges is directly proportional to the product of the charges and inversely proportional to square of the distance between them" refer to
Choose an answer
Coulomb's law
Gauss's law
Biot-Sarwat law
Ampere's law
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Question # 25
Graph of Black body radiation is example of
Choose an answer
Band spectra
Continuo's spectra
Line spectra
All
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Question # 26
Physicist George Simon ohm was a
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German physical
French physicist
Chinese physicist
Russian physicist
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Question # 27
In the theory of dimensional analysis, heat may be properly represented by:
Choose an answer
ML
2
T
-2
MT
-2
ML
-1
T
-1
None of these
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Question # 28
A diode characteristic curve is a plot between
Choose an answer
current and time
voltage and time
voltage and current
forward voltage and reversed voltage
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Question # 29
The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is
Choose an answer
100 ev
10
6
e v
10
3
e v
1.0 e v
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Question # 30
Nowadays, Most of the electric energy is produced by the A.C. generators using:
Choose an answer
Hydal water
Geothermal energy
Solar energy
Biomass
Both (B) and (D)
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Question # 31
In a cubic crystal, All solids meet at:
Choose an answer
60
o
90
o
109
o
30
o
10
o
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